Understanding of the abnormal wavelength effect of overcoats

Zhouling Wu; Michael Reichling; Zhengxiu Fan; ZhiJiang Wang

doi:10.1117/12.57209

1 June 1991 Understanding of the abnormal wavelength effect of overcoats

Zhouling Wu, Michael Reichling, Zhengxiu Fan, ZhiJiang Wang

Proceedings Volume 1441, Laser-Induced Damage in Optical Materials: 1990; (1991) https://doi.org/10.1117/12.57209
Event: Laser-Induced Damage in Optical Materials: 1990, 1990, Boulder, CO, United States

Abstract

In this paper wavelength dependent damage phenomena in SiO2 overcoats on TiO2/SiO2 and ZrO2/SiO2 HR coatings are systematically investigated with the help of various techniques, including a dynamical study of the damage process by time-resolved photothermal deflection technique, microscopic analysis of the absorption sites by CW-modulated photothermal microscopy, and observation of the coating microstructures and damage morphology by TEM and Nomarski optical microscopy. From the data for 355 nm and 1.06 micron radiation and a theoretical calculation of the temperature distribution inside the coating, we conclude that damage occurs first either in the HR coating or in the overcoat depending on the wavelength of the incident radiation.

Citation Download Citation

Zhouling Wu, Michael Reichling, Zhengxiu Fan, and ZhiJiang Wang "Understanding of the abnormal wavelength effect of overcoats", Proc. SPIE 1441, Laser-Induced Damage in Optical Materials: 1990, (1 June 1991); https://doi.org/10.1117/12.57209

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