Triple-clad ytterbium-doped silica fiber and high-concentration fluorine-layer quartz tube sheath rod method

A silica fiber, high-concentration technology, applied in the direction of cladding fiber, multi-layer core/cladding fiber, glass fiber products, etc., can solve the problem of not completely solving the technical problems of triple-clad fiber, and achieve excellent anti-darkening performance, small nonlinear effects, effects of good thermal stability

Active Publication Date: 2021-02-02
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0007] In summary, the published papers or patents have not completely solved the technical problems of triple-clad fiber in the application of ultra-high power fiber lasers

Method used

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  • Triple-clad ytterbium-doped silica fiber and high-concentration fluorine-layer quartz tube sheath rod method
  • Triple-clad ytterbium-doped silica fiber and high-concentration fluorine-layer quartz tube sheath rod method
  • Triple-clad ytterbium-doped silica fiber and high-concentration fluorine-layer quartz tube sheath rod method

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Embodiment 1

[0042] The triple-clad ytterbium-doped silica fiber core glass composition is: Yb 2 o 3 The doping concentration is 0.25mol%, Yb 2 o 3 : CeO 2 :Al 2 o 3 :P 2 o 5 =1:0.25:8.2:12.5 (mol ratio), the rest is SiO 2 . The outer cladding is a high-concentration fluorine layer quartz tube, and there is no air bubble between the high-concentration fluorine layer quartz tube and the pure quartz glass inner cladding.

[0043] The preparation process of the three-clad ytterbium-doped silica fiber core rod in this embodiment is consistent with the patent CN109502961A;

[0044] In this embodiment, the three-clad ytterbium-doped silica fiber core rod needs to be covered with a high-concentration fluorine layer quartz tube (the concentration of fluorine element is 35000ppm), and the numerical aperture between the high-concentration fluorine layer quartz tube and the quartz inner cladding is 0.21; The structure of the equipment used in the fluorine layer quartz tube sleeve rod method...

Embodiment 2

[0057] The triple-clad ytterbium-doped silica fiber core glass composition is: Yb 2 o 3 The doping concentration is 0.2mol%, Yb 2 o 3 : CeO 2 :Al 2 o 3 :P 2 o 5 =1:0.2:8.5:13 (mol ratio), the rest is SiO 2 . The outer cladding is a high-concentration fluorine layer quartz tube, and there is no air bubble between the high-concentration fluorine layer quartz tube and the pure quartz glass inner cladding.

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Abstract

A three-clad ytterbium-doped silica optical fiber and a high-concentration fluorine-layered quartz tube sleeve rod method. Firstly, use the MCVD method to prepare the ytterbium-doped silica fiber core rod, process the regular octagon according to the required core-to-package ratio, then use the regular octagonal prefabricated mother rod as the inner lining, coat a layer of quartz tube containing a high-concentration fluorine layer, and then draw at high temperature A triple-clad silica fiber was obtained. The doping concentration of ytterbium ions in the three-clad ytterbium-doped silica fiber core glass prepared by the method is 0.2-0.25mol%, Yb 2 o 3 : CeO 2 :Al 2 o 3 :P 2 o 5 =1:0.2‑0.3:8‑8.5:12‑13 (mol ratio), this fiber is suitable for ultra-high power fiber lasers, mainly manifested in the following four advantages: first, it has extremely excellent anti-darkening performance; Second, it has a very small nonlinear effect; third, the cladding has better thermal stability; fourth, it eliminates the bubble defect at the interface between the high-concentration fluorine layer quartz tube and the pure silica glass inner cladding, avoiding the optical fiber in the tens of thousands Destruction under watts of power.

Description

technical field [0001] The invention relates to the field of special optical fibers, in particular to a three-clad ytterbium-doped silica optical fiber and a high-concentration fluorine-layered quartz tube sleeve rod method. Background technique [0002] Ytterbium-doped silica fiber lasers are widely used in industrial processing, and ytterbium-doped silica fibers are the core components of the lasers. At present, most of the silica fibers commonly used are double-clad structures. For example, nufern has realized the commercial supply of a variety of double-clad ytterbium-doped silica fibers. The core is ytterbium-doped silica glass, and the doping element is ytterbium aluminum phosphorus fluorine , the inner cladding is pure quartz glass, and the first outer cladding is a low-refractive-index coating glue, the purpose is to increase the numerical aperture of the cladding, thereby improving the absorption efficiency of pump light. As the power of fiber lasers increases, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036C03C13/04C03B37/012
CPCC03B37/01211C03B2203/32C03C13/046G02B6/036Y02P40/57
Inventor 楼风光王孟张磊于春雷陈丹平胡丽丽
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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