用矩阵方法导出了UR90(Unstable ring resonator with 90° beam rotation)环形非稳腔的衍射积分方程,获得了腔的等价菲涅耳数Neq的关系公式,分析了反向模的抑制方法并给出反向模抑制镜的曲率半径,通过数值计算的方法阐明了腔模本征值与放大因子M的变化关系,当腔的放大因子Ｍ=1.2时,得到了腔的模场分布曲线。

A diffraction integral equation for unstable ring resonators with 90° beam rotation is derived using matrix method. A formulation of the equivalent Frensel number for the resonator is obtained. Methods for suppressing the reverse mode are analyzed, and the radius of curvature of the reverse wave suppressor mirror is gaven. Relationship between eigenvalues of the resonator modes and variant magnification factor M is demonstrated by numerical calculations. Mode-fields idstribution curves of a resonator are presented with the magnificationf actor M as 1.2.