A single-frequency fiber laser with a short linear cavity orbital angular momentum mode
A technology of orbital angular momentum and fiber lasers, which is applied in the laser field, can solve the problems of unable to meet the stable transmission of orbital angular momentum mode and unstable single-frequency laser transmission, and achieve the effect of low cost, high conversion efficiency and high mode purity
Active Publication Date: 2021-07-20
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
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Embodiment 1
[0026] like figure 1 Shown is the single-frequency optical fiber laser with a short linear cavity orbital angular momentum mode in 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 narrowband fiber grating 5. High gain vortex fiber 6, broadband fiber grating 7, fiber isolator 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 mode fiber is connected to the first port 301 of the orbital angular momentum mode generator 3, the polarization controller 2 is applied on the single-mode fiber, and the second port 302 of the orbital angular momentum mode generator 3 is connected to the first port of the wavelength division multiplexer 4 One port 401, the second port 402 of the wavelengt...
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The invention discloses a single-frequency optical fiber laser with a short linear cavity orbital angular momentum mode based on direct resonance to achieve high mode purity. The laser includes a fundamental mode pump source, a polarization controller, an orbital angular momentum mode generator, a wavelength division devices, narrowband fiber gratings, high-gain vortex fibers doped with gain ion rings, broadband fiber gratings, fiber isolators, and vortex fibers. The invention is based on the mode separation and optimization design of the vortex optical fiber, and adopts the vortex optical fiber device to ensure the generation and stable transmission of the specific order orbital angular momentum mode in the resonant cavity and the output end. Based on the same-order mode pumping mechanism and the filtering effect of the resonant cavity, the orbital angular momentum mode laser output is obtained on the basis of the short-line cavity resonance. The invention is based on a single-mode direct resonance mechanism in a linear cavity, and the output orbital angular momentum mode single-frequency laser has the advantages of high mode purity and good beam quality.
Description
technical field [0001] The invention relates to the field of laser technology, in particular to a short-line cavity orbital angular momentum mode 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...
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IPC IPC(8): H01S3/067H01S3/094H01S3/0941
CPCH01S3/06716H01S3/0675H01S3/094076H01S3/0941
Inventor 甘久林衡小波杨中民张智深林巍
Owner SOUTH CHINA UNIV OF TECH