利用ABCD传输矩阵对多片串接正支非稳腔进行分析，给出了谐振腔最优参数，并利用谐振腔自再现条件计算不同薄片上的振荡光束尺寸，根据理想谐振腔阈值条件，得到谐振腔的输出能量。针对上述分析进行了实验验证，在非稳腔放大率为2.0、重复频率为25 Hz、脉宽为250 μs的条件下，输出单脉冲能量为10.52 J，斜效率为22.75%，实验结果与理论设计基本吻合。

Using the method of ABCD transmission matrix to analyze the positive-branch unstable resonator which consists of multi thin disks, appropriate resonator parameters are got. The self-repeat of resonator is used to calculate oscillation beam size in different disks. The basis of ideal resonator′s threshold gives out the max output energy. Experiment has been carried to verify the analyze, finally we get 10.52 J output laser every single pulse, the magnification is 2.0, the frequency is 25 Hz, the oblique efficiency is 22.75%, the experimental results and the theoretical are totally conformed.