边界主动加热管理平均功率普克尔盒热效应

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50J/10Hz、光束口径为50mm×30mm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500W/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。

Thermo-management of average power plasma electrode Pockels cell by heating electro-optic crystal side-face

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 impr