理论分析了四频差动激光陀螺中由于镜片的Ｓ－Ｐ相位和Ｑ的各向异性及光束不过水晶片光轴等因素所引起的左、右旋偏振模式间的差分损耗。这种差分损耗会导致激光陀螺中零漂的形成。这一问题的研究对陀螺性能的改进具有重要的参考价值 Theoretical analysis of the differential loss in the quadrupole differential laser gyroscope due to the S-P phase of the lens and the anisotropy of Q, and the optical axis of the beam but not the crystal axis of the crystal, has been theoretically analyzed. This differential loss causes zero drift in the laser gyro. The research on this issue has important reference value for the improvement of gyro performance