Image magnified lensless holographic projection by convergent spherical beam illumination  

作　　者：Chenliang Chang Yijun Qi Jun Wu Jun Xia  Shouping Nie 常琛亮;祁怡君;吴俊;夏军;聂守平(1Jiangsu Key Laboratory for Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China; 2Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China)

机构地区：[1]Jiangsu Key Laboratory for Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China [2]Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China

出　　处：《Chinese Optics Letters》2018年第10期24-29,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(Nos.61605080 and 61775035);the National 863 Program of China(No.2015AA016301)

摘　　要：In liquid crystal spatial light modulator（SLM）-based holographic projection, the image is usually displayed at a distant projection screen through free space diffraction from a computer-generated hologram（CGH）. Therefore,it allows for removing of the projection lens for the sake of system simplification and being aberration free, known as the ＂lensless holographic projection＂. However, the maximum size of the optical projected image is limited by the diffraction angle of the SLM. In this Letter, we present a method for the implementation of image magnification in a lensless holographic projection system by using convergent spherical wave illumination to the SLM.The complete complex amplitude of the image wavefront is reconstructed in a lensless optical filtering system from a phase-only CGH that is encoded by the off-axis double-phase method. The dimensions of the magnified image can break the limitation by the maximum diffraction angle of the SLM at a given projection distance.Optical experiment results with successful image magnification in the lensless holographic projection system are presented.In liquid crystal spatial light modulator（SLM）-based holographic projection, the image is usually displayed at a distant projection screen through free space diffraction from a computer-generated hologram（CGH）. Therefore,it allows for removing of the projection lens for the sake of system simplification and being aberration free, known as the ＂lensless holographic projection＂. However, the maximum size of the optical projected image is limited by the diffraction angle of the SLM. In this Letter, we present a method for the implementation of image magnification in a lensless holographic projection system by using convergent spherical wave illumination to the SLM.The complete complex amplitude of the image wavefront is reconstructed in a lensless optical filtering system from a phase-only CGH that is encoded by the off-axis double-phase method. The dimensions of the magnified image can break the limitation by the maximum diffraction angle of the SLM at a given projection distance.Optical experiment results with successful image magnification in the lensless holographic projection system are presented.

关 键 词：CGH SLM 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]