中红外2μm KTA光参量振荡器的输入镜膜层损伤分析

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中红外2μm KTA光参量振荡器的输入镜膜层损伤分析
王鹏[1,2] 李彤[2] 朱建华[1] 牛瑞华[2] 朱雅琛[2][1]四川大学物理科学与技术学院,成都610064 [2]西南技术物理研究所,成都610041摘要：对基于KTA（KTiOAsO4，砷酸钛氧钾）晶体的中红外2μm光参量振荡器的输入镜膜层损伤现象进行了初步分析及对比实验研究，表明薄膜缺陷导致的热效应是造成输入镜膜层损伤、抗损伤阈值低的主要原因，同时发现由于腔镜失调等原因造成的腔内残余1．06μm激光是造成膜层损伤的主要来源，这些结果对改进光参量振荡器系统设计、进一步提高2μm激光输出能量具有一定的指导作用。

' M  ?2 x3 o0 R+ _KeyWord：Middle infrared laser; KTA crystal; Optical parametric oscillator; Coating damage

关键词：中红外激光器 KTA晶体 光参量振荡器 薄膜损伤
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分类号：O484.4[著者标引]文献标识码：A文章编号：1004-5929（2008）01-0060-05
Analysis on the Optical Coating Damage of Input Mirror of Middle Infrared 2 μm KTA Optical Parametric Oscillator WANG Peng, LI Tong, ZHU Jian - hua, NIU Rui - hua, ZHU Ya- chen 1. Department of Physics, Sichuan University, Chengdu 610064, China; 2. Southwest Institute of Technology Physics, Chengdu 610041, China
Abstract：The optical coating damage of input mirror of middle infrared 2 μm KTA optical parametric oscillator is analyzed preliminarily, and the comparative experiments are performed to identify its cause. It shows that thermal effect induced by optical coating defect is the main reason for the low anti - damage threshold of input mirror coating. Meanwhile, it also shows that the main source of coating damage is remnant 1.06μm laser in the resonant cavity caused by the mis- adjustment of cavity mirrors. These results are useful for improving the design of optical parametric oscillator system and increasing its output energy.
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% z' B8 k3 q8 `' K6 X4 [- nKeyWord：Middle infrared laser; KTA crystal; Optical parametric oscillator; Coating damage

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