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Proceedings Paper

Damage to coated ZnSe optical components by high-power CO2 laser radiation
Author(s): C. R. Haas; Ernst-Wolfgang Kreutz; David A. Wesner
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Paper Abstract

Coated ZnSe optical components are irradiated with high-power, pulsed CO2 laser radiation ((lambda equals 10.6 micrometers , pulse length approximately 100 ns) at fluences up to 210 J/cm2. The components are characterized at various stages of irradiation by thermography, optical microscopy, stylus profilometry, and surface chemical analysis (x-ray photoemission and Auger electron spectroscopy). During irradiation no temperature in the component surface is observed. Two types of coating damage occur within the irradiated area of the component: a breaking apart of the ZnSe overlayer of the coating system over relatively large areas, and the formation of isolate craters of diameter approximately 30 - 50 micrometers extending in depth approximately 3 micrometers through the coating system down to the ZnSe substrate. Chemically, the irradiated area is characterized by an oxidation of both Zn and Se and an increase in the stoichiometric ratio of Zn to Se. These effects are especially pronounced at the crater defects, and are attributed to localized optical absorption, leading to thermal stress and chemical reactions of Zn and Se with atmospheric or adsorbed water and/or oxygen.

Paper Details

Date Published: 28 July 1994
PDF: 8 pages
Proc. SPIE 2114, Laser-Induced Damage in Optical Materials: 1993, (28 July 1994); doi: 10.1117/12.180890
Show Author Affiliations
C. R. Haas, RWTH Aachen (Germany)
Ernst-Wolfgang Kreutz, RWTH Aachen (Germany)
David A. Wesner, RWTH Aachen (Germany)

Published in SPIE Proceedings Vol. 2114:
Laser-Induced Damage in Optical Materials: 1993
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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