Apparatus and method for generating square array vector beam with invariable space diffraction by using two-dimensional grating

Abstract

The disclosure proposes an apparatus and method for generating a square array vector beam with invariable space diffraction by using a two-dimensional grating. According to the apparatus, laser is processed by a beam expander collimating mirror to obtain a large-caliber parallel beam; the large-caliber parallel beam passes through a polarizer and then the polarized beam passes through a polarization beam splitting prism to obtain two large-caliber parallel beams in a vertical direction and a horizontal direction; the two large-caliber parallel beams in a vertical direction and a horizontal direction is reflected by a plane reflecting mirror and then the reflected beams enter two two-dimensional orthogonal gratings with the same parameters; and the two two-dimensional orthogonal gratings with the same parameters are arranged an optical branch at the right side and a lower optical branch, the relative positions of the two two-dimensional orthogonal gratings are adjusted and the optical fields of the two optical branches are superposed to generate a required periodic array square vector beam. Compared with the conventional filtering method, the provided apparatus and method has the following excellent characteristics: high energy utilization rate and invariable space diffraction and have the certain application space in fields like material processing and particle shunting.

Description

technical field [0001] The present disclosure relates to the field of optical technology, in particular to a device and method for generating space diffraction invariant square array vector light beams by using a two-dimensional grating. Background technique [0002] At present, a radial polarization converter or an angular spatial polarization converter can be used to generate a single vector beam. In addition, based on the principle similar to the molecular current ring, the radial polarization converter or the angular spatial polarization conversion can also be converted However, the energy efficiency of the periodically arranged vector beams produced by this method is very low, and with the change of the diffraction distance, the energy of the vector beams will be very low. Fast dispersion, the application value is worrying. [0003] In addition, a radial polarization converter or an angular spatial polarization converter with an aperture of one inch is expensive, and a...

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Problems solved by technology

[0002] At present, a radial polarization converter or an angular spatial polarization converter can be used to generate a single vector beam. In addition, based on the principle similar to the molecular current ring, the radial polarization converter or the angular spatial polarization conversion can also be converted However, the energy efficiency of the periodically arranged vector beams produced by this method is very low, and with the change of the diffraction distance, the energy of the vector beams will be very low. Fast dispersion, worrying about application value

[0003] In addition, a radial polarization converter or an angular spatial polarization converter with an aperture of one inch is expensive, and a radial polarization converter or an angular spatial polarization converter with a large aperture will be even more expensive. It means that the practical application value of the periodically arranged vector beams generated in this way is not great

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