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LASER TECHNOLOGY L IVE – AKL’16

AKL’16 – THURSDAY, APRIL 28, 2016

TIME: 16.30 h - 19.30 h

LOCATION: AT FRAUNHOFER ILT

AND APPLICATION CENTER

WWW.LASERCONGRESS.ORG

liveLASER TECHNOLOGY

Content

Floor Plan Presentation Overview 1

Fraunhofer ILT Short Profile 3Chamber of Industry & Commerce IHK Aachen 3Arbeitskreis Lasertechnik AKL e.V. 4 European Laser Institute ELI e.V 4

Presentations by Topics - Excellence Networks 5- Special Exhibit 7 - Additive Manufacturing 8- Generative Methods 13- Surface Treatment 15- Cutting 20- Joining 23- Drilling 30- Micro Technology 31- Modeling and Simulation 35- System Technology 36- EUV and Plasma Technology 39- Laser and Laser Optics 40- Life Science 50

Publishing Notes 50

LASER TECHNOLOGY LIVE

BOOTH PLANGROUND FLOOR

BASEMENT

Additive Manufacturing

Generative Methods

Surface Treatment

Cutting

Central Information | Excellence Networks | Special Exhibit

Joining

Drilling

Micro Technology

Modeling and Simulation

System Technology

EUV and Plasma Technology

Laser and Laser Optics

Life Science

OVERVIEWPRESENTATIONS


Page Topic Short Description Location Booth3 Central Information Fraunhofer Institute for Laser Technology ILT Entrance 13 Central Information IHK Aachen Entrance 2a4 Central Information AKL e.V. – Aix Laser People Entrance 2b 4 Central Information European Laser Institute – ELI e.V. Entrance 2c5 Excellence Networks Aachen Center for Additive Manufacturing – ACAM Entrance 2d5 Excellence Networks Lab of the Future: FabBus Takes 3D Printing Directly In front of 2e to Schools and Companies Main Entrance 6 Excellence Networks New Low Cost SLM System In front of 2f Main Entrance 7 Special Exhibit Upper Stage Engines of Future Ariane 6 Entrance 3a7 Special Exhibit “LIGHT” Photonics Cluster 3b8 Additive Manufacturing Inner Processing Optics and Powder Feed Nozzles E100.C10 48 Additive Manufacturing A Joint Approach in Additive Manufacturing of Nickel-Base Superalloys for Turbomachinery Applications E100.C12 6a9 Additive Manufacturing Design Center Additive Manufacturing E100.C12 6b9 Additive Manufacturing Laser Powder Bed Fusion of Special Materials E100.A13 11c10 Additive Manufacturing Additive Manufacturing by Laser Metal Deposition E100.B12 1310 Additive Manufacturing New System Technology Components E100.A10 14 for Laser Metal Deposition 11 Additive Manufacturing Cladding Head with Coaxial Wire Feeding E100.A09 15a for Laser Metal Deposition (LMD) 11 Additive Manufacturing 3D Photopolymerization E321 3612 AdditiveManufacturing LMD,it´sOfflinePlanningandSimulationonaSixAxis E100.A04 44a Industrial Robot System by Using LMDCAM Software 12 Additive Manufacturing Multi-Purpose Head for Laser Welding and LMD E100.A05 4513 Generative Methods Micro SLM (Selective Laser Melting) E100.A15 913 Generative Methods Fabrication of Micro Structures E100.A14 10 via µSLM- and Modulated Laser Radiation 14 Generative Methods Aconity3D E100.A13 11a14 Generative Methods Post Processing of SLM Parts E100.A12 1215 Generative Methods 3D Laser Cladding with Automated Generation Main Hall 16 of Welding Paths 15 Surface Treatment Wear and Corrosion Protection with High Speed E100.C11 5 Laser Material Deposition 16 Surface Treatment High Speed Surface Treatment with Polygon Scanners E100.C13.1 716 Surface Treatment Micro Laser Cladding in Dimensions below 100µm: E100.B09 15b Dots, Lines and Large Areas 17 SurfaceTreatment Resource-EfficientInlineProcessingofAu-Layers E107 22a for Mass Production 17 Surface Treatment Laser-Based Production of Polymeric E107 22b Corrosion Protection Coatings 18 Surface Treatment Surface Functionalization by VSCEL Technology E313 3718 Surface Treatment Local Laser Heat Treatment of Ultra High Strength Steels E100.A06 4619 Surface Treatment Laser Polishing of Metals U120.1 51a19 Surface Treatment Manufacturing of Glass Optics by Laser Ablation U120.1 51b and Laser Polishing 20 Cutting Cutting of Fiber-Reinforced Plastics E100.C02 3220 Cutting In-Situ Diagnostics System for Laser Cutting E310 3921/27 Cutting / Joining Practical Solutions for Laser Cutting and Welding E100.A04 44c in Sheet Metal Applications 21 Cutting TheInfluenceofLaserBeamShapingontheProcess E100.B06 47a Stability and Quality in Laser Fusion Cutting 22/27 Cutting / Joining High Speed Cutting and Welding E100.B06 47b22/28 Cutting / Joining Laser Processing Heads for Cutting and Welding Hall West 4823 Joining Laser Welding of Copper and Steel for Battery Modules E032 25a23 Joining Scanner Welding of Prismatic Battery Contacts E032 25b with Disk Lasers 24 Joining Technology Demonstrating Part – Laser E030 26 in Polymer Processing 24 Joining Laser Thermography Testing for CFRP E317 34g25 Joining Laser Impulse Metal Bonding (LIMBO) E310 38a25 Joining Laser Ribbon Bonding for Power Electronics E310 38b26 Joining Process Monitoring in Laser Plastics Welding E310 38c26 Joining The Materials Laboratory E100.A04 44b

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LASER TECHNOLOGY L IVE – AKL’16LASER TECHNOLOGY L IVE – AKL’16

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Fraunhofer Institute for Laser Technolgy ILT Withmorethan400employeesandmorethan19,500m²netfloorspacetheFraunhofer Institute for Laser Technology ILT is worldwide one of the most important developmentandcontractresearchinstitutesofitsspecificfield.Theactivitiescovera wide range of areas such as the development of new laser beam sources and compo-nents, precise laser based metrology, testing technology and industrial laser processes. This includes laser cutting, caving, drilling, welding and soldering as well as surface treatment, micro processing and rapid manufacturing. Furthermore, the Fraunhofer ILT is engaged in laser plant technology, process control, modelling and simulation as well as in the entire system technology. We offer feasibility studies,processqualificationandlaserintegrationincustomerspecificmanufacturinglines. The Fraunhofer ILT is part of the Fraunhofer-Gesellschaft, with 66 institutes, 24,000 employees and an annual research budget of more than 2 billion euros.

Contact PersonDipl.-Phys. Axel BauerPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 1Entrance

CENTRAL INFORMATION

Chamber of Industry and Commerce Aachen (IHK Aachen) As the representative organization for companies, IHK Aachen is the political stake-holder, mediator and advocate for the local business community of 70,000 companies in the Aachen region. As a customer-focused provider of services to the business community, we offer pre-market services for new and established companies. As a political stakeholder, we are strong advocates for a market-based legislative and regulatory environment which is conducive to small and medium-size enterprises. As independent arbitrators, we support fair business practices. We offer networking and initiate cooperation between science and business respectively betweencompanies.Forthatweofferawiderangeofconsultingservicestofindtheright partner for your research and development needs.

Our mission: we work for our members and for the success of their businesses.

Contact Person IHK AachenDept. Innovation, Environment and IndustryPhone +49 241 [email protected]

BOOTH 2aEntrance

CENTRAL INFORMATION

Page Topic Short Description Location Booth 28 Joining Application of Hybrid Laser Beam Welding E100.B07 50a to Joining of Excavator Booms 29 Joining Welding of LMD-Produced 2.4682 E100.B07 50b and Wrought 2.4630 Dissimilar Joints 29 Joining Laser Beam Welding of Ultra-High Strength E100.B07 50c Dissimilar Welds 30 Drilling Laser Drilling of CFRP Preforms E160.3 29 for Force Transmission Elements 30 Drilling Helical Drilling of High-Precision Micron U102.1 52a Scaled Holes Using Ultra-Fast Laser Pulses 31 Micro Technology Micro Scanners for Selective Laser-Induced Etching (SLE) E110 21a31 Micro Technology LightFab E110 21b32 Micro Technology Texturing of Moulding Tool Surfaces E160.1 28a32 Micro Technology Ablation of Transparent Materials with Ultra-Fast Lasers E160.1 28b33 Micro Technology Deep-Engraving and Texturing of Large Scale E100.A02 30 Moulding Tools 33 Micro Technology Glass Frit Sealing by Laser Radiation E100.A07 4934 Micro Technology Roll-to-Roll Laser Patterning of Thin Functional Films U102.1 52b34 Micro Technology High-Throughput Diffractive Optics U102.1 52c for USP Laser Processing 35 Modeling and Simulation Numerical Modeling and Simulation of Pulsed Laser Hall West 17 Applications like Fine-Cutting, Ablation and Drilling 35 Modeling and Simulation Simulation of Laser Cutting and Welding Main Hall 31a36 Modeling and Simulation High-Power Adaptable Laser Beams “HALO” Main Hall 31b36 System Technology Process Monitoring for 3D Printing by SLM E100.A13 11b37 System Technology Machine and Beam Shaping Technology Hall West 18 for Laser Micro Processing 37 System Technology Multi-MHz Ultra-Fast Laser Processing E112.3 2038 SystemTechnology PowderNozzleCertification MainHall 33a38 System Technology Fully Integrated Quality-Control-System E327 35 for Laser Brazing Applications 39 System Technology Process Observation in CO

2 Laser Beam Cutting E100.B05 4339 EUVandPlasmaTechnology MaterialIdentificationwithLaser-InducedBreakdown E100.C15 8 Spectroscopy – LIBS40 EUV and Plasma Technology Compact Tunable Plasma-Based EUV Sources and their Applications in Nano Science and Spectroscopy Hall East 2340 Laser and Laser Optics Inverse Laser Drilling: High Aspect Ratio E103.2 19 Micro Structuring of Dielectrical Materials41 Laser and Laser Optics An Automated Setup for Measuring E053 24a Laser-Induced Damage Thresholds41 Laser and Laser Optics Pulse Energy Scaled Single Frequency Laser E053 24b for Future Lidar Applications 42 Laser and Laser Optics 2-µm Laser Beam Source Developments E053 24c42 Laser and Laser Optics Modular Innoslab Platform E053 24d43 Laser and Laser Optics Customized Electronics and Drivers for Laser Applications Main Hall 33b43 Laser and Laser Optics Dense Wavelength Multiplexing and 35 µm Fiber Coupling E317 34a44 Laser and Laser Optics Freeform Optical Surfaces as Major Building Block E317 34b of State-of-the-Art Lighting Systems 44 Laser and Laser Optics Automated Assembly of Optical Systems E317 34c45 LaserandLaserOptics ApplicationSpecificBeamProfiles:Tailoring E317 34d the Induced Temperature Field 45 Laser and Laser Optics Fused Fiber Couplers for High-Power Diode Lasers E317 34e46 Laser and Laser Optics Thermo-Optical Modeling of Optics E317 34f for High-Power Applications 46 Laser and Laser Optics Lenses Made of Synthetics Monocrystalline Diamond E317 34h for High-Power Laser Optics47 Laser and Laser Optics High-Power VSCEL Sources for Industrial Heat Processing E302 4047 Laser and Laser Optics 1.5 kW Femtosecond Laser System E311 4148 LaserandLaserOptics High-StabilitySingle-FrequencyYbFiberAmplifier E316 42a for Next Generation Gravity Missions 48 Laser and Laser Optics Key Optical Components for Rugged Laser Systems E316 42b49 Laser and Laser Optics Lasers and Frequency Converters with E316 42c Customized Wavelengths from UV to MIR 49 Laser and Laser Optics Flexible Assembly Cell for Optical Systems E316 42d50 Life Science LIFTSYS – Laser-Induced-Forward-Transfer of Cells E055.2 27

OVERVIEW PRESENTATIONS


54

Aachen Center for Additive Manufacturing – ACAM The ACAM is a joint initiative of the Fraunhofer ILT together with the Fraunhofer IPT, the RWTH Aachen University, the Aachen University of Applied Science and Spin-off companies located on the RWTH Campus. ACAM offers you access to innovative know-how, training and education, process, software and systems engineering as well as customized services on Additive Manufacturing (AM) technologies.

