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分析了ＵＲ９０环形非稳腔（ＵｎｓｔａｂｌｅＲｅｓｏｎａｔｏｒｓｗｉｔｈ９０°ＢｅａｍＲｏｔａｔｉｏｎ）正向模和反向模的几何特性，讨论了反向模无阻挡时的振荡条件，并导出了理想ＵＲ９０环形非稳腔的光线追述方程，考查了此腔对激光增益介质的空间自平均效应。
The geometric characteristics of the positive mode and the negative mode of the UR90 annular unstable cavity are analyzed. The oscillation conditions of the non-blocking reverse mode are discussed, and the ray tracing equation of the ideal UR90 annular unstable cavity is derived. The spatial self-averaging effect of this cavity on the laser gain medium.