光学学报, 2017, 37 (5): 0523003, 网络出版: 2017-05-05
全息波导显示系统的实现与优化 下载: 982次
Realization and Optimization of Holographic Waveguide Display System
摘要
在全息波导近眼显示系统中, 微像源发出的载像光波经过准直后,被输入耦合光栅耦合入平板波导, 进一步在平板波导上下表面内进行全反射传播, 到达输出端后通过输出耦合光栅衍射出波导, 最终到达人眼。以真实的图像传输为目标, 对全息波导光栅的效率、视场角等方面进行理论分析和优化设计, 通过激光干涉曝光实验制作了光栅周期为197 nm、光栅矢量与介质表面法线方向夹角为26°、厚度为7.5 μm的全息光栅, 光栅峰值效率大于80%。结合波导光学设计, 进一步实现了图像的传输。
Abstract
In the near-eye display system of holographic optical waveguide, the carrier wave emitted from the micro-image source is collimated and then coupled into the slab waveguide by input coupling grating. The wave propagates through the upper and lower surfaces of the slab waveguide with total reflection. After reaching the output end, passing through output coupling grating, the wave propagates out of the waveguide and finally reaches the human eye. In order to achieve real image transmission, aspects such as the holographic diffraction efficiency and the field of view are theoretically analyzed and optimally designed. A holographic grating with grating period of 197 nm, grating vector angle of 26°, and thickness of 7.5 μm is fabricated in the laser interference exposure experiment. The peak efficiency of the grating is more than 80%. Combined with waveguide optical design, we realize the image transmission.
刘奡, 张宇宁, 沈忠文, 王保平. 全息波导显示系统的实现与优化[J]. 光学学报, 2017, 37(5): 0523003. Liu Ao, Zhang Yuning, Shen Zhongwen, Wang Baoping. Realization and Optimization of Holographic Waveguide Display System[J]. Acta Optica Sinica, 2017, 37(5): 0523003.