You want to experience, how ACAM works? Choose the Basic Partner status. You are an expert in AM and you wish to establish a strategic cooperation with the Aachen Network? You want to actively cooperate with the research partners in bi- and multilateral projects and you would like to decide on the ACAM R&D roadmap as a steering committee member? In this case, the Business Partner status is the right one for you. You are a provider of AM machines, materials, software or services and you would like to support the ACAM with your capabilities? In this case, let us talk about the opportunity to become a Cooperation Partner.

Contact Person Dr. Johannes WitzelPhone +49 241 [email protected] Center for Additive Manufacturing GmbH

BOOTH 2dIn front of Entrance

EXCELLENCE NETWORKS

Lab of the Future: FabBus Takes 3D Printing Directly to Schools and Companies

TheFabBusisaninitiativetopromoteinterestinthefieldsofscience,technology,engineering and mathematics (STEM) with modern teaching methods. Through a hands-on and intellectual examination of these topics, people of all ages are encouraged to discovertheirscientificcuriosityandtechnicaltalents.Studentlaboratorieshavebeen establishedasaneffectivetooltomakeyoungpeoplemoreexperiencedinscientificfieldsandsparkanearlyinterestinresearchanddevelopment.Withthehelpofthisbus,even the youngest at schools and companys with interest on Additive Manufacturing (AM) can be introduced to the new possibilities. Our lab allows companies to under-stand the technology through active experience. In different courses you will learn the whole AM processes with different technologies. The FabBus will come directly to you, which saves you time as well as the costs for your employees‘businesstrips.Intheworld‘sfirstprojectofitskind,theexcitingtopicof Additive Manufacturing is explained in an interesting, tangible, clear and compact manner.

Contact PersonM.Eng. Dawid ZieburaPhone +49 241 [email protected] Zentrum für 3D-Druck Verbundprojekt Fraunhofer ILT & FH Aachen

BOOTH 2eIn front of Entrance

EXCELLENCE NETWORKS

AKL e.V. – Aix Laser People ArbeitskreisLasertechnikAKLe.V.isaregisterednon-profitassociationformedin1990by a group of companies and private individuals aiming to pool their experience and conduct joint public relations activities in order to spread the use of laser technology inindustryandpromotethesharingofscientificideas.The“InnovationAwardLaserTechnology” aims to reward excellent achievements in applied research and outstanding innovationinthefieldoflasertechnologyandtoshineaspotlightontheirauthors.

In 2015, around 150 laser experts and enthusiasts were signed up as active members of the AKL network. The association’s activities include disseminating information on innovations in laser technology, organizing conferences and seminars, compiling edu-cational material dealing with laser technology, stimulating the interest of future young scientists, and providing advice to industry and research scientists on questions relating to laser technology.

Contact PersonDipl.-Phys. Axel Bauer (General Secretary AKL e.V.)Phone +49 241 [email protected] Lasertechnik AKL e.V.

BOOTH 2bEntrance

CENTRAL INFORMATION

European Laser Institute – ELI e.V. Optical technology is taking an increasing hold on all domains of industry and science. Europealreadypossessesastrongpositioninthisfieldbyvirtueofitsnumerousexpertsand excellent research and development facilities. Nevertheless, it has been realized that there is an urgent need to link the existing sources of know-how and expertise, and to enhance the performance of joint research activities. Consequently, the European Laser Institute(ELI)hascreatedanefficientplatformbringingtogetherthenecessarycompe-tence and knowledge on optical technologies. By promoting technology transfer within Europe, ELI aims to enhance the international lead of European industry and research in thefieldoflasertechnologyandphotonics.Byworkinginclosecollaborationwithexist-ing national and international organizations, the ELI network of industrial and academic researchinstitutionshelpstoinfluenceR&DpolicyonanationalandEuropeanlevel.

Contact PersonDr. Alexander OlowinskyPhone +49 241 [email protected] Laser Institute ELI e.V.

BOOTH 2cEntrance

CENTRAL INFORMATION


76

Upper Stage Engines of Future Ariane 6 Since 1957, rocket engine and propulsion technology has been one of our most impor-tant and successful core businesses. During that time, the Ottobrunn division of Airbus Defence & Space has become an European center of excellence for launch vehicle and upper stage propulsion, having set a number of World and European achievements. Rocket engines, rocket subsystems and associated technologies developed at Ottobrunn have contributed to the success of the Ariane launch vehicle family. Upper stage rocket engines from Ottobrunn, like the VINCI engine, have placed hundreds of heavy com-mercial satellites into their target orbits as well as the Automated Transfer Vehicle for resupplying the International Space Station. Furthermore, Airbus Defence & Space is a leader in the design and manufacture of launcher and orbital propulsion components using Additive Layer Manufacturing (ALM) processes, often referred to as 3D printing. For some years now, Airbus Defence & Space has successfully demonstrated expertise in this relatively new technology for the demanding applications of launcher (rocket engine injection heads) and orbital propulsion (10 N platinum thrusters). For the future, additive manufacturing provides opportunities to improve and develop established and existing products still further.

Contact PersonDr. Steffen BeyerPhone +49 89 [email protected] DS GmbH

BOOTH 3aMain Hall

SPECIAL EXHIBIT

“LIGHT” The installation consists of the word “LIGHT”, written in letters about two meters tall with a visible internal hollow structure. By spelling out the word “LIGHT”, this installation makes reference not only to optical technologies but also to the “light” in “lightweight construction”. Laser Additive Manufacturing, a key competence of Fraunhofer ILT, is used in lightweight construction especially for products and tools made of metal. The installation for the exhibition was produced in Europe’s largest commercial 3D printing jobshop – i. e. Materialise, in Leuven, Belgium – and are unique in their size and design. The 3D printing technique used to make the plastic sculpture for the exhibition is stereo-lithography, while the AM-technologies which are mainly used at the Fraunhofer ILT concentrate on Selective Laser Melting and Laser Metal Deposition. In general, 3D printing makes it possible to produce customized parts and tools, including one-off designs, at an affordable cost. Additive Manufacturing technologies are therefore an ideal solution for applications involving complex component geometries requirement for short response times, a high degree of customization or the sparing use of raw materials. These advan-tages make this process a key aspect of Digital Photonic Production (DPP) promoted by Fraunhofer ILT.

Contact PersonDipl.-Phys. Axel BauerPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 3bPhotonics Cluster

SPECIAL EXHIBIT

New Low Cost SLM System Selective Laser Melting (SLM) is an Additive Manufacturing (AM) technology and allows for building components out of different metals and with complex geometries. This kind of technology will be established more and more in the manufacturing industry.

The Aachen Center for 3D Printing, a collaborated AM group formed by the Fraunhofer ILT and the Aachen University of Applied Sciences (FH-Aachen), has been founded to offer the access to the 3D technologies primarily for small and middle sized companies.One of the projects of this collaboration is the development of an Low Cost SLM system.This concept passes on expensive laser scanner and control systems and enable a new process management. The goal is to realize a basic SLM system for less than 10,000 € in order to make the SLM process affordable for a wider range of users, in particular for SMEs to enter in metal AM technology.

Contact PersonM.Eng. Dawid ZieburaPhone +49 241 [email protected] Zentrum für 3D-DruckVerbundprojekt Fraunhofer ILT & FH Aachen

BOOTH 2fIn front of Entrance

EXCELLENCE NETWORKS


98

Design Center Additve Manufacturing AM technologies like SLM have enable the production of end use products directly from CAD data. Many companies are exploring the use of SLM for specific applications, such as mass customization of medical implants, optimized tooling inserts or lightweight aero-space parts. AM technologies offer the generation of almost all conveyable geometries and shapes, contrary to conventional manufacturing technologies. Only a fundamental mind changing in the product design process provides the engineer with the full design freedom of this technology. Furthermore, SLM is not completely freeform as the inherent process difficult can distort many part geometries and designers often lack an under-standing of these process issues and their effect on the final part.The aim of the Design Center is to address this lack of design knowledge, by developing different trainings, design rules and methodologies to allow more predictable and reliable results as well as to open the new design freedom to companies.

Contact PersonM.Eng. M.Sc. Stephan ZieglerPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 6bE100.C12

ADDITIVE MANUFACTURING

Laser Powder Bed Fusion of Special Materials In recent years the interest in Additive Manufacturing (AM, 3D Printing) technologies such as laser powder-bed fusion (L-PBF) emerged rapidly. L-PBF offers the unique opportunity to build highly complex parts cost-efficiently. For several applications, L-PBF is now being used for manufacturing rather than prototyping. However, the range of commercially available materials for L-PBF is small which still limits a more widespread application of L-PBF. This booth shows demonstrators for various applications out of novel materials such as magnesium alloys, copper alloys, iron aluminides or titanium aluminides.

Contact PersonDr. Wilhelm MeinersPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 11cE100.A13


Inner Processing Optics and Powder Feed Nozzles IXUN Lasertechnik GmbH develops and delivers customized laser optics (in particular, inner processing optics) as well as powder and protective gas nozzles for all laser beam sources for processing (laser hardening, alloying, joining and laser cladding/coating) of outer and inner contours. With know-how and long-term experience in the sector of surface processing with laser radiation, IXUN Lasertechnik GmbH offers individual solutions for processing of single parts and mass production components.

Range of services:Laser Cladding, Laser Hardening, processing of individual and series parts, pre- and post-processing for delivery of pre-finished, laser-processed components, feasibility studies, consultation for the development of customized laser plant concepts, support and consultation for production ramp-up and problematic cases.

Contact PersonDr. Khudaverdi KarimovPhone +49 241 [email protected] Lasertechnik GmbH

BOOTH 4E100.C10


A Joint Approach in Additive Manufacturing of Nickel-Base Superalloys for Turbomachinery Applications The powder bed Additive Manufacturing process Selective Laser Melting (SLM) is used for direct fabrication of functional metallic parts. Advantages like low material consumption, high geometrical freedom or short lead time are principally placing this process at a front position to produce high value small-scale series, like for instance found in gas turbines in the energy and aviation industry. Regarding materials such as Inconel® 625 or Inconel® 718, weldable nickel-base superalloys which are widely used in both industry sectors, this front position is step by step reached by major OEMs right now. Never-theless, technical drawbacks like achievable surface quality or limited transferability of process parameters between production machines still exist. Additionally, a fundamental understanding and modelling capability of the microstructure evolution during the SLM-process would allow for an improved SLM process in the future. These issues are addressed in the joint research project DPP SLM Turbine in cooperation with Access e.V., Siemens and MTU Aero Engines at the Department for Laser Technology and the Fraunhofer ILT.

Contact PersonDipl.-Ing. Jeroen RissePhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 6aE100.C12



1110

Cladding Head with Coaxial Wire Feeding for Laser Metal Deposition (LMD) For some materials and parts it is advantageous to use wire instead of powder additives for the LMD process. By utilizing a wire as feed material, major disadvantages of currently used powder-based LMD processes can be eliminated. Contamination of the process cellwithmetalpowder,significantmateriallossesduringtheprocessandinsufficientpowder quality are just some of the problems which are solved by this approach. A con-tinuous circular laser beam is one of the distinguishing features of this new laser cladding head. The laser beam and the wire are arranged coaxially to one another. Through this design the welding process is truly independent of the direction of feed. A very high degree of material utilization paired with a welding process completely independent fromthefeeddirectionoftheprocessresultsinefficientandprecisebuildupoftwo- and three-dimensional geometries. Reduced mass of the head through advanced design makeshighlydynamiccladdingprocessesfeasible.Byallowingtheuseoffinefeed wires, even intricate geometries can be built up in near-net-shape. All optical elements ofthecladdingheadarereflectivesoitispossibletousevarioustypesoflasers.

Contact PersonM.Sc. Jana KelbassaPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 15aE100.A09


3D Photopolymerization Photopolymerzation is a chemical reaction (curing) of liquid monomers and/or prepoly-mers induced by radiation. UV-polymerization is widely used for curing of UV-coatings and varnishes, lithography and 3D printing (laser stereolithography). In comparison to planar lithography, the control of the polymerization in the third dimension (vertical z-axis) for building of 3D objects means an additional challenge in process development. In our group “Biofabrication and Laser Therapy” at Fraunhofer ILT we are investigating new laser processes and material formulations for 3D printing. We focus on thiol-ene based chemistry as an alternative to state-of-the-art acrylate and epoxy resins for stereo-lithographic processes. In Laboratory E321 we demonstrate 3D printing technology based on DLP (digital light processing) for research on new resin formulations for biome-dical applications. Additionally a setup for deep UV laser stereolithography is presented which allows processing of low toxicity materials.

