A single-aperture spectroscopic super-diffraction imaging system and method thereof

Abstract

The invention provides a single-aperture light-splitting super-diffracting imaging system comprising a beam compressing mirror, a two-dimensional scanning device, an N-level beam splitting sub system, and a focusing lens. Incident light is compressed by the beam compressing mirror; the N-level beam splitting sub system splits a compressed light path into N*N sub beam arrays based on amplitude light splitting; and one group of parallel reflectors are arranged in each beam sub system to adjust optical lengths of all sub beams, so that wave fronts SK with equal phased are formed for the N*N sub beam arrays in front of the focusing lens. After processing by the focusing lens, self-interference processing of the N*N sub beam arrays is carried out to realize super diffracting. The technical scheme can be applied to a large-calibre small-relative-aperture optical imaging system; the super-diffracting imaging is realized by using a light-splitting multi-aperture self-interference super-diffracting imaging technology; and on the basis of N*N light splitting, N-times super-diffracting effect is formed.

Description

technical field [0001] The invention relates to a single-aperture spectroscopic super-diffraction imaging system. Background technique [0002] In the traditional ultra-long-distance high-resolution imaging system, due to the limitation of volume and weight, the aperture of the optical system is also limited accordingly. In this case, when the focal length of the optical system exceeds a certain value, it is affected by the diffraction of the ideal aperture. Imaging system resolution cannot be further improved. The impact is particularly obvious in space-based imaging systems. For geosynchronous orbit imaging systems, the imaging distance is about 36,000 km. If the imaging resolution of ground meters is achieved, the focal length of the optical system is about 100 meters, and the corresponding optical system aperture is also It needs to reach a diameter of tens of meters. Even if lightweight measures are taken, the weight of the optical system is about a hundred tons. Such ...

AI Technical Summary

Problems solved by technology

[0002] In the traditional ultra-long-distance high-resolution imaging system, due to the limitation of volume and weight, the aperture of the optical system is also limited accordingly. In this case, when the focal length of the optical system exceeds a certain value, it is affected by the diffraction of the ideal aperture. Imaging system resolution cannot be further improved

The impact is particularly obvious in space-based imaging systems. For geosynchronous orbit imaging systems, the imaging distance is about 36,000 km. If the imaging resolution of ground meters is achieved, the focal length of the optical system is about 100 meters, and the corresponding optical system aperture is also It needs to reach a diameter of tens of meters. Even if lightweight measures are taken, the weight of the optical system is about a hundred tons. Such a weight obviously cannot use the existing launch vehicles to complete the task; how can the imaging system with a small aperture and a long focal length It has become an important research content at home and abroad to break through the limitation of the diffraction limit and effectively increase the resolution of the imaging system.

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