A double-clad ytterbium-doped optical fiber

A technology of ytterbium-doped fiber and double cladding, applied in cladding fiber, multi-layer core/cladding fiber, optics, etc., can solve the problem of high-power lasers that are difficult to work stably, difficult to break the helical light mode, and difficult to enter the fiber core To achieve the effect of improving stable working ability, improving transmission loss and thermal effect control

Active Publication Date: 2019-12-31
FENGHUO COMM SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the quantum deficit caused by the laser transition in the ytterbium-doped fiber core, this ratio is within 10% of the pumped light energy. In addition, the non-radiative transition between energy levels and the background loss of the fiber will further increase the thermal load.
The heat deposition in the fiber core will make the temperature of the fiber increase with the increase of the pumping power, which may cause the aging or damage of the coating material
In addition, even if the shape of the quartz cladding is irregular,

Method used

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  • A double-clad ytterbium-doped optical fiber
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  • A double-clad ytterbium-doped optical fiber

Examples

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Example Embodiment

[0035] Example 1

[0036] See figure 1 As shown, the embodiment of the present invention provides a double-clad ytterbium-doped optical fiber. The optical fiber includes a core, an inner cladding 20, and an outer cladding 21 from the inside to the outside. The core includes a circular shape from the inside to the outside. The central core region 10 and at least four annular doped core regions arranged concentrically with the central core region 10, and the ytterbium ion concentration of the central core region 10 and the four annular doped core regions are sequentially from the inside to the outside The inner cladding layer 20 and the outer cladding layer 21 are both quartz cladding layers.

[0037] The double-clad ytterbium-doped fiber in the embodiment of the present invention is designed with multiple annular doped core regions and combined with the double-clad design to form a dual-guided laser power combining refractive index guidance and gain in the core area Optimize the me...

Example Embodiment

[0039] Example 2

[0040] The difference between this embodiment and Embodiment 1 is that the cross-sections of the inner cladding layer 20 and the outer cladding layer 21 are both regular octagonal structures, that is, an octagonal double-cladding structure, and the vertex of the inner cladding layer 20 is located at The center line of the side length of the outer cladding 21 makes the inner cladding 20 and the outer cladding 21 orthogonal to each other, thereby breaking the spiral light of the cladding more effectively, thereby improving the pumping efficiency of the cladding.

Example Embodiment

[0041] Example 3

[0042] See figure 2 with image 3 As shown, the difference between this embodiment and Embodiment 1 is that the cross section of the inner cladding layer 20 is a regular octagonal structure, and the cross section of the outer cladding layer 21 is a centrally symmetric hexadecagon. Eight long sides and eight short sides are alternately connected, and the vertex of the inner cladding layer 20 is located on the center line of the long side of the outer cladding layer 21. During manufacturing, the hexadecagon can be formed by cutting off the eight corners on the basis of the regular octagon structure, thereby solving the problem of abnormal flow of paint caused by the sharp octagon structure, and making the manufactured Ytterbium fiber The coating consistency is higher.

[0043] The eight extension lines of the long sides cross each other to form a regular octagon, the side length of the regular octagon is L0, and the short side length of the hexadecagon is L1, L1:...

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Abstract

The invention discloses a double-clad ytterbium-doped fiber, and relates to the technical field of optical fibers. The fiber comprises, in order from the inside to the outside, a core, an inner cladding and an outer cladding; the core includes, from the inside to the outside, a circular central core region, and at least four annular doped core regions concentrically disposed with the central coreregion, wherein the concentrations of ytterbium ions of the central core region and the four annular doped core regions sequentially increases from inside to outside; and both the inner cladding and the outer cladding are quartz claddings. The double-clad ytterbium-doped fiber provided by the invention optimizes the power distribution of the ytterbium-doped fiber and improves the stable working capability under the condition of high-power fiber laser output.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a double-clad ytterbium-doped optical fiber. Background technique [0002] Semiconductor lasers and fiber optic materials are two great inventions of the 20th century. The combination of the two directly promotes the development and industrial application of fiber optic communications and fiber lasers. Fiber laser is a technology developed on the basis of EDFA technology. As early as 1961, E.Snitzer of American Optical Company carried out pioneering work in the field of fiber laser, but due to the limitation of relevant conditions, the experimental progress was relatively slow . The low-loss erbium-doped fiber in the 1980s brought new prospects for fiber lasers. [0003] In recent years, with the successful development of double-clad ytterbium-doped fibers, fiber lasers with ytterbium-doped fibers as core components have begun to develop rapidly. With the continuous mat...

Claims

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Application Information

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IPC IPC(8): G02B6/036H01S3/067
CPCG02B6/03622H01S3/06716
Inventor 罗文勇赵梓森杜城严垒
Owner FENGHUO COMM SCI & TECH CO LTD
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