Contact PersonM.Sc. Andreas HoffmannPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 36E321-Biofabrication


Additive Manufacturing by Laser Metal Deposition Laser Metal Deposition (LMD) also known as laser cladding can be used as an additive manufacturing process by cladding layer upon layer. The result is a near net-shape com-ponentwithalmost100%densityandapropertyprofilewhichmeetsthespecificationsoftheusedmaterial,orevenperformsbetterduetothefinemicrostructurecreatedbythe high cooling rates during LMD. The size of the components is only limited by the handling system. In contrast to powder bed based technologies LMD offers the possibi-lity to produce new material concepts e.g. gradient properties or build-up of lightweight hybrid components consisting of various alloys. Preheating and low oxygen atmosphere are often mandatory, especially for manufacturing brittle materials as e.g. intermetallics. Potential applications are the production of functional prototypes and small batch parts. LMD can also be used to modify components for a more individualized production when small numbers of derivatives are required.

Contact PersonM.Sc. Silja-Katharina RittinghausPhone +49 241 8906-8138siljakatharina.rittinghaus@ilt.fraunhofer.deFraunhofer-Institut für Lasertechnik ILT

BOOTH 13E100.B12


New System Technology Components for Laser Metal Deposition Laser Metal Deposition (LMD), also known as laser cladding, can be used as an additive manufacturing process by applying volumes layerswise onto a component or preform. It also can be used as a repair technology for worn out components or as a surfacing technology for new components. The density of the deposited material is approximately 100%,hasagoodmetallurgicalbondingandafinemicrostructureduetothehighcooling rates that are typical for the LMD process. One key component for the perfor-mance of the LMD process is the cladding head. It mainly consists of a powder feeding nozzle and a laser optic. New developments in regard to cladding heads are shown in this booth.

Contact PersonDipl.-Ing. Frank MentzelPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 14E100.A10



1312

Micro SLM (Selective Laser Melting) IQ evolution is a developer of special cooling devices for electronic components and diode lasers by using the generative manufacturing procedure SLM

• Our products are micro cooler for high-power laser diodes, cooler for power electronics or LED as well as other complex 3D structures•Ourmicrocoolersareleadinge.g.toasignificantincreaseinthelifetime of the laser bars compared to the current copper based cooling echnology (the new materials used here are not exposed to corrosion and erosion)• We have special know-how in the Selective Laser Melting process and machines as well as in using special materials, pure materials and custom made material compounds•Weareabletoproducemicrostructuresfrom50μmup

Contact PersonDr. Thomas EbertPhone +49 241 [email protected] Evolution GmbH

BOOTH 9E100.A15

GENERATIVE METHODS

Fabrication of Micro Structures via µSLM- and Modulated Laser Radiation In order to expand the capabilities of the SLM process, research projects at the FraunhoferILTledtoasignificantincreaseofthesurfacequalityofsmall-scaledSLMparts by means of modulated laser radiation. Till today materials which can be processed by the procedure called Micro-SLM (µSLM) are stainless steel (316L), cobalt-chromium and nickel-titanium shape-memory alloys. The powder with particle sizes of under 10 µm is applied in layers of 10 µm and melted by a laserspot size of 25 µm. µSLM enables manufacturing parts in the sub-millimetre range with structure widths of down to 35 µm and surface roughness of Ra = 1,5 µm.ApromisingapplicationbenefitingfromµSLMprocessingisseeninthefieldof biomedical sciences, electronics and optical technologies where individual geometries with high resolutions and good surface qualities are required. The possibility to manu-facture complex micro structures with integrated functionality expand the application fieldoftheSLMprocess.

Contact PersonM.Sc. Lukas MasselingPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 10E100.A14

GENERATIVE METHODS

LMD, it’s Offline Planning and Simulation on a Six Axis Industrial Robot System by Using LMDCAM Software Laser metal deposition is a technique for building metal parts directly from a CAD drawing by laser melting of the additive material, in form of wire or powder, into beads that are deposited side by side and layer upon layer. The technique is well suited for rapid prototyping, low-volume manufacturing, and high-value component repair or modification.TheofflinetoolpathplanningisdonewiththemultiaxisCAMsoftwareLMDCAM, an inhouse CAM software developed at Fraunhofer ILT. The welding process, the tool path planning functionalities and the simulation capabilities of LMDCAM for LMD multi axis processing will be demonstrated on a Kuka industrial robot arm with 6 degrees of freedom for moving the the laser head relative to the substrate. The use ofsuchrobotsenableshighflexibilityintermsoffeasiblegeometriesandobjectsthatcanbemodifiedofrepaired.

Contact PersonDipl.-Phys. John FlemmerPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 44aE100.A04


Multi-Purpose Head for Laser Welding and LMD

On a high investment laser machine productivity is crucial. Usually, to run different processes, a change of the processing head is required due to the different demands regarding beam size for the process and media supply. Therefore, for the integration of different processes like welding and laser metal deposition (cladding) into one process headthespecificrequirementsoftheprocesseshavetobeaddressed.Typically,thewelding process has to be carried out in the focus of the laser beam whereas the laser metal deposition process often is carried out with a defocused laser beam. With a special combination of an adaptive head including a powder feeding nozzle both processes can be run in one set-up. The welding process followed by a cladding process will be demonstrated with a new multi-purpose head without any need of changing the setup or the tool center point of the machine.

Contact PersonDipl.-Ing. Gerhard BackesPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 45E100.A05



1514

3D Laser Cladding with Automated Generation of Welding Paths Despite being an established technology, laser cladding of 3D free form shapes suffers from the fact that it requires time-consuming off-line programming or complex robot teaching. LUNOVU has developed a technology that makes this effort obsolete, drama-tically improving the productivity. 3D parts surfaces are optically scanned and translated into a numerical model. After visualization on a PC screen, the user can define areas or volumes to be cladded with only a few mouse clicks. The system automatically gene-rates the required welding paths and the respective NC code which may be immediately executed. This technology shortens planning time, improves quality and reproducibility and reduces production cost to a minimum.

Contact PersonDr. Rainer BeccardPhone +49 2407 [email protected] GmbH

BOOTH 16Main Hall

GENERATIVE METHODS

Wear and Corrosion Protection with High Speed Laser Material Deposition The development of new coating technologies for the wear and corrosion protection of large, high-quality components in the manufacturing industry is becoming more significant, not only from an economic but also an ecological perspective. With LMD, high-quality pore- and crack-free coatings out of a large range of materials can be pro-duced with metallurgical bonding and low dilution. However, typical coating thicknesses (> 500 µm) are commonly too large for the wear- and corrosion protection and attainable surface rates in the range of 10 - 50 cm2/min far too small for the coating of large components.On that account Fraunhofer ILT is developing a novel approach for LMD – the highspeed LMD. With this new process variant, metallurgically bonded, high-quality layers in the thickness range of 10 - 250 µm can be deposited with surface rates up to 500 cm2/min and deposition speeds up to 200 m/min.The system presented is especially designed for high speed Laser Material Deposition and is intended for the use of rotationally symmetrical work pieces.

Contact PersonDipl.-Ing. Thomas SchopphovenPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 5E100.C11 EHLA

SURFACE TREATMENT

Aconity3D Aconity3D is a start-up, situated in Aachen’s high-technology surrounding of the RWTH University and Fraunhofer research institutes. With the founding team’s technological background in production and informatics, the company’s focus is set on 3D printing of metal parts by means of powder bed laser melting. At this year’s “Laser Technology Live“ Aconity3D will demonstrate the AconityONE a state of the art hybrid system which is suited for research and production surroundings. With it’s 400 mm build diameter and possibility for introducing a high temperature preheating, various challenges in qualifying new materials and applications may be tackled.

To learn more, come by and visit us.

Contact PersonDr. Yves HagendornPhone +49 241 [email protected] Aconity3D GmbH

BOOTH 11aE100.A13

GENERATIVE METHODS

Post Processing of SLM Parts In recent years, SLM is shifting from a pure prototyping technology to series production readiness. Due to the ability to manufacture components with almost no geometrical limitations, SLM is in the focus in the field of turbo machinery. However, parts, which are manufactured by SLM, have a typical high surface roughness (Ra ≥ 5µm). Thereby the post processing of complex parts, particular with areas that are difficult to access, is a huge challenge. The presented results discuss this problematic nature. Therefore SLM manufactured specimens receive a post treatment with various post processing technologies. The specimens are analyzed regarding the achievable surface roughness and the geometrical accuracy.

Contact PersonDipl.-Ing. Anders SuchPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 12E100.A12

GENERATIVE METHODS


1716

Resource-Efficient Inline Processing of Au-Layers for Mass Production The electronic industry experiences a steady growth of integration of functions which leadstoanincreaseddemandincost-efficientproductionprocesses.Nowadays,thinconductive contacting layers are applied by means of galvanic, PVD, or CVD processes. These methods are cost- and time-intensive and sometimes harmful to the environment because of the massive use of chemicals. Additionally, these deposition methods are not selective and thus, have a high usage of precious metals. Against this background, innovative and inline capable processes for electronic contacting layers are in great demand,whichallowaresource-andenergy-efficientproductionbymeansofselectivedeposition methods. For this reason, a process is developed at the Fraunhofer ILT which combines selective printing of metallic paste with selective laser based functionalization methods. This process allows the selective coating of metal substrates on high production rates and has the capability to be integrated in production lines of electronic components.

Contact PersonM.Sc. Nicole RitschelPhone +49 241 [email protected] Fraunhofer-Institut für Lasertechnik ILT

BOOTH 22aE107

SURFACE TREATMENT

Laser-Based Production of Polymeric Corrosion Protection Coatings As the global consumption of energy and materials continues to increase, sustainable anti-corrosion strategies are beginning to play an increasingly important role. The use of high-temperature resistant thermoplastics such as polyetheretherketone (PEEK) as a coating material for steel components represent a promising alternative to conventional anticorrosion coatings. The industry faces a particular challenge, however, when it uses steels sensitive to tempering at temperatures < 250 °C as the base material of the components to be coated. Alaser-basedcoatingapporachaimsatpreventingafunctionallyrelevantinfluenceonthe components. Therefore, PEEK powder is applied to the substrate as a dispersion by spraying or a knife-coating and is heated by means of IR laser radiation above the meltingtemperatureof340°C.Inthemoltenstate,thelayerdensifiesandthecoatingmaterial adheres to the substrates. Due to the short interaction times of the laser treat-ment, when compared to a furnace process, the thermal load on the tempering-sensitive base material is reduced.

Contact PersonM.Sc. Hendrik SändkerPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 22bE107

SURFACE TREATMENT

High Speed Surface Treatment with Polygon Scanners Traditional beam delivery techniques such as 2D galvanometer scanners offer scanning speeds in the range of some m/s up to some 10 m/s. For high throughput an increase of laser power and scanning speed is required. High power laser sources are mostely commercially available, whereas there is a lack of high speed scanners.Anewscannerconsistingofarotatingpolygonforbeamdeflectionoffersduetoair-bearing high revolution speeds of up 8000 RPM in combination with long focal length optics (f = 830 mm) a scanning speed of 1500 m/s is obtained. Due to the large width (45 mm) of the polygon mirrors high laser power can be transmitted (succesfully tested with 4.4 kW CO2 laser power). Thispolygon-scanneroffershighspeeddeflectioninonedirection,incombination withalinearaxisflatmaterialscanbelasertreatedwithhighthroughput.Duetohightemperature gradients this scanner is especially suitable for the functionalization of temperaturesensitivesusbstrates,wherethinfilms(sol-gel,nanodispersions,etc.)haveto be treated with high temperatures.

Contact PersonDipl.-Phys. Carsten JohnigkPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 7E100.C13.1

SURFACE TREATMENT

Micro Laser Cladding in Dimensions Below 100 µm: Dots, Lines and Large Areas Due to the need for an economical and ecological use of natural resources, there is an increasing market demand for processes which allow selective coating of metallic sub-strates with thin layers/lines/dots of noble metals or wear resistant alloys. Laser micro claddingissuchaprocess.Intheone-stepprocessafinepowderisfedintotheinter-action zone of the laser beam and substrate and is completely melted leaving a small contactdotorlinewithdimensionsbelow100μmandanexcellentbondingtothesubstrate. The heat input into the substrate is minimized due to the high precision of the process. The two-step micro laser cladding is widening the possible applications due toincreasingarea-ratecoatingspeedandgeometricalflexibilitybyremotemeltingwitha laser scanning system. The additive material is preplaced with an air spray technique, driedatlowtemperaturesandsubsequentlymeltedwiththelaserbeam.Infirsttrialsalayer thickness of approx. 50 µm with a Ni-based alloy was achieved even without any shrouding. Potential applications for micro laser cladding are selective electric contacting or wear protection of tools.

