Laser damage testing of windows with anti-reflection structured surfaces for high power continuous-wave near-infrared laser applications

Christopher R. Wilson; Thomas C. Hutchens; Jesse A. Frantz; Lynda E. Busse; L. Brandon Shaw; Jas S. Sanghera; Ishwar D. Aggarwal

doi:10.1117/12.2519194

17 May 2019 Laser damage testing of windows with anti-reflection structured surfaces for high power continuous-wave near-infrared laser applications

Christopher R. Wilson, Thomas C. Hutchens, Jesse A. Frantz, Lynda E. Busse, L. Brandon Shaw, Jas S. Sanghera, Ishwar D. Aggarwal

Author Affiliations +

Proceedings Volume 10985, Window and Dome Technologies and Materials XVI; 109850D (2019) https://doi.org/10.1117/12.2519194
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

High power continuous-wave (CW) and high pulse energy laser optical systems can suffer damage from untreated optics due to undesirable Fresnel reflections. With high energy pulse lasers, traditional anti-reflection (AR) thin-film coated optics are susceptible to localized field enhancement regions, due to multiple boundaries, and experience laser induced damage on both entry and exit interfaces. Sub-wavelength anti-reflective structured surfaces (ARSS) have been shown to have a higher laser-induced damage threshold than traditional AR coatings. Previously published work detailed nanosecond-pulsed laser-induced damage on planar fused silica (FS) substrates with random ARSS (rARSS) treatment (λ=1064 nm). This study details and compares laser damage and fatigue testing of rARSS treated FS via continuous-wave, 2 kW irradiation (λ=1075 nm). Gaussian laser output was focused to ~ 60-μm-diameter (1/e²), to increase incident intensity, yielding a maximum power density of ~ 70.7 MW/cm². Laser power and duration were controlled while monitoring the window’s optical transmission and entry/exit surface temperatures. CW durations at maximum power up to 5 min were used. Peak temperatures were recorded for untreated FS, as well as double side treated rARSS samples.

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Christopher R. Wilson, Thomas C. Hutchens, Jesse A. Frantz, Lynda E. Busse, L. Brandon Shaw, Jas S. Sanghera, and Ishwar D. Aggarwal "Laser damage testing of windows with anti-reflection structured surfaces for high power continuous-wave near-infrared laser applications", Proc. SPIE 10985, Window and Dome Technologies and Materials XVI, 109850D (17 May 2019); https://doi.org/10.1117/12.2519194

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