Design and Diffraction Efficiency of a Multi-Layer Diffractive Optical Element
基于眼模型的折/衍混合眼底相机设计

Using diffractive optics theory,a portable Hybrid Refractive/Diffractive digital retina camera without mydriatic was designed based on Gullstrand-Le Grand eye model.The camera consists of 5 lenses,including one binary surface,and realizes the highly clear image with 2 mega pixels in all the 28 fields of view after the comprehensive consideration of both the human eye and the camera.This camera has strong abilities for accommodation,which could adapt the different eyes from -10D to 7D.The result shows that the resolution of this system is 120 lp/mm,the field curve value is less than 0.75 mm,the distortion value is 7.0% and the chromatic value is less than 3.5 μm.And,after the application of the binary diffractive element,the structure is simplified effectively and the volume and weight has decreased.