Novel double-cat eye movable lens interferometer

Abstract

A novel double-cat-eye moving mirror interferometer includes a beam splitter, four fixed flat reflectors, and two cat-eye-scanning mirrors fixed together by a rigidity structure back to back as an individual motion component; two secondary mirrors of the two cat-eye moving mirrors are all flat mirrors, the distance between primary mirrors is minimal; the secondary mirrors of the two cat-eye moving mirrors and a half reflecting surface of the beam splitter are parallel with each other; the first flat mirror and the third flat mirror are symmetric relative to the half reflecting surface of the beam splitter; the second flat mirror and the fourth flat mirror are symmetric relative to the half reflecting surface of the beam splitter; the second flat mirror, the fourth flat mirror and the half reflecting surface of the beam splitter are parallel with each other; the double-cat-eye moving mirror makes reciprocating motion in a line along a normal line direction of the half reflecting surface of the beam splitter; the optical path difference is eight times of the displacement of the double-cat-eye moving mirror. The interferometer eliminates incline and sideslip problem completely, and is suitable for high resolution Fourier transform spectrometer of various spectrum regions.

Description

technical field [0001] The invention relates to an interferometer, in particular to a novel double cat-eye moving mirror interferometer applied to a high-resolution Fourier transform spectrometer. Background technique [0002] Fourier transform spectrometers have the advantages of high spectral resolution, high throughput, and multiple channels. The biggest problem affecting the application of Michelson interferometers in Fourier transform spectrometers is the tilt of the plane moving mirror during scanning. [0003] Using cat's-eye retroreflectors or cube-corner mirrors instead of planar moving mirrors can solve the tilt problem very well, the only disadvantage is that there is a lateral offset problem with a single cat's-eye retroreflector or a single scanning corner mirror . Another approach is to use a dynamic correction servo system, but the higher the resolution, the higher the probability of failure of this correction system, and the system is very sensitive to distu...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of novel double cat's-eye moving mirror interferometer, which solves the technical problems of plane moving mirror inclination, single scanning cat's glasses and single scanning angle reflector traversing in the background art. The accuracy is greatly improved in the application; the optical path difference is 8 times of the displacement of the double cat's eye moving mirror (relative to its zero optical path difference position), and a higher instrument resolution can be obtained under the same conditions of manufacturing error and motion error

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