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Proceedings Paper

Laser damage of optical windows with random antireflective surface structures on both interfaces
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Paper Abstract

High average-power, nanosecond-duration, laser pulses induce damage on uncoated optics, due in part to an enhanced localized field at the exit surface of the components. Similarly, anti-reflection (AR) thin-film coated optics have similar field enhancement regions, due to multiple boundaries, and experience laser induced damage on both entry and exit interfaces. Sub-wavelength anti-reflection randomly structured surfaces (rARSS) have been shown to have a higher laser-induced damage threshold than traditional AR coatings. Previously published work detailed laser-induced damage on rARSS on a single surface of optical quality, planar, fused silica substrates; optimized for maximum transmission (99.5%) at 1064 nm. The present study explores the introduction of rARSS to both sides of the substrate. Laser-induced damage was systematically created and measured at contiguous locations along the substrate, using 1064 nm wavelength, 6-10 ns duration pulses. Laser output was focused to increase incident irradiance at the initial interface. Incident fluence was directly controlled by Q-switching the laser to create fluence values at, and above, damage thresholds for both entry and exit sides. It was determined that double-sided rARSS substrates have a higher damage threshold than thin-film AR coatings, while they have a lower damage threshold than entrance-only and exit-only sided rARSS (previous study), as well as, lower damage threshold than plain, optical quality, uncoated, fused silica. Damage on the exit-side of the substrate was ballistic in nature, showing surface cracks and outward-oriented debris craters. Contrastingly, damage on the entry-side of the substrate was thermally-induced local-densification of random structures with a latent footprint.

Paper Details

Date Published: 13 November 2017
PDF: 7 pages
Proc. SPIE 10447, Laser-Induced Damage in Optical Materials 2017, 1044706 (13 November 2017); doi: 10.1117/12.2279614
Show Author Affiliations
Christopher R. Wilson, The Univ. of North Carolina at Charlotte (United States)
Matthew G. Potter, The Univ. of North Carolina at Charlotte (United States)
Lynda E. Busse, U.S. Naval Research Lab. (United States)
Jesse A Frantz, U.S. Naval Research Lab. (United States)
L. Brandon Shaw, U.S. Naval Research Lab. (United States)
Jas S. Sanghera, U.S. Naval Research Lab. (United States)
Ishwar D. Aggarwal, The Univ. of North Carolina at Charlotte (United States)
Sotera Defense Solutions, Inc. (United States)
Menelaos K. Poutous, The Univ. of North Carolina at Charlotte (United States)

Published in SPIE Proceedings Vol. 10447:
Laser-Induced Damage in Optical Materials 2017
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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