Device for generating vector light beam through annular combination half wave plate

Abstract

The invention discloses a device for generating vector light beam through an annular combination half wave plate. According to the invention, a plurality of half wave plates with different fast axis directions and in isosceles trapezoid form an annular combination half wave plate in an approximate circular ring shape in a seamless splicing way, so as to avoid the problem of sharply increased diffraction loss of a central zone due to a great amount of adopted fanshaped half wave plates and then generate the vector light beam with high purity; and when high-order vector light beam needs to be generated, the quantity of the half wave plates can be increased to ensure high purity of the light beam. Compared with the prior art, the device provided by the invention adopts the annular combination half wave plate formed by a plurality of trapezoidal half wave plates, so that the problem of sharply increased diffraction loss of the central zone due to increased plate does does not exist, and accordingly the high-order vector light beam can be ensured to be generated; an annular light beam converter formed by a first axial cone mirror and a second axial cone mirror which are plated with high-reflection gold films is adopted, so as to improve the reflectivity and damage threshold of laser; therefore, the device provided by the invention can be applicable to production of high-power vector light beam.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a device for generating vector light beams. Background technique [0002] Vector beams are a new type of beams that have emerged in recent years. Different from traditional linearly polarized beams and circularly polarized beams with uniform spatial polarization states, the polarization states of vector beams are distributed according to certain rules on the cross-section of the beam. The unique polarization properties of vector beams make them have important application prospects in modern optics. Especially the radially polarized beam, because it is focused by a high numerical aperture lens, the focused spot can break through the diffraction limit, and the longitudinal electric field component is very strong near the focus, the extremely small focused spot and the strong longitudinal electric field make the radially polarized beam It has important application value in ...

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Problems solved by technology

Secondly, the combined half-wave plate composed of 8 fan-shaped half-wave plates cannot generate high-order (greater than first-order) vector beams. If you want to increase the order of vector beams, you need to increase the number of half-wave plates, so there will be Make the loss in the central area larger, thereby reducing the purity of the light, so the above method is not suitable for generating high-order (greater than first-order) vector beams

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