Longitudinal spiral mode transfer optical fiber

A mode transfer, optical fiber technology, applied in clad optical fibers, multi-layer core/clad optical fibers, optics, etc., can solve the problems of beam quality deterioration, reduce core power density, etc., to improve the output beam quality, output beam Quality improvement, the effect of realizing optical fiber single-mode transmission

Inactive Publication Date: 2015-04-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a longitudinal helical transfer optical fiber, the purpose of which is to filter out the high-order modes in the fiber core of the large mode field area and realize the stable fundamental mode of the large mode field area fiber Output, to solve the technical problem in the prior art that the use of a large mode field area fiber reduces the core power density and leads to the deterioration of the beam quality

Method used

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  • Longitudinal spiral mode transfer optical fiber

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Embodiment 1

[0042] The longitudinal helical mode transfer optical fiber of embodiment 1 is a double-clad longitudinal helical mode transfer silica fiber, comprising a core 101, a cladding 102 surrounding the core, an outer cladding 103 and a coating 104; the schematic view of its end face is as follows image 3 As shown, three side cores 301 are uniformly arranged in the cladding 102 and spirally distributed longitudinally around the fiber core; viewed from the end face of the optical fiber, the three side cores are evenly distributed around the fiber core 101 in a regular triangle;

[0043] Among them, the diameter of the core 101 is 37 μm, and the numerical aperture is 0.06; the core diameter of the side core 301 is 7 μm, the numerical aperture is 0.1, the helical period is 4.5 mm, and the edge offset between the side core 301 and the fiber core 101 is 1 μm.

[0044] The refractive index of the core 101 is 1.4582, and the materials used are silica matrix, ytterbium ions, and co-dopants A...

Embodiment 2

[0046] The longitudinal helical mode transfer optical fiber of embodiment 2 is a single-clad longitudinal helical transfer silica fiber, comprising a core 101, a cladding 102 surrounding the core and a coating 104; the schematic view of its end face is as follows Figure 4 As shown, there are two layers of first layer side core 401 and second layer side core 402 of the same size that are uniformly arranged in the cladding 102 around the fiber core longitudinally; The polygons are uniformly distributed around the fiber core 101 .

[0047] Among them, the diameter of the fiber core 101 is 42 μm, and the numerical aperture is 0.065; the core diameter of the side cores 401 and 402 is 10 μm, the numerical aperture is 0.13, the helical period is 5.7 mm, and the edge offset between the side core 401 and the fiber core 101 is 2 μm.

[0048] The refractive index of the core 101 is 1.4584, and the materials used are silica matrix, ytterbium ions, and co-dopants Al ions and P ions; the ...

Embodiment 3

[0050] The longitudinal helical mode transfer optical fiber of embodiment 3 is a double-clad longitudinal helical mode transfer silica fiber comprising a core 101, a cladding 102 surrounding the core, an outer cladding 103 and a coating 104; Figure 5 As shown, in the cladding 102, there are two layers of first-layer side cores 501 and second-layer side cores 502 of two different sizes that are helically distributed around the fiber core in the longitudinal direction; 502 are uniformly distributed around the fiber core 101 in a regular hexagon.

[0051] Among them, the diameter of the fiber core 101 is 48 μm, and the numerical aperture is 0.06; the core diameter of the side core 501 is 11 μm, and the numerical aperture is 0.1; the core diameter of the side core 502 is 7.5 μm, the numerical aperture is 0.09, and the spiral period is 7 mm. The side-to-side offset from the core 101 is 3 μm.

[0052] The refractive index of the core 101 is 1.4582, and the materials used are silic...

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Abstract

The invention discloses a longitudinal spiral mode transfer optical fiber, which comprises a fiber core, a cladding and a coating layer; a silica material is taken as a substrate by the fiber core, and comprises at least one active ion and a co-doping agent; a plurality of side cores which surround the fiber core and are distributed in a longitudinal spiral structure are arranged in the cladding; the silica material is adopted by the side cores; each core diameter is at the micron dimension; the spiral cycle is at the millimeter dimension, and the edge-to-edge offset of the side core at the innermost layer and the edge-to-edge offset of the fiber core are at the micron dimension. According to the longitudinal spiral mode transfer optical fiber disclosed by the invention, as the spiral side cores with a loss mechanism are added to the cladding, the spiral side cores can be coupled with a higher order mode in the fiber core, and high loss is provided, and therefore single mode optical fiber transfer of large mode area is realized, and a new way is provided for the development of a high-power fiber laser.

Description

technical field [0001] The invention belongs to the technical field of optics and laser optoelectronics, and more specifically relates to a longitudinal helical mode transfer optical fiber. Background technique [0002] Fiber lasers have developed rapidly due to their unique advantages such as high conversion efficiency, good heat dissipation effect, high beam quality and compact structure. They are widely used in optical communications, industrial processing, biomedicine, military defense and other related fields. dominant force. [0003] In recent years, the output power of fiber lasers has continued to rise, reaching kW-level average power and MW-level peak power. However, high-power laser output will lead to too high power density in the fiber core, which will easily cause serious nonlinear effects such as stimulated Raman scattering (SRS), stimulated Brillouin scattering (SBS), and fiber damage. [0004] The existing technology usually uses a large mode area (Large Mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036
CPCG02B6/03694
Inventor 李进延赵楠李海清彭景刚戴能利王一礡廖雷罗兴
Owner HUAZHONG UNIV OF SCI & TECH
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