基于双重体光栅的波导显示系统视场扩展研究  

Field-of-View Expansion of Waveguide Display System with Double-Layer Volume Grating

作　　者：王闯 沈忠文 翁一士 张宇宁[1] 王保平[1] Wang Chuang;Shen Zhongwen;Weng Yishi;Zhang Yuning;Wang Baoping(International Joint Research Laboratory for Information Display and Visualization,School of Electronic Science and Engineering,Southeast University,Nanjing,Jiangsu 210096,China)

机构地区：[1]东南大学电子科学与工程学院信息显示与可视化国际合作联合实验室,江苏南京210096

出　　处：《光学学报》2022年第7期257-264,共8页Acta Optica Sinica

基　　金：中央高校基本科研业务费专项资金(2242021K1G005);国家自然科学基金(62105060)。

摘　　要：体全息波导显示系统的视场角受限于光栅衍射响应带宽,无法满足人们对大视场显示的需求。为扩展波导显示视场角,基于严格耦合波理论模型分析了波导显示视场角的影响因素,进一步提出了一种可有效扩展衍射响应带宽的双重体光栅波导结构,通过变角度分次曝光法完成光栅制备,并搭建全息波导显示系统。成像结果表明,该显示系统的水平和竖直视场角可分别扩展至33.4°和22.6°,对角线视场角为40.3°。The fields-of-view of volume holographic waveguide display systems are often limited by the grating diffraction response bandwidth,which still cannot meet people’s needs for large field-of-view display.In order to expand the field-of-view of the waveguide display,the influencing factors of the field-of-view of the waveguide display are analyzed based on the strictly coupled wave theory model,and a double-layer volume grating waveguide structure that can effectively expand the diffraction response bandwidth is proposed.The grating is prepared by the variable-angle fractional exposure method,and the holographic waveguide display system is built.The imaging results show that the horizontal and vertical fields-of-view of the display system can be expanded to 33.4° and 22.6° respectively,and the diagonal viewing angle is 40.3°.

关 键 词：光学器件 全息波导 视场角 双重体光栅 

分 类 号：O438.1[机械工程—光学工程]