新型双通道差分偏振干涉成像系统  

Novel dual channel polarization interference imaging system

作　　者：王田[1] 牛明生[1] 步苗苗 韩培高[1] 郝殿中[1] 杨敬顺 宋连科[1] Wang Tian, Niu Ming-Sheng, Bu Miao-Miao, Han Pei-Gao, Hao Dian-Zhong, Yang Jing-Shun ,Song Lian-Ke(Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Laser Institute of Qufu Normal University, Qufu 273165, Chin)

机构地区：[1]曲阜师范大学激光研究所山东省激光偏光与信息技术重点实验室,曲阜273165

出　　处：《物理学报》2018年第10期7-16,共10页Acta Physica Sinica

基　　金：山东省重点研发计划(批准号:2017GSF17125);曲阜师范大学引进人才科研启动项目(批准号:20130760)资助的课题~~

摘　　要：针对Wollaston棱镜和Savart偏光镜(SP)组合的差分成像光谱系统存在光线溢出和无法改变系统光程等问题,设计了一种新型双通道差分偏振干涉成像系统.此系统不仅可获取正交偏振图像,还可以通过调整Savart偏光镜的厚度来改变系统光程.介绍了该系统的结构、理论原理,并利用琼斯矩阵推导出四束偏振光线的复振幅及其相干光干涉强度表达式.分析了宽视场Savart偏光镜(WSP)和可调光程的Savart偏光镜(MSP)的分束特性,得出WSP相较于SP具有更好的剪切能力和WSP可优化系统光路的结论.获得了不同楔形结构角下MSP的光程差、横向剪切量随楔形移动量的变化曲线.通过实验验证,获取了不同剪切量下的干涉图像和复色光下平行、垂直分量的空间图像,进而获得了总的强度图像和差分强度图像.得出差分强度图像相较于偏振强度图像具有较高对比度的结论.研究结果对双通道成像光谱系统的性能优化具有一定的参考意义.The interference images with fixed spectral resolution can be obtained by using the existing static polarizationdifference imaging system because the optical path of the system cannot be changed flexibly. However, for different detection targets, the spectral resolution of the system determined by the optical path difference must be appropriate.To satisfy a variety of application requirements, a novel dual channel polarization-difference interference imaging system（DPDIIS）, based on the lateral shear of the wide-field-of-view Savart polariscope（WSP） and the modulated Savart polariscope（MSP）, is presented. The two-dimensional space images of a target and orthogonal interference images can be obtained by ad.justing the MSPunder different lateral displacements simultaneously. In addition, the remarkable characteristics of the system avoid spilling over rays and optimizing the system optical path effectively. In this paper,by using the Jones matrix, the system structure is demonstrated and the theoretical principle of DPDIIS is analyzed in detail. The amplitudes of the four beams from the MSP and the interference intensity expressions of the coherent light are derived. Then the splitting characteristics of the Savart polariscope（SP） and WSP are presented. It is concluded that the WSP has better shear ability than SP and the WSP can optimize the optical path effectively compared with Wollaston prism in the DPDIIS. The change ranges of the optical path difference and lateral displacement produced by the MSP for structure angles α = π/3, π/4, π/6 are analyzed in detail. The reconstructed orthogonal interferograms and the experimental interferograms under 632.8 nm monochromatic light for dMSP=1.00, 1.10, 1.20, 1.30 mm are obtained.A comparison between the experimental interference images and the simulated images proves that the interference fringes with different resolutions can be obtained simultaneously by adjusting the MSP. Meanwhile, the light intensities of the double optical paths are approximat

关 键 词：成像系统 偏光干涉 同时成像 宽视场Savart偏光镜 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]