神光Ⅱ全链路脉冲波形的高精度反演  

High-Precision Inversion Method of Pulse Shape at SGⅡ Facility

作　　者：张军勇[1] 张艳丽[1] 马伟新[2] 朱俭[2] 刘德安[1] 杨琳[1] 朱健强[1] 林尊琪[1] 

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [2]中国工程物理研究院上海激光等离子体研究所,上海201800

出　　处：《光学学报》2015年第4期224-233,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61205212;11104296)

摘　　要：物理实验对神光Ⅱ装置的输出脉冲波形有很高的精度要求。对于单色光,通常做法是利用增益通量曲线反演激光链路获得注入波形,该方法在求解高通量或复杂波形时的精度比较差,甚至对宽带脉冲失效。针对不同输出通量,提出了智能算法和增益通量曲线的分层使用策略并应用于神光Ⅱ全链路的波形反演,混合算法的计算精度理论上取决于采样点数目。通过模拟仿真验证了混合算法具有稳定性好、精度高和收敛快的特点。The temporal shape of laser pulse is very important for most physical experiments at the SGⅡ facility.For monochrome laser, a general approach is to calculate the injected pulse shape by using gain-fluence curve（GFC）. But it doesn′t work well under the condition of high fluence or especially complex pulse shape. For different output fluences, a new hybrid algorithm, based on GFC and intelligent algorithm, is applied to solve the inversion problem of pulse shape at the SGⅡ facility. The calculation accuracy is only decided by the number of sampling points in theory. Hybrid algorithm is proved to be robust, high precision and rapid convergent by numerical calculation.

关 键 词：激光光学 逆问题 脉冲波形 多程放大 频率变换 混合算法 

分 类 号：O436[机械工程—光学工程]