Contact PersonDipl.-Phys. Matthias BeltingPhone +49 241 [email protected] Fraunhofer-Institut für Lasertechnik ILT

BOOTH 15bE100.B09

SURFACE TREATMENT


1918

Laser Polishing of Metals The latest results on laser polishing of metals will be shown:• Machine tool for laser polishing• CAM-NC data chain for easy programming of the polishing of complex shaped 3D parts• Simultaneous and synchronized movement of 5 mechanical axes and 3 scanner axes together with a measuring probe for easy work piece alignment• Additive manufactured SLM parts polished with lasers• 2-Gloss-Effects on tools• Further laser polished samples (e.g. Titanium, Inconel 718, Aluminium, Tool Steel 1.2343, GGG40, …)

Contact PersonDipl.-Ing. Ingo Ross Phone +49 241 [email protected] Fraunhofer-Institut für Lasertechnik ILT

BOOTH 51aU120.1

SURFACE TREATMENT

Manufacturing of Glass Optics by Laser Ablation and Laser Polishing The current state of the development of a laser based process chain for manufacturing fused silica optics is presented. This process chain is currently under development and focuses on the fabrication of highly individualized, non-spherical optics, since conventional manufacturingmethodstendtobecomparativelyslowandexpensiveinthisfield.Inafirststepfusedsilicaisablatedwithlaserradiationtoproducethegeometryoftheoptics. A subsequent laser polishing step reduces the surface roughness and a third step uses micro ablation to remove the last remaining redundant material. Although the process chain is still under development, the ablation of fused silica already reaches ab-lation rates above 20 mm³/s. The second step, the laser polishing, reduces the roughness significantly.Themicro-roughnessisalreadysuitableforopticsbuttheformaccuracyisstillinsufficient.Thereforethethirdprocessingstepisunderdevelopmenttooptimizethe form accuracy.

Contact PersonM.Sc. Christian WeingartenPhone +49 241 [email protected] Fraunhofer-Institut für Lasertechnik ILT

BOOTH 51bU120.1

SURFACE TREATMENT

Surface Functionalization by VCSEL Technology Increasing surface property demands, e.g. wear protection, corrosion protection and low friction,exceedthelimitsofcurrentstateoftheartbasematerials.Hence,thinfilmsareapplied onto the base material to ensure reliable and enduring performance. However, heating steps are often necessary to functionalize (dry, sinter, partially melt or crystallize) theappliedthinfilms.Thereplacementofconventionalheatingbylasertreatmentallows for reaching high temperatures in top layers combined with high temperature gradients, enabling the use of temperature sensitive base materials. Moreover, surface functionalization by VCSEL technology allows dynamically adapting theintensitydistributionwhichleadstomanypossibleapplicationsinawidefieldofdifferent markets.

Contact PersonM.Sc. Susanne WollgartenPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 37E313

SURFACE TREATMENT

Local Laser Heat Treatment of Ultra-High Strength Steels The use of ultra high strength steels in the automotive industry is constantly increasing due to their potential for weight reduction combined with improved performance. Such steels are produced by thermal-mechanical treatment, cold rolling or press hardening and can achieve a strength well above 1000 MPa. However, the high strength reduces ductility which is unfavourable for massive forming operation as well as for crash per-formance. Required is a material which locally provides ductility and strength according tomanufacturingoperationsand/orthefinalfunction.Awaytoachievethisisalocalsoftening by laser heat treatment, either on the sheet or coil or on the part. High power lasers(>10kW)andtemperaturecontrolenablethesofteningwithhighefficiencyandaccuracy.Sincelasersofteningisatoollessprocess,itishighlyflexible.Furthermore,different levels of softening can be adjusted just as required for forming or performance. It can also be combined with other processes such as laser cutting.

Contact PersonDipl.-Ing. Sabrina VogtPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 46E100.A06

SURFACE TREATMENT


2120

Practical Solutions for Laser Cutting and Welding in Sheet Metal Applications Laser beam welding renders new applications and new design solutions in sheet metal constructionpossible.Combinedwithlaserbeamcuttingflexibilityofproductioncanbemaximised.Newwaysofdesignareapproachedutilisingthespecificpropertiesofbothprocesses.Thepartsondisplayshowabunchofapplications.Pipefittingscanbeweldedusing direct programming from calculation of the cylinder sections and subsequent cutting and welding on the same track in one set-up. Production welding of sandwich structures is facilitated by combining overlap and stake welds. A number of material can be processed including mild steels with up to 0.45 % carbon, stainless steels, titanium alloys, nickel base alloys, as well as copper and bronze. Recently developed are welding processes for aluminide-base alloys, martensitic stainless steels, and dissimilar materials. Sheet thickness ranges from small and mid sections in standard sheet metal construction to heavy sections with up to 20 mm, e.g. parts in chemical equipment, shipbuilding, and structural components.

Contact PersonDipl.-Ing. Martin DahmenPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 44cE100.A04

CUTTING

The Influence of Laser Beam Shaping on the Process Stability and Quality in Laser Fusion Cutting Fiber and disk lasers offer various technological and economic advantages. In thick section, however, the cut quality of the CO2 –Laser systems is still unmatched. To increase thequalityofthecutsmadewithfiberlasers,infundamentalstudiestheinfluenceofan elliptical beam shaping is investigated within the European FP7 project “HALO”. The beam shape is realized by several cylindrical lenses with different focal lengths allowing a wide variation of the beam ellipticity. In parameter studies on 8 mm thick stainless steelsheets,theinfluenceofthebeamshapeonthequalityofthecutflankaswellasonthemeltfilmdynamicsisanalyzed.Themeltflowinthekerfisvisualizedbyahighspeed camera with 100.000 fps. The images are evaluated based on a streak analysis in ordertoderivesignificantdynamicalandstatisticalparametersofthemeltflow.Duringthe investigation an extensive data base was created which includes several hundred measure-mentsofthecutquality,thecorrespondingmeltflowimagingandthederivedprocess characteristics. The obtained knowledge support the further development of sophisticated and application-oriented beam shaping concepts.

Contact PersonDipl.-Phys. Stoyan StoyanovPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 47aE100.B06

CUTTING

Cutting of Fiber-Reinforced Plastics Inproductionoffiberreinforcedplasticcomponents,reductionofcycletimeisoneofthe priority objectives to push its wide-spread use in mass production. End machining with lasers for trimming of components or cutting of holes overcomes limitations of me-chanical processing due to induced forces and intense tool wear. The use of high power cw-lasers leads to high processing speeds. However, quality demands such as narrow heataffectedzones(HAZ)andrectangularcutflanksrequirematerialandcomponentadapted processing and scanning strategies. One option is pre-cut machining with parametersoptimizedregardingefficiency,followedbyafinaltrimmingofthepre-cutedge which utilizes parameters to minimize the HAZ. Another variant is the expansion of the kerf width by staggered tracks to increase the processable thickness. Additionally, thekerfcanbeshapedasymmetricallytoincreasetherectangularityofthefinalflank.

Contact PersonDr. Frank SchneiderPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 32E100.C02

CUTTING

In-Situ Diagnostics System for Laser Cutting Instabilities of the laser cutting front cause loss of quality due to the formation ofstriations.ForIn-Situ-diagnosisofthemeltingandsolidificationdynamicsinlaser cutting, a trim-cut test bench is set up as a part of the SFB 1120 “Precision Melt Engineering“. During a trim-cut the laser beam is displaced relative to the original edge by less than a kerf width in the direction of the metal sheet. To maintain a guided super-sonicgasjetpathalongthemeltfilm,themissingcutflankissimulatedbyatransparentreplacement edge e.g. made of quartz glass to allow the cutting kerf to be observed by high-speed imaging during the process. The trim-cut test bench is equipped with 2 fast and accurate x/y-tables: one for the workpiece and one for the movable glass. With a high level of positioning precision and accuracy < 2 µm, a tolerance for parallelism < 15 µm and a speed range between 0,1 - 120 m/min as well as versatile control features, a sophisticated diagnostics system is available for systematic analysis of the laser beam cutting process.

Contact PersonM.Sc. Dennis ArntzPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 39E310

CUTTING


2322

Laser Welding of Copper and Steel for Battery Modules Lithium-ion battery cells are currently the most promising technology for energy storageine-mobility.Thecost-efficientproductionofenergystorageisakeytechnologyfor this rapidly growing industry. The laser beam welding can make a major contribution forflexibleandreliablejoints.Becauseofpriceandavailabilitythesocalled18650cellscan be used, which are primarily built in notebook computers and power tools. Since these cells have a small capacity in comparison to large-sized cells, so they must be connected in parallel to form larger cells. In this case a copper terminal is welded to anickel-platedlowalloysteelcanofthecellinanoverlapconfiguration.Thecanisthenegative pole of the cell. The joint must be achieved without a full penetration of the approximately 0.25 mm thick steel. This is carried out using spatial light modulation, which enables a controlled weld depth.

Contact PersonM.Sc. Johanna HelmPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 25aE032

JOINING

Scanner Welding of Prismatic Battery Contacts with Disk Lasers At present, Lithium-ion batteries are the most potential technology for energy storage inelectromobility.Thecostefficientproductionofenergystorageiskeyrequirement.To construct appropriate battery packs the separate cells have to be interconnected electrically. In contrast to bolted connections, substance to substance bonds between conductors by laser welding have the advantage of a much lower electrical resistance andthereforeanincreaseinefficiency.Laserscannerweldingenablesaflexiblebeampositioning, a low energy load, as well as minimized positioning and lower cycle times.

Contact PersonVahid Nazery GoneghanyPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 25bE032

JOINING

High Speed Cutting and Welding For the development of cutting and welding processes Fraunhofer ILT uses a dynamic 2Dmachinewith5gaccelerationand300m/minmaximumspeed.Thankstoafixedworking head and a moved work piece, the machine is predestined for versatile dia-gnostics in high speed process development. High speed laser processing is a key factor intheproductionchainoflightweightcomponentsbasedoneitherfiberreinforcedplastics(FRP)orhighstrengthsteels.Bothmaterialsaremechanicallydifficulttocut.Laser cutting is an attractive alternative to blanking or milling due to the fast, wear-free andflexiblefeaturesofthelaserprocess.Whencuttingandweldingautomotivesteel,ahighprocessingspeedandflexibilityimprovestheeconomicefficiency.Steelsheetsof1 mm thickness can be cut at 100 m/min with 4 kW laser power and weld at 30 m/min with2kWlaserpower.Thereductionofthermalloadisanessentialbenefitduringhigh-speed processing of FRP material. Short interaction time minimizes the heat affected zone. Process diagnostics helps to master such processes.


BOOTH 47bE100.B06

CUTTING

Laser Processing Heads for Cutting and Welding LaserfactGmbHdevelops,producesanddeliversbeamtoolsforflexiblemanufacturingwith lasers. The aim of Laserfact is the provision of laser processing heads which per-formextremelyreliably,efficientlyandflexiblyinindustriallaserapplications.Byusingsophisticated optics and nozzle design combined with solid engineering the products of Laserfact achieve optimum performance with striking simplicity in construction, operation and application. Laserfact supplies beam tools for laser cutting and laser welding with CO2 lasers and solid-state lasers. A specialty of Laserfact are combi-heads forflexiblelasercuttingandlaserweldingofsheetmetalcomponentswithoutchangingheads. A combi-head allows software-controlled process change on demand and with itsignificantcostsavingsregardinginvestmentandoperation.

Contact PersonHarald DicklerPhone +49 241 [email protected] GmbH

BOOTH 48Hall West

CUTTING


2524

Laser Impulse Metal Bonding (LIMBO) Due to the developments in e-mobility and other high voltage applications, power electronic components experience an increased demand in the recent years. However, the requirements of power electronic components represent a challenge for conventional interconnection processes due to the required high temperature stability and high relia-bility of the joint. The approach ”Laser Impulse Metal Bonding” (LIMBO) enables to melt a 0.2 mm copper sheet over a gap to a PCB, whereas the melt is accelerated by temporal modulation of the laser beam towards the PCB metallization. This allows to minimize the energy deposition in the PCB and achieves a weld penetration depth of less than 20 µm in the metallization while creating a joint with a crosssection of Ø 200 µm.

Contact PersonDipl.-Ing. Simon BrittenPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 38aE310

JOINING

Laser Ribbon Bonding for Power Electronics Laserribbonbondingisanewfieldofapplicationforlasermicroweldinginthe electronics industry, especially in the area of power electronics. Traditional ribbon bonding is conducted by using ultrasonic welding to create the bond between the aluminum or copper ribbon and a conductive surface. By adapting an ultrasonic ribbon bonderandequippingitwithafiberlaser,agalvanometricscannerandabeamfocusingand delivery system, a new technology for ribbon bonding is created. Results will be displayed including aluminum and copper ribbon bonds with a thickness of about 250 to 300 µm to DCB-substrates or battery cells. For the laser welding of the ribbons spatial and temporal power modulation is being used and the effect of this approach on the welded ribbons is presented.

