高功率激光放大器反激光能流分布的模拟  

Simulation analysis for backward-reflected laser in high power laser amplifier

作　　者：李林波[1,2] 卢兴强[1] 曹华保[1] 李正宏[2] 徐荣昆[2] 杨建伦[2] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800 [2]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《强激光与粒子束》2010年第2期261-264,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(60707019;10635050)

摘　　要：从Frantz-Nodvik模型出发,采用包含弛豫作用的速率方程组,将放大器对反激光的放大当作多程放大处理,模拟计算了光路中反激光的能流分布。光路为钕玻璃放大系统,激光脉宽1.0 ns,输出能量2.5kJ。放大器剩余增益的较大差异导致光路中各个元件反激光能流密度分布显著不同。与使用1级φ70 mm棒状放大器相比,采用2级φ70 mm棒状放大器时反激光能流相对集中,具有潜在的破坏危险。Based on the Frantz-Nodvik physical model, the energy fluence of backward-reflected laser in a high power laser amplifier has been investigated by solving the rate equations in consideration of relaxation between lower and upper laser states. The laser chain is composed of Nd-doped phosphate glass amplifiers that can provide 2.50 kJ with the pulse duration of 1.0 ns. Due to the considerable difference of remaining gain in laser amplifiers, the energy fluence is significantly different. Compared with that utilizing one amplifier with the diameter of 70 mm, the laser chain including two may take a bigger risk of being destroyed.

关 键 词：高功率激光放大器 反激光 能流密度 数值模拟 

分 类 号：TN242[电子电信—物理电子学]