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Single-longitudinal-mode Brillouin fiber laser with orbital angular momentum mode direct resonance

A technology of orbital angular momentum and fiber lasers, applied in the laser field, can solve problems such as the inability to meet the stable transmission of orbital angular momentum mode and unstable single-frequency laser transmission, and achieve the effects of low loss, simple structure and high purity

Inactive Publication Date: 2019-12-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional single-mode fiber only supports the transmission of the fundamental transverse mode. Due to the weak waveguide approximation in the traditional few-mode fiber or multimode fiber, the high-order vector transverse modes with similar propagation constants are degenerated into linear polarization modes, which cannot meet the requirements of the orbital angular momentum mode. Stable transmission in optical fiber
Therefore, the orbital angular momentum mode single-frequency laser transmission converted from the output end of the traditional single-frequency fiber laser is unstable

Method used

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  • Single-longitudinal-mode Brillouin fiber laser with orbital angular momentum mode direct resonance
  • Single-longitudinal-mode Brillouin fiber laser with orbital angular momentum mode direct resonance
  • Single-longitudinal-mode Brillouin fiber laser with orbital angular momentum mode direct resonance

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Embodiment 1

[0029] Such as figure 1Shown is the schematic diagram of the single longitudinal mode Brillouin fiber laser of direct resonance of orbital angular momentum mode proposed by the present invention, including fundamental mode pumping source 1, optical amplifier 2, first polarization controller 3, orbital angular momentum mode generator 4. A second polarization controller 5 , a first fiber circulator 6 , a first fiber coupler 7 , a third polarization controller 8 , a frequency selector 9 and a vortex fiber 10 . Wherein, the orbital angular momentum mode generator 4 has a first port 401 and a second port 402; the first fiber circulator 6 has a first port 601, a second port 602 and a third port 603; the first fiber coupler 7 has a first port A port 701, a second port 702 and a third port 703; the fundamental mode pump source 1 is connected to the optical amplifier 2 through a single-mode fiber, and the optical amplifier 2 is connected to the first port of the orbital angular moment...

Embodiment 2

[0034] Such as image 3 Shown is a schematic diagram of a frequency-selected single longitudinal mode Brillouin fiber laser using the combination technology of a Sagnac ring and a saturable absorber in this embodiment. The structure of this embodiment 2 is basically similar to that of embodiment 1, the difference is that the frequency selector 9 in this embodiment 2 is specifically composed of a second optical fiber circulator 13, a third optical fiber coupler 14 and an erbium-doped vortex optical fiber 15; The second optical fiber circulator 13 has a first port 1301, a second port 1302 and a third port 1303; the third optical fiber coupler 14 has a first port 1401, a second port 1402 and a third port 1403; the second optical fiber circulator 13 The first port 1301 of the second fiber optic circulator 13 is connected to the third port 603 of the first fiber optic circulator 6 through the vortex fiber, and the second port 1302 of the second fiber optic circulator 13 is connecte...

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Abstract

The invention discloses a single-longitudinal-mode Brillouin fiber laser with orbital angular momentum mode direct resonance. The laser comprises a fundamental mode pumping source, an optical amplifier, a first polarization controller, an orbital angular momentum mode generator, a second polarization controller, a first optical fiber circulator, a first optical fiber coupler, a third polarizationcontroller, a frequency selector and a vortex optical fiber. Based on the mode separation and optimization design of a vortex optical fiber, the generation and stable transmission of a specific-orderorbital angular momentum mode in the resonant cavity and at the output end can be ensured by adopting a vortex optical fiber device. Based on a same-order mode pumping mechanism and a resonant cavitymode filtering effect, the in-cavity same-order orbital angular momentum mode Brillouin signal light directly resonates. Only one longitudinal mode in the cavity starts oscillation through the frequency selector and the control cavity length, and single longitudinal mode laser output is guaranteed. Based on a single-mode direct resonance mechanism in the annular cavity, the output single-longitudinal-mode orbital angular momentum mode laser has the advantages of high mode purity, good light beam quality and the like.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a single longitudinal mode Brillouin fiber laser with orbital angular momentum mode direct resonance. Background technique [0002] A vortex beam is a field distribution with a helical phase term exp(ilφ) A beam of light in which each photon carries lh Orbital angular momentum ( l is the topological charge, φ is the azimuth angle, h is Planck's constant), and has the characteristics of annular light field distribution and spiral phase singularity. These unique properties make it widely used in the fields of material processing, optical tweezers, high-resolution imaging, fiber optic sensing, and fiber optic communication. However, these application prospects put forward higher requirements on the monochromaticity, coherence, mode purity and stability of the vortex beam. Single-frequency fiber lasers can meet such requirements due to their advantages such as narrow linewidth,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/30H01S3/067
CPCH01S3/06791H01S3/302
Inventor 甘久林衡小波杨中民张智深林巍
Owner SOUTH CHINA UNIV OF TECH
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