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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 the laser system operating at high energy repetition rate, the Pokell box, which is used as the key unit of laser isolation and multi-path amplification control, meets the dual challenge of the aperture limitation and the thermal effect. The Pockels cell was calibrated to a large aperture by using the plasma electrode technology. By selecting KD * P with small absorption coefficient and thin light direction as the electro-optic crystal to reduce the absorption of laser light, the plasma was analyzed numerically Pokol box thermal effect. The thermal management method of end-conduction cooled electro-optic crystal is proposed and optimized. The numerical simulation results show that the drive voltage of Pockels cell can be reduced to 27 kV by cooling two KD * P monolithic white stones. Under continuous laser irradiation with an average power density of 35 W / cm2, the maximum depolarization loss in the full aperture of a 40 mm × 40 mm aperture Pockels cell with end conduction cooling was 0.22%. The wavefront peak (PV) value Is 0.60λ.