Contact PersonM.Sc. André HäuslerPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 38bE310

JOINING

Technology Demonstrating Part – Laser in Polymer Processing The requirements for machining processes in polymer processing are versatile. The FraunhoferILThasdevelopedandqualifiedcustomizedprocessesforwelding,cutting,drilling, structuring and marking of polymers. The presented technology demonstrating part shows numerous laser-based processes, which are used in polymer processing.In order to fabricate the technology demonstrating part a process chain is built up, showing the following processes:• Laser cutting of PMMA with different material thicknesses (0.3, 1 and 2 mm) with CO2-laser•AblationofPMMAtogeneratemicrofluidicstructureswithCO2-laser• Absorber-free laser transmission welding of PMMA with diode laser radiation (λ = 1660 nm)•Lasermicrostructuringofstainlesssteel(1.4301)withfiberlaserradiation(λ = 1064 nm)• Joining of polymer-metal-hybrids with diode laser radiation (λ = 940 nm)

Allshownlaser-basedprocessesarecharacterizedbyhighflexibility,preciseenergy deposition and high level of automation.

Contact PersonM.Sc. Kira van der StraetenPhone +49 241 8906-158kira.van.der.straeten@ilt.fraunhofer.deFraunhofer-Institut für Lasertechnik ILT

BOOTH 26E030

JOINING

Laser Thermography Testing for CFRP

Inaerospaceandautomotiveengineeringlightweightdesignisofhighsignificance. Anessentialtaskisthenon-destructivetestingoflightweightpartsmadeofcarbon-fiber-reinforced polymers (CFRP) and the adhesive joints of these parts. For this ultrasound testing and thermography is the most common approach. For large and complex parts (e.g. in aerospace and automotive production) classical contacting ultrasound devices areinsufficientintermsofmeasurementspeed,contaminationandflexibility.Thelaser-based thermography testing overcomes these disadvantages. At Fraunhofer ILT a demonstration system for laser based non-destructive thermal testing of CFRP parts and jointsisdeveloped.Themainitemistogeneratealocallydefinedthermalexcitation.Thisenablese.g.ahighlyhomogenousthermalexcitationoradefinedinhomogeneousexcitation in order to take care of heat sensitive areas. The system includes a high-speed scannersystemcombinedwithafiber-coupledlaser.Thelaserwavelengthrangesfrom355 nm to 3000 nm. For detecting defects in the parts or joints, the temperature distri-bution is captured using a high-speed thermal imaging camera and processed by defect analysis algorithm.

Contact PersonDr. Thomas WestphalenPhone +49 241 8906-374 [email protected] für Lasertechnik ILT

BOOTH 34gE317

JOINING


2726

Practical Solutions for Laser Cutting and Welding in Sheet Metal Applications Laser beam welding renders new applications and new design solutions in sheet metal constructionpossible.Combinedwithlaserbeamcuttingflexibilityofproductioncanbemaximised.Newwaysofdesignareapproachedutilisingthespecificpropertiesofbothprocesses.Thepartsondisplayshowabunchofapplications.Pipefittingscanbewel-ded using direct programming from calculation of the cylinder sections and subsequent cutting and welding on the same track in one set-up. Production welding of sandwich structures is facilitated by combining overlap and stake welds. A number of material can be processed including mild steels with up to 0.45 % carbon, stainless steels, titanium alloys, nickel base alloys, as well as copper and bronze. Recently developed are welding processes for aluminide-base alloys, martensitic stainless steels, and dissimilar materials. Sheet thickness ranges from small and mid sections in standard sheet metal construction to heavy sections with up to 20 mm, e.g. parts in chemical equipment, shipbuilding, and structural components.


BOOTH 44cE100.A04

JOINING

High Speed Cutting and Welding For the development of cutting and welding processes Fraunhofer ILT uses a dynamic 2Dmachinewith5gaccelerationand300m/minmaximumspeed.Thankstoafixedworking head and a moved work piece, the machine is predestined for versatile dia-gnostics in high speed process development. High speed laser processing is a key factor intheproductionchainoflightweightcomponentsbasedoneitherfiberreinforcedplastics(FRP)orhighstrengthsteels.Bothmaterialsaremechanicallydifficulttocut.Laser cutting is an attractive alternative to blanking or milling due to the fast, wear-free andflexiblefeaturesofthelaserprocess.Whencuttingandweldingautomotivesteel,ahighprocessingspeedandflexibilityimprovestheeconomicefficiency.Steelsheetsof1 mm thickness can be cut at 100 m/min with 4 kW laser power and weld at 30 m/min with2kWlaserpower.Thereductionofthermalloadisanessentialbenefitduringhigh-speed processing of FRP material. Short interaction time minimizes the heat affected zone. Process diagnostics helps to master such processes.


BOOTH 47bE100.B06

JOINING

Process Monitoring in Laser Plastics Welding In many industrial sectors, laser transmission welding of plastics has become an established joining process. Especially when it comes to welding of safety-relevant components the assurance of weld quality is of major importance. In order to ensure quality, the industry increasingly demands in-line process monitoring systems, which are able to detect inadmissible deviations reliably. The presented monitoring system uses suitable sensors and cameras to have a closer look inside the laser welding process of plastics.

Contact PersonM.Eng. Maximilian BrosdaPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 38cE310

JOINING

The Materials Laboratory Targeted process development is only possible in conjunction with a powerful material analysis. Analysis of the incoming material gives information on its processability. Concurrent testing and analysis ensure the process development to be on the right trackandsupportunderstandingofthematerial’sresponsetoprocessing.Afinal characterisation delivers the quality benchmarks of the product. Based on the under-standing attained, detailed analyses of the defects leading to material or component breakdowncanbeconducted.Inconjunctionwithskilledpersonnelandscientific back-up almost every material can be treated.

Contact Person Peter BinczyckiPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 44bE100.A04

JOINING


2928

Welding of LMD-Produced 2.4682 and Wrought 2.4630 Dissimilar Joints Materials manufactured by additive techniques suffer in some cases from a limited welding suitability because of their anisotropy and metallurgical features. Therefore, fusion welding requires special attention. With view to repair cases a combination of two heat resistant materials has been investigated. The results give an insight into the mechanical properties and the fracture behaviour of laser-beam welded joints. The location of fracture varies dependent on the heat treatment and the testing temperature. An effect of the anisotropy depending on the weld heat treatment is visible. As the strength of the welded material is above the materials as delivered or cast, respectively. the combination of laser metal deposition and laser beam welding can be recommended for application.


BOOTH 50bE100.B07

JOINING

Laser Beam Welding of Ultra-High Strength Dissimilar Welds The increasing demand for ultra-high strength steels in vehicle manufacturing leads to the application of new alloys. This poses a challenge on joining especially by fusion welding. A stainless high manganese steel sheet with excellent strength and defor-mation properties stands in the centre of the development. Similar and dissimilar welds with a metastable austenitic steel and a hot formed martensitic stainless steel were performed. An investigation of the mixing effects on the local microstructure and the hardness delivers the metallurgical features of a weld. Despite of carbon contents at above 0.4 wt.% none of the welds have shown cracks. Mechanical properties drawn from tensile tests deliver high breaking forces enabling a high stiffness of the joints. The results show the potential for the application of laser beam welding for joining in assembly of structural parts.


BOOTH 50cE100.B07

JOINING

Laser Processing Heads for Cutting and Welding LaserfactGmbHdevelops,producesanddeliversbeamtoolsforflexiblemanufacturingwith lasers. The aim of Laserfact is the provision of laser processing heads which perform extremelyreliably,efficientlyandflexiblyinindustriallaserapplications.Byusingsophis-ticated optics and nozzle design combined with solid engineering the products of Laser-fact achieve optimum performance with striking simplicity in construction, operation and application. Laserfact supplies beam tools for laser cutting and laser welding with CO2-lasersandsolid-statelasers.AspecialtyofLaserfactarecombi-headsforflexiblelaser cutting and laser welding of sheet metal components without changing heads. Acombi-headallowssoftware-controlledprocesschangeondemandandwithitsignificantcost savings regarding investment and operation.

Contact PersonHarald DicklerPhone +49 241 [email protected] GmbH

BOOTH 48Hall West

JOINING

Application of Hybrid Laser Beam Welding to Joining of Excavator Booms The feasibility of hybrid laser welding for joining mid-section steel sheet with a thick-ness of up to 15 mm was investigated. Based on pre-existing parameter sets the range ofsafelyweldablematerialthicknessinvariousjointconfigurationswasespanded. The parameter studies led also to strategies for out-of-position welding. At a number ofexcavatorboomstheparametersetsweretested.Inspiteofthegreatflexibilityof theparameterstheweldqualityissignificantlydeterminedbytheedgepreparation.Where state-of-the-art current sources and wire feeders come to their limits combined weldingproceduresinadditionmayovercomeincompletegapfilling.Thespecimes weldedbythesetechniquesundergofatiguetestingaswellastrialoperationinthefield.


BOOTH 50aE100.B07

JOINING


3130

Micro Scanners for Selective Laser-Induced Etching (SLE) SLE is a two-step process for 3D micro-structuring of transparent materials like glasses and crystals. Laser radiation is focused down to a micro-sized spot inside the transparent materialandisabsorbedinthefocalvolumeexclusively(firststep)inducingamaterialmodification.Thelasermodifiedmaterialisselectivelyremovedbywetchemicaletching(second step).For the movement of a 2 micron-sized focal spot at a speed up to 10 m/s two kinds of Microscannershavebeendeveloped:AflexibleMicroscannerisdesignedforprototypingand small series of complex 3D structures, and a high speed Microscanner for special structures to be produced with a high throughput.Both scanners are made commercial available by the founded spin-off company LightFab. The scanners and structures fabricated with SLE are demonstrated at the booth.

Contact PersonDipl.-Phys. Sebastian NippgenPhone +49 241 [email protected] für Lasertechnik LLT

BOOTH 21aE110

MICRO TECHNOLOGY

LightFab LightFab offers precision 3D microfabrication in transparent materials by Selective Laser-Induced Etching (SLE) as well as the machines and system technology that are necessary for this production.TheSLEtechnologyenablesthe3Dremovalofmaterialwithinflat,transparentblankstomake products with arbitrary internal micro channel systems. Applications for those kind ofstructuresrangefromsimpleprecisionthrough/blindholesforfilters,titerplatesorfiberopticalconnectorstonewtypesofnozzles,microfluidicalchipsandMEMSdeviceswith three-dimensional freedom in geometry.

Contact PersonDipl.-Phys. Martin HermansPhone +49 241 [email protected] GmbH

BOOTH 21bE110

MICRO TECHNOLOGY

Laser Drilling of CFRP Preforms for Force Transmission Elements State of the art for machining CFRP is to mechanically drill or mill the work piece after the consolidation process. Conventional processes lead to high tool wear and often non-repairable defects in the work piece. Laser processing of the consolidated material can prevent force induced defects but could also lead to heat induced defects due to thetwoverydifferentmaterialpropertiesofcarbonfibersandtheplasticmatrix.One solution is to laser drill the non-consolidated, textile work piece, the so called pre-form, prior to the infusion process, insert force transmission elements and subsequently infusethepreformwithresin.Someofthebenefitsoflaserdrillingthetextileperformprior to the consolidation process are:• Geometrical freedom of hole shapes•Costefficientprocesseswithouttoolwearortoolsetuptimes• Possibility for reducing process time and steps• Defect-free manufacturing of the cut-outs with contactless material processingThus utilizing laser technology can lead to high performance structures with up to 7 times higher pull-out forces.

Contact PersonM.Sc. Dipl.-Ing. Stefan JanssenPhone +49 241 [email protected] Fraunhofer-Institut für Lasertechnik ILT

BOOTH 29E160.3

DRILLING

Helical Drilling of High-Precision Micron Scaled Holes Using Ultral-Fast Laser Pulses Themachiningofmicroholesfortheapplicationssuchasultrahighaccuracyfilterwiththe diameters smaller than 10 micron and aspect ratio (depth to diameter) more than 10 :1 is a challenge due to the limitation of propagation of gaussian beam and laser energy deposition. A helical drilling optic based on a rotating Dove prism provides a possibility to optimize the behavior of energy deposition during drilling process and de-monstratesadvantagesinrespectsofcontrollabilityandflexibilityinmicroholegeometry.Diameters of holes in the range of 10 to 300 µm are achievable in wall thickness 0.1 to 2 mm. Moreover, the taper of holes are adjustable without changing the focal position statically or dynamically. Combined with an ultrashort pulsed laser, the helical drilling optic can guarantee a geometrical accuracy < 1 µm and heat affected zone (HAZ) can be minimized to meet the demand of special applications, where HAZ is extrem crucial and should be avoided.

