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Method and device for generating radially polarized array beams

A polarization array and beam technology, applied in optics, optical components, instruments, etc., can solve problems that have never been reported, and achieve the effect of improving work efficiency, simple structure, and rich control parameters.

Inactive Publication Date: 2018-04-03
NANJING UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

The generation of array beams can be directly obtained by laser array through beam shaping, or the intensity distribution of beams can be adjusted through beam splitters. However, through the adjustment of the associated characteristics of beams, the method of realizing array beams after the beams are transmitted through the optical system has not been developed. see the report

Method used

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  • Method and device for generating radially polarized array beams
  • Method and device for generating radially polarized array beams
  • Method and device for generating radially polarized array beams

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Embodiment

[0049] see figure 1 , the linearly polarized laser beam passes through the radially polarized light converter. In this embodiment, the laser beam generated by the linearly polarized laser is firstly passed through the radially polarized converter to obtain a radially polarized beam. The high spatial coherence of the laser beam can be considered as fully coherent, the mathematical model of the electric field vector of a radially polarized beam can be expressed as x-polarized TEM 10 with y-polarized TEM 01 Coherent superposition of :

[0050]

[0051] where r 2 =x 2 +y 2 , σ 0 is the beam waist radius, which can be adjusted by a Gaussian amplitude filter.

[0052] According to the unified theory of coherent polarization, the spatial correlation characteristics of radially polarized light are regulated, and a partially coherent radially polarized beam can be expressed as a 2×2 order cross spectral density matrix:

[0053]

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Abstract

The invention relates to a method and a device for generating a radial polarized array beam. The method comprises the steps of performing spatial polarization regulation and control on linearly polarized laser, thereby obtaining a radial polarized beam; reducing spatial association characteristic of the radial polarized beam, and obtaining a radial polarized Gaussian-Schell model beam of which the spatial association characteristic accords with Gaussian distribution; regulating the association characteristic of the radial polarized Gaussian-Schell model beam by means of a two-dimensional comb-shaped function, and obtaining a Gaussian array association radial polarized beam; and after the Gaussian array association radial polarized beam is focused by a thin lens, and obtaining the radial polarized array beam at a focus point. Compared with a single-mode beam, the radial polarized array beam generated through the method and the device has advantages of greatly improving working efficiency in application fields such as particle capture and high-density storage, and realizing high research value.

Description

technical field [0001] The invention relates to radially polarized beams, in particular to a method and device for generating radially polarized array beams. Background technique [0002] In recent years, a kind of spatially non-uniformly polarized beam——radial polarized beam has received extensive attention. Radially polarized light beams have special polarization properties. Compared with uniformly polarized light fields, such as linear polarization, elliptical polarization, and circular polarization, the polarization state distribution of radially polarized light is inhomogeneous, and its electric field vibration has perfect rotational symmetry characteristics, and The intensity at the center of the light field is zero. In recent years, theoretical and experimental studies have found that radially polarized beams have some new features compared with general uniformly polarized beams, such as the minimum spot area of ​​"tightly focused" radially polarized beams can reach ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09G02B27/28
CPCG02B27/0927G02B27/0955G02B27/0988G02B27/283G02B27/288
Inventor 王静朱时军李振华
Owner NANJING UNIV OF SCI & TECH
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