基于液晶空间光调制器的计算全息波前编码方法  

Wave-front encoding method of computer-generated holography based on liquid-crystal spatial light modulator

作　　者：隋晓萌 何泽浩 曹良才[1] 金国藩[1] SUI Xiao-meng;HE Ze-hao;CAO Liang-cai;JIN Guo-fan(State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instruments,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学精密测试技术及仪器国家重点实验室,精密仪器系,北京100084

出　　处：《液晶与显示》2022年第5期613-624,共12页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.62035003)。

摘　　要：波前编码过程将计算全息所得的复振幅波前变换为与显示器件匹配的调制函数,是计算全息显示的关键技术之一。现有的计算全息显示器件大多只能实现单一振幅或单一相位调制,因此需要将复振幅波前编码为相应的振幅型或相位型全息图。本文围绕基于液晶空间光调制器的计算全息显示,综述了相位优化编码与复振幅转化编码的基本原理与算法步骤,分析了常见的波前编码方案框架,针对不同编码方法的适用范围进行讨论,为计算全息图波前编码提供方法选择参考。Wavefront encoding is a crucial step in computer-generated holography,which converts the complex-amplitude wavefront on the hologram plane into a holographic modulating function.Since the digi⁃tal element for complex-amplitude modulation is not yet available,current implementations of holographic wavefront modulation are carried out by phase-type or amplitude-type elements.The holograms are rela⁃tively converted to amplitude-only or phase-only forms.Herein,the phase optimization encoding and com⁃plex-amplitude converting methods of computer-generated holography based on liquid crystal spatial light modulators are introduced.The basic principle,range of applications,and algorithm flows are discussed,providing feasible strategies for various holographic implementations.

关 键 词：波前编码 三维显示 计算全息 液晶空间光调制器 

分 类 号：O753.2[理学—晶体学]