论文部分内容阅读
磁敏感度是二频机抖激光陀螺的重要误差之一,光束椭圆度是增大磁敏感度的重要因素。推导了环型腔的琼斯矩阵,分析了光路非共面、反射薄膜p光与s光反射系数比、反射相位差等参数对光束椭圆度的影响。计算表明,薄膜反射相位差对椭圆度的影响远大于其他因素,相对180°偏离3°以上时椭圆度大幅度减小并基本稳定。对常规反射膜系进行了优化设计与分析,获得了整体厚度减小1.3%的膜系结构,反射相位差为183°~187°,不但减小了光束的椭圆度,而且进一步稳定了腔内总损耗,降低了散射损耗,对提高激光陀螺磁场环境稳定性及精度性能具有很好的指导意义。
Magnetic susceptibility is one of the important errors of the two-frequency machine-shaking laser gyro. The ellipticity of the beam is an important factor for increasing the magnetic sensitivity. The Jones matrix of toroidal cavity is deduced. The influence of optical path non-coplanar, reflective film p-light and s-ray reflectance ratio and reflection phase difference on the ellipticity of the light beam is analyzed. The calculated results show that the influence of the film phase retardation on the ovality is far more than other factors. When the relative 180 ° deviates from 3 °, the ovality decreases and is basically stable. Optimized design and analysis of the conventional reflective film system, obtained a film structure reduced by 1.3% overall thickness, the reflection phase difference of 183 ° ~ 187 °, not only reduces the ovality of the beam, but also further stabilizes the cavity Total loss, reduce the scattering loss, to improve the laser gyro magnetic field environment stability and accuracy of performance has a good guiding significance.