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A Random Fiber Laser with Raman Gain Variation along the Fiber Length

A fiber laser, fiber length technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of increasing fiber nonlinear coefficient, limited threshold reduction effect, harmful nonlinear effect, etc., to achieve distribution optimization, improve The effect of high output efficiency and lasing efficiency

Active Publication Date: 2018-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is to reduce the laser threshold by increasing the reflectivity of the semi-open-cavity mid-point mirror, or by increasing the nonlinear gain coefficient in the fiber to reduce the laser threshold, there are theoretical limits to these two technical routes
Specifically, (1) the reflectivity of the point mirror has an upper limit, which has a limited effect on reducing the threshold; (2) increasing the nonlinear coefficient of the fiber will aggravate the accumulation of nonlinear effects, resulting in harmful nonlinear effects
Thus severely restricting the development of random fiber lasers

Method used

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  • A Random Fiber Laser with Raman Gain Variation along the Fiber Length
  • A Random Fiber Laser with Raman Gain Variation along the Fiber Length
  • A Random Fiber Laser with Raman Gain Variation along the Fiber Length

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A random fiber laser whose Raman gain varies along the length of the fiber, comprising a sequentially connected pump light source 1, a point mirror 2 and an optical fiber 3, the Raman gain coefficient of the optical fiber 3 varies along the length of the optical fiber 3 .

Embodiment 2

[0044] A random fiber laser whose Raman gain varies along the length of the fiber, comprising a sequentially connected pump light source 1, a point mirror 2 and an optical fiber 3, the Raman gain coefficient of the optical fiber 3 varies along the length of the optical fiber 3 .

[0045] Wherein, the optical fiber 3 is a silica optical fiber 3 , and the core diameter of the silica optical fiber 3 varies along the length direction of the optical fiber 3 .

Embodiment 3

[0047] A random fiber laser whose Raman gain varies along the length of the fiber, comprising a sequentially connected pump light source 1, a point mirror 2 and an optical fiber 3, the Raman gain coefficient of the optical fiber 3 varies along the length of the optical fiber 3 .

[0048] Wherein, the optical fiber 3 is a silica optical fiber 3, and the core layer of the silica optical fiber 3 is doped with GeO 2 The concentration of fluorine and / or the concentration of fluorine doped in the cladding of the silica optical fiber 3 varies along the length direction of the optical fiber 3 .

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Abstract

The invention discloses a random fiber laser whose Raman gain varies along the fiber length, which belongs to the random fiber laser whose Raman gain varies along the fiber length in the technical field of fiber lasers. Without changing the cavity structure, cavity length, and average nonlinear coefficient, the thresholds of the first-order and second-order lasing can be effectively adjusted. The technical proposal is as follows: it includes sequentially connected pump light sources, point reflectors and optical fibers, and the Raman gain coefficient of the optical fibers changes along the length direction of the optical fibers. The invention is applicable to the random fiber laser whose Raman gain coefficient changes axially.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and relates to a fiber laser whose Raman gain changes along the direction of the fiber length. Background technique [0002] Random distribution feedback fiber laser has the advantages of compact structure, miniaturization, high conversion efficiency, and good beam quality of fiber laser, as well as the characteristics of random laser modeless and low spatial coherence, so it has received great attention. At the same time, it has been shown that random fiber lasers use randomly distributed Rayleigh scattering in the fiber as resonance feedback instead of the fixed resonator of traditional fiber lasers, and the laser gain is provided by stimulated Raman scattering in the fiber. Compared with traditional fiber lasers doped with rare earth ions, random distributed feedback fiber lasers have wider gain bandwidth and more output wavelength options, so they are considered as a new important light ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/30
CPCH01S3/06716H01S3/0672H01S3/06741H01S3/0675H01S3/302
Inventor 王子南范孟秋吴函饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA