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环境磁场的干扰是影响激光陀螺精度的重要因素之一.为了减小二频机械抖动激光陀螺的磁敏感性,推导了环形腔的琼斯矩阵,其中考虑了非共面角、增益介质、腔损耗、腔镜反射各向异性和应力双折射,采用矩阵本征问题求解的摄动理论分析了环形腔的偏振态和磁敏感特性.研究表明,为了减小激光陀螺的磁敏感性,应减小非共面角和腔损耗,增大腔镜的反射各向异性.腔镜应力双折射究竟会增大还是减小磁敏感性与应力作用主轴、受应力腔镜的位置有关,此外它还会引起顺时针和逆时针模式之间的偏振非互易性.磁敏感性与腔失谐近似成线性关系,导致激光陀螺工作于增益峰值时磁敏感性并非最小.这些结果对减小二频机械抖动激光陀螺的磁敏感性具有较好的指导意义.
The disturbance of environmental magnetic field is one of the important factors affecting the accuracy of laser gyroscope.In order to reduce the magnetic sensitivity of two-frequency mechanically-ditched laser gyroscope, the Jones matrix of annular cavity is deduced, in which non-coplanar angle, gain medium, cavity loss , The mirror reflection anisotropy and the stress birefringence, the polarization state and the magnetosensitive properties of the ring cavity are analyzed by the perturbation theory of solving the matrix eigenproblem. The research shows that in order to reduce the magnetosensitivity of the laser gyro, it should be reduced Non-coplanar angle and cavity loss, increase the mirror anisotropic anisotropy. Endoscopic stress birefringence will increase or decrease the magnetic sensitivity and stress spindle, by the position of the stress mirror, in addition it will Resulting in polarization non-reciprocal between clockwise and counterclockwise modes Magnetic susceptibility is approximately linearly related to detuning of the cavity, resulting in less susceptibility of the laser gyro to operating at peak gain These results are important for reducing the frequency of two- Magneto-sensitivity of the dithered laser gyro has a good guiding significance.