Generation/three g dimensional reconstruction apparatus and method for Laguerre Gaussian vortex beam

Abstract

The invention discloses a generation/three-dimensional reconstruction apparatus and method for a Laguerre Gaussian vortex beam. The Laguerre Gaussian vortex beam generation apparatus comprises: a laser for emitting a Gaussian beam; a first convex lens for expanding the Gaussian beam; a second convex lens for collimating the expanded Gaussian beam; a computer for generating a fork-shaped diffraction grating and loading the fork-shaped diffraction grating onto a digital micromirror device, and subjecting the incident beam of the digital micromirror device to amplitude and/or phase modulation; and the digital micromirror device for subjecting a part of the collimated Gaussian beam to amplitude or/and phase modulation to produce Laguerre Gaussian vortex beams with different orders. The generation/three-dimensional reconstruction apparatus has a high damage threshold and a very fast response speed, is simple in structure, good in stability, and low in manufacturing cost, and is widely used in the fields of mechanical processing, biomedical treatment, military field, information transmission, micro-control and the like.

Description

technical field [0001] The invention relates to the technical field of optical measuring instruments, in particular to a Laguerre-Gaussian vortex beam generation / three-dimensional reconstruction device and method. Background technique [0002] In optics, a Laguerre-Gaussian beam is a light field satisfying: [0003] [0004] beam of light, of which Represents the Laguerre polynomial. By changing the values ​​of l and p, the shape of the Laguerre-Gaussian beam can be changed, so as to obtain Laguerre-Gaussian beams of different orders. [0005] Due to the vortex phase term carried in the Laguerre-Gaussian beam (LG beam), the center of the beam has a singularity, thereby forming a hollow symmetric mode in the center of the beam. This cylindrically symmetric mode can be described by the radial and angular factors p and l, and p and l remain constant during propagation. As a representative of vortex beams, Laguerre-Gauss beams have been widely used in many fields, and the...

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Problems solved by technology

[0007] In view of this, in order to solve the technical problem that the devices and methods for generating Laguerre-Gaussian beams in the prior art have the disadvantages of complex structure and poor stability, the present invention proposes a generation / three-dimensional reconstruction of Laguerre-Gaussian vortex beams The device and method select a digital micromirror device (DMD) to generate a vortex beam. During the experiment, the amplitude or phase of the LG beam can be loaded or the combination of the two can be used to generate the LG beam.

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