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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。
The Pockels cell electro-optic switch with transparent conductive film as the electrode is the ideal unit for the new generation of repetition frequency laser drive system. High-repetition frequency will generate heat deposition in the electro-optic crystal, causing the pop-up effect, thermo-optic effect and crystal distortion, which distorts the wavefront of the transmitted beam. Aiming at the laser system with kilojoule energy and repetition rate of 16 Hz, the Pokell box was thermally controlled by liquid-cooling technique. The thermal analysis model of Pockels box was established. By using the finite element method, the crystal thickness and Heat transfer coefficient on the wavefront distortion, the optimal value of the crystal thickness. The effects of thermo-optic effect, mechanical deformation and pop-up effect on the wavefront and depolarization loss of the beam were analyzed. The optimization of the wavefront distortion and the depolarization loss was optimized The parameters.