Two-sided reflection movable mirror interferometer

Abstract

A double-sided movable reflecting mirror interferometer comprises a beam splitter, two fixed plane mirrors and a double-sided movable reflecting mirror which is a plane parallel glass sheet, and both sides of the glass sheet are plated with reflecting film; the double-sided movable reflecting mirror is parallel to the half-reflection surface of the beam splitter; a first plane mirror and a second plane mirror are symmetrical to the half-reflection surface of the beam splitter; the double-sided movable reflecting mirror makes straight reciprocating motion along the normal direction of the half-reflection surface of the beam splitter; the optical path difference is four times longer than the displacement (relative to the position of zero optical path difference) of the double-sided movable reflecting mirror. The interferometer has compact structure, small volume and low cost, and is suitable for high resolution Fourier transform spectrometers of various spectral regions.

Description

technical field [0001] The invention relates to an interferometer, in particular to a double-sided reflective 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 di...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a double-sided reflecting moving mirror interferometer, which solves the technical problems of plane moving mirror tilting, single scanning cat glasses and single scanning angle reflector traversing in the background technology, and the optical path difference is double-sided reflection Four times of the moving mirror displacement (relative to its zero optical path difference position), the accuracy is greatly improved compared with the Michelson interferometer in the application of the Fourier transform spectrometer; under the same conditions of manufacturing error and motion error, it can be Gain higher instrument resolution

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