Anti-reflection coating damage threshold dependence on substrate material

Ove Lyngnes; Aiko Ode; Dale C. Ness

doi:10.1117/12.836456

31 December 2009 Anti-reflection coating damage threshold dependence on substrate material

Ove Lyngnes, Aiko Ode, Dale C. Ness

Proceedings Volume 7504, Laser-Induced Damage in Optical Materials: 2009; 75040E (2009) https://doi.org/10.1117/12.836456
Event: Laser Damage Symposium XLI: Annual Symposium on Optical Materials for High Power Lasers, 2009, Boulder, Colorado, United States

Abstract

This paper presents a study of the laser damage threshold (LDT) of ion beam sputtered (IBS) Ta₂O₅/SiO₂ AR coated and uncoated samples ranging from low grade plate glass through neutral density glass to laser grade fused silica substrates. We find that the damage threshold varies by just over a factor of 3 from 9 to 33 J/cm² for 1064nm pulsed laser light with 20ns pulse length and 20 Hz repetition rate. The damage threshold of the uncoated samples ranges from 80 J/cm² to greater than 200 J/cm². We have estimated the single pulse temperature increase in the uncoated neutral density glasses to be as much as 400-500°C at the damage fluence. This is unexpected as multiple pulse exposure would rapidly bring the glass up to melting temperatures. A possible explanation is saturation of the absorption at high fluence levels resulting in lower temperature than estimated. We conclude that the absorption level in the IBS coating is too low to give a significant contribution to the LDT of the AR coated samples.

Citation Download Citation

Ove Lyngnes, Aiko Ode, and Dale C. Ness "Anti-reflection coating damage threshold dependence on substrate material", Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 75040E (31 December 2009); https://doi.org/10.1117/12.836456

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