CAJ | 학술논문

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.
배경자장적간우시영향격광타라정도적중요인소지일.위료감소이빈궤계두동격광타라적자민감성,추도료배형강적경사구진,기중고필료비공면각、증익개질、강손모、강경반사각향이성화응력쌍절사,채용구진본정문제구해적섭동이론분석료배형강적편진태화자민감특성.연구표명,위료감소격광타라적자민감성,응감소비공면각화강손모,증대강경적반사각향이성.강경응력쌍절사구경회증대환시감소자민감성여응력작용주축、수응력강경적위치유관,차외타환회인기순시침화역시침모식지간적편진비호역성.자민감성여강실해근사성선성관계,도치격광타라공작우증익봉치시자민감성병비최소.저사결과대감소이빈궤계두동격광타라적자민감성구유교호적지도의의.
Disturbance by ambient magnetic field is an important factor, which leads to measurement error of the laser gyro. In order to reduce the magnetic sensitivity, the polarization eigenstate in ring cavity is analyzed with matrix perturbation method, considering factors of small nonplanarity, mirror anisotropy and stress birefringence, gain and so on. The main factors affecting the magnetic sensitivity of the laser gyro are discussed. Ellipticities of eigen modes in clockwise and anti-clockwise direction caused by nonplanarity are identical and both are proportional to magnetic sensitivity. The influence of stress birefringence on ellipticity is related to mirror position, propagating direction of eigenmodes and main axis of stress. Nonplanarity is zero when ellipticities of eigen modes in clockwise and anti-clockwise direction are equal without stress birefringence in the passive cavity. A lower cavity loss is better to reduce the magnetic sensitivity of the laser gyro. The minimum magnetic sensitivity is not identical with peak gain for the laser gyro. Large phase and amplitude anisotropies of mirrors are useful to reduce magnetic sensitivity and ellipticity. These findings are significant for the reduction of magnetic sensitivity in ring laser gyros.