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Parameter calibration method of acousto-optic tunable filter

A tuning filter, acousto-optic technology, applied in the direction of testing optical performance, etc., can solve the problems that the internal parameters cannot be solved, the grating approximation is not perfect, etc.

Inactive Publication Date: 2010-05-12
BEIHANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a parameter calibration method for acousto-optic tunable filter, to overcome the shortcomings of the existing AOTF calibration method, which only calibrates the apparent parameters, the internal parameters cannot be solved, and the grating approximation is not perfect. The method of least squares method and calibration data, the method of calibrating the internal and external parameters of AOTF by using the exact expression of the optical rotation parameter of the acousto-optic crystal, this method has high precision in internal parameter calculation and grating approximation

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[0029] Such as figure 1 , 2 , Shown in 3, the specific method of calibration AOTF of the present invention is as follows:

[0030] (1) Analyze the principle of the AOTF to be calibrated. The AOTF is mainly composed of an acousto-optic crystal (1) and a transducer (2), such as image 3 shown. The function of the transducer (2) is to convert the electrical signal into an ultrasonic wave in the crystal. Its length is related to the length L of the acousto-optic interaction. The ultrasonic wave has a fixed propagation direction in the crystal. When the wave vector momentum matching condition is satisfied , the incident light will produce Bragg diffraction, and the wavelength of the diffracted light corresponds to the frequency of the electrical signal. Changing the frequency of the electrical signal can change the wavelength of the diffracted light.

[0031] (2) According to AOTF commonly used acousto-optic crystal TeO 2 The birefringence characteristics of its O light and E ...

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Abstract

The invention relates to a parameter calibration method of an acousto-optic tunable filter (AOTF). The calibration data of the wavelength response function, the wavelength frequency tuning relationship, the deflection angle beta, the wavelength relationship and the like of the AOTF are processed according to the principle of the AOTF, a method of combining a parameter theory expression and a least squares principle is adopted to inverse the internal parameters of the AOTF, and an approximation technology of an optical grating of an emergent face is adopted to realize the simulation of a light path of the AOTF. In the invention, the data processing method is novel, the accuracy of a processing result is higher, and the inversed internal parameters of the AOTF can provide an improved basis for the production of the AOTF and provide a light path tracking method for the optical design of a spectrograph of the AOTF.

Description

technical field [0001] The present invention relates to an Acousto-optic Tunable Filter (Acousto-optic Tunable Filter, hereinafter referred to as AOTF) parameter calibration method, combined with parameter calibration data, according to the precise expression of AOTF parameters, to solve AOTF parameters, suitable for AOTF products The index inspection, and the use of transmission gratings to approximate the AOTF spectrum, provide optical design means for the integrated AOTF spectrometer, which belongs to the technical field of hyperspectral imager calibration. Background technique [0002] AOTF is made according to the principle of acousto-optic diffraction, and can rely on changes in the frequency of electrical signals to select wavelengths. The wavelength λ and frequency f satisfy the wavelength-frequency tuning relationship f=f(λ). The spectrometer based on AOTF has the characteristics of miniature, light and small, and programmable, and has been widely used in the field ...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 赵慧洁周鹏威张颖程宣李冲冲
Owner BEIHANG UNIV
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