Optical design and analysis of illumination system based on augmented reality北大核心CSCD

照明系统是增强现实光学系统的重要组成部分，其体积、照度均匀性、能量利用率直接影响增强现实照明系统的质量，因此在照明系统中对光源二次配光非常重要。针对增强现实系统的自由曲面透镜形式和照明系统开展研究，重点分析准直系统集光角度与体积的对应关系，在对光源准直系统的面型构建详细分析基础上，对中心透射边缘反射的折反射式准直系统的面型进行求解，结合偏微分方程法和划分网格法，设计了自由曲面透镜，该系统与偏振分光棱镜共同组成硅基液晶（liquid crystal on silicon，LCoS）照明系统。仿真分析结果表明:系统照度均匀性达到91.96%，若不计偏振影响，照明系统光学效率达到66.6%。该系统具有结构简单紧凑、体积小、质量轻、照度均匀性高等特点，满足增强现实眼镜的需求。

Optical design and analysis of illumination system based on augmented reality

Illumination system is an important part of the augmented reality (AR) optical system, and its volume, illumination uniformity and energy utilization directly affect the quality of the AR system, so it is important for secondary light distribution of light source in illumination system. The free-form surface lens and illumination system of the AR system were studied, and the correspondence between light collecting angle and volume of collimating system was analyzed. Based on the detailed analysis of surface shape construction of collimating system, the surface shape of catadioptric collimating system reflected by the central transmission edge was solved. Combined with partial differential equation method and meshing method, a free-form lens was designed. The liquid crystal on silicon (LCoS) illumination system was composed of system and polarized beam splitter prism. After simulation analysis, the system illumination uniformity is 91.96%, and the optical efficiency is 66.6% without the effect of polarization. The system has simple and compact structure, small volume, light weight, and high illumination uniformity, which can meet the needs of AR glasses.