高能重复频率运转条件下等离子体普克尔盒热效应及其控制理论分析  

Numerical Studying of the Thermo-Effects and Its Management in Plasma Pockels Cell for High-Energy RF Laser Systems

作　　者：张君[1] 张雄军[1] 吴登生[1] 田晓琳[1] 郑建刚[1] 段文涛[1] 李明中[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《中国激光》2011年第1期33-37,共5页Chinese Journal of Lasers

摘　　要：在高能重复频率运转的激光系统中,用作激光隔离、多程放大控制的关键单元普克尔盒遇到了通光口径限制与热效应的双重挑战。采用等离子体电极技术将普克尔盒定标到大口径,通过选择吸收系数小且通光方向薄的KD*P作为电光晶体以减少对激光的吸收,并在此基础上数值分析了等离子体普克尔盒的热效应。提出了端面传导冷却电光晶体的热管理方法,并进行优化设计。数值模拟结果显示,采用单块白宝石传导冷却2块KD*P,普克尔盒的驱动电压可降低至27 kV。在平均功率密度35 W/cm2的激光持续辐照下,端面传导冷却的40 mm×40 mm口径等离子体普克尔盒全口径内最大退偏损耗为0.22%,波前峰谷(PV)值为0.60λ。In high average power laser system, electro-optic switches encounter both limitation of aperture and thermo-effects. Plasma-electrodes technology is adopted to scale the switch to large aperture, and thin KD· P is used as electro-optic crystal to reduce absorption of the laser. Based on analyzing themo-effects, a mean of end-face conduction-cooling the KD·P is arised, and optimum design is done. Numerical simulation results show that, by adopting one piece of sapphire to cool two pieces of KD· P, the required switch-voltage could be reducd to 27 kV. For 35 W/cm2 average power density laser, the maximum depolarization in the end-face conduction-cooled switch, which has a 40 mm× 40 mm aperture, is 0.22%, and the peak to valley（PV） value is 0.60 λ. These perturbations are acceptable to meet the design requirements.

关 键 词：光学器件 电光开关 重复频率 热效应 热管理 

分 类 号：TN248.1[电子电信—物理电子学]