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Proceedings Paper

Understanding of the abnormal wavelength effect of overcoats
Author(s): Zhouling Wu; Michael Reichling; Zhengxiu Fan; ZhiJiang Wang
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Paper 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.

Paper Details

Date Published: 1 June 1991
PDF: 14 pages
Proc. SPIE 1441, Laser-Induced Damage in Optical Materials: 1990, (1 June 1991); doi: 10.1117/12.57209
Show Author Affiliations
Zhouling Wu, Shanghai Institute of Optics and Fine Mechanics (China) and Freie Univ. Berlin (Germany)
Michael Reichling, Freie Univ. Berlin (Germany)
Zhengxiu Fan, Shanghai Institute of Optics and Fine Mechanics (China)
ZhiJiang Wang, Shanghai Institute of Optics and Fine Mechanics (China)

Published in SPIE Proceedings Vol. 1441:
Laser-Induced Damage in Optical Materials: 1990
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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