Contact PersonM.Eng. Chao HePhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 52aU102.1

DRILLING


3332

Deep-Engraving and Texturing of Large Scale Moulding Tools Micro and nano structured surfaces in plastics are now found in many areas of everyday life. Many of these structures are inserted during the injection molding process with a structured tool inserts. These tool inserts can be made by using lasers. For heavy and large scale moulds, structuring of freeform surfaces comes with difficultiesconcerningbeampathguidanceand/ormaximumloadofstages.For the technology of ablation with nanosecond short laserpulses, these challenges canbeaddressedbyusingfiberguidedlaser.Forultrafastlasersthetechnologyofbeam guiding and -stabilization is under development by Fraunhofer ILT.

Contact PersonDipl.-Ing. Andreas DohrnPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 30E100.A02

MICRO TECHNOLOGY

Glass Frit Sealing by Laser Radiation In industrial manufacturing glass solders are mainly applied in electro technology and electronics especially for the closure of electrode feedthrough and housing. The durability and the mechanical load of a glass solder joint depends on the mechanical stresses. Because of the problems with mechanical stresses the most joining processes require atemperature-time-profilewhichcausesathermalimpactforthewholecomponent-ry. Often the required temperature sequence damages sensible components inside the housing by diffusion processes. Thus a soldering technology which works with reduced temperature input and a local heating is needed. Glass soldering by laser radiation is an alternative to reduce the thermal input because of the localised energy absorption. The absorption of the laser radiation by the glass solder is an essential condition for a successful soldering process. By absorption the laser radiation the necessary temperature for a constant heating, melting and crack free soldering is achieved.

Contact PersonDipl.-Ing. Heidrun KindPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 49E100.A07

MICRO TECHNOLOGY

Texturing of Moulding Tool Surfaces Micro and nano structured surfaces in plastics are now found in many areas of everyday life. Many of these structures are inserted during the injection molding process with structured tool inserts. These tool inserts can be made by using lasers with ultrashort pulses. The use of ultrafast lasers offers the advantage of largely independency from the chosen material, so that e.g. hardened steel tools can be edited. Likewise, the geometry influencingmeltingdeposits,whichareobtainedthroughtheuseofnanosecondlaserscan be avoided to a large extent.In another application, the melt-free structuring of mechanically stressed surfaces, offers a way of minimizing friction for example on components of internal combustion engines.

Contact PersonDipl.-Ing. Andreas DohrnPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 28aE160.1

MICRO TECHNOLOGY

Ablation of Transparent Materials with Ultra-Fast Lasers Lasermicro-processingofglassandsaphireisarisingbusiness.Especiallyflat-paneldisplays, e.g. used in modern multimedia cell-phones, are a still rising market and new technologies for machinig of those thin glasses are needed. Therefore, in the next years andalreadynowavastdemandforfast,efficientandhighly-qualitativemanufacturingprocesses for thin glass sheets exists which include for example cutting and drilling of thin glass sheets. Laser processing especially with ultra short pulse lasers is a promising solution. The main focus on the processes is a fast and crack free ablation of the glass. To achieve a deep understanding of the process of ultra-short-pulsed laser ablation of dielectrics, the whole process is investigated including modelling and process diagnostics.

Contact PersonDipl.-Ing. Dipl.-Wirt.Ing. Christian FornaroliPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 28bE160.1

MICRO TECHNOLOGY


3534

Numerical Modeling and Simulation of Pulsed Laser Applications like Fine-Cutting, Ablation and Drilling Pulsedlasersareusedforapplicationseitherrequiringhighfluencesorbeinginneedto limit the continuous load (thermal, mechanical, electronic) for the involved materials. Industrial application cases investigated via means of modeling and simulation at Fraun-hofer ILT mainly refer to the Laser Micro Jet Technology (where a water jet is -amongst others- used for beam guiding purposes), the USP-Ablation and Filament-Cutting of (semi-transparent) Dielectrics (e.g. like Glass) and the Long-pulse Drilling of metallic work pieces (e.g. turbine components). The industrial application of pulsed laser processing is established already. However, there are gaps in understanding the physical mechanisms involved in laser ablation, especially issues related to the realization of desired ablation contours and maximum ablation depth. This is where modeling and simulation can offer an appropriate gain in process understanding. The models elaborated for the demons-trated application cases give an insight how crater shape, morphology of the ablation front and damage within the material evolve.

Contact PersonDipl.-Phys. Urs EppeltPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 17Hall West

MODELING AND SIMULATION

Simulation of Laser Cutting and Welding Laser cutting and welding are well established production technologies, which in the industrial application are rated by productivity and product quality. Nevertheless there seems to be still a certain potential for a design optimization based on physical modeling and numerical simulation. For laser cutting an interactive metamodel based on an approximative model has been developed, which helps to optimise the process itself. For laser welding one important quality characteristic is the component distortion. The simulation of the heat distribution inside the component makes it possible to optimise the distortion. A substitute heat source is formulated to determine the tem-peraturefields.Theautomationandtheaccelerationofthedeterminationsimplifiestheapplicationofsimulationtoolsandraisestheefficiency.Quicknumericalmethodsand optimisationalgorithmswhichautomaticallyfindthemodelparametersonthebasis of the experimental data were implemented.

Contact PersonDr. Markus NießenPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 31aMain Hall


Roll-to-Roll Laser Patterning of Thin Functional Films Organic electronics is promising to be one of the groundbreaking technologies to revolutionize our everyday lives by including new functionalities into nearly any item. Costisthemostsignificantbarrier,sincenewfunctionalitiesshouldnotincreasetheprice of the product dramatically. Roll-to-roll production is the solution to overcome the price barrier. In combination with integrated laser processes new possibilities are opened upforcost-efficient,versatileandhighthroughputmanufacturinglines.Laser patterning – the selective removal of layers without impact on the surrounding material–playsakeyroleinestablishingthinfilmtechnologiesinproduction.Theexhibitshowsamodularlabsystemforroll-to-rollfilmprinting,dryingandlaserpatterning. The laser module consists of a 1 to 11 beam splitter for parallelization and a galvo scanner forflexbility.

Contact PersonDipl.-Ing. Christian HördemannPhone +49 241 8906-8013christian.hoerdemann@ilt.fraunhofer.deFraunhofer-Institut für Lasertechnik ILT

BOOTH 52bU102.1

MICRO TECHNOLOGY

High-Throughput Diffractive Optics for USP Laser Processing Ultra-short pulsed lasers present a versatile tool for high precision processing of a broad variety of materials. Due to the outstanding features regarding workable materials, surface quality and ablation precision, USP lasers are used in many industrial applications. Theeconomicefficiencyoftheseprocessesismainlydeterminedbythelimitedablationrate of a few mm³ per minute. A scaling of the laser process by plainly increasing the average power or the repetition frequency is not feasible, because effects like plasma shieldingandthermalstresswillreducebothefficiencyandquality.A successful solution for this limitation is the parallelization by multibeam processing. Based on a diffractive, optical element (DOE) a static division of the laser is possible. With a switchable spatial light modulator (SLM) in combination with a fast galvo scanner, high ablation rates can be achieved while maintaining the high processing quality of ultra short pulse laser ablation. With this approach, a next step up to an all-optical manufacturing system can be provided.

Contact PersonDipl.-Phys. Patrick GretzkiPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 52cU102.1

MICRO TECHNOLOGY


3736

Machine and Beam Shaping Technology for Laser Micro Processing Pulsar Photonics is a manufacturer of fully integrated machine systems and beam sha-ping solutions for laser micromachining. The core competence of the of the company is mainly engaged in laser material processing using ultra-short pulsed lasers. With the RDX machine series Pulsar Photonics adresses the R&D-market and beginners in laser micromachiningwithaflexibleandcompactmachinesystemthatcaneasilybeadaptedto different laser processes. The C-series is a professional machine for industrial applications and production with focus on reliability, work piece handling and quality measurement.To increase productivity of laser micromachining processes in series applications Pulsar Photonicsfocusesontheincreasedefficiencybymultiplebeamprocessingandflexiblebeam shaping. With the MultiBeamScanner and the new FlexibleBeamShaper, Pulsar Photonics offers two machine integrable laser beam shaping modules for massive processparallelizationorflexibleshapingoffocalintensitydistributionsthatenableanewwayofprocessdevelopmentandefficientproduction.

Contact PersonDr. Stephan EifelPhone +49 241 [email protected] Photonics GmbH

BOOTH 18Hall West

SYSTEM TECHNOLOGY

Multi-MHz Ultra-Fast Laser Processing Ultrafast lasers are a versatile tool for micro processing of nearly any material. While the extremely short pulse duration enables high processing quality, the productivity is too small for many industrial applications. However, high-power ultrafast lasers – running with several MHz – promise upscaling of processes and a considerably reduction of processing times. Users running such ultrafast lasers with several MHz are facing new demands like the need for very high scanning speeds.With a polygon based scanning system, scanning speeds up to 360 m/s at focal length of 163 mm are possible. By making use of the speed of a polygon scanner, required pulse separationisachievable,evenat20MHzpulserepetitionrate.Forstructuringdefinedgeometries the laser is modulated synchronously to the position of the laser spot on the workpiece. With the polygon scanning system and a synchronised movement of the workpiece processing of an area of 100 mm x 100 mm takes only 4 seconds per layer.

Contact PersonDipl.-Ing. Oliver NottrodtPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 20E112.3

SYSTEM TECHNOLOGY

High-Power Adaptable Laser Beams “HALO” Laser Cutting is by far the highest value application of lasers, and Europe is a power-base for this technology ranging from sheet metal cutting with cw-lasers to ultra-short pulse applications like cutting of wide-bandgap materials. With the headline “High power Adaptable Laser beams for materials processing HALO” the HALO consortium addresses beammodificationasoneofthemostpromisingresearchfieldsforthenextcentury.Project results demonstrate how adapted laser beams change processing phenomena going beyond well-known limitations like “ablation stop” in glass cutting by diffractive optics and like “shadow instability” in sheet metal cutting suppressed by elliptical beam modification.Goingbeyondthe“cuttinglimit”insheetmetalcuttingbyadaptedbeampolarization. The limit for the laser power due to “nozzle damage” in Liquid Micro Jet LMJ precision cutting is demonstrated by beam shaping suppressing light diffraction. Nozzle design for stable liquid jet diameter in LMJ precision cutting avoids “splashing bybeamfluctuation”.

Contact PersonProf. Dr. Wolfgang SchulzPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 31bMain Hall


Process Monitoring for 3D Printing by SLM Process control for Selective Laser Melting is seen as one of the key enablers for future series production of SLM parts. Fraunhofer ILT shows a laboratory system for materials researchandprocessdevelopmentwhichprovidesaflexibleplatformforresearchandand validation.Asalaboratorysystem,theopticaltrainisspecificallydesignedandoptimisedforpro-cess control. It uses a pre-focus system in combination with a fast closed loop scanning system and interfaces to a set of coaxially coupled sensors to observe the melting pro-cess. Pyrometric sensors detect radiation from the melt pool at 100 kHz and a camera system provides a visual image of the processing zone while the beam position is recorded synchronously. The signals are visualized as a so called emission map which provides a spatial resolution of 100 micron even at scanning speeds of 10 m/s. As such, the monitoring system allows the detection of deviations in the thermal emission during the SLM process indicating potential process instabilities or defects in the SLM parts.

Contact PersonM.Sc. Dipl. Ing. (FH) B. Eng. (hon) Ulrich ThombansenPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 11bE100.A13

SYSTEM TECHNOLOGY


3938

Process Observation in CO2 Laser Beam Cutting TrumpfTrulas5030isanindustrialflat-bedlasercuttingmachinewithaCO2-laser. As part of the Cluster of Excellence at RWTH Aachen University, ICD D2 “Technology Enablers for embedding Cognition and Self-Optimisation into Production Systems“, this machine is equipped with a multi sensor system that allows live observation of the process. A high-speed camera system coaxially coupled with the processing beam monitors the interaction zone while the machine moves the processing unit at 200 meters per minute accelerating with 2 g.Current works focus on strategies to analyse the acquired data in process to enable self-optimisation of the machine. Together with the RWTH Aachen University Chairs LLT and NLD, a system is developed that implements cognitive functions by means of a controller component and a meta-modelled knowledge base.

