激光技术, 2010, 34 (3): 392, 网络出版: 2010-08-31   

液晶光学器件激光损伤研究

Research of laser damage on liquid crystal optical elements
作者单位
中国工程物理研究院流体物理研究所,绵阳 621900
摘要
为了实现液晶光学器件在高功率固体脉冲激光装置上的应用,采用理论模拟和实验相结合的方法研究了液晶光学器件的激光损伤情况,建立了液晶光学器件激光损伤的物理模型,计算了一定入射激光能量密度下液晶光学器件的温度场分布和损伤情况,测量了液晶光学器件中聚酰亚胺薄膜和液晶材料的激光损伤阈值,得到了液晶光学器件的激光损伤机理和损伤阈值。结果表明,液晶光学器件的激光损伤主要源于组成液晶光学器件的聚酰亚胺薄膜和液晶材料因温度升高导致的破坏,通过液晶光学器件结构的合理设计和物理参量的选择可以提高其抗激光损伤能力。
Abstract
In order to apply liquid crystal optical elements in high power solid pulsed laser facility, the laser damage on liquid crystal optical elements was studied based on simulation and experiments. The physical mode of laser thermal damage on liquid crystal optical elements was built and temperature distribution was calculated at certain incident laser energy density, the laser damage threshold of the polyimide film and liquid crystal material were measured and the laser damage mechanism and threshold of the liquid crystal optical elements were attained. The results indicate that laser damage on the liquid crystal optical elements mainly origin from the decomposition of liquid crystal material and polyimide film under the laser induced high temperature conditions, the laser damage threshold could be improved through optimizing their structural and physical parameters.

骆永全, 张大勇, 张翠娟, 罗飞, 沈志学, 刘海涛. 液晶光学器件激光损伤研究[J]. 激光技术, 2010, 34(3): 392. LUO Yong-quan, ZHANG Da-yong, ZHANG Cui-juan, LUO Fei, SHEN Zhi-xue, LIU Hai-tao. Research of laser damage on liquid crystal optical elements[J]. Laser Technology, 2010, 34(3): 392.

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