Catadioptric afocal optical system
An afocal optical system and catadioptric technology, applied in the optical field, can solve the problems of complex system type, difficult installation and adjustment, and difficult design, and achieve the effect of simple system structure, compact structure and good adaptability
Pending Publication Date: 2022-03-25
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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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
[0004] For the design of large-aperture, multi-band, and common-aperture afocal optical systems, traditional transmissive optical systems are limited by materials and coating technology, making the design difficult, complex and large in size. , Difficulty in installation and adjustment and high processing cost, while the use of catadioptric afocal optical path has the problems of complex system type and difficult correction of chromatic aberration
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[0036] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same blocks are denoted by the same reference numerals. With the same reference numerals, their names and functions are also the same. Therefore, its detailed description will not be repeated.
[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.
[0038] The present invention proposes a catadioptric infrared afocal optical system, which compresses the incident parallel wide beams from the target into parallel thin beams, and an imaging objective lens can be placed behind the afocal op...
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The invention provides a catadioptric afocal optical system. The catadioptric afocal optical system comprises a first reflector, a second reflector, a chromatic aberration correction lens group and a fourth reflector, after being reflected twice by the first reflecting mirror and the second reflecting mirror, the light beam passes through a central hole of the fourth reflecting mirror to enter the chromatic aberration correction lens group, is refracted by the chromatic aberration correction lens to enter the third reflecting mirror, and is reflected twice by the third reflecting mirror and the fourth reflecting mirror to pass through the chromatic aberration correction lens again; and the light beam enters the field lens group through the center hole of the third 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 mirror and is emitted in parallel after being refracted by the collimating mirror. The optical system provided by the invention can receive light rays of visible light and medium-wave infrared bands without generating chromatic aberration, has the advantages of large aperture, multiple bands and common aperture, and is compact in structure, and the installation and adjustment difficulty of the system is reduced to a great extent as the optical elements are positioned on the same optical axis.
Description
technical field [0001] The invention relates to the field of optical technology, in particular to a catadioptric 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 mirror rotation, such as t...
Claims
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Login to View More IPC IPC(8): G02B17/08G02B27/30
CPCG02B17/084G02B17/0896G02B27/30
Inventor张新史广维
OwnerCHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI