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An all-fiber vortex laser based on orbital angular momentum mode resonance

An orbital angular momentum and laser technology, which is used in lasers, laser parts, phonon exciters, etc., can solve the problems of inability to support stable transmission of orbital angular momentum modes, poor stability of vortex beams, and low mode purity. The effect of practicality and reliability, low cost, high pattern purity

Pending Publication Date: 2018-12-21
SOUTH CHINA UNIV OF TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Since the mode generated by the fiber coupler is a degenerate linearly polarized (LP) mode, additional stress and adjustment of the polarization state are still required to generate the vortex beam, so the vortex beam generated by the all-fiber laser is completely limited The single-mode fiber-few-mode fiber coupler used has poor beam quality and low mode purity
In addition, the few-mode fiber used in this invention cannot support the stable transmission of the orbital angular momentum mode, resulting in poor stability of the generated vortex beam

Method used

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  • An all-fiber vortex laser based on orbital angular momentum mode resonance
  • An all-fiber vortex laser based on orbital angular momentum mode resonance
  • An all-fiber vortex laser based on orbital angular momentum mode resonance

Examples

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Embodiment 1

[0027] Such as figure 1 As shown, an all-fiber vortex optical laser based on orbital angular momentum mode resonance in this example includes a narrow linewidth pump laser 1, an optical amplifier 2, an orbital angular momentum mode generator 3, a first polarization controller 4, and an optical fiber Circulator 5 , fiber coupler 6 , second polarization controller 7 and vortex fiber 8 .

[0028] In this embodiment, the narrow-linewidth pump laser 1 is a narrow-linewidth semiconductor laser or a narrow-linewidth fiber laser with tunable C-band power, the linewidth is lower than 1 MHz, and the pigtail is a single-mode fiber.

[0029] The optical amplifier 2 is a high-gain erbium-doped optical fiber amplifier or a 1550nm band semiconductor optical amplifier, and the pigtail is a single-mode optical fiber.

[0030] The orbital angular momentum mode generator 3 is a 2×2 mode selective coupler made by fusion tapering of single-mode fiber and vortex fiber, which can realize the funda...

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Abstract

The invention discloses an all-fiber scroll optical laser based on the orbital angular momentum mode resonance, which has a ring cavity structure, and comprises a narrow linewidth pump laser, an optical amplifier, an orbital angular momentum mode generator, a first polarization controller, an optical fiber ring, an optical fiber coupler, a second polarization controller and a scroll optical fiber.The orbital angular momentum mode generator converts the fundamental transverse mode of a single-mode optical fiber into the orbital angular momentum mode of a specific topological charge in a vortexoptical fiber. The fiber coupler can realize the directional coupling of the orbital angular momentum mode in one scroll fiber to the orbital angular momentum mode in another scroll fiber. Vortex optical fiber is a kind of optical fiber which supports orbital angular momentum mode stable transmission. Based on Brillouin nonlinear gain of vortex fiber in ring cavity, the resonant amplification oforbital angular momentum mode in cavity is realized and vortex laser is output. The invention adopts an all-optical fiber structure, has good output vortex laser stability, narrow line width and highorbital angular momentum mode purity.

Description

technical field [0001] The invention relates to the technical fields of fiber lasers and optical communications, in particular to an all-fiber vortex optical laser based on orbital angular momentum mode resonance. Background technique [0002] The vortex beam is a ring-shaped hollow beam with a spiral phase distribution and zero central intensity, and its light field distribution contains a phase factor exp(ilφ) , each photon in the beam carries l The orbital angular momentum of l are called topological charges. different topological charges l The orbital angular momentum mode is orthogonal, which is a new dimension besides the four dimensions of frequency, amplitude, phase and polarization state of the traditional plane wave. Therefore, the use of vortex beams in the field of optical communication will greatly improve the communication System capacity and spectral efficiency. In addition, due to the unique spatial intensity and phase distribution of vortex beams, they ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067
CPCH01S3/06712H01S3/06716H01S3/06783H01S3/06791H01S2301/203H01S3/302H01S3/094042H01S3/094038H01S3/10023H01S3/06754G02B6/29379G02B6/29346
Inventor 甘久林杨中民衡小波张智深
Owner SOUTH CHINA UNIV OF TECH
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