Method and device for generating radial polarized array beam

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 ...

AI Technical Summary

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

Images