Influence of polishing and coating techniques on laser induced damage on AR-coated ceramic Yb:YAG

Mariastefania De Vido; P. Jonathan Phillips; Joachim Hein; Jörg Körner; Jodie M. Smith; Klaus Ertel; Paul D. Mason; Saumyabrata Banerjee; Oleg Cheklov; Thomas J. Butcher; Stephanie Tomlinson; Andrew Lintern; Justin Greenhalgh; Waseem Shaikh; Steve J. Hawkes; Cristina Hernandez-Gomez; Malte C. Kaluza; John L. Collier

doi:10.1117/12.2068037

31 October 2014 Influence of polishing and coating techniques on laser induced damage on AR-coated ceramic Yb:YAG

Mariastefania De Vido, P. Jonathan Phillips, Joachim Hein, Jörg Körner, Jodie M. Smith, Klaus Ertel, Paul D. Mason, Saumyabrata Banerjee, Oleg Cheklov, Thomas J. Butcher, Stephanie Tomlinson, Andrew Lintern, Justin Greenhalgh, Waseem Shaikh, Steve J. Hawkes, Cristina Hernandez-Gomez, Malte C. Kaluza, John L. Collier

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Proceedings Volume 9237, Laser-Induced Damage in Optical Materials: 2014; 92371M (2014) https://doi.org/10.1117/12.2068037
Event: SPIE Laser Damage, 2014, Boulder, Colorado, United States

Abstract

Yb³⁺ doped YAG is one of the most promising materials for high energy, high repetition rate laser systems producing nanosecond pulses. YAG as the host medium offers good thermo-mechanical and thermo-optical properties and, if it is used in ceramic form, it can be produced in large sizes with laser-grade optical properties. Large sized, laser-grade gain media are pivotal for the development of high energy kJ-class laser systems. Much effort has been devoted to the development of advanced polishing and coating techniques in order to produce optical materials able to withstand high fluence levels at different environmental conditions. In this paper, we present experimental results for 1 on 1 laser induced damage threshold (LIDT) tests in the nanosecond regime following ISO standards on anti-reflective coated ceramic Yb:YAG samples. Experimental results show that, generally, Ion Beam Sputtering (IBS) coatings perform better than Ion Assisted Deposition (IAD) coatings on low roughness substrates, while IAD and IBS coatings deposited on substrates characterised by higher surface roughness values offer a comparable performance. Performance of IBS coatings improves as substrate roughness decreases, whereas performance of IAD coatings improves as substrate roughness increases. No clear correlation has been observed between LIDT values and temperature or pressure. However, an inspection of damage sites allowed to conclude that both temperature and pressure have an impact on damage morphology.

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Mariastefania De Vido, P. Jonathan Phillips, Joachim Hein, Jörg Körner, Jodie M. Smith, Klaus Ertel, Paul D. Mason, Saumyabrata Banerjee, Oleg Cheklov, Thomas J. Butcher, Stephanie Tomlinson, Andrew Lintern, Justin Greenhalgh, Waseem Shaikh, Steve J. Hawkes, Cristina Hernandez-Gomez, Malte C. Kaluza, and John L. Collier "Influence of polishing and coating techniques on laser induced damage on AR-coated ceramic Yb:YAG", Proc. SPIE 9237, Laser-Induced Damage in Optical Materials: 2014, 92371M (31 October 2014); https://doi.org/10.1117/12.2068037

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KEYWORDS

Coating

Polishing

Ion beams

Laser induced damage

Ceramics

Laser systems engineering

YAG lasers

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