强激光与粒子束, 2010, 22 (9): 1977, 网络出版: 2010-09-21  

边界主动加热管理平均功率普克尔盒热效应

Thermo-management of average power plasma electrode Pockels cell by heating electro-optic crystal side-face
作者单位
中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
摘要
建立了平均功率激光辐照下,边界主动加热的电光晶体内3维各向异性热传输有限元模型及其热应力双折射模型,在此基础上分析了等离子体普克尔盒热效应。提出了边界主动加热控制电光晶体横向温度梯度热管理思想,并给出平均功率普克尔盒的光开关性能。结果表明:对于50 J/10 Hz、光束口径为50 mm×30 mm的激光系统,普克尔盒最大退偏损耗为3.58%,平均退偏损耗为0.9%,波前畸变为1.59λ。采用边界加热控制后,当加热功率密度为500 W/m2时,最大退偏损耗为0.17%、平均退偏损耗为0.05%、波前畸变为0.26λ,普克尔盒热效应显著降低,满足设计要求。
Abstract
Three-dimension heat transfer finite-element model in electro-optic crystal, which is orthotropic and actively heated by resistance wire, is established. Based on the model, thermo-effects are analyzed in the plasma electrodes Pockels cell. A thermo-management idea is put forward and the optical switch performance is studied in the average power Pockels cell. The results are as follows: for 50 J/10 Hz laser system with 50 mm×30 mm light beam aperture, the maximum depolarization is 3.58%, the average depolarization is 0.90 %, and PV is 1.59λ; With 500 W/m2 resistance wire heating the edge of the electro-optic crystal, the maximum depolarization of the Pockels cell reduces to 0.17%, the average depolarization is 0.05%, and PV decreases to 0.26λ. The performance of the Pockels cell is improved significantly, and meets the designing requirements.

张君, 张雄军, 吴登生, 田晓琳, 蒋新颖, 段文涛, 李明中. 边界主动加热管理平均功率普克尔盒热效应[J]. 强激光与粒子束, 2010, 22(9): 1977. Zhang Jun, Zhang Xiongjun, Wu Dengsheng, Tian Xiaolin, Jiang Xinying, Duan Wentao, Li Mingzhong. Thermo-management of average power plasma electrode Pockels cell by heating electro-optic crystal side-face[J]. High Power Laser and Particle Beams, 2010, 22(9): 1977.

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