Vortex light single-frequency optical fiber laser

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

Active Publication Date: 2019-11-19
SOUTH CHINA UNIV OF TECH
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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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  • Vortex light single-frequency optical fiber laser

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Embodiment 1

[0027] Such as figure 1 Shown is the all-fiber vortex optical mode-locked ring cavity laser of this embodiment, including a fundamental mode pump source 1, a polarization controller 2, an orbital angular momentum mode generator 3, a wavelength division multiplexer 4, and a gain vortex fiber 5 , Fiber isolator 6, frequency selector 7, fiber coupler 8 and vortex fiber 9. Wherein, the orbital angular momentum mode generator 3 has a first port 301 and a second port 302; the wavelength division multiplexer 4 has a first port 401, a second port 402 and a third port 403; the fiber coupler 8 has a first port 801, the second port 802 and the third port 803; the fundamental mode pump source 1 is connected to the first port 301 of the orbital angular momentum mode generator 3 through a single-mode optical fiber, and the polarization controller 2 is applied on the single-mode optical fiber, and the orbital angle The second port 302 of the momentum mode generator 3 is connected to the fi...

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Abstract

The invention discloses a vortex light single-frequency optical fiber laser. The laser comprises a fundamental mode pumping source, a polarization controller, an orbital angular momentum mode generator, a wavelength division multiplexer, a vortex gain optical fiber annularly doped with gain ions, an optical fiber isolator, a frequency selector, an optical fiber coupler and a vortex optical fiber.Based on mode separation and optimization design of the vortex optical fiber, generation and stable transmission of a specific-order orbital angular momentum mode in the resonant cavity and at the output end can be ensured by adopting the vortex optical fiber device. Based on the same-order mode pumping mechanism and the resonant cavity mode filtering effect, the gain of signal light in an intra-cavity same-order orbital angular momentum mode is maximized so that vortex light laser is obtained. Only one longitudinal mode in the cavity starts oscillation through the frequency selector and the control cavity length, and vortex light single-frequency laser output is guaranteed. Based on a single-mode direct resonance mechanism in the annular cavity, the output vortex light single-frequency laser has the advantages of the high mode purity, the good light beam quality and the like.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a vortex light single-frequency fiber laser. 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, high monochromaticity and coherence. At the same time, ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01S3/067H01S3/094G02B6/255
CPCG02B6/2552H01S3/06708H01S3/06712H01S3/06716H01S3/0675H01S3/06791H01S3/094003
Inventor甘久林衡小波杨中民张智深林巍
OwnerSOUTH CHINA UNIV OF TECH