调Q激光自触发斩波产生纳秒脉宽单脉冲激光

为利用现有装备简单获得纳秒脉宽、峰值较高的单脉冲激光,满足**应用和高温等离子体干涉研究的时间分辨要求,采用专利技术优化了调Q脉冲激光自斩波KDP泡克耳斯盒电光开关的触发狭隙,解决了19 kV全波电压下静态绝缘阻断和调Q激光脉冲前沿低阈值击穿双重可靠以及全系统动作同步,确保了触发的快捷和峰值附近斩波,实现了从传统红宝石激光器脉宽30 ns,能量80 mJ的调Q激光脉冲中斩出1.7 ns,4 mJ的单脉冲激光。实验和分析表明,预处理崎化了开关电极间的场分布,强化了激光触发作用,保证了斩出脉冲的窄脉宽和高峰值。

Abstract

For obtaining simple mono-pulse laser of nanosecond burst-length and high peak power with available equipments in order to satisfy time-resolved demands in something to do with military application and in interferometric research of high temperature plasma, the trigged gap of KDP Pockels cell for chopping Q-beam itself was optimized by using certain patent technique, the dilemmas of dual reliability as well as synchronism of whole system were overcome in both static electric-separating of the gap enduring at full-wave voltage (Vλ) of 19 kV and easily puncturing of the insulating film between gap′s electrodes by the low front of Q-beam self-triggering, the high-speed triggering and the chopping near the peak of Q-beam were guaranteed, and a mono-pulse laser of 1.7 ns burst-length with 4 mJ pulse energy cut apart from Q-beam of a 30 ns/80 mJ traditional ruby laser was realized. Experimental investigation and theoretical analysis indicate, the optimized pre-processing distorted the distribution of the electric field between gap′s electrodes, strengthened the effect of the Q-beam′s triggering, and ensured the chopped laser pulse with short duration and high power.

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董小刚, 李良钰, 晏思贤. 调Q激光自触发斩波产生纳秒脉宽单脉冲激光[J]. 中国激光, 2007, 34(4): 465. 董小刚, 李良钰, 晏思贤. Producing Mono-Pulse Laser of Nanosecond Burst-Length by Cutting-Apart from Q-Beam Self-Triggered[J]. Chinese Journal of Lasers, 2007, 34(4): 465.

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