Optical damage observed in the LHMEL II output coupler

John J. Eric, John O. Bagford, C. Devlin, R. Hull, Daniel B. Seibert
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Abstract

During the annual NIST calibration testing done at the LHMEL facility in FY06 on its high energy Carbon-Dioxide lasers, the LHMEL II device suffered severe damage to the internal surface of its ZnSe output coupler optics. The damage occurred during a high power, short duration run and it was believed to have been the result of a significant amount of surface contaminants interacting with the LHMEL cavity beam. Initial theories as to the source of the contamination led to the inspection of the vacuum grease that seals the piping that supplies the source gases to the laser cavity. Other contamination sources were considered, and analysis was conducted in an effort to identify the material found at the damage sites on the optic, but the tests were mainly inconclusive. Some procedure changes were initiated to identify possible contamination before high energy laser operation in an attempt to mitigate and possibly prevent the continued occurrence of damage to the output coupler window. This paper is to illustrate the type and extent of the damage encountered, highlight some of the theories as to the contamination source, and serve as a notice as to the severity and consequences of damage that is possible even due to small amounts of foreign material in a high energy laser environment.
在LHMEL II输出耦合器中观察到光学损伤
在2006财年在LHMEL设施对其高能二氧化碳激光器进行的年度NIST校准测试中,LHMEL II设备的ZnSe输出耦合器光学器件的内表面遭受了严重的损坏。损坏发生在高功率、短时间运行期间,据信是大量表面污染物与LHMEL腔束相互作用的结果。关于污染来源的初步理论导致了对密封管道的真空油脂的检查,该管道向激光腔提供源气体。还考虑了其他污染源,并进行了分析,以确定在光学器件损坏部位发现的材料,但测试基本上没有定论。为了在高能激光操作之前识别可能的污染,开始了一些程序更改,以减轻和可能防止继续发生对输出耦合器窗口的损坏。本文旨在说明所遇到的损伤的类型和程度,突出一些关于污染源的理论,并作为在高能激光环境中即使由于少量外来物质也可能造成损伤的严重性和后果的通知。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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