理论上推导出了环形激光器对S光和P光相位延迟差与其拍频峰对应的压电陶瓷电压差的关系式, 分析了方形环形激光器对S光和P 光的频率响应特性, 通过测量拍频峰电压差实现环形激光器反射镜相位延迟差测量。通过搭建环形激光器频率响应特性测试系统, 从实验上验证了理论计算的正确性。结果表明, 该方法测量误差小于1.5%, 满足环形激光器反射镜相位延迟差测量要求。

The theoretical formula between the reflection phase retardation difference of S polarized beam and P polarized in square ring resonator and the beat frequency driving voltage difference in the piezoelectric ceramic (PZT) was derived. The frequency response characteristic of S polarized beam and P polarized beam in the square ring resonator was analyzed, and a new method for measuring the phase retardation difference by measuring the voltage difference was proposed. The passive ring resonator frequency response measuring system was set up, and the validity of the theoretical analysis was verified by experiment. The results indicate that the measuring error is less than 1.5%, which satisfies the requirement for the reflection phase retardation measurement.