光学学报, 2010, 30 (4): 1051, 网络出版: 2010-04-20   

神光Ⅲ原型装置初步的激光脉冲整形实验

Preliminary Laser-Pulse-Shaping Experiment on Technical Integration Line
作者单位
中国工程物理研究院激光聚变研究中心,四川 绵阳 621900
摘要
针对物理实验要求的三台阶整形脉冲(脉冲宽度比为1.5 ns:1 ns:0.5 ns,幅度比为1:4:16),在神光Ⅲ原型(TIL)装置上开展了脉冲时间波形整形实验研究。首先,针对发射目标利用激光性能仿真模型预测注入激光系统的激光能量和脉冲波形。然后,在脉冲整形后进行不同功率的激光发射对脉冲波形进一步修正:利用实验测量的频率转换效率修正各光束1ω能量和1ω脉冲波形;通过拟合实验测量的能量数据修正注入激光能量;通过增益-通量曲线修正注入激光脉冲波形。最后,将各束注入脉冲波形再次折中作为脉冲波形调整的最终依据。实验结果表明,对靶面要求的3ω-3 ns-0.5 kJ(单束)的三台阶整形脉冲,8束脉冲波形与要求比较一致;三个台阶的束间瞬时均方根功率不平衡分别约为30%,10%和5%。
Abstract
To meet three-step 3ω temporally shaped pulse (the pulse-width ratio of three steps is 1.5 ns:1 ns:0.5 ns and the amplitude ratio is 1:4:16) required by phgsics experiment,preliminary laser-pulse-shaping experiment is performed on technical integration line (TIL). Firstly,laser energy and pulse shape of the injection laser system (pre-amplification system) are primarily predicted to tune out systematic differences among the eight beams by laser performance simulation model according to the shot mission and previous data.Secondly,several laser shots at different laser power are done to further modify the pulse shape:1ω energy and 1ω pulse are corrected by the experimental frequency conversion efficiency for every beam,The injection laser energy by fitting experimental input and output energy data,and the injection pulse shape by gain-fluence curve based on the above corrected 1ω pulse and 1ω energy. Finally,all the injection pulses are compromised again for the final pulse shaping. The experimental 8-beam three-step pulses of 3ω at target are comparatively consistent with the requirement. For 3ω-3 ns-0.5 kJ (single-beam) pulse,the three-step beam-to-beam instantaneous root mean square (rms) power imbalance are about 30%,10% and 5%,respectively.

王文义, 赵润昌, 粟敬钦, 李海, 梁樾, 莫磊, 王方, 刘兰琴, 孙志红, 朱启华, 景峰. 神光Ⅲ原型装置初步的激光脉冲整形实验[J]. 光学学报, 2010, 30(4): 1051. Wang Wenyi, Zhao Runchang, Su Jingqin, Li Hai, Liang Yue, Mo Lei, Wang Fang, Liu Lanqin, Sun Zhihong, Zhu Qihua, Jing Feng. Preliminary Laser-Pulse-Shaping Experiment on Technical Integration Line[J]. Acta Optica Sinica, 2010, 30(4): 1051.

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