Progresses in research on laser damage mechanisms and contamination problems

Progresses in research on laser damage mechanisms and contamination problems
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激光损伤机制及污染问题研究进展

DOI：
10.1117/12.2073663
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发表时间：
2014
期刊：
Proc SPIE
影响因子：
--
通讯作者：
and H. Azechi
and H. Azechi
中科院分区：
--
文献类型：
--
作者：
T. Jitsuno;H. Murakami;K. Kato;E. Sato;K. Mikami;S. Motokoshi;N. Miyanaga;and H. Azechi

文献摘要

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在高功率激光系统中，光学薄膜的激光损伤阈值（LIDT）是获得高性能的重要参数。最近，LIDT被发现有很强的温度依赖性，在本体，基板的表面，并在涂层。这些温度依赖性的LIDT进行了仔细的测量，并建立了损伤形成模型关于这种温度依赖性。为了解释LIDT的温度依赖性，考虑了雪崩过程中初始电子产生和电子倍增的温度依赖性。另一方面，光学镀膜中的LIDT对储存和使用过程中沉积在镀膜层中的有机污染物非常敏感。本文还介绍了激光聚变一次点火方案中LFEX激光系统的油污染问题。我们分析了污染物并评估了污染的影响。我们还开发了新的清洁方法来去除涂层中的污染物，并且我们成功地防止了LIDT在真空室中使用硅胶进行抽空期间的降解。对LIDT的污染进行了定量分析。我们研究了几种材料在受控污染下介质涂层的LIDT特性。
In high power laser systems, the laser-induced damage threshold (LIDT) in optical coating is very important parameters for obtaining high performances. Recently, LIDT was found to have strong temperature dependences in the bulk, surface of substrates, and in coatings. These temperature dependences of LIDT were carefully measured, and the damage formation model was constructed regarding to this temperature dependence. To explain this temperature dependence of LIDT, the temperature dependences of the initial electron generation and electron multiplication in the avalanche process were taken into account. On the other hand, LIDT in optical coating is very sensitive to organic contaminations accumulated in coating layers during storage and using condition. This paper also introduces the oil-contamination problem in LFEX laser system for First Ignition scheme in the laser fusion. We have analyzed contaminants and evaluated the effects of the contamination. We also developed new cleaning methods to remove contamination from the coating, and we have succeeded to prevent the degradation in LIDT for the duration of evacuation with Silica-gel in the chamber. The quantitative analysis of contamination on LIDT was made. We have investigated the characteristics of LIDT in dielectric coatings under the controlled contamination with several materials.