Collection Of theses on high power laser and plasma physics, 2014, 12 (1): 0702005, Published Online: May. 27, 2017
Study of Simulation and Experiment of the Prompt Pump-Induced Wavefront of the Four-Pass Amplification High Power Laser Facility
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 laser optics prompt pump-induced wavefront laser facility four-pass amplification wavefront compensation thermal recovery wavefront
Abstract
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 ShenGuang Ⅱ four-pass amplification high power laser facility (SG-Ⅱ-FAF), numerical simulation is conducted on the prompt pump-induced 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 Ndglass 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.
Tang Shiwang, Zhu Haidong, Guo Ailin, Xie Xinglong, Zhu Jianqiang, Ma Weixin. Study of Simulation and Experiment of the Prompt Pump-Induced Wavefront of the Four-Pass Amplification High Power Laser Facility[J]. Collection Of theses on high power laser and plasma physics, 2014, 12(1): 0702005.