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Method for measuring topological charge numbers of partial coherent elegant Laguerre-Gaussian beams

A technology for measuring partial and topological charges, applied in the field of optical measurement, can solve the problems of measuring the topological charges of Laguerre Gaussian beams, which have not been seen to measure coherent complex quantities, and achieve the effect of simple measurement methods

Pending Publication Date: 2019-03-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

But so far, no method has been seen to measure the topological charge of a partially coherent complex Laguerre-Gaussian beam

Method used

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  • Method for measuring topological charge numbers of partial coherent elegant Laguerre-Gaussian beams
  • Method for measuring topological charge numbers of partial coherent elegant Laguerre-Gaussian beams
  • Method for measuring topological charge numbers of partial coherent elegant Laguerre-Gaussian beams

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Embodiment Construction

[0036] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments. 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.

[0037] Such as figure 1 as shown,

[0038] 1. A device for generating a partially coherent complex Laguerre-Gaussian beam, the structure of which includes:

[0039] The laser beam sent by the He-Ne laser with a wavelength of 632.8nm passes through the collimating beam expander 2, the first convex lens 3, the rotating ground glass plate 4, the second convex lens 5 and the Gaussian amplitude filter 6 in order to generate a Gaussian Schell beam ( partially coherent light). Then through the spatial light modulato...

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Abstract

The invention discloses a method for measuring topological charge numbers of partial coherent elegant Laguerre-Gaussian beams, and belongs to the technical field of optical measurement. The method comprises the following steps of S1, utilizing a partial coherent elegant Laguerre-Gaussian beam generating device for generating the partial coherent elegant Laguerre-Gaussian beams; S2, utilizing a cross correlation function generating device for obtaining interference beams; S3, utilizing an observing device for recording and observing interference patterns to obtain the topological charge numbersof the partial coherent elegant Laguerre-Gaussian beams. By means of the method, the technical blank that currently, the topological charge numbers of partial coherent elegant Laguerre-Gaussian beamscannot be measured is filled up. The measuring method is simple and visual, and the topological charge numbers can be obtained through observation without data processing.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a method for measuring the topological charge of a partially coherent complex quantity Laguerre Gaussian beam. Background technique [0002] Complex beams are special solutions of the wave equation under the paraxial approximation, and this class of beams represents a broad class of beams. The complex Laguerre-Gaussian beam is a typical complex Laguerre-Gaussian beam. Compared with the standard Laguerre-Gaussian beam, the complex Laguerre-Gaussian beam has better symmetry. In its expression, the Gaussian function and Laguerre polynomials have the same complex factors [J.Opt.Soc.Am.A2(6),826-829(1985).]. Due to this special property, complex Laguerre-Gaussian beams have important applications in other optical resonators and transport problems [Opt. Lett.38(6), 809-811(2013)]. In 2009, Wang Fei and others extended the complex Laguerre-Gaussian beam to the field of par...

Claims

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Application Information

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IPC IPC(8): G01J9/02
CPCG01J9/02
Inventor 杨元杰董淼赵琦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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