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Device and method for moving self-focusing point of round Airy beam in large-range and high-precision manner

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 device and avoiding inaccuracy

Active Publication Date: 2020-06-12
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • 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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  • Device and method for moving self-focusing point of round Airy beam in large-range and high-precision manner
  • Device and method for moving self-focusing point of round Airy beam in large-range and high-precision manner
  • Device and method for moving self-focusing point of round Airy beam in large-range and high-precision manner

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Embodiment 1

[0035] Such as 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 plane mirror, and a third lens and charge couplers;

[0036] The laser outputs fundamental mode Gaussian light. After being polarized by the polarizer, the beam is expanded by the 4f system composed of the first lens and the second lens, so that when it enters the spatial light modulator, it fills up the liquid crystal screen. On the spatial light modulator Load the spectral information of the circular Airy beam, and control the two-dimensional plane of the self-focus point of the circular Airy beam by shifting the spectrum; after being modulated by the spatial light modulator and reflected by the plane mirror, it passes through the third lens Fourier After leaf transformation, a circular Airy beam is obtained at the fo...

Embodiment 2

[0041] Such as figure 1 , As shown in 2 and 3, the present invention also provides a method for moving the self-focus 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 the polarizer, and then expanded by plano-convex lenses placed parallel and vertically. The spatial light modulator (1920 × 1080 resolution) developed by Relike Information Co., Ltd. is used to load the expanded Gaussian beam on the expanded Gaussian beam, which contains the spectral information after the translation of the circular Airy beam and the kinoform of the blazed grating (such as figure 2 As shown in (b), after the Fourier transform of the lens, because of the addition of the blazed grating phase, it is necessary to use a diaphragm to filter out one level, and a circular Airy beam can be seen at its focal plane, and a ci...

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Abstract

The invention discloses a device and method for moving a self-focusing point of a round Airy beam in a large-range and high-precision manner. The method comprises the following steps of polarizing a Gaussian beam outputted by a laser by a polarizer, expanding the Gaussian beam by a 4f system formed by combining a first lens and a second lens, and enabling the Gaussian beam to irradiate to a spatial light modulator, loading the frequency spectrum information of the round Airy beam on the spatial light modulator, and operating and controlling a two-dimensional plane of the self-focusing point ofthe round Airy beam through frequency spectrum translation; after the modulation of the spatial light modulator, the reflection of a plane mirror and the Fourier transform of a third lens, obtainingthe round Airy beam on a focal plane, and observing a self-focusing point after two-dimensional displacement at a self-focusing position of the round Airy beam by using a charge coupler. By changingdifferent kinograms loaded by the spatial light modulator, the track of the generated round Airy beam can be finely, simply and conveniently adjusted, the purpose of changing the position of the self-focusing point is achieved, and the two-dimensional movement of the self-focusing point is large in regulation range and high in precision.

Description

technical field [0001] The invention relates to the technical field of light field control, in particular to a device and method for moving a self-focusing point of a circular Airy beam in a large range and in two dimensions with high precision. Background technique [0002] The circular Airy beam is a kind of sudden self-focusing beam, which was proposed by Nikolaos K.Efremidis in 2010 and produced a circular Airy beam, which will converge to the center by itself during the transmission process, and the light intensity at the focus of self-focusing It can reach up to hundreds of times of the initial spot light intensity. And within a very short distance from the self-focus position, the central light intensity can reach the maximum. Its field distribution is where Airy( ) is the Airy function, r is the radial length of the circular Airy beam, 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 a circular Airy beam. ...

Claims

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Application Information

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Patent Type & Authority Applications(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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