Broadband large-field-of-view imaging system based on free-form surface micro-nano structure lens

Abstract

The invention discloses a broadband large-field-of-view imaging system based on a free-form surface micro-nano structure lens. The broadband large-field-of-view imaging system comprises a flat free-form surface micro-nano structure lens, a spherical reflector and a visible light detector; an entrance pupil lens group of a reflection optical system adopts a flat free-form surface micro-nano structure lens to modulate a light beam bandwidth spectrum and an incident view field; and an incident light beam is transmitted to the spherical reflector through the flat free-form surface micro-nano structure lens, is reflected by the concave spherical surface of the spherical reflector, and is finally focused on the image surface of the visible light detector. The novel free-form surface micro-nano structure lens based on the micro-nano structure preparation technology is adopted as an entrance pupil optical element of the reflection system, and has the advantages of being large in view field, wide in band, high in resolution, light in weight and the like.

Description

technical field [0001] The invention provides a wide-band wide-field imaging system based on a free-form surface micro-nano structure lens, which belongs to the field of visible light imaging and micro-nano structure devices. Background technique [0002] High-resolution images have been a research direction in the field of imaging detection. At present, the resolution of imaging systems is mainly improved from two aspects: detectors and systems. In terms of high-resolution detectors, four methods are mainly used: detector stitching, single-lens scanning stitching, multi-lens staring stitching, and multi-scale staring stitching, but the four methods all sacrifice other imaging performance to improve resolution and have their own limitations. In terms of system, due to the existence of optical interference, the key to improving the resolution is to increase the system aperture, but the small F number and large aperture optical system are difficult to correct aberrations, smal...

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Problems solved by technology

[0004] In order to solve the defects of the prior art and provide innovative solutions, the purpose of the present invention is to provide a wide-band wide-field imaging system based on a free-form surface micro-nano structure lens, aiming to solve the problems of small field of view and shallow depth of focus in the above-mentioned large-aperture imaging system. , easy defocusing and difficult aberration correction

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