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Supervised By: Presented By: Prof. D.S. Mehta Ajay Singh IIT Delhi 2014JOP2558

Design and Development of Solar pumped Nd:YAG Laser

Created by Trial Version

Created by Trial Version

Created by Trial Version

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https://en.wikipedia.org/wiki/Laser_construction

Laser Rod(Active Media) Pumping source

(flashtubes/ continuous gas discharge lamps/DPSS lasers

Laser Cavity & output coupler

Power Supply

Typical Nd:YAG Laser

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https://en.wikipedia.org/wiki/Laser_construction

Laser Rod(Active Media) Pumping source

(flashtubes/ continuous gas discharge lamps/DPSS lasers

Laser Cavity & output coupler

Power Supply

The Sunlight as pumping source 3.5 to 7.0 kWh/m2 per day Broad spectrum Not hazardous like mercury No power supply No dependence on electricity Available everywhere

Source:http://en.wikipedia.org/wiki/Sunlight#/media/File:Solar_spectrum_en.svg)

Typical Nd:YAG Laser

Basic Requirements: Collection of solar light Transportation of the light Laser cavity design Laser pumping by the light Oscillation/Amplification Optimization !!

Design of Solar pumped Nd:YAG LaserMotivation:

Focal length

Solar concentrator(Fresnel Lens)

Conversion of naturally available light into laser light

Alternate pumping source for lasers Ecofriendly system System with “No power supply” Low cost, field portable system Green Photonics

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Work done before mid semester evaluation Fresnel lens mount Procurement of Fresnel lens Procurement of Laser rod Focal length and Spot size measurement Fabrication of light guide I Cooling system Cavity design (on going )

Work done after mid semester evaluation Fabrication of light guide II Mechanical housing Design Simulation for positioning the Light guide Simulation for various loss mechanisms IR/Intensity control (tried)

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The Basic design

Fig. Basic design of the Solar Laser (Drawing work using Edraw Max)

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The Mechanical housing design 6

120 mm150mm

The Mechanical housing design 7

8Ray Diagram for the Lightguide

Fig. Showing loss mechanisms in the lightguige (considering conical part to be fully reflecting)

Loss mechanisms in the Lightguide 9

Fig: Showing optimization work for positioning(0,15,-15mm) the light guide (simulation carried out using Zemax)

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F @ 15mm F @ 0mm

F @ 15mm

Problem areas/Critical works

Fig: Showing alignment issues for the light guide inside the mechanical housing

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Fig: Showing losses in conical part of the lightguide

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13Forbidden works IR separation using prism IR separation using directional coupler(theoretical) Controlling light intensity using polymer layer IR control using water channel Transport collected light using Fiber bundle

http://chronicle.su/2013/06/08/anonymous-infiltrates-prism-intercepts-obamas-skype/

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16Summery of the work done so far… Procurement of Fresnel lens, Laser rod, Output coupler Fresnel lens mount Focal length and Spot size, spectrum measurement Work out and finalized the design Fabrication of light guides Cooling system Mechanical housing Design Simulation for positioning the Light guide Simulation for various loss mechanisms IR/Intensity control (tried) Light transport using fiber bundle IR separation using prism

The next step……Place the Laser rod in the light

guideCarry out the alignment *Water pump/electric motorLet us ASLSEROutput Characterization (if it is

there)Work on the secondary design

If NOT !!!

o Modify the design/alignment(Possible)

o Parabolic solar concentratoro Design the system for side

pumpingo Get LASERo Characterization

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The timeline

December

• Fix the laser rod in the cavity & alignment

• Place output coupler

January

• Design system for parabolic concentrator

• Simulation work for Laser pumping

February

• Laser pumping• Measure and characterize

the output

March

• Pumping, Characterization and Optimization

• Redesign• Thesis Writing

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[1]. J. Almeida, D. Liang, E. Guillot, and Y. Abdel-Hadi, “A 40 W cw Nd:YAG solar laser pumped through a heliostat: a parabolic mirror system,” Laser Phys. 23, 065801 (2013)

[2]. Joana Almeidaa, Dawei Lianga and Emmanuel Guillotb, Improvement in solar-pumped Nd:YAG laser beam brightness, Optics and Laser technology ,Volume 44,Issue

7,October2012

[3]. D. Liang and J. Almeida, Highly efficient solar-pumped Nd:YAG laser, Opt. Express 19 (2011) 26399-26405

[4]. L. Jing, H. Liu, Y. Wang, W. Xu, H. Zhang, and Z. Lu, “Design and optimization of Fresnel lens for high concentration photovoltaic system,” Int. J. Photoenergy 14, 539891

(2014)

[5]. D. Liang and J. Almeida, Highly efficient solar-pumped Nd:YAG laser, Opt. Express 19 (2011) 26399-26405.

[6]. C. G. Young, “A sun-pumped cw one-watt laser,” Appl. Opt. 5(6), 993–997 (1966).

[7]. D. Graham-Rowe, “Solar-powered lasers,” Nat. Photonics 4(2), 64–65 (2010).

[8]. H. Arashi, Y. Oka, N. Sasahara, A. Kaimai, and M. Ishigame, “A solar-pumped cw 18 W Nd:YAG laser,” Jpn. J. Appl. Phys. 23(Part 1, No. 8), 1051–1053 (1984).

[9]. M. Lando, J. Kagan, B. Linyekin, and V. Dobrusin, “A solar-pumped Nd:YAG laser in the high collection efficiency regime,” Opt. Commun. 222(1-6), 371–381 (2003).

[10]. T. Yabe, T. Ohkubo, S. Uchida, K. Yoshida, M. Nakatsuka, T. Funatsu, A. Mabuti, A. Oyama, K. Nakagawa, T. Oishi, K. Daito, B. Behgol, Y. Nakayama, M. Yoshida, S.

Motokoshi, Y. Sato, and C. Baasandash, “Highefficiency and economical solar-energy-pumped laser with Fresnel lens and chromium co-doped laser medium,” Appl. Phys. Lett.

90(26), 2611201 (2007).

[11]. T. Ohkubo, T. Yabe, K. Yoshida, S. Uchida, T. Funatsu, B. Bagheri, T. Oishi, K. Daito, M. Ishioka, Y. Nakayama, N. Yasunaga, K. Kido, Y. Sato, C. Baasandash, K. Kato, T.

Yanagitani, and Y. Okamoto, “Solarpumped 80 W laser irradiated by a Fresnel lens,” Opt. Lett. 34(2), 175–177 (2009).

[12]. Nature Photonics 4, 64 - 65 (2010) doi:10.1038/nphoton.2009.272

Work cited:

Thank you for your

attention