四程放大高功率激光驱动器动态波前模拟与实验研究  

Study of Simulation and Experiment of the Prompt Pump-Induced Wavefront of the Four-Pass Amplification High Power Laser Facility

作　　者：唐仕旺[1,2] 朱海东[1,2] 郭爱林[1] 谢兴龙[1] 朱健强[1] 马伟新[3] 

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]中国科学院大学,北京100049 [3]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：《中国激光》2014年第7期33-41,共9页Chinese Journal of Lasers

基　　金：国家863计划(2012AA8044010);高功率激光物理联合实验室研究发展基金

摘　　要：高功率激光驱动器动态波前特征及其规律是激光驱动器光束波前质量控制关键研究内容之一。以神光Ⅱ四程放大高功率激光驱动器为研究平台,使用ANSYS和Matlab对激光驱动器瞬时动态波前进行了模拟计算,并利用哈特曼波前分析仪对驱动器氙灯抽运引入的瞬时动态像差和热恢复像差进行了实验研究,得到其时空特性和变化规律。理论模拟和实验结果具有一致性,单片片状放大器动态像差峰谷(PV)值约为0.12λ(波长λ=1053nm),驱动器总体瞬时动态像差PV值约为5λ,呈"瓦片"形态。模拟计算和实验分析为神光Ⅱ四程放大高功率激光驱动器光束波前质量控制、激光发射顺利通过空间滤波器和片状放大器抽运均匀性优化等提供了重要的参考数据,提升了输出光束远场焦斑能量集中度,提高了驱动器激光发射的成功率和运行效率。The prompt pump-induced wavefront characteristic of high power laser facility is undertaken to address an important aspect of the wavefront control system for the high power laser facility.Based on the ShenGuangⅡfourpass amplification high power laser facility（SG-Ⅱ-FAF）,numerical simulation is conducted on the prompt pumpinduced wavefront distortion through ANSYS and Matlab.In order to obtain the space-time characteristics and variation features,the Hartmann wavefront analyzer is employed to conduct experiments on prompt pump-induced wavefront distortion and thermal wavefront recovery aberration after xenon lamp pumping.The numerical simulation results agree well with experimental results.The prompt pump-induced wavefront distortion of single-slab-amplifier is about 0.12λ（wavelength λ=1053 nm）of peak-to-valley（PV）,and the whole optical wavefront of the SG-Ⅱ-FAF is about 5λ of PV with different laser beams,whose shape looks like a＂saddle＂.Simulations and experiments provide important data for the wavefront control system of SG-Ⅱ-FAF,emission laser passing through the space filters sucessfully and pumping uniformity of slab Nd：glass amplifier.As a result,the far-field focus spot energy concentration of the laser beam is improved,meanwhile the success rate and the working efficiency of the SG-Ⅱ-FAF operational experiment are increased.

关 键 词：激光光学 动态波前 激光驱动器 四程放大 波前补偿 热恢复过程 

分 类 号：O436[机械工程—光学工程]