Ytterbium-doped active optical fiber and preparation method thereof

A technology of optical fiber preform and optical fiber, which is applied in the field of ytterbium-doped active optical fiber and its preparation, can solve the problems that the concentration of ytterbium ions cannot be increased infinitely, and achieve the effects of reducing nonlinear effects, improving cladding absorption, and reducing the length of optical fibers

Inactive Publication Date: 2020-03-24
JIANGSU FASTEN OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the influence of the preparation process, the concentration of ytterbium ions in the active optical fiber cannot be increased infinitely, and although the pump absorption efficiency of the octagonal or D-type active optical fiber has been significantly improved, the highest absorption efficiency can only be close to 80 %, more than 20% of the pump light is not absorbed by the ytterbium ions in the core

Method used

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  • Ytterbium-doped active optical fiber and preparation method thereof
  • Ytterbium-doped active optical fiber and preparation method thereof

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preparation example Construction

[0060] The preparation method of above-mentioned ytterbium-doped active optical fiber, it comprises the steps:

[0061] (1) Pretreatment of the substrate tube: Pickling of the substrate tube and preheating of the substrate tube effectively eliminate impurities and air bubbles on the inner wall of the substrate tube. The substrate tube is finally collapsed to form the first inner cladding 2 .

[0062] (2) Pass the base tube into SiCl at 1500-1650°C 4 Gas for soot body deposition of silica, SiCl 4 The volume flow rate of the feed is 100-300 sccm. After the deposition, the tail pipe of the base pipe is cut off, and then immersed in the aqueous solution 1 for 0.2-1 hour. After the immersion, N 2 Blow dry the moisture in the silicon dioxide loose body layer, soak in aqueous solution 1 containing AlCl 3 , YbCl 3 and H3PO 4 , AlCl 3 The molar concentration of YbCl is 0.01~3mol / L, YbCl 3 The molar concentration of H is 0.01~1mol / L, H 3 PO 4 The molar concentration is 0.01-2.5...

Embodiment 1

[0080] A highly absorbing ytterbium-doped active optical fiber and a preparation method thereof, comprising the steps of:

[0081] (1) Base tube pretreatment, pickling the base tube, preheating and effectively eliminating impurities and air bubbles on the inner wall of the base tube;

[0082] (2) Pass the substrate tube into SiCl at 1550°C 4 Gas for soot body deposition of silica, SiCl 4 The volume flow rate of feeding is 200sccm, cut off the tailpipe of the base pipe after the deposition is completed, and then soak in the soaking aqueous solution for 0.3 hours, and pass N into the base pipe after the immersion ends. 2 Blow dry the moisture in the silica loose body layer, and soak in the aqueous solution containing AlCl 3 , YbCl 3 and H 3 PO 4 , AlCl 3 The molar concentration is 0.25%, YbCl 3 The molar concentration is 0.05%, H 3 PO 4 The molar concentration is 0.2%;

[0083] (3) Reattach the tailpipe to the base pipe after drying in step (2), and first pass O at 860...

Embodiment 2

[0092] A highly absorbing ytterbium-doped active optical fiber and a preparation method thereof, comprising the steps of:

[0093] (1) Base tube pretreatment, preheating the base tube and effectively eliminating impurities and air bubbles on the inner wall of the base tube;

[0094] (2) Pass the substrate tube into SiCl at 1600°C 4 Gas for soot body deposition of silica, SiCl 4 The volume flow rate of feeding is 150 sccm, cut off the tail pipe of the substrate pipe after the deposition is completed, then immerse in the soaking aqueous solution for 0.5 hour, and feed N into the substrate pipe after the immersion ends. 2 Blow dry the moisture in the silica loose body layer, and soak in the aqueous solution containing AlCl 3 , YbCl 3 and H3PO 4 , AlCl 3 The molar concentration is 0.4%, YbCl 3 The molar concentration is 0.2%, H 3 PO 4 The molar concentration is 0.5%;

[0095] (3) Reattach the tailpipe to the base pipe after drying in step (2), and first pass O at 900°C. ...

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Abstract

The invention discloses an ytterbium-doped active optical fiber and a preparation method thereof. The optical fiber structurally and sequentially comprises a core layer positioned at the center and having a circular cross section, a first inner cladding made of a pure quartz material, a second inner cladding, an outer cladding with the lowest relative refractive index, and a protection layer frominside to outside, wherein the outer side of the cross section of the second inner cladding is octagonal, the first inner cladding is a base pipe, the refractive index of the first inner cladding is not changed, and the refractive index of the second inner cladding located on the outer side of the first inner cladding is gradually reduced from inside to outside. According to the invention, the change trend of the refractive index profile of the second inner cladding is in an arc-shaped convex shape, so that pump light introduced into the inner cladding can be effectively gathered and collectedat a position close to the core layer through the technical scheme so as to improve the passing-through-core-layer probability of the pump light of the cladding to improve the absorption of the cladding.

Description

technical field [0001] The invention relates to an ytterbium-doped active optical fiber and a preparation method thereof. Background technique [0002] Due to its small size, good heat dissipation, high stability, good beam quality, and high slope efficiency, fiber lasers have gradually become the leading force in the laser industry, and have always attracted the attention of scholars and engineers in this field. Widely used in industrial processing, weapons and medical equipment and other aspects. Among them, the large mode field double-clad ytterbium-doped active fiber, which is the most important component in the Yb-doped active fiber laser, the design of its structure and composition is crucial to the performance of the fiber laser. [0003] The absorption coefficient is an important index in the performance of the Yb-doped active fiber. The level of the absorption coefficient determines the length of the Yb-doped active fiber in the fiber laser. A low absorption coeffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/027C03B37/018C03B37/012
CPCC03B37/012C03B37/018C03B37/01853C03B37/027C03B2203/04C03B2203/22C03B2203/32
Inventor 张俊逸冯术娟赵霞缪振华韩婷婷徐律卞新海周震华
Owner JIANGSU FASTEN OPTOELECTRONICS TECH
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