【摘要】 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。更多还原

【Abstract】 An annulaur output ring unstable resonator with 90° beam rotation with abrrationat a situation of low magnification M = 1. 2 is calculated by the fast Fourier transformmethod. The in flunce of the quality of the output beam with tilt and astigmatism isanalized. The results indicate that this new resonator is better than a nomal ring unstableresonator.更多还原