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Proceedings Paper

Damage thresholds of fluoride multilayers at 355 nm
Author(s): Robert Chow; Mark R. Kozlowski; Gary E. Loomis; Frank Rainer
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Paper Abstract

Fluoride multilayer coatings were evaluated for use in 355 nm high reflector applications. The LaF3/Na3AlF6, NdF3/Na3AlF6, and GdF3/Na3AlF6 multilayers had laser damage thresholds of 20 J/cm2, 17.9 J/cm2, and 7.4 J/cm2 (measured at 10 ns pulsewidths), respectively. High tensile stresses in the coatings restricted this evaluation to only 5-layer-pair partial reflectors (49 - 52%). The LaF3/Na3AlF6, NdF3/Na3AlF6, and GdF3/Na3AlF6 multilayers had tensile stresses of approximately equals 1.1 X 109, 1.3 X 109, and 9.3 X 108 dynes/cm2, respectively. Substrate material and glow-discharge processing of the substrates were found to influence the density of stress-induced coating fractures and damage thresholds in some cases. If stress fracturing and scatter can be controlled, these fluoride material combinations are suited for 3(omega) applications.

Paper Details

Date Published: 24 June 1993
PDF: 10 pages
Proc. SPIE 1848, 24th Annual Boulder Damage Symposium Proceedings -- Laser-Induced Damage in Optical Materials: 1992, (24 June 1993); doi: 10.1117/12.147425
Show Author Affiliations
Robert Chow, Lawrence Livermore National Lab. (United States)
Mark R. Kozlowski, Lawrence Livermore National Lab. (United States)
Gary E. Loomis, Lawrence Livermore National Lab. (United States)
Frank Rainer, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 1848:
24th Annual Boulder Damage Symposium Proceedings -- Laser-Induced Damage in Optical Materials: 1992
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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