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Vortex beam wavefront phase correction method based on Gerchberg-Saxton algorithm

A vortex beam, wavefront phase technology, applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., to achieve the effect of alleviating crosstalk between modes and alleviating phase distortion

Pending Publication Date: 2022-04-29
XIDIAN UNIV
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Problems solved by technology

[0004] So far, how to correct Laguerre-Gaussian (LG) beams has remained a challenge due to their complex intensity distribution and helical phase

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  • Vortex beam wavefront phase correction method based on Gerchberg-Saxton algorithm
  • Vortex beam wavefront phase correction method based on Gerchberg-Saxton algorithm
  • Vortex beam wavefront phase correction method based on Gerchberg-Saxton algorithm

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, where the schematic embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0030] A kind of vortex beam wavefront phase correction method based on Gerchberg-Saxton algorithm proposed by the present invention comprises the following steps:

[0031] Step 1: Use the step-by-step beam propagation method to construct the transmission model of the adaptive optics system based on the vortex beam, and use the power spectrum inversion method to simulate the phase disturbance caused by atmospheric turbulence, and obtain the distortion at the transmission distance z in the time domain Field Strength Distribution of Transmitted LG Beam The field intensity distribution of the distorted probe LG beam at the transmission distance z in the time domain

[0032] In the proces...

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Abstract

The invention discloses a vortex light beam wavefront phase correction method based on a Gerchberg-Saxton algorithm. The method comprises the following steps: firstly, constructing an adaptive optical system transmission model based on a vortex beam, and simulating phase disturbance caused by atmospheric turbulence to obtain field intensity distribution of a distorted transmission beam and a detection beam in a time domain; and then taking the distorted detection light beam as the input of a vortex light beam wavefront phase correction method based on a Gerchberg-Saxton algorithm, iteratively calculating a random phase similar to atmospheric turbulence, and further obtaining a corrected phase mask. A spatial light modulator is loaded on a distorted OAM light beam, so that OAM light beam inter-mode crosstalk caused by atmospheric turbulence is relieved. The wavefront phase correction method is good in correction effect and can effectively improve the mode purity of transmitted LG light beams.

Description

technical field [0001] The invention belongs to the technical field of wireless optical communication, and specifically proposes a vortex beam wavefront phase correction method based on the Gerchberg-Saxton algorithm, and calculates the compensation phase by using the method, and then loads it on the On the distorted transmitted LG beam, the distortion of the LG beam caused by atmospheric turbulence and the crosstalk between modes can be alleviated. Background technique [0002] Due to the increase in data users and online activity, the demand for data rates and bandwidth is increasing exponentially. Free-space optical communication technology is a promising technology to meet this need. Compared with optical fiber communication, free space optical communication technology has higher bandwidth, smaller beam divergence and higher security, and it is easy to install and no license is required for communication. In order to further increase the information transmission capabi...

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Application Information

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IPC IPC(8): H04B10/11H04B10/073H04B10/61
CPCH04B10/11H04B10/073H04B10/6165
Inventor 王平李爽潘宇婷
Owner XIDIAN UNIV
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