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A method for judging topological charges by using phase singularities

A technology of topological charges and singular points, applied in the field of judging topological charges by using phase singular points

Active Publication Date: 2018-12-21
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above discussion is limited to the case where the superposition of single or two vortex beams can be detected

Method used

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  • A method for judging topological charges by using phase singularities
  • A method for judging topological charges by using phase singularities
  • A method for judging topological charges by using phase singularities

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Embodiment 1

[0060] Select the theoretical formula for the superposition of n vortex beams in an arithmetic sequence (with a tolerance of Δ), and discuss the position of the phase singularity of the superposition of multiple Laguerre Gaussian (LG) beams;

[0061] Laguerre Gaussian (LG) beam superposition can present different intensity and phase distribution characteristics. According to the geometric relationship of multiple LG beams, when the central light intensity is zero and the phase of the light wave cannot be determined, the structure of the dark spot is formed, that is, the phase singularity. Through numerical calculation and analysis, it is considered that the n beams are distributed in an arithmetic sequence, that is, the arithmetic difference is Δ Superposition of LG beams, angular solution of phase singularity θ i Values ​​are:

[0062]

[0063] In a vortex beam, θ i The value range is 0i <2π. Therefore, the value of k is:

[0064]

[0065] Among them, k is a paramet...

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Abstract

The invention discloses a method for judging topological charges by using phase singularities. The method comprises the steps of: step 1, selecting n beams of vortex beams in an arithmetic progressionand setting an equaldifference as Delta; step 2, performing a superposition of Laguerre-Gaussian mode for the distributed n beams of the vortex beams in the arithmetic progression to produce a composite vortex; step 3, simulating the composite vortex of the arithmetic progression to obtain a simulation diagram; and step 4, judging the topological charges of the composite vortex according to lightintensity distribution of the composite vortex simulation diagram obtained in step 3. According to the method for judging the topological charges by using the phase singularities, a number and a position of the phase singularity of the composite vortex beams after the multi-vortex superposition of the topological charges inarithmetic series is obtained; the topological charges in arithmetic series are acurately judged by phase distribution and an evolution principle of singularity feature, thereby providing a new idea for vortex beams detection.

Description

technical field [0001] The invention belongs to the field of wireless laser communication, and relates to a method for judging topological charges by using a phase singularity. Background technique [0002] The vortex beam is a beam with a helical phase distribution, which has a special optical field with a unique spiral phase structure and novel topological properties; when the light interference is destructive, the central intensity is zero and the phase of the light wave cannot be determined. The structure of the dark spot is It is a phase singularity; the wavefront of the beam revolves around the singularity and is in a spiral shape perpendicular to the direction of propagation, with helicity and singularity. [0003] Since the composite vortex produced by the superposition of multiple vortex lights contains different values ​​of topological charges and diverse phase distributions, it can transmit multiple signals to improve communication capacity and has confidentiality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02B27/09
CPCG02B27/0012G02B27/0927
Inventor 柯熙政赵杰吴加丽
Owner XIAN UNIV OF TECH
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