A method and device for generating a handed polarization vector beam with vortex phase based on an axicon mirror

Abstract

Provided are a method and device for generating a rotating polarization vector light beam with a vortex phase based on axis cone mirrors. The device is composed of two symmetrically-placed axis cone mirrors and a cylindrical inner reflector which are arranged in a nesting mode; a circular polarization light beam with plane wave front is used for vertical incidence, and incident light irradiates the cylindrical inner reflector at a specific divergence angle after the incident light is deflected by the first axis cone mirror; the incident angle of the incident light to the cylindrical inner reflector satisfies the Brewster's law, and the reflection light of the incident light only reserves an S polarization component (the vibration direction is perpendicular to the incident plane); the reflection light continues to focus and irradiate the second axis cone mirror at the same angle, and a rotation polarization vector light beam with plane wave front is obtained after deflection, wherein the absolute value of the phase vortex topological-charge of the light beam is 1. The method and the device have the advantages of a simple structure, a high anti-seismic performance, high conversion efficiency and integration, and the device can be built both inside a laser cavity and outside the laser cavity, so that it is achieved that the circular polarization light beam is converted to the rotation polarization vector light beam with the phase vortex topological-charge absolute-value of 1.

Description

technical field [0001] The invention relates to a method and a device for generating a hand-polarized vector beam with a vortex phase based on an axicon mirror, and belongs to the technical field of vector beam modulation. Background technique [0002] Because the vector beam with non-uniform polarization distribution has characteristics that traditional uniformly polarized beams (such as linearly polarized beams and circularly polarized beams) do not have, it has attracted more and more attention in research in recent years[ See literature 1-2]. In particular, the vector beam with centrosymmetric polarization distribution can produce very peculiar focusing characteristics, so that the vector beam can be excited in surface plasmons [see literature 3], optical tweezers [see literature 4], laser micromachining [see literature 5], etc. field has been widely applied. Among vector beams with centrosymmetric polarization distribution, the two most typical examples are radially p...

AI Technical Summary

Problems solved by technology

[0004] The active generation of vector beams has the advantage of high conversion efficiency, but there are certain deficiencies in flexibility. Generally, only the simplest vector beams of radial polarization and helical polarization in the cylindrical symmetric mode can be obtained; the passive generation method can By changing the optical path structure, replacing optical components, or using dynamic modulation of optical components to achieve different modes of vector beams according to specific needs, but it also has the problems of poor shock resistance, complex structure, and low conversion efficiency.

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