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Three-cladding ytterbium-doped quartz optical fiber and high-concentration fluorine-layer quartz tube rod sleeving 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 non-linear effects, reduced use length effects

Active Publication Date: 2020-04-17
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Claims
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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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  • Three-cladding ytterbium-doped quartz optical fiber and high-concentration fluorine-layer quartz tube rod sleeving method
  • Three-cladding ytterbium-doped quartz optical fiber and high-concentration fluorine-layer quartz tube rod sleeving method
  • Three-cladding ytterbium-doped quartz optical fiber and high-concentration fluorine-layer quartz tube rod sleeving 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

The invention discloses a three-cladding ytterbium-doped quartz optical fiber and a high-concentration fluorine-layer quartz tube rod sleeving method. The method comprises the following steps: preparing an ytterbium-doped quartz optical fiber core rod by using an MCVD method, processing the core rod into a regular octagon according to a required core-cladding ratio, sleeving the regular octagon prefabricated mother rod serving as a lining with a layer of quartz tube containing a high-concentration fluorine layer, and carrying out drawing at high temperature to obtain the three-cladding quartzoptical fiber. The doping concentration of ytterbium ions in the three-cladding ytterbium-doped quartz optical fiber core glass prepared by the method is 0.2-0.25 mol%, and Yb2O3: CeO2: Al2O3: P2O5 is1: (0.2-0.3): (8-8.5): (12-13) (mol ratio). The optical fiber is suitable for an ultrahigh-power optical fiber laser, and mainly shows the following four advantages: firstly, the optical fiber has extremely excellent darkening resistance; secondly, a very small nonlinear effect is achieved; thirdly, the claddings have better thermal stability; and fourthly, the bubble defect at the interface of the high-concentration fluorine-layer quartz tube and the pure quartz glass inner cladding is eliminated, and the optical fiber is prevented from being damaged under the power of ten thousand watts.

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 Applications(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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