四频差动激光陀螺差分偏振损耗研究

Reducing Differential Polarization Loss in Four-Frequency Differential Laser Gyroscope

差分偏振损耗所导致的零偏直接影响四频差动激光陀螺性能。基于此,提出一种通过优化反射镜配置参数来有效减小差分偏振损耗的方法。基于琼斯矩阵,通过求解自洽方程,数值分析了四频差动激光陀螺反射镜参数及非共面折叠角对差分偏振损耗的影响,讨论确定了反射镜的较优参数配置。数值计算结果表明,反射镜反射相移对差分偏振损耗影响最为显著。当4个反射镜反射相移和为0且正负反射相移互相抵消时,差分偏振损耗为0,这对减小差分偏振损耗的工程化应用具有重要参考意义。

The bias caused by differential polarization loss directly affects the performance of four-frequency differential laser gyroscopes.This study proposes an optimization method for the configurable parameters of mirrors,and effectively reduces the differential polarization loss.Based on the Jones matrices,the self-consistent equation is numerically solved,obtaining the influences of the mirror parameters and the non-coplanar folding angle of the four-frequency differential laser gyroscope on the differential polarization loss.The mirror configurations are then improved.In the numerical calculations,the differential polarization loss is most affected by the reflectioninduced retardance of the mirror.When the sum of the reflection-induced retardances of four mirrors is 0 and the positive and negative reflection-induced retardances of four mirrors can wipe one another out,the differential polarization loss is 0.This technique will be valuable for reducing the differential polarization loss in engineering applications.