利用反馈光路的弹光调制器定标及稳定控制  

Calibration and stability control for photoelastic modulator using feedback optical path

作　　者：李克武 王爽[2] LI Kewu;WANG Shuang(School of Electrical and Control Engineering,North University of China,Taiyuan 030051,China;Engineering and Technology Research Center of Shanxi Province for Opto-electronic Information and Instrument,Taiyuan 030051,China;Academy for Advanced Interdisciplinary Research,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学电气与控制工程学院,山西太原030051 [2]山西省光电信息与仪器工程技术研究中心,山西太原030051 [3]中北大学前沿交叉科学研究院,山西太原030051

出　　处：《应用光学》2022年第5期935-942,共8页Journal of Applied Optics

基　　金：国家国际科技合作专项项目(2013DFR10150);山西省应用基础研究计划项目(201901D211234)。

摘　　要：为了实现弹光调制器(photoelastic modulator,PEM)精确定标和长时间稳定工作,提出了一种利用反馈光路的相位延迟幅值定标及控制方案,理论计算并仿真分析了PEM通光孔径上相位延迟幅值的空间分布。在偏离PEM中心的位置设计了集成化的定标反馈光路;结合倍频项比值的相位延迟幅值定标方法,采用数字锁相技术同时提取反馈光路调制光强信号中倍频项,求解出PEM相位延迟幅值。按照上述方案加工制作了PEM实物,并进行了定标及稳定控制实验。实验结果表明,PEM中心相位延迟幅值的定标值与实测值相对偏差不超过0.22%;利用反馈光路控制约100 min,PEM相位延迟幅值标准偏差为0.001 8 rad,最大偏差低于0.42%,实现了PEM相位延迟幅值精确、实时定标,同时实现了PEM长时间稳定控制。In order to achieve the accurate calibration and long-time stable operation for photoelastic modulator(PEM), a calibration and control scheme of phase retardation amplitude which using feedback optical path was established, and the spatial distribution of phase retardation amplitude on the PEM optical aperture was theoretically calculated and simulated. An integrated calibration feedback optical path was designed deviating from the center of PEM. Combined with the phase retardation amplitude calibration method using the ratio of harmonic terms, the digital phase lock technology was used to simultaneously extract the harmonic terms of the modulated light intensity signals from the feedback optical path, and then the phase retardation amplitude of PEM was solved. According to the proposed scheme, the PEM physical object was processed, and the calibration experiment and stability control experiment were both carried out. The experimental results show that, the relative deviation between the calibration value and measured value of phase retardation amplitude of PEM center does not exceed 0.22%. With the use of feedback optical path to control the PEM about 100minutes, the standard deviation of PEM phase retardation amplitude is 0.001 8 rad and the maximum deviation is lower than 0.42%, which realizes the accurate and real-time calibration of PEM phase retardation amplitude and the long-time stable control of PEM is also verified.

关 键 词：弹光调制器 相位延迟幅值 精确定标 稳定控制 

分 类 号：TN29[电子电信—物理电子学] O436.3[机械工程—光学工程]