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Distorted vortex beam self-adaptive precorrection method and system based on GS algorithm

An adaptive pre-correction, vortex beam technology, applied in the field of optoelectronics, can solve the problems of high price and unfavorable practical application, and achieve the effect of simple operation and reduced system cost

Inactive Publication Date: 2016-10-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods require the use of wavefront analyzers, which are very expensive and are not conducive to practical applications

Method used

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  • Distorted vortex beam self-adaptive precorrection method and system based on GS algorithm
  • Distorted vortex beam self-adaptive precorrection method and system based on GS algorithm
  • Distorted vortex beam self-adaptive precorrection method and system based on GS algorithm

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Effect test

Embodiment 1

[0055] Example 1, Adaptive pre-correction of a single-mode vortex beam.

[0056] In this embodiment and the following embodiments, the power spectrum inversion method is used to simulate atmospheric turbulence, and then phase distortion is introduced. In this embodiment, a single-mode vortex beam is incident, and its angular quantum numbers are +1, +2, +3, +4 and +5 respectively. After the Gaussian probe beam and the vortex beam are separated by the polarizing beamsplitter prism in the receiving module, the vortex beam is received by the area array detector. The experimental results are as follows Figure 6 shown. Figure 6 In the figure, from top to bottom are the light intensity distributions without turbulence, with turbulence but no pre-correction, and with turbulence and pre-correction; from left to right are +1-+5-order vortex beams. From Figure 6 It can be seen that the light intensity distribution is improved well before and after pre-calibration.

[0057] At the ...

Embodiment 2

[0058] Embodiment 2, adaptive pre-correction of multi-mode multiplexed vortex beams.

[0059] In this embodiment, multi-mode multiplexed vortex beams are incident, which are combined beams of +2, -3 order, +4, -4 order and +7, -9 order vortex beams respectively. After the Gaussian probe beam and the vortex beam are separated by the polarizing beamsplitter prism in the receiving module, the vortex beam is received by the area array detector. The experimental results are as follows Figure 8 shown. Figure 8 In the figure, from top to bottom are the light intensity distributions without turbulence, with turbulence but no pre-correction, and with turbulence and pre-correction; from left to right are three kinds of multi-mode multiplexing vortex beams. From Figure 8 It can be seen that the light intensity distribution is improved well before and after pre-calibration.

[0060] At the same time, in order to better evaluate the phase recovery of the vortex beam before and after ...

Embodiment 3

[0061] Example 3, the variation of the model purity after pre-calibration with the number of iterations in the host.

[0062] In the present invention, the host computer calculates the number of iterations of the pre-correction phase screen, which will affect the effect of the pre-correction. In this embodiment, we have measured +2-order vortex beams (D / r 0 =2.47), the model purity after pre-correction, such as Figure 10 shown. It can be seen that the more iterations, the higher the model purity.

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Abstract

The invention discloses a vortex beam self-adaptive pre-correction method and system based on GS algorithm. The vortex beam adaptive pre-correction system provided by the present invention is composed of a transmitting module, a receiving module, a data transmission module and a host. Based on the GS algorithm, the invention calculates the pre-correction phase screen by detecting the light intensity distribution of the Gaussian probe beam, and loads the pre-correction phase into the vortex beam of the transmitting module, thereby compensating the phase distortion caused by the inhomogeneity of the medium. Its principle can be understood as the "distortion" introduced by the pre-correction screen, and the "distortion" is "compensated" by the inhomogeneous medium. Experiments show that after the adaptive pre-correction system, the mode purity of the vortex beam has been significantly improved. The system structure of the invention is stable, easy to operate, and can realize real-time correction of phase distortion. At the same time, the wavefront analyzer and other devices are omitted in the system, which greatly reduces the cost.

Description

technical field [0001] The present invention relates to the field of optoelectronic technology, in particular to a method and system for adaptive pre-correction of distorted vortex beams based on GS algorithm Background technique [0002] The vortex beam is a new type of beam with a helical wavefront structure. Compared with the Gaussian beam, the cross-sectional light intensity distribution of the vortex beam is a hollow ring, because the phase is uncertain in the center of the beam and there is a phase singularity. Common vortex beams are Laguerre-Gaussian beams and Bessel-Gaussian beams. The vortex beam carries orbital angular momentum, and the orbital angular momentum carried by each photon is in, is the reduced Planck constant; l is the angular quantum number, also known as the topological charge, which is the eigenvalue of the orbital angular momentum. Theoretically, the angular quantum number l can take any non-zero integer, and its corresponding eigenstates are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J9/00
CPCG01J9/00
Inventor 高春清付时尧张世坤王彤璐
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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