AOTF optical system with image drift compensation

Abstract

The invention relates to an acousto-optic tunable filter (AOTF) optical system with image drift compensation. The system comprises an objective lens, an ocular lens and a TEO2 crystal which are positioned in the direction of an optical path, a +1 level optical path and a -1 level optical path on which a radio frequency signal is added to an energy converter, an acoustic wave is excited and transmitted to the TEO2 crystal, and the wave with the wavelength meeting the acousto-optic interaction condition is subjected to Bragg diffraction, and is diffracted from the TEO2 crystal at a certain diffraction angle, collecting lenses which are positioned on the +1 level optical path and the -1 level optical path, and combined optical wedges which are positioned at the front ends of the collecting lenses and can correct diffraction optical drift outside the TEO2 crystal before the +1 level optical path and the -1 level optical path enter the collecting lenses. The characteristics of non-collinear AOTF all-solid parts are completely realized, and the technical problem of the image drift compensation is well solved.

Description

technical field [0001] The invention relates to an AOTF optical system, in particular to a non-collinear acousto-optic tunable filter AOTF optical system with image drift compensation. Background technique [0002] Non-collinear acousto-optic tunable filter splitting principle: [0003] Such as figure 1 As shown, the radio frequency driving signal is converted into an ultrasonic signal of the corresponding frequency after passing through the electroacoustic transducer, and forms a diffraction grating after passing through the uniaxial birefringent crystal, and is absorbed by the absorber at the other end. [0004] When white light is incident on a uniaxial birefringent crystal, the wavelength components that meet the conditions of acousto-optic interaction undergo Bragg diffraction, while the rest of the wavelength components remain unchanged. Due to the birefringence of the crystal, the diffracted light is divided into two beams, that is, the +1 order and -1 order diffrac...

AI Technical Summary

Problems solved by technology

However, when the wavelength of the non-collinear acousto-optic tunable filter AOTF is tuned, the diffraction angle will change with the wavelength, causing the images of the same target in different spectral bands to shift relative to each other, so that each image of the area array CCD cannot be effectively used. meta and affect data cube refactoring

[0006] Due to the inherent dispersion of acousto-optic crystals, the drift of diffracted light will cause image drift in imaging, which poses a great obstacle to imaging applications.

The wedge angle compensation of adding wedge angle compensation on the exit surface of TEO2 crystal reported in previous literature can only compensate one way, and it can only be applied to the case of incident polarized light, which is a scheme of using a rotating plane mirror

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