Design of a Wide-Band Annular Aperture Optical-Digital Joint Imaging System
One-piece annular aperture lenses are being increasingly adopted to meet the requirements of lightweight and miniaturization for space cameras.However,the system presents certain limitations due to its use of a single substrate and compact structure,which result in chromatic aberration and spherical aberration,and the reduction of diffractive efficiency of single-layer diffractive optical element in wide band.To mitigate these issues,diffraction optical elements as well as even-order non-spherical aberration corrections have been introduced.In this paper,we propose an end-to-end optical-digital joint imaging system that optimizes the point spread function,which is the main factor affecting diffraction efficiency.We construct a spatially invariant point spread function model to establish the restoration function for subsequent image restoration,achieving the restoration of degraded images.The proposed optical system operates within the wavelength range of 0.45‒1 µm and has the focal length of 185 mm,field of view of 5°,F#of 4,shading ratio of 0.35,and total length of 67.8 mm.
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