Damage thresholds of fluoride multilayers at 355 nm

Robert Chow; Mark R. Kozlowski; Gary E. Loomis; Frank Rainer

doi:10.1117/12.147425

24 June 1993 Damage thresholds of fluoride multilayers at 355 nm

Robert Chow, Mark R. Kozlowski, Gary E. Loomis, Frank Rainer

Proceedings Volume 1848, 24th Annual Boulder Damage Symposium Proceedings -- Laser-Induced Damage in Optical Materials: 1992; (1993) https://doi.org/10.1117/12.147425
Event: Optical Materials for High Power Lasers, 1992, Boulder, CO, United States

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.

Citation Download Citation

Robert Chow, Mark R. Kozlowski, Gary E. Loomis, and Frank Rainer "Damage thresholds of fluoride multilayers at 355 nm", Proc. SPIE 1848, 24th Annual Boulder Damage Symposium Proceedings -- Laser-Induced Damage in Optical Materials: 1992, (24 June 1993); https://doi.org/10.1117/12.147425

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