部分相干光照明完全偏振光栅成像系统研究  

Fully Polarized Grating Imaging System with Partially Coherent Light Illumination

作　　者：胡小英[1] 景心怡 李昊 刘爽 刘卫国[1] Hu Xiaoying;Jing Xinyi;Li Hao;Liu Shuang;Liu Weiguo(School of Optoelectronic Engineering,Xi’an Technological University,Xi’an 710021,Shaanxi,China)

机构地区：[1]西安工业大学光电工程学院,陕西西安710021

出　　处：《光学学报》2024年第16期124-132,共9页Acta Optica Sinica

基　　金：科技部项目基金(G2023041018L)。

摘　　要：基于偏振相干统一理论,研究光场相干性对正弦振幅光栅偏振成像系统的影响。建立空间域和频谱域数学模型,利用MATLAB软件对其进行模拟仿真。仿真结果显示,光栅归一化固有频率为0.8时,随着光源相干性更接近于完全相干光,成像系统频谱域一次谐波分量消失,仅剩直流分量。设计并搭建实验平台,利用50 line/mm的正弦振幅光栅进行实验研究,实验结果表明,当光栅归一化固有频率一定时,随着光源相干性增强,成像系统频谱域一次谐波分量消失,只有直流分量,实验结果与理论结果相吻合。Objective Traditional imaging captures only light intensity and position information visible to the human eye,leaving out other details.Polarization imaging extends this by revealing spatial polarization characteristics alongside traditional data,enriching information acquisition with higher resolution,wider field of view,and reduced environmental sensitivity in optical imaging.Grating,a crucial optical element known for diffraction and the Talbot effect,holds promising applications across various fields.In the spectral domain,analyzing grating systems provides intuitive insights:distinct frequency components convey unique information,with higher frequencies offering finer object details.By changing parameters like grating frequency,imaging environment,and light source,changes in spectral components enrich the original data,enhancing high-frequency detail,and image resolution.Against this backdrop,we design a polarization system for a grating illuminated by partially coherent light.Given the static nature of the target object,a time-division polarization imaging system is employed to explore object‒image relationships,analyze them in the spectral domain,and monitor changes in spectral components crucial for enhancing imaging resolution and target detection.Methods We investigate a polarization system for a grating illuminated by partially coherent light based on unified polarization theory.A physical model is built for the relationship between partially coherent light-illuminated gratings and polarization systems.The model is simulated to derive theoretical outcomes followed by the design and construction of an experimental platform.Experimental data is gathered,processed,and compared with theoretical results to validate conclusions.A simplified optical path diagram and mathematical model for the partially coherent light-illuminated grating polarization system are devised.By employing unified polarization and coherence theories,we introduce generalized Stokes parameters,extending the mutual intensity relationsh

关 键 词：成像系统 光栅 相干性 偏振特性 频谱分量 

分 类 号：O436[机械工程—光学工程]