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
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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 impr
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Key words:
- pockels cell /
- thermo-management /
- simulation /
- depolarization /
- wave-front distortion
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