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Few-mode fiber-based high-order mode Brillouin optical fiber laser

A fiber laser, few-mode fiber technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of beam power and quality degradation, low purity of output high-order mode modes, etc., to achieve easy popularization and use and improve practicability and good reliability and stability

Active Publication Date: 2018-08-10
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

In addition, due to the imperfection of the device, these two layouts will also lead to degradation of beam power and quality, and the output high-order modes have low purity

Method used

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  • Few-mode fiber-based high-order mode Brillouin optical fiber laser

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Embodiment 1

[0023] like figure 1 As shown, a high-order mode Brillouin fiber laser based on a few-mode fiber in this example includes a narrow linewidth pump laser 1, an optical amplifier 2, a first fiber mode selective coupler 3, a first polarization controller 4, and an optical fiber A circulator 5 , a second fiber mode selective coupler 6 , a second polarization controller 7 and a few-mode fiber 8 .

[0024] The laser light output by the narrow-linewidth pump laser 1 is amplified by the amplifier 2, and the amplified high-power pump light is injected into the first port 301 of the first optical fiber mode selective coupler 3, and after passing through the first optical fiber mode selective coupler 3 , the pump light is converted from the fundamental transverse mode of the single-mode fiber in the first port 301 to the specific high-order mode of the few-mode fiber in the second port 302 of the first fiber mode selective coupler 3, and the generated high-order mode pump light is injecte...

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Abstract

The invention discloses a few-mode fiber-based high-order mode Brillouin optical fiber laser. The laser is of an annular cavity structure and comprises a narrow-line wide pump laser, an optical amplifier, a first optical fiber mode selection coupler, a first polarization controller, an optical fiber circulator, a second optical fiber mode selection coupler, a second polarization controller and a few-mode fiber. The first optical fiber mode selection coupler is an extra-cavity mode conversion device, and can realize the directional selection coupling of a fundamental transverse mode in a single-mode fiber and a specific high-order mode in a few-mode fiber. The second optical fiber mode selection coupler is an intra-cavity mode coupling device, and can realize the directional selection coupling of a high-order mode in a few-mode fiber and a high-order mode in a few-mode fiber. Based on the Brillouin nonlinear gain of the few-mode fiber in the annular cavity, the resonance amplification of the high-order mode in the cavity is achieved. The high-order mode laser is directly outputted.

Description

technical field [0001] The invention relates to the technical fields of fiber lasers and optical communications, in particular to a high-order mode Brillouin fiber laser based on few-mode fibers. Background technique [0002] Due to their unique spatial intensity, phase, and polarization distributions, higher-order mode lasing has promising applications and attracted increasing interest. For example, in the field of optical communication, information is modulated on several different high-order modes, that is, mode division multiplexing technology, which can significantly improve the transmission capacity in optical communication. In the field of optical fiber sensing, higher order modes can achieve higher temperature and strain resolution accuracy. In addition, vortex lasers derived from higher-order modes have great potential in quantum and nano-optics, optical manipulation, super-resolution imaging, and laser material processing. [0003] Motivated by these applications...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/30
CPCH01S3/06708H01S3/06766H01S3/302Y02A90/10
Inventor 甘久林衡小波杨中民张智深
Owner SOUTH CHINA UNIV OF TECH
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