Method and device using birefraction polarization beam splitter to generate vector beam

Abstract

A method and a device using a birefraction polarization beam splitter to generate a vector beam are provided; the device is that a computed hologram is arranged on a front focal plane of a first fourier lens; the birefraction polarization beam splitter is arranged between the front focal plane of the first fourier lens and the first fourier lens; a filter bore diameter is arranged on a rear focal plane of the first fourier lens, and a second fourier lens is arranged between the filter bore diameter and an output plane. The method is to use a plane beam or a gauss beam to irradiate the computed hologram, the beam passing the computed hologram is converted by the birefraction polarization beam splitter and the first fourier lens, and is filtered by the filter bore diameter; the beam passing the filter bore diameter passes the second fourier lens, and the needed vector beam can be obtained on the output plane. No element is needed between the computed hologram and the birefraction polarization beam splitter, extinction ratio of two cross-polarized components of the generated vector beam is better than 10-5, thus obtaining the high quality vector beam.

Description

technical field [0001] The invention relates to a method and a device for generating a vector beam based on a birefringent polarization beam splitter, and belongs to the technical field of vector beams. Background technique [0002] In recent years, more and more studies have begun to involve vector beams with non-uniform distribution of polarization states, because it has been found that such vector beams have some special properties that scalar light fields with uniform polarization do not have (see references 1-4). The special properties of vector beams have been used in super-resolution focused imaging (see literature 5 and 6), surface plasmon excitation (see literature 7 and 8), optical micromanipulation (see literature 9-12), laser micromachining (see literature 13 and 14) and other fields have shown its important practical application value. [0003] Since most commercial lasers can only output simple modes, how to transform them into vector beams with both specific ...

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Problems solved by technology

[0004] Recently, literature 32 and literature 33 proposed two methods and devices for generating arbitrary vector beams based on Wollaston prisms, but the method in literature 33 can only be used to generate some special vector beams, such as polarization vortices; while the literature 32 The method needs to insert a non-polarizing beam splitter in the optical path, so that the energy utilization rate is greatly reduced

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