Refrigerating compact unobstructed free-form optical system

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...

AI Technical Summary

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 stop matching of the cooling-type off-axis reflective optical system, and realizes cooling-type optical system by using free-form surface and secondary imaging technology. Compact design of the optical system

Images