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提出一种适合于高功率超音速横流氧碘化学激光器的环状输出的ＵＲ９０束转非稳腔，采用ＦＦＴ方法模拟了具有非均匀分布的小信号增益时最低阶模的光场强度分布。利用大口径铜蒸汽激光器，通过实验研究了在放大倍率为１．２１和１．１３的情况下，环状输出ＵＲ９０腔正向模与反向模的基本特性，得到较好的实验结果。
A UR90 beam-steering unstable cavity suitable for high-power supersonic transverse-flow oxygen-iodine chemical lasers is proposed. The intensity distribution of the lowest-order mode field is simulated by using FFT method with small signal gain with non-uniform distribution. The large diameter copper vapor laser was used to study the basic characteristics of the positive and negative modes of UR90 cavity ring at magnifications of 1.21 and 1.13, and the better experimental results were obtained.