偏振棱镜消光比参量精密测量方法  

The Research on Measuring the Extinction Ratio of Polarizing Prism Accurately

作　　者：郝冲[1,2] 吴易明[1] 陆卫国[1] 肖茂森[1] 李春艳[1,2] 

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119 [2]中国科学院大学,北京100049

出　　处：《光子学报》2014年第12期159-163,共5页Acta Photonica Sinica

基　　金：陕西省科技计划基金项目(No.2011kjxx27)资助

摘　　要：为解决偏振棱镜消光比参量传统检测方法中,由于光线的非垂直入射和消光位置定位误差等因素的影响,导致不能精确测量的问题,以格兰-泰勒棱镜为例,通过对偏振光进行磁光调制以精确确定待测棱镜消光位置,并在消光位置附近多次小角度转动待测棱镜,以减小光线的非垂直入射对出射光强产生的非线性微扰.仿真和实验验证表明,该方法可以准确地得到消光光强与平行光强,得出消光比参量,满足测量准确度要求.In traditional method of testing the extinction rate of polarizing prism, as the incidence is not vertical and the position of extinction cant t be located accurately, extinction ratio can be measured accurately neither. To solve this problem, taking Glan-Taylor prism for example, magneto-optic modulation was adopted to define the extinction place accurately, rotating the prism several times to decrease the nonlinear perturbation caused by oblique incidence. Simulation and experiment show that, the minimum and maximum light intensity can be gained, the extinction rate was also obtained and fulfilled the precision requirement.

关 键 词：偏振光 偏振棱镜 磁光调制 消光比 间接调制 

分 类 号：TH741.2[机械工程—光学工程] O436.3[机械工程—仪器科学与技术]