针对光学元件参数存在随机误差的多光束高功率固体激光驱动器,利用概率与统计的方法模拟计算了9-6排布四程放大系统输出时间宽度为1ns和13ns的平顶脉冲时主放大器输出的基频光的能量离散情况。计算结果表明,当激光脉冲工作在介质的线性放大区时,输出脉冲的能量离散度较大；而当激光脉冲工作在介质的深度饱和区时,输出脉冲的能量离散度较小。利用放大器的这一性质,可以通过增加注入能量的方法使激光器工作在深度饱和状态,从而减小输出脉冲的能量离散度。

Based on the theory of probabili ty and statistics, the energy instability which caused by the random error from o ptical parameters of multi beam high power solid laser was calculated in this p aper. The simulation prototype has been founded on the dozens of four pass ampl ifiers. The energy spread was evaluated for the amplifiers which output 1ns and 1 3ns flat in time laser pulses. As a result, the energy spread of outputing pul ses for 1ns pulses was bigger than that for 13ns pulses at the same conditions. Because for 13ns pulses, the amplifiers have been forced to work at deep gain sa turation state; but for 1ns pulses, the amplifiers have been worked at linear am plification state. Using this characteristic of amplifiers, the energy spread of multi beam lasers could be reduced by increasing the energy of input pulses to force the amplifiers working at deep gain saturation state.