A Method of Phase Modulating Airy Beam Trajectory Based on Parabolic Lens

Abstract

The invention provides a method for phase modulation of an Airy beam transmission trajectory based on a parabolic lens, comprising the following steps: step 1, a laser emits a Gaussian beam, and collimates and expands the Gaussian beam; Step 2, The collimated and expanded Gaussian beam is projected onto the beam splitter for splitting; step 3, inject the split beam into the spatial light modulator with the phase pattern loaded in advance, and perform phase modulation; finally, the cubic phase mask The light beam behind the membrane plate is Fourier transformed by a Fourier transform lens to obtain an Airy beam. The invention uses a computational holographic technique to obtain a phase mask of the phase factor of the parabolic lens. By changing the modulation parameters of the phase factor of the quasi-parabolic lens, the phase mask with the corresponding modulation effect is obtained, so as to realize the flexible control of the transmission trajectory of the Airy beam.

Description

technical field [0001] The invention relates to a method for regulating and controlling the transmission track of an Airy beam, and discloses a method for modulating the transmission track of an Airy beam based on the phase of a quasi-parabolic lens. Background technique [0002] In 2007, Siviloglou found that adding an exponential decay function to the Airy function can still satisfy the wave equation, and for the first time produced an Airy beam with finite energy experimentally. As a kind of non-diffracting light, Airy light has attracted great attention due to its unique properties such as approximately non-diffraction, transverse self-acceleration, and self-healing properties. The transmission trajectory of the Airy beam is parabolic rather than the conventional straight line. Since there are different requirements for the transmission trajectory of the Airy beam in different situations, the regulation of the transmission trajectory of the Airy beam has gradually becom...

AI Technical Summary

Problems solved by technology

This method is simple and effective, but due to the limited size of the spatial light modulator, the offset introduced is small, which greatly limits the control range of the Airy beam transmission trajectory

[0004] In 2014, Wu Jiangmiao et al. gave the self-acceleration of the Airy beam with reference to the definition of mechanical acceleration, and found that the magnitude of the acceleration is inversely proportional to the cube of the focal length of the lens, that is to say, controlling the focal length of the Fourier transform lens can control the Airy beam The degree of self-bending, but due to the limited space range during the experiment, the focal length of the lens is limited, and it is impossible to flexibly use lenses with different focal lengths for modulation

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