Optical system capable of generating banding diffraction-free light beams

A non-diffraction beam and optical system technology, applied in the field of optical systems, can solve problems such as high cost and complicated operation

Inactive Publication Date: 2014-12-10
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, to generate a strip-shaped non-diffracting beam with the characteristics of Mathieu beam, it is usually...

Method used

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  • Optical system capable of generating banding diffraction-free light beams
  • Optical system capable of generating banding diffraction-free light beams
  • Optical system capable of generating banding diffraction-free light beams

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Embodiment Construction

[0014] 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.

[0015] A kind of optical system of the present invention produces strip-shaped non-diffraction beam, such as figure 1 As shown, there is an optical platform 1, on which a laser 2 is placed, and along the laser light path of the laser 2, a short focal length lens 3, a long focal length lens 4, an elliptical aperture film 5 and an axicon 6 are sequentially placed. Wherein, the laser 2 , the short focal length lens 3 , the long focal length lens 4 , the elliptical aperture film 5 and the axicon 6 are respectively supported and positioned on the optical table 1 by the fixed bracket 7 .

[0016] Wherein, the focal point of short focal length lens 3 coincides with the focal point of long focal length lens 4;

[0017] Wherein, laser 2 adopts He-Ne laser.

[0018] The focal point of the sh...

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Abstract

The invention discloses an optical system capable of generating banding diffraction-free light beams. The optical system comprises an optical platform. A laser is disposed on the optical platform, and a short-focal-length lens, a long-focal-length lens, an elliptical-aperture film and an axicon are sequentially arranged along a laser path of the laser. The focus of the short-focal-length lens is superposed with the focus of the long-focal-length lens; the elliptical-aperture film is close to the axicon; the diameter of a light beam irradiating the elliptical-aperture film from the long-focal-length lens is larger than that of a short axis of an elliptical hole of the elliptical-aperture film. The optical system is capable of conveniently generating the banding diffraction-free light beams and provides a new way for generating the banding diffraction-free light beams in low-cost, simple and effective manner. During actual use, the optical system has a special significance in improving optical nondestructive detecting and detecting efficiency in bar code scanning.

Description

technical field [0001] The invention relates to an optical system for focusing a circular Gaussian beam to generate a strip-shaped non-diffraction beam. Background technique [0002] A non-diffracting beam is a beam whose transverse light field distribution does not change with the propagation distance during free space propagation and whose light field energy is concentrated. Because of the characteristic that the intensity and spot size remain unchanged during the propagation process, it is widely used in laser drilling, optical capture and manipulation, laser imaging, interferometry, and space optical communication. The simpler way to generate a non-diffraction beam in the experiment is to use a plane wave directly incident on the axicon to obtain a non-diffraction beam. When the amplitude of the plane wave incident on the axicon is a plane wave with a uniform distribution, a non-diffraction Bessel beam is generated. When incident on the axicon When the amplitude distrib...

Claims

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Application Information

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IPC IPC(8): G02B27/09
Inventor 吴逢铁谢晓霞李冬
Owner HUAQIAO UNIVERSITY
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