红外与激光工程, 2016, 45 (9): 0921001, 网络出版: 2016-11-14  

薄膜电极重频电光开关的热管理

Thermal management of rep-rate electro-optical switch with thin film electrode
作者单位
1 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
2 中国工程物理研究院研究生部, 北京 100088
摘要
透明导电薄膜作电极的普克尔盒电光开关是新一代重频激光驱动系统的理想单元。高重频会在电光晶体内产生热沉积, 引起弹光效应, 热光效应和晶体形变, 使透射光束的波前产生畸变。针对能量千焦耳级, 重复频率16 Hz率的激光系统, 对薄膜电极普克尔盒采用液冷技术进行热管理; 建立普克尔盒的热分析模型, 利用有限元算法, 分别研究晶体厚度和换热系数对波前畸变的影响, 得到晶体厚度的最优值。并模拟了开关晶体上的温度分布、应力分布和机械形变, 分析热光效应、机械形变和弹光效应对光束波前和退偏损耗的影响, 结合波前畸变和退偏损耗的要求得到优化的参数。
Abstract
Transparent Conductive Films(TCFs) electrode electro-optic pockels cell is an ideal switch device for high repetition rate laser system. High repetition leads to heat accumulation on the electro-optic crystal, which cause thermal-optical effect, elasto-optical effect and bulk displacement, then results in the generation of wavefront distortion. Aimed at 1 kJ output energy and 16 Hz repetition frequency laser system, the TCFs electrode pockels cell was designed using liquid cooling technology. Thermal analysis models of pockels cell were established using the finite element analysis. The influence of crystal thickness and convective heat transfer coefficient on wavefront distortion were researched, and the optimal value of crystal thickness was got. Considering the distribution of liquid flow, the thermal designed data were analyzed. Besides, the temperature, bulk dispalcement and sress distribution were simulated to get the related wavefront distortion and optimal structure value. The researched results can be used to guide the design of the repetitive frequency electro-optic switch.

庄令平, 张雄军, 张君, 郑建刚, 龙蛟, 田晓琳, 郑奎兴, 朱启华. 薄膜电极重频电光开关的热管理[J]. 红外与激光工程, 2016, 45(9): 0921001. Zhuang Lingping, Zhang Xiongjun, Zhang Jun, Zheng Jiangang, Long Jiao, Tian Xiaolin, Zheng Kuixing, Zhu Qihua. Thermal management of rep-rate electro-optical switch with thin film electrode[J]. Infrared and Laser Engineering, 2016, 45(9): 0921001.

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