Collection Of theses on high power laser and plasma physics, 2016, 14 (1): 0714001, Published Online: Mar. 23, 2017
Fast Shape Prediction in Multi-Pass Amplifier of High Power Laser System
激光光学 多程放大 时空畸变 波形预测 功率平衡 laser optics multi-pass amplifier spatio-temporal distortion shape prediction power balance
Abstract
Three-dimensional spatio-temporal variation characteristics of pulse intensity is numerically simulated in detail in multi-pass amplifier of high power laser system. Theoretical calculation indicates that the complicated spatio-temporal distortion occurs as the pulse with specific spatio-temporal distribution passes the amplifier. This change imposes some difficulties on shaping prediction of the pulse power. The curve fitting method of input-output integral energy is proposed to achieve the inverse prediction of inject pulse shape formulti-pass amplifier system with high precision. The better prediction result is achieved not only for square pulse shape but also for multiple-steps complex pulse output, the relative power deviation reaches up to 0.032% for the square pulse output, and 0.78% for multiple-steps complex pulse output. In addition, the inverse prediction of more complicated Haan pulse is achieved. The relative power deviation is 0.13%. This method has not only high precision but also rapid computation and strong applicability.
Zhang Yanli, Zhang Junyong, You Kewei, Ma Weixin, Zhu Jian, Liu Dean, Zhu Jianqiang. Fast Shape Prediction in Multi-Pass Amplifier of High Power Laser System[J]. Collection Of theses on high power laser and plasma physics, 2016, 14(1): 0714001.