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Method for generating and measuring first-order circular Airy derivative light beam with sudden self-focusing effect and carrying vortex

A generation method and self-focusing technology, applied in photometry, optical radiation measurement, measuring devices, etc., can solve the problems of not being able to use optical manipulation, optical capture and optical guidance, and achieve the effect of expanding the scope of application

Pending Publication Date: 2022-07-29
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

However, the disadvantage of the first-order circular Airy derivative beam is that its intensity distribution in the focal plane is solid and cannot be used for optical manipulation, optical trapping, and optical guidance, etc.

Method used

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  • Method for generating and measuring first-order circular Airy derivative light beam with sudden self-focusing effect and carrying vortex
  • Method for generating and measuring first-order circular Airy derivative light beam with sudden self-focusing effect and carrying vortex
  • Method for generating and measuring first-order circular Airy derivative light beam with sudden self-focusing effect and carrying vortex

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Embodiment Construction

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] like figure 1 As shown, a linearly polarized Gaussian beam with a wavelength of λ of 532 nm is generated by a Nd:YAG laser Laser. The linearly polarized Gaussian beam is first expanded by a beam expander BE with a diameter of 2 cm, and then reflected by a mirror RM. is a 50:50 beam splitter BS, and the corresponding transmitted light enters a pure phase spatial light modulator SLM (model Holoeye GAEA) with a reflective pixel si...

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Abstract

The invention discloses a method for generating and measuring a first-order circular Airy derivative light beam with a sudden self-focusing effect and carrying a vortex. The method comprises the following steps: enabling a linear polarization Gaussian beam generated by a laser to pass through a beam expander, a reflector, a beam splitter, a specifically coded reflection type pure phase spatial light modulator, the beam splitter, a circular diaphragm and a Fourier lens in sequence; wherein the distance from the spatial light modulator to the Fourier lens and the distance from the Fourier lens to the Fourier plane / source plane are the focal length of the Fourier lens, and an expected first-order circular Airy derivative light beam carrying a vortex can be obtained on the Fourier plane / source plane; a light beam profile analyzer is mounted on the electric guide rail in the transmission direction of the generated light beam so as to measure intensity distribution and sudden self-focusing capability under different propagation distances; the generated first-order circular Airy derivative beam carrying one vortex has the advantages of hollow focus intensity distribution and carrying orbital angular momentum on the basis of retaining sudden self-focusing capability, and the application range is expanded compared with the first-order circular Airy derivative beam.

Description

technical field [0001] The invention relates to the generation and measurement method of a first-order circular Airy derivative beam with a sudden self-focusing effect and carrying a vortex. Circular diaphragm and Fourier lens to generate a first-order circular Airy derivative beam with abrupt self-focusing effect and carrying a vortex, with a moving beam profiler in the direction of propagation of the generated beam It was measured and proved to have a sudden self-focusing effect. Background technique [0002] During the theoretical study of the self-focusing properties of circular Airy beams in linear media, the researchers came up with the concept of sudden self-focusing. Sudden self-focusing means that the light beam maintains a low-intensity mode before the focus, but its intensity suddenly increases by dozens or even hundreds of times at the moment of reaching the focus. Subsequently, the above theoretical predictions were confirmed experimentally. Therefore, the re...

Claims

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Application Information

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IPC IPC(8): G02B27/10G02B27/09G01J1/00
CPCG02B27/1026G02B27/0916G02B27/0955G01J1/00
Inventor 周国泉臧翔周益民徐一清但汶松
Owner ZHEJIANG FORESTRY UNIVERSITY
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