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Method for improving the uniformity of rare earth doped quartz glass rod

A quartz glass rod, rare earth doping technology, applied in glass manufacturing equipment, glass fiber products, manufacturing tools, etc., can solve the problems of uneven distribution of the refractive index of the core rod, uneven distribution, volatile dopant ions, etc. Improved laser efficiency and beam quality, low loss, improved axial uniformity

Pending Publication Date: 2019-07-02
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This invention patent focuses on the preparation method of large-sized ytterbium-doped core rod glass. Its shortcoming is that the refractive index distribution in the axial direction of the core rod is not uniform. During the sintering, the dopant ions are easy to volatilize, resulting in uneven distribution, which ultimately affects the consistency of the prepared large-mode-field optical fiber

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  • Method for improving the uniformity of rare earth doped quartz glass rod
  • Method for improving the uniformity of rare earth doped quartz glass rod
  • Method for improving the uniformity of rare earth doped quartz glass rod

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Embodiment 1

[0026] In this embodiment, the ytterbium-doped quartz glass rod prepared by powder sintering technology is used, and the process of stretching-stacking-stretching is repeated to improve the uniformity of the ytterbium-doped quartz glass rod. The method includes the following steps:

[0027] ①Process 6 ytterbium-doped quartz glass rods prepared based on powder sintering technology into an outer diameter of 10mm and a length of 150mm, and place the glass rods in a high-temperature drawing furnace at 1950°C to make thin rods of Φ1mm. Cut the drawn thin rod into a length of 200 mm, soak it in 10% hydrofluoric acid solution for 30 minutes, and remove surface impurities.

[0028] ②Pile the cleaned thin rods into round rods with an outer diameter of 15mm and a length of 200mm, and place them in a high-temperature drawing furnace at 1950°C to make thin rods of Φ1mm. Cut the thin rod into a length of 170mm, and soak it in a 10% hydrofluoric acid solution for 30 minutes to remove surfa...

Embodiment 2

[0034] In this embodiment, the ytterbium-doped quartz glass rod prepared by powder sintering technology is used, and the process of stretching-stacking-stretching is repeated to improve the uniformity of the ytterbium-doped quartz glass rod. The method includes the following steps:

[0035] ① Process 10 ytterbium-doped quartz glass rods prepared based on powder sintering technology into diameters of 10 mm and lengths of 150 mm, and place the glass rods in a high-temperature drawing furnace at 2000°C to make thin rods of Φ0.8 mm. Cut the drawn thin rod into a length of 200 mm, and soak it in a 5% hydrofluoric acid solution for 60 minutes to remove surface impurities.

[0036] ②Pile the cleaned thin rods into round rods with an outer diameter of 20mm and a length of 200mm, and place them in a high-temperature drawing furnace at 2050°C to make thin rods of Φ0.5mm. Cut the thin rod into a length of 180 mm, and soak it in a 5% hydrofluoric acid solution for 30 minutes to remove su...

Embodiment 3

[0041] In this embodiment, the ytterbium-doped quartz glass rod prepared by powder sintering technology is used, and the process of stretching-stacking-stretching is repeated to improve the uniformity of the rare earth-doped quartz glass rod. The method includes the following steps:

[0042] ① Eight ytterbium-doped quartz glass rods prepared by powder sintering technology were processed into diameters of 10 mm and lengths of 150 mm, and the glass rods were placed in a high-temperature drawing furnace at 2000°C to make thin rods of Φ1.2 mm. Cut the drawn thin rod into a length of 200mm, soak it in 15% hydrofluoric acid solution for 20min, and remove surface impurities.

[0043] ②Pile the cleaned thin rods into round rods with an outer diameter of 15mm and a length of 200mm, and place them in a high-temperature drawing furnace at 1980°C to make thin rods of Φ1.5mm. Cut the thin rod into a length of 160 mm, and soak it in a 15% hydrofluoric acid solution for 20 minutes to remove...

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Abstract

The invention relates to a method for improving the uniformity of a rare earth doped quartz glass rod. A large-size rare earth doped glass rod is prepared by a powder sintering technology, wherein theglass rod is stretched into a fine rod with a diameter of 0.5-2mm by a high-temperature drawing furnace, the fine rods are stacked together and stretched to a rod with a diameter of 0.5-2mm again, the process is repeated for 2-5 times, and the core rod required for optical fiber preform is finally drawn. The principle of this method is by stretching-stacking-stretching way, the non-uniformity inthe axial direction of the large-size glass rod is transformed into the non-uniformity in the radial direction. By repeated stretching, the non-uniformity in the radial direction is reduced below thewavelength scale, and the generation and transmission of the fiber laser are not affected. By improving the uniformity of the core rod, the efficiency and beam quality of the fiber laser can be improved effectively.

Description

technical field [0001] The invention relates to an optical fiber prefabricated rod, in particular to a method for preparing a large mode field rare earth doped silica optical fiber prefabricated rod core rod and improving uniformity. Background technique [0002] As the application of fiber lasers in industrial processing becomes more and more extensive and deepening, higher power requirements are put forward for fiber lasers; in order to reduce the laser power per unit area of ​​rare earth-doped silica fibers, reduce nonlinear effects, and avoid laser damage , driving the development of high-power laser fibers in the direction of large-mode-field fibers. Since 2004, the University of Southampton (Optics Express, 2004, Vol.12, No.25, pp.6088-6092) and the German Jena Photonic Technology Institute have joined forces with Heraeus (SPIE Conference Proceedings, Volume 6873 in 2008) , pp.687311-1-9) carried out the development of large mode field ytterbium-doped special optical ...

Claims

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Application Information

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IPC IPC(8): C03B37/012
CPCC03B37/01208C03B37/01211C03B2201/06C03B2203/22C03B2203/23C03B2203/42C03B2203/32
Inventor 王孟于春雷王世凯冯素雅王璠胡丽丽张磊楼风光陈丹平
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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