斜入射高衍射效率双层衍射光学元件优化方法  

Optimization of DLDOEs with High Diffraction Efficiency Under Oblique Incidence

作　　者：刘子龙 付跃刚[1] 胡源[1] 周新雨 关禹聪 LIU Zilong;FU Yuegang;HU Yuan;ZHOU Xinyu;GUAN Yucong(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130000,China)

机构地区：[1]长春理工大学光电工程学院,长春130000

出　　处：《电光与控制》2025年第1期80-85,共6页Electronics Optics & Control

基　　金：吉林省教育厅科技基金(JJKH20210814KJ)。

摘　　要：针对双层衍射光学元件传统优化方法斜入射时衍射效率偏低的问题,基于双层衍射光学元件衍射效率与入射角度及波长的理论关系模型,提出了角度优化设计方法。通过分析设计过程中不同入射角和微结构高度对衍射效率的影响,优化选取微结构高度,显著提高了大视场下的衍射效率。为了验证上述理论,采用长短波衍射效率相等法、带宽积分平均衍射效率最大法以及提出的角度优化设计方法,分别对可见光波段和红外波段的双层衍射光学元件进行设计。结果表明,角度优化设计方法能够有效提高双层衍射光学元件的角度带宽积分平均衍射效率,进而提高光学系统的成像质量。最后,基于角度优化设计方法设计了长焦折衍混合系统,实现了高衍射效率下的高像质折衍混合系统。The diffraction efficiency under oblique incidence is low in traditional optimization methods for Double-Layer Diffraction Optical Elements(DLDOEs).Based on the model of theoretical relationships of diffraction efficiency with incident angles and wavelengths for DLDOE,an angle-optimized design method is proposed.By analyzing the influence of different incident angles and micro-structure heights on diffraction efficiency in the designing process,optimal micro-structure heights are selected,which significantly enhance the diffraction efficiency at large field-of-view.In order to validate the above theory,the proposed angle-optimized designing method is applied alongside the method of equal diffraction efficiency under long and short wavelengths,and the bandwidth-integrated average diffraction efficiency maximization method,and the DLDOE in both the visible light and infrared spectrum are designed.The results demonstrate that the angle-optimized design method can effectively increase the angular bandwidth-integrated average diffraction efficiency of DLDOE,thereby enhancing the imaging quality of optical systems.Finally,based on the angle-optimized designing method,a long-focus hybrid refraction-diffraction system is designed,which achieves high image quality with high diffraction efficiency.

关 键 词：双层衍射光学元件 衍射效率 入射角度 折衍混合光学系统 

分 类 号：O435[机械工程—光学工程]