单元件干涉数字全息的光线追迹模型  

Ray tracing model of digital holography with single element interference

作　　者：解翔宇 王鹏[1] 邓颖[2] 周凯南[2] 冯国英[1] Xie Xiangyu;Wang Peng;Deng Ying;Zhou Kainan;Feng Guoying(Institute of Laser and Micro/Nano Engineering,College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China;Laser Fusion Research Center,CAEP,Mianyang 621900,China)

机构地区：[1]四川大学电子信息学院激光微纳工程研究所,成都610065 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2023年第5期159-166,共8页High Power Laser and Particle Beams

基　　金：国家重点研发计划项目(2022YFB3606304);国家自然科学基金项目(U2230129)。

摘　　要：基于棱镜对的单元件干涉可以获得透射物体的相位信息,即数字全息,具有结构紧凑、干涉条纹稳定、测量精度高等优点。采用光线追迹方法,综合考虑了棱镜对的方位角旋转、斜面偏心等参数,建立了光线追迹等效模型,仿真了数字全息干涉条纹,给出了条纹密度变化及倾斜的解析表达式。针对单模和多模光纤等微结构光学元件,获得了干涉数字全息图,并反演出其折射率分布。搭建了显微成像单元件干涉实验装置,获得了实际测量干涉图样,实验与仿真结果一致,证明了本模型的有效性。The phase information of the transmitted object,also known as digital holography,can be obtainedby the element interference based on prism pair.This method has the advantages of compact structure,stableinterference fringe and high measurement accuracy.In this paper,the ray tracing method is used to establish theequivalent model of ray tracing,considering the azimuth rotation of the prism pair and the eccentricity of the inclinedplane.The equivalent model is used to simulate the digital holographic interference fringes,and give the analyticexpressions of fringe density change and tilt.The interference digital holograms are obtained and the refractive indexdistribution is inversed for the micro structure optical elements such as single-mode and multimode fibers.Theexperimental device of micro imaging unit interference is built,and the actual measurement interference pattern isobtained.The experimental results are consistent with the simulation results,which proves the effectiveness of thismodel.

关 键 词：光线追迹 单元件干涉 数字全息 单模和多模光纤折射率分布 

分 类 号：TB87.1[一般工业技术—摄影技术]