Contact PersonM.Sc. Dipl. Ing. (FH) B. Eng. (hon) Ulrich ThombansenPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 43E100.B05

SYSTEM TECHNOLOGY

Material Identification with Laser-Induced Breakdown Spectroscopy – LIBS The laser-induced breakdown spectroscopy (LIBS) has become in recent years increa-singly important in various industrial applications. These primarily include inline process monitoring, mix-up inspection, recycling and the inspection of incoming and outgoing goods. To optimize the measurement process and the handling of different types of material, ranging from small electronic components over ceramic bricks to big metal coils, the Fraunhofer ILT offers a variety of versatile LIBS-based measurement concepts. The analytical capabilities can be adapted to the needs of our project partners. Solutions fordifferentfieldsofapplicationwillbeshownstartingfromhighspeedsortingofupto100metalpiecespersecondovertheidentificationofdifferentkindsofsteelbloomscovered with scale layers to the analysis of liquid slags.

Contact PersonM.Sc. Dipl. Ing (FH) Sven ConnemannPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 8E100.C15

EUV AND PLASMA TECHNOLOGY

Powder Nozzle Certification Laser Metal Deposition has established as a technology for functionalization of surfaces, repairandmodificationofcomponentsaswellasgenerationofnewparts.Themostimportantfieldofapplicationisthemanufacturingoftoolsandcombustionengines,stationarygasturbinesandaeroengines.AttheLMDprocessafillermaterialinform of a powder is melted using the laser beam and fused with the base material. Therefore thepowderfeedingintothemeltpoolisanimportantinfluencingvariablefortheresultoftheprocess.Thepowderefficiency,theoxidationbytheambientatmosphereand theroughnessofthecladdedlayerareinfluencedbythisparameter.Forthisreason thereisaneedforacharacterizationofthepowder-gas-flowtoassurethequalityof theprocessingresultandtodocumentthecomplianceofspecifiedparameters.Asasolution a measuring procedure has been developed that allows to scan the powder densitydistributionoftheentirepowder-gas-flowandtocalculateappropriateindicators.This method is used to certify powder nozzles by standardized parameters.

Contact PersonDipl.-Ing. Stefan MannPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 33aMain Hall

SYSTEM TECHNOLOGY

Fully Integrated Quality-Control-System for Laser Brazing Applications In Cooperation with Scansonic MI GmbH Fraunhofer ILT presents a quality control system for laser brazing. A high-speed camera is fully integrated into the brazing optics ALO3 without affecting the accessibility of the optics for joining 3D parts. The observa-tion system is completed by an innovative illumination modul that is also fully integrated into the brazing head. With this system the full brazing process is documented in an on-lineconfiguration;machineparametersaremonitrredaswellastheproductquality.The actual movement of the handling system is measured at the tool-center-point. Additionally the system aims the monitrring of seam imperfections like pores and wet-ting behaviour of the process. As algorithms are implemented on FPGA-technology the system is capable for real-time monitorring which opens up the possibility for close-loop applications and will reduce set-up times.

Contact PersonDipl.-Ing. Peter AbelsPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 35E327

SYSTEM TECHNOLOGY


4140

Compact Tunable Plasma-Based EUV Sources and their Applications in Nano Science and Spectroscopy Inourgroup,wedevelopscientificconceptsregardingtheuseofplasma-basedsources of radiation of extreme ultraviolet (EUV) and soft x-rays (SXR) in the spectral range between 1 and 50 nm with tunable wavelength or with wide selection of wavelengths. Such radiation supports nm-scale microscopy, and, due to nm-scale depth of penetra-tion in solids and liquids, it probes and generates nano-structures in 3D. Furthermore, these wavelengths match primary atomic resonances resulting in a possibility to map both chemical elements and their chemical binding states. In particular, we focus on coherent diffractive imaging (CDI), a lensless nanoscale imaging technique. Effectively, the objective lens in a typical microscope is replaced with an algorithm to convert from the reciprocal space diffraction pattern into a real space image. Furthermore, we used the EUV radiation in combination with a state-of-the-art PEEM for spectromicroscopy, previously only feasible at synchrotron beamlines. The third project combines a laser synchronized with the EUV source to enhance the brilliance of the system.

Contact PersonProf. Dr. Larissa JuschkinPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 23Hall East

EUV AND PLASMA TECHNOLOGY

Inverse Laser Drilling: High Aspect Ratio Micro Structuring of Dielectrical Materials Inverse Laser Drilling is a laser microstructuring technique to drill geometries of high aspectratio into dielectric materials like glass. The sample is placed on a vertically movable translation table with a polished surface facing upwards. The laser beam is focused throughthetopsurfaceontothebottomsurfaceofthebulk.Thebeamisdeflected byscanningmirrorsinthehorizontalplane,thiswaythedesiredgeometry’sfirstlayer is ablated. By moving the translation table and ablating layers step by step the entire geometry can be ablated or “drilled”. Drilling of holes with aspect ratios < 1:200 has been demonstrated.Due to a patented improvement of the drilling process chipping can almost totally be avoided. The polished surface remains unaffacted just to the edge of the opening. Thisallowsformanufacturingspatialfiltersormirrorswithsmallopeningsforalmostlossless geometric separation of laser beams.

Contact PersonDipl.-Phys., Dipl.-Volksw. Dominik EsserPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 19E103.2

LASER AND LASER OPTICS

An Automated Setup for Measuring Laser-Induced Damage Thresholds The automated setup allows testing of optical components with respect to laser-induced damagethreshold(LIDT)andqualificationofbatchesofthemforusageinvolatilelasersystems. It is conform with ISO 21254-2 and can be adapted to a variety of laser para-meters. It is currently equipped for testing at wavelengths of 1064 nm and 1645 nm. Single-frequency laser pulses with up to 500 mJ are used in order to test with large testspotdiametersandwithatemporallyandspatiallywell-definedpulseprofile.Thespecimen can be placed in a chamber and tested at different environmental conditions (process gas or vacuum). Testing capability at 2051 nm is currently under construction.

Contact PersonDipl.-Phys. Ansgar MeissnerPhone +49 241 [email protected] Fraunhofer-Institut für Lasertechnik ILT

BOOTH 24aE053


Pulse Energy Scaled Single Frequency Laser for Future Lidar Applications Inthefieldofatmosphericresearchlidarisapowerfultechnologytomeasureremotelydifferent parameters like gas or aerosol concentrations, wind speed or temperature profiles.Forglobalcoveragespacebornesystemsareadvantageous.Toachievehighlyaccurate measurements over long distances high pulse energies are required. A Nd:YAG-MOPA system consisting of a stable oscillator and two subsequent InnoSlab-based am-plifierstageswasdesignedandbuiltasabreadboarddemonstrator.Overall,morethan500 mJ of pulse energy at 100 Hz pulse repetition frequency at about 30 ns pulse dura-tion in single longitudinal mode was demonstrated. Recently, different MOPA systems comprisingasingleInnoSlabamplifierstageinthe100mJregimeweredesignedandbuilt for current and future airborne and spaceborne lidar missions. In order to address the 500 mJ regime the established InnoSlab design was scaled geometrically.

Contact PersonM.Sc. Florian ElsenPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 24bE053



4342

Customized Electronics and Drivers for Laser Applications BERATRON is specialized in electronic solutions for laser applications. Our products rangesfromsmalldriversforfiber-coupleddiodesorsuperluminescence-diodesover TEC cooling solutions to high current 19 inch systems up to 500 a current. The products are build in a modular way and can be customized after your special needs. The modules include CW, QCW and pulse driver electronics for laser diodes and are equipped with various analogue or digital interfaces (e.g. EIA-232, CAN, USB, Ethernet …). BERATRON also offers special trigger solutions (e.g. pulse-picking, frequency stabilized lasers) and customized laser control boards for complex laser systems. Applications are R&D, material processing, pumping, imaging, ranging, etc.

Contact PersonDipl.-Ing. Ulf RadenzPhone +49 241 [email protected] GmbH

BOOTH 33bMain Hall


Dense Wavelength Multiplexing and 35 µm Fiber Coupling We present two different concepts for dense wavelength multiplexing in the medium powerrangeandcouplingintoafiberwith35µmandanumericalapertureof0.2.While the 1st is based on DFB diode laser bars with a wavelength chirp of 2.5 nm and ultrasteepdielectricedgefilters,the2ndconceptisbasedonsimultaneouswavelengthstabilization and multiplexing in an external cavity by use of VBGs. The radiation of a diode laser bar, in which each single emitter is stabilized at chip level on its own wave-length,wassuper-posedforthefirsttime.Thesameoptomechanicaldesignwasalsoused for simultaneous external stabilization and superposition. The loss mechanisms occurring were analyzed in detail. To date, an output power of 26 W has been achieved fromafiberwith35µmcorediameter.Inthispowerrangesignificantlymorecompactand robust systems can be constructed through the use of internally stabilized diode laser at lower costs. For further power scaling, the losses incurred are reduced by opti-mizing the diode lasers, optical design and assembly, in addition, a polarization coupling is integrated into the setup.

Contact PersonDipl.-Phys. Ulrich WittePhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 34aE317


2-µm Laser Beam Source Developments Fraunhofer ILT has developed several laser beam sources with wavelengths around 2 µm basedonThulium-andHolmium-dopedfluoridecrystals.A200-WcwINNOSLAB laser osillatorwithaline-shapedbeamprofileat1.9µmhasbeenbuiltandiscurrentlyusedfor pumping a Ho:YLF INNOSLABamplifiercrystal.Inrodgeometry,Tm:YLF-laserwith 15 W (cw) at 1.9 µm and a Ho:YLF-laser with 8 W (cw) at 2.05 µm have been built. Additionally, q-switched laser pulses have been produced in a Ho:YLF laser oscillator. Up to 10 mJ at 100 Hz and 2.7 mJ at 1 kHz have been shown at 2051 nm. Currently, Ho:YLF INNOSLABamplifierstagesareunderconstruction,withwhichpulseenergies in excess of 50 mJ are aimed for. These laser sources are foreseen for usage in CO2-lidar systems and for LIDT-tests of optical components at 2 µm. There are, however, a number of applications of such beam sources in materials processing (e.g. of transparent materials) and health-care. Additionally, such lasers are commonly used as pump lasers for nonlinear frequency conversion into the MIR.

Contact PersonM.Sc. Philipp KucirekPhone +49 241 8906-8108philipp.kucirek @ilt.fraunhofer.deFraunhofer-Institut für Lasertechnik ILT

BOOTH 24cE053


Modular INNOSLAB Platform OverthepastdecadeInnoslabhasproventhatitisaflexibleandefficientplatform forhigh-powerlaseroscillatorsandamplifierswithawideparameterrange.Companieslike Edgewave and Amphos successfully take the design as a basis for their laser systems.EspeciallyInnoslabamplifiershaveproventhattheycanscalethepower andenergyofsmallormediumpoweroscillatorswhilemaintainingthespecific properties of the oscillator. Lasers with pulse lengths from ps to ns and cw lasers havebeenamplifiedthisway.The presented modular platform is the basis of several custom-designed laser systems thatweredeliveredbyFraunhoferILTinthepastyears.Duetoitsflexiblelayoutitcan be adapted to provide a solution for a large variety of customer requests.The platform supports applications where Nd based lasers are the right choice. Actually adaptations of the platform to host materials like Tm and Ho for applications at wave-lengths around 2 µm are under development.

Contact PersonDipl.-Phys. Marco HöferPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 24dE053



4544

Application Specific Beam Profiles: Tailoring the Induced Temperature Field Lasermaterialprocessingisavastlygrowingfieldwhichgraduallyreplacesconventionalmeansofheattreatment.Oneparameterthatstronglyinfluencestheperformanceoftheseprocessesistheintensityprofile.Differentbeamprofilesmayleadtoquitedifferenttemperature distributions in the material and therefore result in different shapes of the heattreatedzones.Toincreasemachiningqualityandprocessefficiency,applicationspecificintensitydistributionscanbederivedthatinduceaprescribedtemperaturefieldin the material. To achieve this, a method is developed that describes this situation as an inverse heat conduction problem which is solved using special optimization methods. The approach can be applied to all kinds of geometries as well as to stationary or time dependent distributions.

