等周期变倾角干涉条纹复用法扩展增强现实耦合元件体光栅角度带宽

彭灿福; 李文昊; 张伟; 陈星硕; 刘睿; 张婧英; 李文龙

doi:10.37188/CO.2023-0050

等周期变倾角干涉条纹复用法扩展增强现实耦合元件体光栅角度带宽

doi: 10.37188/CO.2023-0050

彭灿福^{1, 2,},
李文昊¹,
张伟^1, ,,
陈星硕^{1, 2},
刘睿^{1, 2},
张婧英^{1, 2},
李文龙^{1, 2}

1.
中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
2.
中国科学院大学, 北京 100049

基金项目: 国家重点研发计划资助项目（No. 2022YFF1202002）；国家自然科学基金项目（No. 62005270）；中国科学院战略性先导科技专项（C类）资助（No. XDC04030100）；吉林省科技发展计划项目（No. 20210201140GX，No. 20210402056GH）；吉林省与中国科学院科技合作高技术产业化专项资金项目（No. 2022SYHZ0024）

详细信息

作者简介:
彭灿福（1998—），男，福建泉州人，硕士研究生，2020年于闽南师范大学获得学士学位，主要从事光栅设计、AR光波导光学设计等方面的研究。E-mail：pengcanfu@163.com

张　伟（1990—），男，山西大同人，博士，副研究员，2011年于电子科技大学获学士学位，2016年于中国科学院大学获博士学位，主要从事光栅理论设计及制作工艺、微纳光学等方面的研究。E-mail：zhangwei1990@ciomp.ac.cn

中图分类号: O436
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出版历程
- 收稿日期: 2023-03-27
- 修回日期: 2023-04-21
- 录用日期: 2023-05-22
- 网络出版日期: 2023-06-01

Expanding the angular bandwidth of augmented reality coupling element volume holographic grating by multiplexing equal-period and variable-inclination-angle interference fringes

PENG Can-fu^{1, 2
,},
LI Wen-hao¹,
ZHANG Wei^{1
, ,},
CHEN Xing-shuo^{1, 2},
LIU Rui^{1, 2},
ZHANG Jing-ying^{1, 2},
LI Wen-long^{1, 2}

1.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: Supported by National Key R & D Program of China (No. 2022YFF1202002); National Natural Science Foundation of China (NSFC) (No. 62005270); Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDC04030100); Jinlin Province Science and Technology Development Plan (No. 20210201140GX, No. 20210402056GH); Special Fund Project of High-tech Industrialization of Science and Technology Cooperation between Jilin Province and Chinese Academy of Sciences (No. 2022SYHZ0024)

More Information

Corresponding author: zhangwei1990@ciomp.ac.cn

摘要

摘要:
为了提高光波导近眼显示成像系统的视场角，本文提出了一种等周期变倾角干涉条纹复用方法，用于扩展增强现实眼镜耦合元件体光栅的角度带宽。该方法通过复用等周期变倾角干涉条纹满足了不同入射角的布拉格条件，并且消除了体光栅周期变化对入射光衍射角度的影响，从而提升耦合元件体光栅的角度响应范围，降低光栅衍射引入的杂散光。利用严格耦合波理论对复用三幅等周期变倾角干涉条纹的体光栅进行模拟，在波长为530 nm的TE和TM偏振态下，复用后的体光栅角度带宽分别为3.6°和3.3°，与单幅干涉条纹体光栅相比，角度带宽扩展了1倍。该方法有望打破体光栅角度带宽受光栅材料的限制，用于扩展近眼显示成像系统的视场角，实现轻量化、高效率、大视场、低杂散光的增强现实眼镜。
- 增强现实 /
- 近眼显示 /
- 体光栅复用 /
- 角度带宽扩展
Abstract:
To improve the field of view of the near-to-eye display imaging system by using the optical waveguide scheme, we propose a method of multiplexing interference fringes with equal periods and variable inclination angles to expand the angular bandwidth of the volume holographic grating for augmented reality glasses coupling element. With this method, the range of incident angles after the expansion mathes the Bragg condition, and the influence of the periodic change on the diffraction angle of the incident light is eliminated, thereby improving the angular response range of the coupling element volume holographic grating and reducing the stray light introduced by grating diffraction. The rigorous coupled wave analysis theory is used to simulate the volume holographic grating multiplexing three interference fringes with equal period and variable inclination angles. Under the TE and TM polarization states at the wavelength of 530 nm, the angular bandwidth of the multiplexed volume holographic grating is 3.6° and 3.3°, respectively. The angular bandwidth of the multiplexed volume holographic grating is twice as large as that of the volume holographic grating recorded with a single interference fringe. This method is expected to break the limitation of the volume holographic grating material on the angular bandwidth of the grating, and can be used to expand the field of view of the near-to-eye display imaging system to achieve lightweight, high-efficiency, large-field-of-view, and low-stray-light augmented reality glasses.
- augmented reality /
- near-to-eye display /
- volume holographic grating multiplexing /
- angular bandwidth expansion

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图 1 体全息光栅波导工作原理

Figure 1. Working principle of volume holographic grating waveguide

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图 2 体光栅角度响应特性分析

Figure 2. Analysis of angular response characteristics of volume holographic grating

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图 3 复用体光栅衍射特性分析

Figure 3. Multiplexing volume holographic grating diffraction characteristics

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图 4 体光栅与复用体光栅角度带宽随入射角度的变化曲线

Figure 4. Angular bandwidth of volume grating and multiplexed volume grating varying with incident angle

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图 5 不同入射条件下干涉条纹倾角间距对体全息光栅衍射特性影响

Figure 5. The influence of interference fringe inclination angle interval on the diffraction characteristics of volume holographic grating under different incident conditions

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图 6 折射率调制度对体光栅衍射特性的影响

Figure 6. Effect of refractive index modulation on diffraction characteristics of volume holographic grating

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图 7 体光栅光波导的视场角分析示意图

Figure 7. Schematic diagram of FOV analysis for the volume holographic grating waveguide

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