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
CN106017697AInactive Publication Date: 2016-10-12BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2016-10-12
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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