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Large-mode-field triple-clad optical fiber, preparation method thereof and optical fiber laser

A three-cladding, large mode field technology, applied in the optical field, can solve the problems of low melting point, difficult to meet user needs, transmission efficiency and negative impact on stability, etc., achieve high uniformity doping, improve transmission efficiency and stability. , to ensure full use of the effect

Active Publication Date: 2020-12-11
创昇光电科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these polymer-based claddings are characterized by low melting points and thermal damage thresholds, which negatively affect their transmission efficiency and stability, making it difficult to meet increasingly stringent user needs

Method used

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  • Large-mode-field triple-clad optical fiber, preparation method thereof and optical fiber laser
  • Large-mode-field triple-clad optical fiber, preparation method thereof and optical fiber laser
  • Large-mode-field triple-clad optical fiber, preparation method thereof and optical fiber laser

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preparation example Construction

[0036] The present invention also provides a method for preparing a large mode field triple-clad optical fiber comprising the following steps:

[0037] 1) preparing a porous glass core rod doped with a co-blend and then sintered as the fiber core 1;

[0038] 2) preparing a porous glass sleeve doped with germanium oxide and / or ammonium hexafluorosilicate and then sintered as the first cladding layer 2;

[0039] 3) Preparing heavily doped ammonium hexafluorosilicate and then sintering the porous glass casing as the second cladding 3;

[0040] 4) The large mode field triple-clad optical fiber can be obtained by high-temperature melting drawing by the casing method.

[0041] The present invention also provides a fiber laser using the above-mentioned large-mode-field triple-clad fiber as an output fiber.

[0042] The above is the general idea of ​​the present invention, and some also provide detailed examples and comparative examples to further illustrate the present invention. ...

Embodiment 1

[0044] In this embodiment, the fiber core is sintered porous glass doped with ytterbium chloride, aluminum chloride, ammonium dihydrogen phosphate, and cerium nitrate; the dopant , especially the high-concentration and high-uniformity distribution doping of rare earth ions, among which, the doping concentration of ytterbium ions is 20000ppm, the doping concentration of aluminum ions is 10000ppm, the doping concentration of phosphorus ions is 5000ppm, and the doping concentration of cerium ions The concentration is 3000ppm.

[0045] The first cladding layer is sintered porous glass doped with a small amount of germanium oxide (800ppm), and the second cladding layer is sintered porous glass heavily doped with ammonium hexafluorosilicate (20000ppm).

[0046] In this embodiment, the preparation method of the large mode field triple-clad optical fiber is as follows:

[0047] 1) Prepare a porous glass core rod with a diameter of 8mm as the fiber core according to the above formula;...

Embodiment 2

[0052] In this embodiment, the fiber core is sintered porous glass doped with ytterbium chloride, aluminum chloride, ammonium dihydrogen phosphate, cerium nitrate, and ammonium hexafluorosilicate; Features It can realize doping with high concentration and high uniformity distribution of dopants, especially rare earth ions, among which, the doping concentration of ytterbium ions is 26000ppm, the doping concentration of aluminum ions is 8000ppm, and the doping concentration of phosphorus ions is 8000ppm , the doping concentration of cerium ions is 3000ppm, and the doping concentration of fluorine ions is 3000ppm.

[0053]The first cladding layer is sintered porous glass doped with a small amount of ammonium hexafluorosilicate (900ppm), and the second cladding layer is sintered porous glass heavily doped with ammonium hexafluorosilicate (22000ppm).

[0054] In this embodiment, the preparation method of the large mode field triple-clad optical fiber is as follows:

[0055] 1) Pre...

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Abstract

The invention discloses a large-mode-field triple-clad optical fiber, a preparation method thereof and an optical fiber laser. The large-mode-field triple-clad optical fiber comprises a fiber core, afirst cladding wrapping the fiber core and a second cladding wrapping the first cladding. The fiber core is porous glass sintered after being doped with a co-dopant, and the co-dopant is a mixture ofytterbium ions and at least one of aluminum chloride, ammonium dihydrogen phosphate and cerous nitrate; the first cladding is porous glass that is obtained by doping with at least one of germanium oxide and ammonium hexafluorosilicate and then performing sintering; and the second cladding is porous glass sintered after heavily doping ammonium hexafluorosilicate. Porous glass is adopted as a matrixmaterial, high-concentration and high-uniformity doping of rare earth ions and fluorides can be achieved by fully utilizing the characteristic that the porous glass has nanoscale pore channels whichare communicated with one another, and the refractive indexes of the first cladding and the second cladding are controlled by adjusting the concentration of doping ions; therefore, the laser is effectively bound in the fiber core, and the transmission efficiency and stability of the optical fiber are effectively improved.

Description

technical field [0001] The invention relates to the field of optics, in particular to a triple-clad optical fiber with a large mode field, a preparation method thereof and a fiber laser. Background technique [0002] As a representative of the third-generation laser technology, fiber lasers are widely used in material processing due to their high efficiency, good heat dissipation, high beam quality, high peak power, wide spectral range, good compatibility, compact structure, and long working life. , military science and technology and optical fiber communication and other fields, among which, the conversion efficiency of ytterbium-doped fiber laser is high (980nm pumped 1080nm laser output quantum defect is only 9.26%), and has high beam quality output, wide gain bandwidth, good heat dissipation Performance, its compact structure and reliable performance enable the rapid development and rapid commercialization of high-power ytterbium-doped fiber lasers. As the most widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036G02B6/02H01S3/067
CPCG02B6/03633G02B6/02333G02B6/02395H01S3/06708
Inventor 杨旅云田光磊
Owner 创昇光电科技(苏州)有限公司
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