innovative mid-infrared high power source for resonant ablation of organic based photovoltaic...
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Innovative Mid-infrared high Power source for resonant ablation of Organic based photovoltaic devices
An EU FP7 collaborative project
An OverviewD.Wandt, Y. Hernandez, L. Leick, W. Richter, A. Grisard, G. van Steenberge, K. Walzer
Workshop WS06 Mid IR Photonics: Prospects and ChallengesECOC2012, September 16th, 2012, Amsterdam
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• Specific Targeted Research Project (STREP)
• Seventh Framework Programme
• ICT-2009.3.7 Photonics
• 3-years: 1 September 2010 to 31 August 2013
• 6 work packages, 37 deliverables and 5 milestones
• Two global players, two SME‘s, three research institutes
Facts and figures
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LZH (Germany, Coordinator)
Multitel (Belgium)
NKTP (Denmark)
Batop (Germany)
TRT (France)
IMEC (Belgium)
Heliatek (Germany)
The consortium
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Laser Processing of organic photovoltaic devices
• without UV-VIS-NIR produced photochemical processes • which converts photon energy into desired material modification
• minimal leakage of energy into heat, defect formation
• need to deliver laser energy before heat diffusion processes occur
IR-resonances of organic molecules
corresponding short pulse lasers
Resonant infrared ablation with a wavelength tunable laser system
The idea behind …
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Short-pulse mid-infrared multi-stage Laser system
• fixed wavelength/tunable Tm-fibre oscillator as seed source around 2 µm • high power Tm-fibre amplifier chain as front-end
• OPG/OPA based nonlinear wavelength conversion stage with single/multi grating orientation patterned GaAs
wavelength range: from 2.5 µm to 8 µm
pulse duration: ~ 250 ps, as defined
repetition rate: < 1 MHz
energy per pulse: 10 µJ at 6 µm
The laser source
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Tunable short pulse radiation systems
• Mode-locked Tm fibre oscillators (LZH)
• Tm fibre amplifiers (MULTITEL)
• GaAs nonlinear conversion stage (Thales)
Integration, Opto-Mechanical Engineering • components (all)
• subsystems (all)
Multi-functional Components
• Saturable absorbers (Batop)
• Fibre couplers (LZH)
• PCF based devices (NKTP)
• nonlinear crystals (Thales)
Resonant Infrared Ablation
• sample preparation (HEL, IMEC)
• process evaluation set-up (IMEC)
• ablation tests (IMEC, HEL, LZH, Multitel, Thales)
Needs … and Responsibilities
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Needs … and possible solutions
Pumplaser
Isolator
Pumplaser Pumplaser
Isolator
Tm-fibre oscillator
Tm-fibre preamplifier 1st Tm-power amplifier
long-cavity
AOM pulse picking
MIR-conversion stage
Pumplaser
Process evaluationIntegration/Demonstrator
2st Tm-power amplifier
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Current status …
Ultrafast Tm-fiber oscillator (WP2)
All-fiber set-up with polarisation maintaining fibers
Mode-locking by saturable absorber mirror (SAM)
Center wavelength 1980 nm, fixed by FBG
0.4 nm spectral width
10 ps pulse duration
20 MHz repetition rate
10 mW average output power
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Current status …
Ultrafast Tm-fiber oscillator XXL
Spectral shaping with passive PM 1950 fiber
Pulse stretching with chirped FBG
Power amplification with PM-Thulium fiber
Pulse picking with AOM
1nm spectral width
250 ps pulse duration
400 mW average power
Single-shot to fundamental rep-rate
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Current status …
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Current status …
Ultrafast Tm-fiber power amplifier (WP3)
3.2 Watt average output power
250 kHz repetition rate
12.8 µJ output energy
250 ps pulse duration
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Under development …
Nonlinear conversion stage (WP4)
Orientation patterned GaAs crystals in OPA/OPG configuration
2.5 µm to 8 µm wavelength range, tunable by seed, crystal temperature, multiple period, etc.
10µJ per pulse (@6µm)
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Under development …
Validation of the mid-infrared laser source for structuring organic photovoltaic material stacks (WP5)
IR absorption measurements/characterisation
Preparation of the process evaluation set-up
Integration of the fixed-wavelength laser source
Single layer ablation tests
Integration of the tunable laser source
Multi-layer ablation tests
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Final steps …
Demonstration of the overall functionality of the MIR laser source (WP6)
Mechanical and optical parameters
Integration/Compatibility with practical industrial applications
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Resonant Infrared ablation (RIA)
Proof of principle, scribing tests, using
Polycarbonate (PC) On resonance 3.39 µm Off-resonance 3.03 µm
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RIA ... the latest news
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Thank you for your attention
Visit our webpage: http://www.fp7project-improv.eu