Optimization of DLDOEs with High Diffraction Efficiency Under Oblique Incidence
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.
double-layer diffraction optical elementdiffraction efficiencyincident anglehybrid optical refraction-diffraction system
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维普
