Refrigerating compact unobstructed free-form optical system

An optical system, unobstructed technology, used in optics, optical components, instruments, etc., can solve problems such as cold stop matching, and achieve the effect of improving the working distance and small volume

Active Publication Date: 2019-06-21
西安应用光学研究所
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Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention proposes a cooling-type compact and unobstructed free-form surface optical system, which solves the problem of cold ...

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  • Refrigerating compact unobstructed free-form optical system
  • Refrigerating compact unobstructed free-form optical system
  • Refrigerating compact unobstructed free-form optical system

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Embodiment Construction

[0021] The purpose of the present invention is to solve the problem of cold stop matching of cooling type off-axis reflection optical system, and realize the compact design of cooling type optical system by using free-form surface and secondary imaging technology.

[0022] In order to achieve the above object, the present invention provides a cooling type compact unobstructed free-form surface optical system and a design method. The free-form off-axis three-mirror technology is used to make the main light overlap three times in the area formed by three mirrors, realizing the unobstructed and compact design of the cooled off-axis reflective optical system.

[0023] The cooling type compact unobstructed free-form surface optical system includes: an aperture, a first reflector, a second reflector and a third reflector. The three mirrors are all XY polynomial or Zernike polynomial free-form surfaces, wherein the first and third mirrors have positive power, and the second mirror ha...

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Abstract

The invention discloses a refrigerating compact unobstructed free-form optical system comprising a first reflecting mirror, a second reflecting mirror and a third reflecting mirror arranged in sequence. All three reflecting mirrors are free-form surfaces and use an XY polynomial or Zernike polynomial. Inclination or simultaneous existence of the eccentricity and inclination exists relative to thecoaxial system. The three reflecting mirrors are arranged in a circle; the light intersects multiple times in space; and the structure is compact. The incident light is not shielded by the three reflecting mirrors and can reach the final image plane completely. An intermediate image plane exists in the optical path between the second reflecting mirror and the third reflecting mirror and is adjacent to the second reflecting mirror. A system diaphragm is arranged near the first reflecting mirror. Therefore, the size of the traditional off-axis three-reflecting system is reduced; the secondary imaging technology is realized in compact space, so that the exit pupil is located behind the third reflecting mirror outside the overlapped optical path; the system can match the refrigerating detectorcooling aperture. The 100% of cold diaphragm efficiency is realized and the target acting distance is increased.

Description

technical field [0001] The invention relates to the technical field of optical system design, and mainly relates to an off-axis reflective optical system, in particular to a compact unobstructed free-form surface optical system which can be used for cooling detectors. Background technique [0002] Large-diameter (≥100mm) optical transmission materials are expensive, and it is difficult to guarantee the uniformity of refractive index and transmittance. The reflective optical system has no chromatic aberration, wide imaging spectral range, and matching with structural materials can achieve adiabatic difference. Therefore, large-aperture optical systems usually adopt reflective structures. However, the coaxial reflective system has central obstruction, which affects the system’s received energy and imaging quality. The off-axis reflective system can avoid these problems. However, the traditional off-axis three-mirror optical system is not compact enough in space and cannot mee...

Claims

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Application Information

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IPC IPC(8): G02B17/06
Inventor 李元周晓斌李明星何玉兰李艳孙涛辉康文莉王楠茜宫经珠韩梅郭羽
Owner 西安应用光学研究所
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