A Double Filter Transverse Shearing Interferometer and Its Based Spectral Imaging Method

Abstract

The invention provides a double-filter transverse shearing interferometer and a spectral imaging method based on it, which solves the problem of linearity error introduced by the existing interferometer due to the movement of mechanical moving parts. System, first polarizer, first acousto-optic tunable filter, second acousto-optic tunable filter, second polarizer, Fourier transform imaging objective lens, photodetector; the front optical collimation system is placed in the optical path At the front end, the photodetector is located on the image plane of the Fourier transform imaging objective lens; the reflected, radiated or transmitted light of the measured far-field target is polarized by the first polarizer to form linearly polarized light after passing through the front optical collimation system, Then the acousto-optic interaction occurs in the first acousto-optic tunable filter and the second acousto-optic tunable filter in turn, and the output light is focused on the target surface of the photodetector by the Fourier transform imaging objective lens after passing through the second polarizer Interference fringes are formed.

Description

technical field [0001] The invention relates to an interferometer, in particular to an acousto-optic modulated double-filter transverse shear interferometer. Background technique [0002] When the sound wave is transmitted in the acousto-optic medium at a certain speed, a strain force is generated due to the sound wave disturbance, and the strain force will cause the molecules in the medium to be squeezed to a certain extent, thereby changing the intrinsic position of the molecules, so the acoustic The refractive index of the optical medium changes accordingly, that is to say, this process is equivalent to that sound waves can change the refractive index of the acousto-optic medium, which in turn leads to corresponding changes in some properties of light. The incident light is diffracted by ultrasonic waves in the crystal, which can be regarded as the incident light is reflected by many parallel atomic planes in the crystal to form a diffraction phenomenon. Acousto-optic tu...

AI Technical Summary

Problems solved by technology

[0019] The object of the present invention is to provide a double-filter transverse shearing interferometer and a method for spectrally imaging a target beam using it. The double-filter transverse shearing interferometer is electronically tuned, all solid-state, and has no mechanically moving parts. Solve the problem of linearity error introduced by the existing interferometer due to the movement of mechanical moving parts

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