ihe 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
Key words
double-layer diffraction optical element/diffraction efficiency/incident angle/hybrid optical refraction-diffraction system
维普
万方数据