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Proceedings Paper

Reversible laser damage of dichroic coatings in a high-average-power laser vacuum resonator
Author(s): Robert Chow; Leon Val Berzins; Phillip A. Arnold; Gaylen V. Erbert
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Paper Abstract

In our application, dichroics in a high average power, near- IR, laser system have short operating lifetimes. These dichroics were used as the resonator fold mirrors and permitted the transmission of the pumping argon (Ar) ion laser light. Representative samples of two different dichroic optics were taken off-line and the transmission performance monitored in various scenarios. Irradiating these topics under resonator vacuum conditions, resulted in a degradation of transmission with time. Irradiating these optics in a rarefield oxygen atmosphere, the transmission remained steady over a period of days. The transmission loss observed in the optic tested in vacuum was somewhat reversible if the optic was subsequently irradiated in a rarefield oxygen atmosphere of 10 T of air also prevented the transmission degradation. In addition, test were performed to demonstrate that the optic damage was not caused by the ultra UV component in the Ar ion laser. Mechanisms that may account for this behavior are proposed.

Paper Details

Date Published: 3 March 2000
PDF: 9 pages
Proc. SPIE 3902, Laser-Induced Damage in Optical Materials: 1999, (3 March 2000); doi: 10.1117/12.379346
Show Author Affiliations
Robert Chow, Lawrence Livermore National Lab. (United States)
Leon Val Berzins, Lawrence Livermore National Lab. (United States)
Phillip A. Arnold, Lawrence Livermore National Lab. (United States)
Gaylen V. Erbert, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3902:
Laser-Induced Damage in Optical Materials: 1999
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; Keith L. Lewis; M. J. Soileau, Editor(s)

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