Method for producing partially coherent Airy beams

Abstract

The invention relates to a beam transmission and conversion technology, and discloses a method for producing partially coherent Airy beams. The method comprises the following steps that: a laser device emits a fully coherent gauss beam, and a convex lens and a rotary frosted glass sheet regulate the coherence of the gauss beam to get a partially coherent gauss beam; and after being collimated by a second convex lens, the partially coherent gauss beam is subjected to beam intensity distribution shaping by a gauss amplitude filter, a spatial light modulator to which a phase information graph is loaded modulates the phase of the partially coherent gauss beam, and a first-stage diffracted beam is captured through a circular aperture diaphragm, thus obtaining the partially coherent Airy beam. The method produces the partially coherent Airy beam by directly using the gauss beam, and is scientific in principle and easy to realize; and the device for implementing the method is simple in structure, easy to regulate, excellent in stability and low in production cost. The beam provided by the method can be practically used in the fields of optical particle cleaning, biomedical therapy, particulate trapping, electron acceleration, and the like.

Description

technical field [0001] The invention relates to beam transmission and conversion technology, in particular to a method and device for generating partially coherent Airy beams, which are applied to fields such as biomedical treatment, optical tweezers, generation of curved plasma channels, and electron acceleration. Background technique [0002] A light wave with a limited size in space, because it carries propagation components at various angles, its energy always tends to diverge when propagating linearly in a vacuum or a homogeneous medium, which is called beam diffraction. This phenomenon is more pronounced for smaller beams traveling the same distance. Recently, the research of micro-nanophotonics is in full swing, and the diffraction of light beams on this scale is more inevitable. Therefore, it is of great application value to control the beam without diffraction. [0003] In 1987, J. Durnin, an optical expert at the University of Rochester in the United States, firs...

AI Technical Summary

Problems solved by technology

This method can use the multimode laser resonator to oscillate through intracavity modulation to directly output the required beam model, but at this stage, it is relatively difficult to artificially control the oscillation of each mode of the multimode resonator and adjust the weight of each mode energy. Difficult, especially to adjust the properties of individual modes in real time, and expensive to produce

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