Contact PersonM.Sc. Annika VöllPhone +49 241 [email protected] Technologie Optischer Systeme TOS

BOOTH 34dE317


Fused Fiber Couplers for High-Power Diode Lasers WithintheEUfundedprojectBRIDLEtheFraunhoferILTdevelopsfusedfibercouplersforcombiningtheoutputfrommultiplefibre-coupleddiodelasersintoasinglefiber.Thediodelasersarebasedondensewavelengthmultiplexingfofiveemitterswithaspectralspacingof2.5nm,allowingforeffecientcouplingof26Wintoa35µmfiberwithanNA of 0.22. Seven of these modules are subsequently combined into a single 105 µm, NA0.22fiberusingafibercouplerwhichconsistsofsevenfibers.Thechallenginggoalinthis development was the preservation of the combined brightness of the modules with anefficiencyexceeding90%.Thenarrowspacingoftheemitters’centralwavelegthsallows for further scaling of the brightness by coarse wavelength multiplexing behind thefibercombiner.

Contact PersonDipl.-Phys. Oliver FitzauPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 34eE317


Freeform Optical Surfaces as Major Building Block of State-of-the-Art Lighting Systems Thefutureoflightingarehighefficientsmartlycontrolledsemiconductorlightsources,i.e. LED, OLED and laser diodes. A major building block of sophisticated lighting systems is the optics that shapes the light distribution on the target. Contrary to imaging optics, where optical surfaces only deviate slightly from spherical shapes in case of non-imaging opticsreflectingaswellasrefractingsurfacescanconsiderablydeviatefromasphere. InordertodesignthiskindofopticalsurfacesforspecificlightshapingapplicationsFraunhofer ILT developed the design software package “freeformOPT”. “freeformOPT” contains sophisticated state of the art algorithms for freeform surface design based on the solution of Monge-Ampere type equations, import and export facilities and an embedded Python interpereter that makes it easy to extend the software package meeting custom demands.

Contact PersonDr. Rolf Wester Phone +49 241 [email protected] für Lasertechnik ILT

BOOTH 34bE317


Automated Assembly of Optical Systems Presented is a mobile assembly cell for optical systems. Hereby the automated assembly of individual optical systems should be realized. In order to reduce the size, cost and assembly effort, the system uses a planar design of the optical system developed here at the Fraunhofer ILT. By using a high precision robot the optical components of the optical system can be alligned accurately up to 300 nm. Another outstanding advantage is that no adjustable mounts for the lenses are necessary, greatly simplifying the setup. The software for the cell is kept modular by using a Multi-Agent-System. This makes it easy to switch certain devices like the robot system, the optical model etc. in order to change the setup or to work on another assembly cell without changing the whole soft-ware.Thisalsomakeslaterdevelopmentsofameasurmentsystemandfittinganalyzingtoolsfortheopticalmodelveryefficient.

Contact PersonM.Sc. Martin HoltersPhone +49 241 [email protected] Technologie Optischer Systeme TOS

BOOTH 34cE317



4746

High-Power VCSEL Sources for Industrial Heat Processing Philips Photonics has developed new kilowatt laser sources based on VCSEL micro laser arrays (Vertical Cavity Surface Emitting Laser), delivering near infrared power in directed beams of scalable width of more than 1 meter. High process speed can be realized by a power density of 100 W/cm². Large target areas are treated directly, without expensive optics or scanner systems, thereby realizing considerable cost advantages. The robust and compact laser modules are easily integrated into industrial heating applications and production processes.An electronic driver system enables precise control and fast switching of the infrared power. Beyond that, individual emission zones of the VCSEL source can be controlled independently.Therebybesidesthetotalpoweralsothespatialheatingprofilecan be changed, even dynamically during operation, enabling an unprecedented level of processflexibility.At our application lab, various laser modules are shown together with a live application demonstration.

Contact PersonDr. Günther DerraPhone +49 241 [email protected] GmbH Photonics Aachen

BOOTH 40E302


1.5 kW Femtosecond Laser System Laser systems of the power class > 1 kW are suitable for cutting composite materials, removing dielectrics or blackening of metals and semiconductors by generating surface structures.TheYtterbiumbasedamplifiersystemforfs-pulsescombinesthehighgain of INNOSLABamplifiersandthehighaveragepowerofdiskamplifiers.Thesystemdeliversan average power of 1.5 kW at a repetition rate of 40 MHz. The pulse duration was measuredtobe710fs.ThebeamqualityisM²=1.5x2.0.TheseedsourceoftheamplifiersystemisanindustrialfiberMOPAwith7Waveragepower.Thepowerisincreasedbyatwo-stageInnoslabamplifierto720W.Afterspatialfilteringabeamqualityof M² = 1.24 x 1.14 is achieved at an average power of 640 W. The last stage of the amplifiersystemisathin-diskmultipassamplifier.TheYb:YAGdiskmoduleispumpedwith 4.2 kW at a pump spot diameter of approximately 10 mm. The laser beam is folded 18timesoverthediskwithinatotalbeampathof22musingflatmirrors.

Contact PersonDipl.-Phys. Thomas SartoriusPhone +49 241 [email protected] für Lasertechnik ILT

BOOTH 41E311


Thermo-Optical Modeling of Optics for High-Power Applications The application of multi-kilowatt lasers with high brilliance pushes optical systems for laser beam guiding and shaping to their limits. The absorption of laser energy in the bulk material and the coating causes local heating of the optical elements and reduces the optical performance. Consequently, the stability of laser material processes will be affected. The design of thermally stable optical systems requires a precise thermo-optical modelingwhichisrealizedbycouplingoffiniteelementanalysis(FEA)andray-tracing.At Fraunhofer ILT and RWTH University - Chair TOS, sophisticated numerical algorithms have been developed to transfer the temperature data from a FEA into a refractive index profilefortheray-tracing.Furthermore,thermalsurfacedeformationsaretakenintoaccount. This enables an accurate prediction of the occurring thermo-optical effects and will be demonstrated by using a showcase optic.

Contact PersonM.Sc. Tobias BonhoffPhone +49 241 [email protected] Technologie Optischer Systeme TOS

BOOTH 34fE317


Lenses Made of Synthetic Monocrystalline Diamond for High-Power Laser Optics In the scope of the Fraunhofer project “Diamond4Optics” the potential of diamond as an optical material for high-power laser applications in the wavelength regime from UV to NIR is investigated. Monocrystalline diamonds with lateral dimensions up to 8 x 8 mm² are grown with microwave-plasma CVD and are processed to spherical optics for beam shaping. The synthetic diamonds offer superior thermal, mechanical and optical properties which results in an extremely high damage threshold of the optical components even for very small optics. The diamond optics have been tested in the multi-kWregime,andnosignificantthermallensingorwavefrontaberrationshavebeenobserved. Due to the outstanding properties of the diamond, extremely compact and lightweight high power laser processing heads can be realized.

Contact PersonDipl.-Ing. Carlo HollyPhone +49 241 [email protected] für Lasertechnik ILT

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Lasers and Frequency Converters with Customized Wavelengths from UV to MIR Convertinglaserradiationtonewapplication-specificwavelengthsincreasesthe possibilitiesofusingmodernsolid-state,fiberanddiodelasersinindustryandresearch.By tailoring the combination of fundamental laser source and frequency converter, the FraunhoferILTdevelopsefficientandcost-optimizedbeamsourcesforawidevarietyofapplications. The output parameters of our customized lasers and frequency converters can provide laser wavelengths from UV to MIR, output power from the Milliwatt-level up to multi-hundred Watts and all time-regimes from CW operation to ultrafast pulses. Exhibitsincludecompactpackagesofefficientfrequencyconvertersaswellasexemplaryovendesignsfornonlinearcrystalsandtunablelasercrystals.Highlightsarefirstly,anOPG-based converter box providing high-power short pulses with addressable wave-lengths in the IR and secondly, a robust OPO unit with soldered optics and crystals for satellite-based LIDAR measurement of Methane.

Contact PersonDr. Bernd JungbluthPhone +49 241 [email protected] für Lasertechnik ILT

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Flexible Assembly Cell for Optical Systems For companies manufacturing optical systems the assembly process is often proprietary knowledge. Rising numbers of units may quickly demand industrial-level automation solutions allowing for high volumes by simultaneously ensuring stable quality, lots of variantsandlowcost.Therefore,aneasyprogrammable,expandableandreconfigurablemachinewithintuitiveandflexiblesoftwareenvironmentforprocessconfigurationisrequired. Within the frame of RWTH’s cluster of excellence Fraunhofer ILT and IPT jointly work on the questions arising from the challenges when automating complex optical assembly processes. Major target is to enable the companies to ramp up automated pro-duction by themselves and thus keep their process and product knowledge proprietary. The Fraunhofer IPT´s group “Assembly of Optical Systems and Automation” launched an assembly cell, which is tailored to the needs of optical systems manufacturers. Since January 2016 it has been producing structured light projection lasers for 3D gesture recognition in an industrial environment.

Contact PersonDr. Stefan HengesbachPhone +49 241 [email protected] für Lasertechnik ILT

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High-Stability Single-Frequency Yb Fiber Amplifier for Next Generation Gravity Missions As part of its Earth Observation program, the European Space Agency is overseeing missionstomeasurethegravitationalfieldoftheearth.Inordertoimprovethemeasure-mentresolutionfrompreviousmissions(e.g.GRACE),thisamplifierwasdevelopedtoexhibit a spectral bandwidth below 10 kHz at 1064 nm and to operate with extremely high stability for optical power as well as central wavelength. The beam source consists ofafiberamplifierdevelopedbyFraunhoferILT,whichscalesthesignalofanon-planarring oscillator to the desired output power, and a reference cavity developed by a project partnerwhichstabilizesthelaserinitsfrequency.Theactivemediumoftheamplifier isapolarization-maintainingsingle-modefiberwithstepindexprofile.Bymeansofaphotodiode and a customized, high-resolution electronics, the output power of the laser can be actively stabilized by modulating the pump power. The required output power of 500 mW could be successfully demonstrated while maintaining the stability criteria. Thedegreeofpolarizationisabove99%.Throughtheuseofsingle-modefibers,thebeam quality achieved amounts to M2 < 1.1.

Contact PersonDipl.-Phys. Oliver FitzauPhone +49 241 [email protected] für Lasertechnik ILT

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Key Optical Components for Rugged Laser Systems Many laser applications require a reliable long-term operation of the laser source in harsh environment. This means that the laser has to withstand temperature cycles and mechanical vibrations and shocks. This is especially true for industrial but also for space environment. With the goal to build a spaceborne LIDAR instrument that has to operate maintenance-free for more than three years a set of key optical components has been developed. In order to ensure long term stability especially when exposed to UV radiation, the key requirement is to avoid any organic material like adhesives or plastics. The soldering technique which is established for the mounting of laser diodes and laser crystals to heat sinks has been adapted for the mounting of mirrors, lenses, and nonlinear crystals for faraday isolators, pockels cells and frequency converters. Several thermal cycling tests between -30 °C and +50 °C as well as random vibration tests of 14 grms have been performed to validate the required robustness.

Contact PersonDr. Jens LöhringPhone +49 241 [email protected] für Lasertechnik ILT

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LIFTSYS – Laser-Induced-Forward-Transfer of Cells Bioprinting is a very new and promising technology to build up tissue like structures for tissue engineering. Several bioprinting technologies are under investigation within the community. The understanding of cell-cell communication is fundamental to understand the development of cancer and for the tailored development of new drugs. To investigate thefirstcellmicro-environmenttestsystemsconsistingofcellsarrangedinspecific pattern are needed. For the second analysis of single cells is needed. Single cell printing of living cells can be performed by laser-induced forward transfer (LIFT) which has turned out to enable a virtually contact-free printing process. Fraunhofer ILT has developed the laser tool “LIFTSYS” which can selectively pick out a single cell from a sample and transferthiscelltoaspecificsiteonasubstrate.Underoptimumconditionssinglecellscanbeplacedwithapositionaccuracyof+/-20µm.Whichallowsconstructingspecificmicro-environments to generate cell-based in vitro assays or for automated spectrometric cell analysis.

Contact PersonDr. Nadine NottrodtPhone +49 241 [email protected] für Lasertechnik ILT

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LIFE SCIENCE

Published byFraunhofer-Institut für Lasertechnik ILTSteinbachstraße 1552074 Aachen, Germany

Phone +49 241 8906-0Fax +49 241 8906-121info@ilt.fraunhofer.dewww.ilt.fraunhofer.dewww.lasercongress.org

ContactMarketing & CommunicationsDipl.-Betrw. Silke Boehr Phone +49 241 8906-288Dipl.-Phys. Axel BauerPhone +49 241 8906-194

Design & ProductionDipl.-Des. Andrea Crollwww.andrea-croll.de

© Fraunhofer-Institut für Lasertechnik ILT, Aachen 2016

IMPRINT PUBLISHING NOTES

Fraunhofer-Institut für Lasertechnik ILT

Steinbachstraße 1552074 Aachen, GermanyPhone +49 241 8906-0Fax +49 241 8906-121

[email protected]

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