三步无混叠采样菲涅耳衍射实现大视场全息显示  

Large Field-of-View Holographic Display Realized by Three-Step Non-Aliasing Sampling Fresnel Diffraction

作　　者：张可 孙秀辉[2] 蔡子涵 吕咏墨 陈建军 尹韶云 Zhang Ke;Sun Xiuhui;Cai Zihan;LüYongmo;Chen Jianjun;Yin Shaoyun(School of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Institute of Intelligent Manufacturing Technology,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China)

机构地区：[1]重庆邮电大学光电工程学院,重庆400065 [2]中国科学院重庆绿色智能技术研究院智能制造技术研究所,重庆400714

出　　处：《光学学报》2024年第16期68-75,共8页Acta Optica Sinica

基　　金：国家自然科学基金(62175239);重庆市自然科学基金(cstc2021jcyj-nsxmX0781)。

摘　　要：提出一种大视场全息显示方法,在空间光调制器前方引入一个短焦凸透镜,并根据光经过凸透镜时先聚焦再发散的性质执行三步菲涅耳衍射,通过调控凸透镜所在平面、凸透镜焦平面、观察平面3个平面的位置,扩大观察平面的显示范围。同时针对此结构,提出相匹配的三步无混叠采样菲涅耳衍射算法,避免了传统菲涅耳衍射算法中由欠采样造成的混叠误差,最终实现高质量的大视场全息显示。通过仿真和光学实验验证了所提方法的可行性和有效性,其可用于大视场全息投影、大衍射图案的光束整形等领域。Objective Holographic display technology can fully capture and reproduce the wavefront information of 3D light fields,making it the most promising 3D display technology.With the advancement of spatial light modulators(SLMs),they have become integral to holographic display systems,typically used to load phase-only holograms for modulating incident light.Holographic display technology based on SLMs digitizes recorded objects to generate holograms,simulating the propagation of object light.This allows reproduction not only of real objects but also virtual ones,unconstrained by the physical form of the object.However,current SLM structures limit the size of holographic reconstruction images,often failing to meet the demands of large field-of-view holographic displays.This paper proposes a method for achieving large field-of-view holographic displays.It involves placing a short focal length convex lens in front of the SLM.By utilizing the lens’s property of focusing and then diverging light,a three-step Fresnel diffraction process is implemented.Adjusting the position of the convex lens plane,its focal plane,and the observation plane expands the display range of the observation plane.Furthermore,to mitigate aliasing errors caused by undersampling in traditional Fresnel diffraction algorithms,a novel three-step non-aliasing sampling Fresnel diffraction algorithm is introduced.This approach ultimately enables large field-of-view holographic displays with high quality.Methods The holographic display system comprises an SLM and a short focal length convex lens.Leveraging the convex lens’s property of focusing light before diffusing it,and considering the size relationship between objects and images in the Fresnel diffraction algorithm based on a single fast Fourier transform(FFT),we adjust the positions of the convex lens plane,its focal plane,and the observation plane to enlarge the reconstructed image.Next,we propose a three-step non-aliasing sampling Fresnel diffraction algorithm tailored to this setup.Different op

关 键 词：全息 大尺寸 菲涅耳衍射 采样定理 纯相位全息图 

分 类 号：O436.1[机械工程—光学工程]