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Method and device for generating tunable self-split array vortex beam

A technology of vortex beam and generation method, applied in optics, optical components, instruments, etc., can solve the problem of undiscovered generation of array vortex beam, etc.

Inactive Publication Date: 2018-11-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, no method for generating arrayed vortex beams has been found in the prior art

Method used

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  • Method and device for generating tunable self-split array vortex beam
  • Method and device for generating tunable self-split array vortex beam
  • Method and device for generating tunable self-split array vortex beam

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Embodiment

[0039] In this embodiment, based on the unified theory of partial coherence and partial polarization, the order cross spectral density matrix of random beams

[0040] W(r 1 ,r 2 ) matrix is ​​expressed as:

[0041] W(r 1 ,r 2 )=* (r 1 )E(r 2 )> (1)

[0042] represents the average in the system, * represents the complex conjugate;

[0043] The general formula of the cross spectral density matrix element of the arrayed vortex beam is expressed as:

[0044]

[0045] The correlation function of the source field rectangular array is expressed as

[0046]

[0047] The correlation characteristics of source field radial array are expressed as

[0048]

[0049] where l is the topological charge, φ′ 1 , φ′ 2 is the light source plane position r' 1 , the phase angle of r′, is the angle variation, M′, N′ are the selected order of the radial array, n x , n y are the positions of the Gaussian array, M and N are the selected order of the radial array, n and m are the ...

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Abstract

The invention relates to a method and device for generating a tunable self-split array vortex beam. The method includes the following steps that: a helium-neon laser is adopted to generate a laser beam, the laser beam is expanded by a beam expander, the correlation characteristic of the beam is modulated through a spatial light modulator, so that a beam having an array correlation characteristic can be obtained; the coherence of the beam is reduced through rotating frosted glass, so that a partially coherent beam having the array correlation characteristic can be obtained; the partially coherent beam having the array correlation characteristic passes through a Gaussian amplitude filter, so that an array-correlated Gaussian beam is obtained; the Gaussian beam passes through a vortex phase plate, so that an array-correlated vortex Gaussian beam can be obtained; and an array vortex beam is obtained on a far field by means of focusing. With the method and device of the invention adopted, the research of the beam with special coherence in aspects such as transmission, imaging and interaction with matters can be promoted, and beam types can be increased.

Description

technical field [0001] The invention relates to a method for generating array vortex beams, in particular to a method and device for generating tunable self-split array vortex beams. Background technique [0002] Phase is an important characteristic of beams. Compared with ordinary beams, vortex beams have a special phase structure and phase singularity, and the light intensity at the center of the vortex is zero. This special phase characteristic makes vortex beams more The beam has more characteristics. In recent years, the vortex beam has attracted more and more attention from the academic community because of its unique properties. It has a lot of practical research value and application prospects. , optical communications, cold atoms, particle waveguides, biomedicine, particle acceleration and other fields have broad application prospects. [0003] As a special new type of beam, the vortex beam is characterized by a spiral wavefront structure, a circular distribution o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09G02B26/06
CPCG02B26/06G02B27/0927
Inventor 朱时军张纪鹏王静陆健李振华
Owner NANJING UNIV OF SCI & TECH
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