Large-view-field off-axis three-mirror optical system

Abstract

The invention discloses a large-view-field off-axis three-mirror optical system. The system comprises a first mirror with the negative lens power, a second mirror with the negative lens power, a third mirror and a detector with the positive lens power, wherein the first mirror is opposite to a target light beam incident port, the second mirror is arranged on the reflection optical path of the first mirror, and an aperture diaphragm is arranged on the surface of the second mirror; the third mirror is arranged on the reflection optical path of the second mirror; the detector is used for receiving reflection light of the third mirror. The negative-negative-positive anti-far-distance mode is adopted to the structure of the large-view-field off-axis three-mirror optical system, off-axis light large in view field firstly passes the mirrors with the negative lens power and is diverged, the view field of emitted light is reduced relative to the mirror with the positive lens power, that is, more off-axis light larger in view field can enter the mirror with the positive lens power and is received by the detector, and accordingly the aim of enlarging the view field is achieved.

Description

technical field [0001] The invention relates to the technical field of optical design, in particular to a large field of view off-axis three-mirror optical system. Background technique [0002] Reflective optical systems are widely used in space optical systems due to the advantages of no chromatic aberration, foldable system, and light weight. The reflective system can be divided into two-mirror, three-mirror, and four-reflective systems according to the number of mirrors; it can be divided into coaxial and off-axis systems according to the optical axis; the off-axis three-mirror optical system introduces three mirrors The aspheric coefficient corrects spherical aberration, coma, and astigmatism, corrects the curvature of the image plane by rationally allocating the focal power of the three mirrors, and realizes the system without obstruction through the off-axis of the aperture or the off-axis of the field of view; the three-mirror system can realize relatively Better abe...

AI Technical Summary

Problems solved by technology

[0003] The traditional off-axis three-mirror optical system adopts the "positive-negative-positive" form in the optical structure, which can make the system compact and conducive to miniaturization, but it is not conducive to the design of large field of view, and can only be used in long strips of field of view. Internal imaging, the current domestic off-axis three-mirror system has a wide field of view of no more than 17°, and a narrow field of view of no more than 1°

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