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Optical system for generating hollow beam by focusing Bessel-Shell model light field through axicons

A hollow beam and optical system technology, applied in the field of optics, can solve the problems of stability, high price, and limitation of the accuracy of the optical system

Active Publication Date: 2016-07-27
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many ways to generate hollow beams, such as photon sieve method, multimode fiber method, spiral phase plate method, Airy beam array, etc., but these methods are often limited by the stability of the optical system precision or expensive reasons, making There are many limitations in practical application

Method used

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  • Optical system for generating hollow beam by focusing Bessel-Shell model light field through axicons
  • Optical system for generating hollow beam by focusing Bessel-Shell model light field through axicons
  • Optical system for generating hollow beam by focusing Bessel-Shell model light field through axicons

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Embodiment Construction

[0013] In order to further explain the technical solution of the system of the present invention, the system of the present invention will be described in detail below through specific examples.

[0014] The present invention uses an axicon to focus the Bessel-Scher model light field to produce the optical system of the hollow beam, such as figure 1 As shown, an optical bench 1 is included, and a He-Ne laser 2 is arranged on the optical bench 1. A short focal length lens 3, a long focal length lens 4, an aperture stop 5, and a first axicon are placed in sequence along the laser light path of the He-Ne laser 2. 6. The first thin lens 7 , the ground glass of rotation 8 , the second thin lens 9 and the second axicon 10 . A CCD imaging system 11 is arranged behind the second axicon 10 .

[0015] Laser 2, short focal length lens 3, long focal length lens 4, aperture stop 5, first axicon 6, first thin lens 7, rotating frosted glass 8, second thin lens 9, second axicon 10 and CCD im...

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Abstract

The invention discloses an optical system for generating a hollow beam by focusing a Bessel-Shell model light field through axicons.The optical system comprises an optical platform.A laser device is placed on the optical platform.A collimation and beam expanding system, an aperture diaphragm, the first axicon, a first thin lens, rotary ground glass, a second thin lens and the second axicon are sequentially placed along an optical path of the laser device.By means of the technology, the hollow beam of the size increasing along with increase of the distance can be generated, and the hollow beam has a self-reconstruction characteristic.The optical system has the advantages that the optical structure is simple, optical elements are cheap, and the generated hollow beam is high in quality; a powerful means will be provided for people to trap particles of different sizes and numbers on multiple layers.

Description

technical field [0001] The invention relates to the field of optics, in particular to an optical system that uses an axicon to focus a Bessel-Scher model light field to generate a hollow beam. Background technique [0002] A hollow beam is a special beam whose central light intensity is zero in the direction of propagation. This special beam has the advantages of a minimum light intensity at the center and high-intensity light around it, which makes it have important applications in optical tweezers, particle trapping, and atom cooling. At present, hollow beams have been widely used in the capture and manipulation of various particles. The capture environment expands from liquid to gas, and the manipulated particles extend from small inorganic molecules to living cells. Therefore, the generation and application of hollow beams have always been a hot topic of research. [0003] At present, there are many ways to generate hollow beams, such as photon sieve method, multimode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09
CPCG02B27/095G02B27/0955G02B27/0972
Inventor 吴逢铁朱清智冯聪明何西
Owner HUAQIAO UNIVERSITY
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