基于光线传输矩阵理论,结合高斯光束特征参数,研究了球面镜曲率半径和腔体长度变化对环形腔子午面和弧矢面内束腰半径的影响。结果表明:两束腰半径均随曲率半径和腔体长度的增大而增大。在此基础上,分析了这种变化对环形腔内光强分布、多横模耦合和光波传输等相位面大小的影响。 Based on the theory of light transmission matrix and the characteristic parameters of Gaussian beam, the influence of spherical mirror radius of curvature and cavity length on the beam waist radius in meridian and sagittal plane of annular cavity was studied. The results show that the radius of the two beams increases with the increase of the radius of curvature and the length of the cavity. Based on this, the influence of this change on the phase intensity distribution in the annular cavity, multi-transverse mode coupling and light wave transmission is analyzed.