Hollow beam generation device

Abstract

The invention provides a hollow beam generation device, which comprises a spatial light modulator, a beam splitter, a mirror and a conversion system, wherein the spatial light modulator, the mirror and the conversion system are arranged at different side parts of the beam splitter; the distance between the spatial light modulator and the beam splitter is the same as that between the mirror and the beam splitter; the spatial light modulator is used for receiving a first beam emitted by the beam splitter and reflecting a second beam to the beam splitter, and a pi phase difference exists between the first beam and the second beam; the conversion system is used for receiving a third beam emitted by the beam splitter and outputting a hollow beam, and the third beam is the beam formed when the second beam is overlapped with a fourth beam reflected by the mirror, and a pi phase difference exists between the second beam and the fourth beam. The beam splitter is used for realizing laser beam coupling, the laser beams are directly modulated to generate the hollow beam, and the device is simple and easy to operate.

Description

Technical field [0001] The present invention relates to the field of optical technology, in particular to a hollow beam generating device. Background technique [0002] A hollow beam is a beam whose central or axial intensity in the propagation direction is zero, and there is a phase singularity point at the center of this type of beam. Because hollow beams are widely used in life sciences and nanotechnology, binary optics, atomic optics, and laser control and guidance of microscopic particles, they have attracted attention. [0003] In recent years, the generation of hollow beams and the types of hollow beams have aroused the close attention of many scholars at home and abroad, and have become important research topics. People use a variety of methods to obtain a variety of hollow beams, including: mode conversion method, geometric optics method, optical holography method, computer holography method, transverse mode selection method, phase plate method, spatial light modulator me...

AI Technical Summary

Problems solved by technology

[0004] The shape of the hollow beam diffracted by the elliptical annular aperture 15 is single, and there is a large amount of energy loss, which is not conducive to the practical application of the hollow beam

Most of the other ways to obtain a hollow beam require mode conversion of the laser beam, the experimental device is complex, and the requirements for the components of each link in the experimental device are relatively high, and the operation is relatively complicated

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