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利用FFT方法对环状耦合输出的90°束转非稳胜在小放大悟率（M=1．2）情况下的模场畸变进行了数值模拟，分析了镜面倾斜和像散对输出光束质量的影响程度，并与常规环形非稳腔进行了比较，结果表明，环状输出90°束转非稳腔比常规环形非稳腔具有更优良的特性。
The mode distortion of the 90 ° beam out of the ring coupled output is simulated numerically by using the FFT method under the condition of small amplification magnification (M = 1.2). The effects of specular tilt and astigmatism on the output beam quality The results show that the ring-shaped output 90 ° beam-less unstable cavity has more excellent characteristics than the conventional ring-shaped unstable cavity.