Total reflection type afocal optical system

Abstract

The invention relates to the technical field of optical imaging, and concretely relates to a total-reflection afocal optical system. The system comprises a first optical path module and a second optical path module which are sequentially arranged along an optical path, the first optical path module comprises a first reflector and a second reflector which are sequentially arranged along the opticalpath, and the second optical path module comprises a third reflector and a fourth reflector which are sequentially arranged along the optical path. According to the system, four reflectors are adopted and all are reflective elements, and light rays of different wave bands can be received without generating chromatic aberration, so the advantages of multiple wavebands and common caliber are achieved; and the four reflectors form the non-coaxial optical system, and incident parallel wide light beams are compressed into parallel thin light beams, so secondary blocking of light rays is avoided, the confocal condition is met, the small imaging distortion characteristic is achieved, the structure is compact, and the adaptability is good.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a total reflection 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 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 mirror rotation, s...

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Problems solved by technology

[0004] For the design of multi-band, common-aperture afocal optical system, the form of the existing transmissive or catadioptric optical system is limited by the material and the design is difficult, while the reflective afocal optical system usually has the problem of secondary occlusion and large imaging distortion

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