再现域模型相位补偿法提高液晶空间光调制器全息再现像质量研究  

Study on Improving Quality of Liquid Crystal Spatial Light Modulator Holographic Reproduction Images by Phase Compensation Method of Reproduction Domain Model

作　　者：胡驰 张锦[1] 孙国斌[1] 蒋世磊[1] 刘严严 Hu Chi;Zhang Jin;Sun Guobin;Jiang Shilei;Liu Yanyan(School of Opto-electronical Engineering,Xi'an Technological University,Xi'an 710021,Shaanxi,China;National Key Laboratory of Electromagnetic Space Security,Tianjin 300308,China)

机构地区：[1]西安工业大学光电工程学院,陕西西安710021 [2]电磁空间安全全国重点实验室,天津300308

出　　处：《光学学报》2023年第19期127-137,共11页Acta Optica Sinica

基　　金：陕西省教育厅重点实验室科研计划(18JS053);陕西省科技厅重点实验室项目(2013SZS14-P01);装备预研重点实验室基金(2021JCJQLB055018)。

摘　　要：针对液晶空间光调制器(LC-SLM)全息再现结果受零级衍射光斑和本身黑栅效应影响,导致再现像光能利用率低和均匀性较差的问题,本文提出一种利用数字闪耀光栅对再现像进行偏离并结合全息再现域模型的相位补偿法,有效提高了再现像的均匀性。其主要原理为:在设计的相位全息图上加载一定周期的数字闪耀光栅后,根据再现区域的光强分布情况反推出补偿量,并将其和原物光波进行合成,重新计算相位全息图实现对再现结果的调整,在避免了零级衍射光斑影响的同时,提高了全息像的再现效果。通过对相位补偿量进行优化计算和仿真验证,并搭建全息再现光路,将补偿计算后的相位加载到空间光调制器(SLM)上进行再现实验验证和测试,实验结果表明,补偿后的再现像均匀性提高为原来的2倍,且光能利用率也有一定的提高。研究结果表明,本文所提出的再现域模型相位补偿法能有效提高SLM全息再现像的均匀性和光能利用率。因此该方法对基于SLM的全息再现或光场调控质量的提高具有一定的应用价值。Objective With the continuous development of spatial light modulators,it has been widely applied in many fields,such as light field control,beam shaping,beam deflection,and holographic reproduction,with unparalleled advantages.However,due to limitations of process conditions,it also has many defects.The existence of zero-order spots and multiorder diffraction images caused by its own"black-matrix effect"will exert certain effects on the quality of the output light field,which leads to a low utilization rate of light energy and poor uniformity of reproduced images.However,most studies nowadays are conducted from the perspective of algorithm design to improve the reproduced image quality of holographic display.But when the liquid crystal spatial light modulator(LC-SLM)is employed for holographic display,due to the influence of the"black-matrix effect",the light energy distribution of the reproduced results follows the sinc function distribution,so that the energy distribution of the reproduced images is not uniform.We propose a method to improve the uniformity of the reproduced images through digital blazed grating to deviate the reproduced images and combine with the phase compensation method of the holographic reproduction domain model.This method provides theoretical assistance to improve the quality of reproduction results when LC-SLMs are leveraged for holographic reproduction.Methods Based on the principle of Fresnel hologram calculation,our main design principle is analyzing the influence of zero-order spots and multi-order diffraction images produced by the"black-matrix effect"of the LC-SLM adopted for holographic reproduction on the results.Then with an aim at avoiding the offset of the zero-order spots on the reproduced images by digital blazed grating superimposed on the hologram,and finally to compensate for the uneven distribution of light energy,the phase is compensated according to the proposed reproduction domain model.The steps are as follows.First,the reproduction domain is determined according to

关 键 词：全息 液晶空间光调制器 全息再现 再现域 相位补偿 

分 类 号：O438.1[机械工程—光学工程] O436.1[理学—光学]