A rare earth doped optical fiber

A rare earth doped fiber technology, applied in clad fibers, multi-layer core/clad fibers, lasers, etc., can solve non-circular preform drawing diameter and tension fluctuations, large differences in fiber parameters, and lasers. Short life and other problems, to achieve the effect of increasing the laser withstand power, reducing the number of cutting times, and improving the success rate of cutting

Active Publication Date: 2017-11-07
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a rare earth doped optical fiber for laser, the purpose of which is to add quartz with a lower refractive index between the quartz cladding and the low refractive index organic coating cladding. Cladding, which solves the problem that the rare earth-doped optical fiber coating for lasers is easy to age, which leads to the short life of the laser, and at the same time solves the technical problem of the large difference in fiber parameters caused by non-circular preform drawing wire diameter and tension fluctuations

Method used

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Examples

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Effect test

Embodiment 1

[0052] A rare-earth-doped optical fiber for a laser, such as figure 1 As shown, it includes a doped core, a first quartz cladding, a second quartz cladding, an organic coating cladding, and an outer layer from the inside to the outside;

[0053] The numerical aperture of the doped core relative to the first quartz cladding is 0.06. Its cross section is circular, and its radius is between 25 μm. The core doping composition is 1.2%wt Yb 2 o 3 , 3.5% wt P 2 o 5 , 3.0% wt Al 2 o 3 .

[0054] The first quartz cladding is a pure quartz layer with a regular octagonal cross-section and a radius of 182.5 μm. The radius of the first quartz cladding refers to half the distance between two parallel opposite sides of the octagon.

[0055] The numerical aperture of the second quartz cladding relative to the first quartz cladding is 0.22; the second quartz cladding is a fluorine-doped quartz layer with a mass percentage of 5% fluorine. The inner shape of the cross-section of the se...

Embodiment 2

[0063] A rare-earth-doped optical fiber for a laser, such as figure 2 As shown, it includes a doped core, a first quartz cladding, a second quartz cladding, an organic coating cladding, and an outer layer from the inside to the outside;

[0064] The numerical aperture of the doped core relative to the first quartz cladding is 0.2. Its cross section is circular, and its radius is between 5 μm. The core doping composition is 1.0%wt Yb 2 o 3 , 3.5% wt P 2 o 5 , 6.2% wt Al 2 o 3 .

[0065] The first quartz cladding is a pure quartz layer with a regular hexagonal cross-sectional shape and a radius of 65 μm. The radius of the first quartz cladding refers to half the distance between two parallel opposite sides of the hexagon.

[0066] The numerical aperture of the second quartz cladding relative to the first quartz cladding is 0.12; the second quartz cladding is a fluorine-doped quartz layer, and the mass percentage of fluorine doping is 1.18%. The inner shape of the cross...

Embodiment 3

[0074] A rare-earth-doped optical fiber for a laser, such as image 3 As shown, it includes a doped core, a first quartz cladding, a second quartz cladding, an organic coating cladding, and an outer layer from the inside to the outside;

[0075] The numerical aperture of the doped core relative to the first quartz cladding is 0.1. Its cross section is circular, and its radius is between 100 μm. The core doping composition is 1.0%wt Yb 2 o 3 , 3.5% wt P 2 o 5 , 4.1% wt Al 2 o 3 .

[0076] The first quartz cladding is a pure quartz layer with a regular octagonal cross-sectional shape and a radius of 200 μm. The radius of the first quartz cladding refers to half the distance between two parallel opposite sides of the octagon.

[0077] The numerical aperture of the second quartz cladding relative to the first quartz cladding is 0.20; the second quartz cladding is a fluorine-doped quartz layer, and the fluorine-doped mass percentage is 3.96%. The inner shape of the cross-s...

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Abstract

The present invention discloses a rare earth doped optical fiber. The optical fiber includes a doped fiber core, a first quartz cladding, a second quartz cladding and an organic coating cladding from the inside to the outside. The second quartz cladding has a numerical aperture of 0.1-0.24 relative to the first quartz cladding; and the organic coating has a numerical aperture greater than or equal to 0.35 relative to the first quartz cladding. The optical fiber greatly reduce light leakage of the organic coating cladding, is higher in the reliability of long-term working and longer in usage life.

Description

technical field [0001] The invention belongs to the field of optical fiber laser technology, and more specifically relates to a rare earth-doped optical fiber for lasers. Background technique [0002] Fiber laser is a kind of laser that uses optical fiber as laser gain medium. By doping different rare earth ions in the fiber quartz matrix, laser output in different bands can be obtained. Fiber lasers have been widely used in industrial processing, medical, military and communication fields due to their high beam quality, large specific surface area, good heat dissipation, high conversion efficiency, small size, compact structure, and easy maintenance. [0003] In the early days, single-clad rare-earth-doped fibers were used, requiring the pump light to be directly injected into the fiber core. When the pump power gradually increases, it is difficult to further improve the pump light injection efficiency for a fiber core with only a few tens of μm. and power, a certain thick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036H01S3/067
CPCG02B6/036H01S3/06708
Inventor 杨玉诚黄宏琪郑伟钟力王鹏岳天勇汪松童维军曹蓓蓓
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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