基于空间光调制器的正交相位光栅衍射特性  

Diffraction Characteristics of Orthogonal Phase Grating Based on Spatial Light Modulator

作　　者：翟中生[1] 黄缘胜 李沁洋 余鑫 吕清花[2] 谢博娅 曾臻[1] Zhai Zhongsheng;Huang Yuansheng;Li Qinyang;Yu Xin;LüQinghua;Xie Boya;Zeng Zhen(Key Lab of Modern Manufacture Quantity Engineering,School of Mechanical Engineering,Hubei University of Technology,Wuhan 430068,Hubei,China;School of Science,Hubei University of Technology,Wuhan 430068,Hubei,China)

机构地区：[1]湖北工业大学机械工程学院现代制造质量工程湖北省重点实验室,湖北武汉430068 [2]湖北工业大学理学院,湖北武汉430068

出　　处：《光学学报》2022年第16期6-14,共9页Acta Optica Sinica

基　　金：国家自然科学基金(32071457);武汉市科技成果转化专项(2020030603012342)。

摘　　要：利用空间光调制器可编程的特性,模拟周期、相位调制深度可调的数字正交相位光栅。在分析正交相位光栅结构的基础上,推导了其透过函数、远场衍射光场和衍射效率的计算方法,讨论了光栅周期T与相位调制深度ϕ对正交相位光栅衍射特性的影响。仿真和实验结果表明:在0~π的相位变化范围内,零级光相对光强随着相位深度的增大而逐渐降低,8个1级光光强逐渐增强;当ϕ=π时,零级光相对光强达到最小值0.25,此时一级光衍射效率最高为56.96%;在π~2π的相位变化范围内,零级光相对光强随着相位深度的增大而逐渐增强,而8个1级光光强逐渐减弱。该研究为正交相位光栅的应用提供了理论依据。In this paper,a digital orthogonal phase grating with adjustable period and phase modulation depth is simulated by using a programmable spatial light modulator.On the basis of analyzing the structure of orthogonal phase grating,its transmission function,far-field diffraction patterns,and diffraction efficiency are derived and calculated,and the influence of grating period T and phase modulation depthϕon the diffraction characteristics of orthogonal phase grating is discussed.The simulation and experimental results show that asϕincreases from 0 toπ,the relative intensity of zero-order light decreases gradually,and the intensity of eight first-order lights enhances.Whenϕequalsπ,the relative intensity of zeroorder light reaches the minimum value of 0.25,and the maximum diffraction efficiency of first-order light is 56.96%.Asϕincreases fromπto 2π,the relative intensity of zero-order light increases gradually,and the intensity of eight first-order lights decreases.This research provides a theoretical basis for the application of orthogonal phase grating.

关 键 词：光栅 正交相位光栅 空间光调制器 衍射光场 傅里叶频谱 

分 类 号：O436[机械工程—光学工程]