为了改善四频差动激光陀螺环形腔内光束的传输质量, 基于差分损耗理论, 结合数理统计方法, 研究了石英晶体光轴失配角和旋光角变化对环形腔内左、右旋光场偏振态的影响, 分别探究了差分损耗在各自集合内均方根、取值范围和方差的变化规律。结果表明: 为了达到理想的左、右旋对称性偏振光和稳定的腔结构, 光轴失配角需接近0°, 旋光角也只能在90°附近波动。差分损耗统计参量的不同限定值也为激光陀螺腔结构稳定性的定量描述提供了依据。

To improve the transmission quality of four frequency differential laser gyro beam in ring cavity, based on loss difference theory and by combining with mathematical statistics, the effects of the changes of optical axis mismatch angle and optical rotatory angle of quartz crystal on the left and right light field polarization in ring cavity were studied, including the variation laws of difference loss in RMS value, variation range and variance in each collection. The results show that, the optical axis mismatch angle needs to approach 0°, and the optical rotatory angle also need be around 90° in order to achieve ideal polarized light with left and right symmetry and stable laser gyro cavity structure. The limit values of each statistical parameter of the difference loss can provide a quantitative description for the stability of the laser gyro cavity structure.