激光陀螺腔长控制镜改进设计

Optimization design for ring laser gyro path length control mirror

腔长控制镜影响激光陀螺谐振腔的光束形状、光强等参数,是制约激光陀螺精度提高的重要因素之一。减少激光陀螺腔长控制镜的位移扭偏,提高腔长控制镜的环境耐受性,能够直接改善激光陀螺的性能。通过研究激光陀螺腔长控制镜的基本机理,分析了腔长控制镜单筋方案和双筋方案的典型结构和特点,给出了提高反射镜抗扭偏能力的设计方法,设计并实现了新型双筋腔长控制镜结构。改进的腔长控制镜仅由3种零件、2种材料构成。经过仿真分析和试验验证,设计的腔长控制镜可以有效抵抗反射面的歪斜扭偏,在-50℃～+70℃工作范围内,抗扭偏能力提高5～10倍,同时实现了低成本和高稳定性。

The path length control mirror（PLCM） may influence the beam shape and light intensity of ring laser resonator,which could seriously restraints the performance of ring laser gyro.This paper investigates the PLCM to improve the performance of ring laser gyro.Based on the PLCM working mechanism,the typical single and double flake mirrors were analyzed respectively.The method for improving the resistance to PLCM distortion angle was discussed.The new type of double PLCMs was designed and realized which were formed by 3 kinds of parts and two materials.The simulation and test results show that the new PLCM’s performance of resistance to shear declination is improved by 5～10 times,and it also realize the performance of low cost and high stability.