1 中国工程物理研究院激光聚变研究中心， 四川 绵阳 621900
2 中国科学院上海光学精密机械研究所， 上海 201800
3 中国工程物理研究院激光等离子体研究所， 上海 201800
大口径倒腔式等离子体开关是神光Ⅱ升级装置倒腔式多程放大方案的关键单元，该方案要求等离子体开关能够在极短的时间内完成工作状态的转换。采用正负开关脉冲驱动的等离子体开关响应时间较长，无法满足装置的使用要求。基于Blumlein脉冲形成线结构的高压低阻抗开关脉冲发生器能够实现倍压输出，使单一脉冲驱动等离子体开关成为可能，从而大幅减小开关响应时间。单一脉冲驱动的350 mm×350 mm口径倒腔式等离子体开关理论充电时间约为54 ns，其开关响应时间可做到小于90 ns。实验测得的等离子体开关全口径开关效率大于99.7%，静态消光比大于381，时间窗口顶宽大于160 ns，底宽小于400 ns，上述指标均满足神光II升级装置的使用要求。
光学器件 等离子体开关 单一脉冲驱动 开关特性
Author Affiliations
Abstract
1 上海激光等离子体研究所, 上海 201800
2 中国科学院上海光学精密机械研究所, 上海 201800
The Φ350 mm amplifier of No.9 laser of SHENFGUANG II demands the high gain coefficient, the good beam quality, the safety and stable running and the low cost. The gain coefficient has been raised by the improvement of pump lamps form and energy feed system, the design of Nd:glass, the suppression of the parasitic oscillation, the use of corner reflector, protective glass with sol-gel anti reflection film and high efficiency xenon lamps. The beam quality has been improved by the non-stress install of Nd:glass disks. The stable running has been enhanced by the improvement of cavity merit rating. The amplifier has been manufactured and installed. The characteristics of No.9 system have reached the design requirement.
增益系数 衍生振荡 片腔内沽净度 光束质量 gain coefficient parasitic oscillation cavity merit rating beam quality Collection Of theses on high power laser and plasma physics
2005, 3(1): 40
