超高速快轴旋转圆形弹光调制技术研究  

Research on Ultra-high-speed Fast-axis Rotating Circular Photoelastic Modulation Technology

作　　者：刘燕霖 张瑞 薛鹏 陈媛媛 王志斌 李孟委 LIU Yanlin;ZHANG Rui;XUE Peng;CHEN Yuanyuan;WANG Zhibin;LI Mengwei(School of Instrument and Electronics,Shanxi Provincial Photoelectric Information and Instrument Engineering Technical Research Center,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学仪器与电子学院,山西省光电信息与仪器工程技术研究中心,太原030051

出　　处：《光子学报》2024年第3期123-132,共10页Acta Photonica Sinica

基　　金：国家自然科学基金(No.62105302)。

摘　　要：针对目前广义椭偏测量速度受限问题,提出利用对称性更优的圆形弹光调制器代替机械旋转补偿器实现超高速测量。对弹光调制器内部受力进行理论研究,得到纯行波模式调制条件并利用COMSOL仿真验证。仿真结果表明,当弹光调制器处于纯行波调制模式时可视为一种快轴方向高速旋转的相位调制器。通过建立阻尼弦振动模型分析不同快轴方向下弹光晶体表面振动位移分布,提出一种弹光调制器在纯行波调制模式下的中心支撑方式用于实验。实验结果表明弹光调制器的快轴以f/2的角速率做圆周运动。同时验证了中心支撑方式可确保弹光调制器谐振后所受阻力均匀且最小,达到最佳支撑效果。研究结果可用于后续广义椭偏测量及各类高速偏振调制领域。In order to solve the problem of slow test speed of traditional generalized elliptical mechanical rotation,it is proposed to use a circular elastomeric modulator with better symmetry to replace the electrooptical phase modulator to achieve ultra-high-speed measurement.By decomposing the internal stress standing wave of the elasto-optic crystal into two columns of traveling waves with a phase difference ofπ/4,it is deduced that when the driving voltage amplitudes of the two piezoelectric actuators are equal and the phase difference isπ/2,the fast axis of the elastooptic modulator makes a circular motion with an angular frequency of f/2.However,during the actual experiment,the fast axis direction angle transformation of the photoelastic modulator cannot be seen.Therefore,in order to more vividly verify the pure traveling wave modulation mode,COMSOL software is used for simulation.Using the transient solver in COMSOL,simulations are performed based on the conditions derived from theory to obtain a periodic surface vibration displacement of the photoelastic modulator.The simulation results show that when the elastic optical modulator is in pure traveling wave modulation mode,it can be regarded as a phase modulator that rotates at high speed in the fast axis direction.Since the support structure of the common octagonal elastic optical modulator adopts the chamfer position with the smallest vibration displacement for support and fixation,it is different from the commonly used two-dimensional octagonal elastic optical modulator where the fast axis direction is fixed.In the pure traveling wave mode,the fast axis of the elastomer modulator rotates at high speed,so a new support method is required.By establishing a damped string vibration model and analyzing the three-dimensional vibration displacement of the surface of the elasto-optical crystal at different fast axis angles,a central support method based on the pure traveling wave modulation mode of the elasto-optical modulator is proposed.Then,using the theory of pola

关 键 词：超高速椭偏测量 纯行波调制模式 阻尼弦振动模型 圆形弹光调制器 

分 类 号：TN202[电子电信—物理电子学]