基于坐标变换的曲面全息波导追迹方法  

Curved Holographic Waveguides Ray-Tracing Method via Coordinate Transformation

作　　者：张海军 赵宝奇[4] 彭飞 Zhang Haijun;Zhao Baoqi;Peng Fei(School of Precision Instrument and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China;Science and Technology on Electro-Optic Control Laboratory,Luoyang,Henan 471000,China;Luoyang Institute of Electro-Optical Equipment,AVIC,Luoyang,Henan 471000,China;Military Representative Office of PLA in No.613 Institute,Luoyang,Henan 471000,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]光电控制技术重点实验室,河南洛阳471000 [3]洛阳电光设备研究所,河南洛阳471000 [4]中国人民解放军驻六一三所军事代表,河南洛阳471000

出　　处：《激光与光电子学进展》2022年第7期284-289,共6页Laser & Optoelectronics Progress

摘　　要：近眼显示技术中采用的全息波导元件通常为平面面型,不能很好地贴合使用者头部曲线。曲面面型的全息波导虽然能够更好地贴合头部曲线,但由于光线在曲面波导中传输过程复杂,使得设计非常困难。为建立曲面全息波导成像设计方法,分析了光在曲面全息波导中的关键传输过程,提出了适合曲面全息波导的光线追迹数学模型,建立了光线在曲面波导中传输过程的追迹算法,实现了曲面全息波导的设计。基于该算法,分别开展了球面面型和柱面面型的曲面全息波导光学系统设计,并进行了光线追迹仿真评估。根据设计结果,制备了柱面面型的曲面全息波导元件,并在光学系统中进行了成像演示。观测结果验证了该方法设计曲面全息波导的可行性。The holographic waveguide used in near-eye display technology is usually planar,making it difficult to fit the user’s head.Although the holographic waveguide with a curved surface can better fit the curve of the user’s head,its design is very difficult owing to the complex light transmission process in the waveguide.To establish the imaging design method of a curved holographic waveguide,the key transmission process of light in a curved holographic waveguide is analyzed,the ray-tracing mathematical model suitable for a curved holographic waveguide is proposed,and the ray-tracing algorithm for the light transmission process in a curved holographic waveguide is established.Then,the design of the curved holographic waveguide is realized.Based on the algorithm,the optical systems of spherical and cylindrical surface holographic waveguides are designed and the ray-tracing simulation is performed.According to the design results,the cylindrical curved holographic waveguide elements are fabricated and demonstrated in the optical system.The observation results verify the feasibility of the proposed method.

关 键 词：光学设计 光路追迹 全息波导 曲面波导 

分 类 号：O439[机械工程—光学工程]