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A device and method for moving a circular Airy beam self-focusing point in a large range with high precision

A self-focusing, large-scale technology, applied in optics, optical components, nonlinear optics, etc., can solve the problem of inconvenient application of circular Airy beam optical tweezers, and achieve the effect of simple installation and avoidance of inaccuracy

Active Publication Date: 2022-05-31
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventors of the present invention found that the general circular Airy beam can only be transmitted according to the normal transmission track, or its transmission track can be changed mechanically, which is very inconvenient for the circular Airy beam in the application of optical tweezers
The method of manipulating the trajectory of the circular Airy beam through the spatial light modulator so that the self-focusing point of the circular Airy beam can be moved in a large range with high precision has not been proposed so far.

Method used

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  • A device and method for moving a circular Airy beam self-focusing point in a large range with high precision
  • A device and method for moving a circular Airy beam self-focusing point in a large range with high precision
  • A device and method for moving a circular Airy beam self-focusing point in a large range with high precision

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Embodiment 1

[0035] like figure 1 As shown, the present invention provides a device for moving the self-focusing point of a circular Airy beam with high precision in a large range, including a laser, a polarizer, a first lens, a second lens, a spatial light modulator, a flat mirror, and a third lens and charge couplers;

[0036] The laser outputs fundamental mode Gaussian light. After being polarized by the polarizer, the 4f system composed of the first lens and the second lens expands the beam, so that when it enters the spatial light modulator, it fills the liquid crystal screen. Load the spectral information of the circular Airy beam, and manipulate the two-dimensional plane of the self-focusing point of the circular Airy beam by shifting the spectrum; after modulation by the spatial light modulator and reflection by the plane mirror, the third lens Fourier After the leaf transformation, a circular Airy beam is obtained at the focal plane, and the two-dimensionally displaced self-focus...

Embodiment 2

[0041] like figure 1 , 2, 3, the present invention also provides a method for moving the self-focusing point of a circular Airy beam with high precision in a large range, including the following steps:

[0042] The fundamental mode Gaussian beam output by the laser (Verdi 12 solid-state laser, working wavelength 532nm) is polarized by a polarizer, and then expanded by a plano-convex lens placed in parallel and vertically. Through the spatial light modulator (1920×1080 resolution) developed by Relic Information Co., Ltd., the expanded Gaussian beam is loaded with the spectral information after the translation of the circular Airy beam and the kinoform of the blazed grating (such as figure 2 (b)), after the Fourier transform of the lens, due to the addition of the phase of the blazed grating, it is necessary to filter out the first stage with a diaphragm, and the circular Airy beam can be seen at its focal plane, and can be seen at the self-focusing plane. to the moved self-fo...

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Abstract

The invention discloses a device and method for moving the self-focusing point of a circular Airy beam with high precision in a large range. The method includes the following steps: the Gaussian beam output by the laser is polarized by a polarizer, and passes through a first lens and a second lens After the combined 4f system expands the beam, it is incident on the spatial light modulator, and the spectral information of the circular Airy beam is loaded on the spatial light modulator, and the two-dimensional plane of the self-focusing point of the circular Airy beam is achieved by shifting the spectrum control; after being modulated by a spatial light modulator, reflected by a plane mirror, and then Fourier transformed by a third lens, a circular Airy beam is obtained at the focal plane, and a two-dimensional displacement is observed with a charge coupler at its self-focus position The subsequent autofocus point. The invention can finely and conveniently adjust the trajectory of the generated circular Airy beam by changing the different kinoforms loaded on the spatial light modulator, so as to achieve the purpose of changing the position of the self-focus point, and the control range of the two-dimensional moving self-focus point is large High precision.

Description

technical field [0001] The invention relates to the technical field of light field regulation, in particular to a device and method for moving a self-focusing point of a circular Airy beam in two dimensions with high precision in a wide range. Background technique [0002] The circular Airy beam is a kind of sudden self-focusing beam. It was proposed by Nikolaos K.Efremidis in 2010 and produced the circular Airy beam. It will converge to the center by itself during the transmission process, and the light intensity is at the focus of the self-focusing. Up to hundreds of times of the initial spot light intensity. Moreover, the central light intensity can reach a maximum value within a short distance of the autofocus position. Its field distribution is where Airy( ) is the Airy function, r is the radial length of the circular Airy beam, and r 0 is the radius of the main ring, w 0 is the beam width of the beam, and α is the attenuation factor of the circular Airy beam. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09G02F1/01G02F1/13G02F1/133
CPCG02B27/0916G02B27/0955G02F1/0102G02F1/0121G02F1/13G02F1/133
Inventor 寿倩陈志超周卓弘
Owner SOUTH CHINA NORMAL UNIVERSITY
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