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20 November 1996 S on 1 laser damage measurements on CO2-laser optics: defect- and stress-induced damage
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Proceedings Volume 2870, Third International Workshop on Laser Beam and Optics Characterization; (1996) https://doi.org/10.1117/12.259930
Event: Third International Workshop on Laser Beam and Optics Characterization, 1996, Quebec City, Canada
Abstract
Two different damage mechanisms are observed in laser damage experiments in the long-pulse regime for coated metal mirrors, partial reflectors and transmissive windows. These damage mechanisms can be distinguished by their time of damage behavior and are interpreted as induced by either defects or stresses in the coating. For both mechanisms, analytical calculations of the temperature evolution show a good agreement with the experimental data. Some samples show both damage mechanisms. The separation of these mechanisms by the time of damage analysis is used to study degradation effects due to an S on 1 irradiation. The experiments show that the defect induced damage threshold is in most cases independent of S, while the threshold of the stress induced damage decreases in a first approximation logarithmically with S. The integration of the Nomarski-microscope in the experimental setup allows for an effective evaluation of the experimental data according to the damage probability method of the ISO-standard ISO-DIS 11254-2. Microscopic inspection reveals noncumulative damage phenomena during S on 1 testing, which may prohibit the use of non-microscopic online detection techniques.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wilfried Plass and Adolf Giesen "S on 1 laser damage measurements on CO2-laser optics: defect- and stress-induced damage", Proc. SPIE 2870, Third International Workshop on Laser Beam and Optics Characterization, (20 November 1996); https://doi.org/10.1117/12.259930
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