In-situ investigation of laser conditioning of optical coatings

Zhouling Wu; Zhengxiu Fan; Dieter Schaefer

doi:10.1117/12.60114

29 July 1992 In-situ investigation of laser conditioning of optical coatings

Zhouling Wu, Zhengxiu Fan, Dieter Schaefer

Proceedings Volume 1624, Laser-Induced Damage in Optical Materials: 1991; (1992) https://doi.org/10.1117/12.60114
Event: Laser-Induced Damage in Optical Materials: 1991, 1991, Boulder, CO, United States

Abstract

Both cw and pulsed photothermal deflection techniques have been applied to make in-situ investigations of laser conditioning of optical coatings. Two different kinds of lasers have been used for the conditioning, namely 488 nm-cw-Ar⁺ and 1.06 micrometers -10 ns- Nd:YAG. The samples investigated include thermally evaporated TiO₂, ZrO₂, HfO₂, Al₂O₃, SiO₂, MgF₂, and ZnS single layers as well as TiO₂/SiO₂, ZrO₂/SiO₂, and HfO₂/SiO₂ HR coatings. While the conditioning effects on the damage thresholds vary from sample to sample and depend on the specific irradiation parameters, a good correlation is observed between the in-situ measured change in absorption and the improvement of the damage resistance. Also presented in this paper are the detection of the change in defect density and thermal conductivity of the irradiated area. The latter, however, is small for most of the samples.

Citation Download Citation

Zhouling Wu, Zhengxiu Fan, and Dieter Schaefer "In-situ investigation of laser conditioning of optical coatings", Proc. SPIE 1624, Laser-Induced Damage in Optical Materials: 1991, (29 July 1992); https://doi.org/10.1117/12.60114

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