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Method of generating hollow hight beam and tuning by utilizing optical fiber intermodal interference

A technology of hollow beam and intermode interference, which is applied in the field of optics and optical fiber, can solve problems such as complex methods, and achieve the effect of compact structure

Inactive Publication Date: 2008-02-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods for generating hollow beams are generally more complicated, and some methods can only generate approximate or localized hollow beams

Method used

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  • Method of generating hollow hight beam and tuning by utilizing optical fiber intermodal interference
  • Method of generating hollow hight beam and tuning by utilizing optical fiber intermodal interference
  • Method of generating hollow hight beam and tuning by utilizing optical fiber intermodal interference

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Embodiment Construction

[0024] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. As shown in Figure 1, the diameter of the core (102) of the single-mode fiber used is 4 μm, the diameter of the cladding (101) is 125 μm, and its numerical aperture is 0.13 for a wavelength of 630 nm. The diameter of the core (104) of the multimode optical fiber is 9 μm, the diameter of the cladding (103) is 125 μm, and its numerical aperture is 0.14 for a wavelength of 1310 nm. A length of 65 mm of the above-mentioned multimode optical fiber and the above-mentioned single-mode optical fiber were fused together using an optical fiber fusion splicer. A single-mode semiconductor laser with a wavelength of 635nm output by a pigtail is used as the light source. A single-mode optical fiber connector is used to connect the single-mode optical fiber to the pigtail output from the semiconductor laser. The temperature control element (10...

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Abstract

The invention discloses a method of using optical fiber intermode interference to generate hollow light beam and tune. The process includes the following steps: adopts optical fiber and taking unbiased connection, and the diameter of multimode optical fiber is 5-50um, the light energy is gathered ON LPO1 and LPO2, selecting the length of multimode optical fiber to satisfy interference condition. The output end and the compounding light beam is hollow light beam. The tuning process includes the following steps: using temperature component to alter circumstance temperature or impressing axial stress to the multimode optical fiber. The invention is simple structure and is easy to tune.

Description

technical field [0001] The invention relates to a method for generating hollow beams and tuning, in particular to a method for generating hollow beams and tuning by interfering between optical fiber modes, which belongs to the field of optics and optical fiber technology. Background technique [0002] The so-called hollow beam refers to an annular beam whose central light intensity is low or zero in the propagation direction of the beam. The general laser beam has the maximum light intensity at the center and gradually weakens along the radial direction, which can be described by a Gaussian model in most cases. Hollow beams have physical properties that Gaussian beams do not have, such as small dark spot size, transmission invariance, and some hollow beams also have spin and orbital angular momentum. Due to the characteristics of the hollow beam, it has important application prospects in the fields of modern physics, biomedicine, optical communication and optical sensing. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/00
Inventor 李恩邦
Owner TIANJIN UNIV