高功率激光多程放大器的三维反演方法  

Three-Dimensional Inversion Method for High Power Laser Multi-Pass Amplifier

作　　者：管相合 张艳丽[1] 张军勇[1] 朱健强[1] Guan Xianghe;Zhang Yanli;Zhang Junyong;Zhu Jianqiang(Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences, Shanghai 201800, China;University of Chinese Academy of Sciences, Beijing 100049, China)

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重点实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《光学学报》2018年第5期164-170,共7页Acta Optica Sinica

基　　金：国家国际科技合作专项(2010DFB70490)

摘　　要：针对高功率激光多程放大的三维反演问题,提出了基于修正增益迭代算法结合输入输出积分能量曲线法和基于修正输入脉冲的正向迭代算法。利用这两种方法对有增益分布的四程放大进行数值模拟验证,计算结果表明这两种迭代算法都是有效可行的,都可得到输入脉冲时空分离的三维强度分布。计算所得输出脉冲与需求值基本相同,输出能量的相对偏差小于10^(-7),第一种方法功率波形的相对偏差小于1%,第二种方法功率波形的相对偏差小于10^(-6),很好地解决了由放大饱和效应引起的时空演化畸变。第一种方法主要依靠正逆模型的自洽性,相对直观;第二种迭代算法引入反馈因子,所得结果的精度较高、拓展性强。Aiming at the three-dimensional inversion problem of high power laser multi-pass amplification,we propose two inversion methods.The first method is a modified gain iterative algorithm based on the curve fitting method of input-output integral energy.The second method is a forward iterative algorithm based on the modified input pulse.In the four-pass amplification with gain distribution,the two methods are verified by numerical simulation.The results show that the two iterative algorithms are effective and feasible,and the three-dimensional intensity distribution of spatio-temporal separation of input pulse can be obtained.The calculated output pulse is basically the same as the demanded value.The relative deviation of the output energy is less than 10^-7.The relative deviation of the power waveform obtained by the first method is less than 1%,and this value is less than 10^-6 for the second method.The spatio-temporal evolution distortion caused by the saturation effect is solved.The first method relies mainly on the consistency of the forward and inverse model,which is relatively straightforward.The second iterative algorithm introduces a feedback factor,and has high precision and strong expansibility.

关 键 词：激光光学 多程放大 波形反演 增益修正 输入修正 三维分布 

分 类 号：TN249[电子电信—物理电子学]