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Beam-expanded collimation light detection method

A detection method and collimated light technology, applied in the field of image processing, can solve the problems of not clearly giving the evaluation of the quality of the laser beam, and the concept of evaluating the quality of the laser beam is not very clear.

Inactive Publication Date: 2018-05-18
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Description
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  • Application Information

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Problems solved by technology

However, the concept of evaluating the quality of laser beams is not very clear. So far, relevant personnel have not clearly given the definition of evaluating the quality of laser beams.

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  • Beam-expanded collimation light detection method
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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] Presentation of existing interferometric techniques:

[0025] 1. Transverse Shear Interferometry

[0026] The principle of the transverse shearing interferometer is that the beam is divided into two beams after passing through the transverse shearing system. Because of the transverse shearing amount, the two beams will overlap, and interference fringes will be generated in the overlapped part. By controlling the shearing The amount can control the numb...

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Abstract

The invention discloses a beam-expanded collimation light detection method, and relates to the technical field of image processing. The method comprises that an interferogram is obtained via shear interferometry, and spatial filtering is carried out on interference fringes to obtain filtered interference fringes; a spectrogram is obtained from the filtered interference fringes via Fourier transform; a filtering window is arranged to carry out frequency-domain filtering on the spectrogram to obtain a filtered spectrogram; inverse Fourier transform is carried out on the filtered spectrogram to obtain a wrapping phase of the interferogram, and a least squares method is used to unpack the wrapping phase to obtain a phase unpacked graph of the interferogram; whole-side de-inclination is carriedout on the phase unpacked graph to obtain a real phase of the interferogram obtained via shear interferometry; and Zernike wavefront reconstruction is carried out on the real phase to obtain wave surface information of the interferogram.

Description

technical field [0001] The present invention relates to the technical field of image processing, and in particular to a detection method for beam expanding collimated light. Background technique [0002] Laser is widely used as a light source for optical interferometry due to its characteristics of light energy concentration, directivity and good monochromaticity. However, due to the Gaussian distribution of the laser beam, its interference will produce an additional phase difference. Therefore, in optical interferometry, it is often necessary to expand and collimate the laser beam emitted by the laser and compress the far-field divergence angle to reduce the additional phase difference. Measurement error caused by phase difference. [0003] The technical index of laser beam quality is very important in laser applications, and its application is very extensive. However, the concept of evaluating the quality of laser beams is not very clear. So far, the relevant personnel h...

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Application Information

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IPC IPC(8): G01M11/00
CPCG01M11/00
Inventor 王大森聂凤明张广平裴宁
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH