口径可定标放大的重频电光开关技术研究

项目名称： 口径可定标放大的重频电光开关技术研究

项目编号： No.61308039

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 张君

作者单位： 中国工程物理研究院激光聚变研究中心

项目金额： 26万元

中文摘要： 用来控制放大程数、抑制自激振荡的光开关是多程放大系统的核心器件。在高能重频运转条件下，开关不仅应有较快的上升沿、可定标到大口径，同时还需承受数十W/cm2的平均功率密度激光辐照。探索满足以上需求的开关技术基础将为高能重频激光器的发展提供有力的技术支撑。等离子体电极电光开关技术是目前唯一能够定标到大口径的开关技术，同时可采用薄晶体以减少对主激光吸收产生的热效应。但由于晶体两侧放电腔内气压低，晶体吸收激光产生的热量不能被有效地带走，而光开关为热敏感器件，较低的热沉积即可引起严重的退偏和波前畸变、甚至热应力导致晶体碎裂。基于此，提出了"反射式等离子体电极电光开关"概念。将对开关的热效应及其控制、介质阻挡大面积气体重频放电、开关单脉冲驱动等技术基础进行研究，并建立相应的实验研究平台，考核高能重频激光负载下开关性能，并校正所建立的理论模型和开发的计算程序。从而为该开关技术实际应用提供理论和实验依据。

中文关键词： 电光开关；高能；重频；隔离；多程放大

英文摘要： An optical switch is a key device which is used to supress self-excitation and to control the number of passes that laser-pulses train make through the amplifier cavity. For repetition-rate and high energy laser system application, this device should be fast response, aperture scalable, and hold tens W/cm2 average power density laser irradiation. By now, the plasma-electrodes Pockels cell (PEPC) optical switch technology is the unique technology that meets the required aperture challenge. This PEPC switch can adopt thin crystal to mitigate thermo-effects by reducing absorption of laser. However, an optical switch is a thermo-sensitive device, a small quantity of thermo-deposition could lead to serius depolarization, wave-front distortion, and even stress fracture in the crystal. Based on this, the concept of reflective plasma-electrodes electro-optic switch is comed up with. Some key technoloyies, such as thermo-effects and its management, repetition-rate gas discharge in a large area, switch driving technology, and so on, will be studied. In addition, an experiment bench will be set up to examine switch performances under repetition-rate and high-energy laser load, and to correct the theory model as well as computing program. Consequently, both theroy and experiment groundworks are laid for this switch technol

英文关键词： electro-optical switch；high energy；repetition-rate；isolation；multipass amplifier