Visible light-medium wave infrared afocal optical system

Abstract

The invention provides a visible light-medium wave infrared afocal optical system. The visible light-medium wave infrared afocal optical system comprises a reflection type objective lens group and a transmission type eyepiece group, the reflective objective lens group comprises a first reflector and a second reflector; the transmission type eyepiece group comprises a field lens group and a collimating lens group; the first reflector is provided with a center hole. The second reflecting mirror is arranged in front of the first reflecting mirror and forms a Cassegrain structure with the first reflecting mirror; the field lens group is placed in the center of the first reflector, and the collimating lens group is placed behind the field lens group; the field lens group and the collimating lens group are composed of lenses. The light beam enters the field lens group after being reflected twice by the first reflector and the second reflector, and the field lens group is used for reducing the range of the light beam, so that the light beam with the reduced range enters the collimating lens group and is emitted in parallel after being refracted by the collimating lens group. According to the invention, large-aperture, multi-band and common-aperture imaging is realized, the structure is compact, and the adaptability is good; the method has the advantages of good imaging quality, high transfer function, small distortion and the like.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a visible light-medium wave infrared afocal optical system. Background technique [0002] An afocal optical system is an optical system in which both the incident and outgoing wavefronts are plane waves, and it has no converging and diverging effects on the beam, also known as a telescope system. In addition to being used for traditional telescopes and laser beam expanders, the afocal optical system can also be used as a part of the imaging optical system. Especially in the optical system that needs image motion compensation or image stabilization, the zoom effect of the afocal optical system on the beam is used, and a small-diameter flat mirror (ie, a fast mirror Fast Steering Mirror) is set between the afocal optical system and the imaging optical system. The relative motion between the target and the image during the exposure period of the detector is eliminated by fast mirr...

AI Technical Summary

Problems solved by technology

The off-axis reflective afocal optical path can solve the problem of large aperture, multi-band, and common aperture, but it is difficult to process and assemble, and the processing cost is high. At the same time, the volume is large

[0004] For the design of large-aperture, multi-band, and common-aperture afocal optical systems, traditional transmissive optical systems are limited by materials, making the design difficult, complex and large in size

However, if the off-axis reflective optical path is used, there are problems of difficult processing and assembly and high processing cost, and the volume size is also difficult to control

Images