Rare-earth element doped glass double-clad optic fibre and mfg. method thereof

A rare earth element and double-clad technology is applied in the field of rare earth element-doped glass double-clad optical fiber and its preparation. The effect of large gain and simple preparation and drawing process

Inactive Publication Date: 2003-03-12
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a kind of non-quartz matrix multi-component glass to prepare double-clad optical fiber, which can effectively overcome the low doping concentration of rare earth ions and the gain Small, narrow composition range, high preparation cost, complex preparation process and other deficiencies

Method used

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  • Rare-earth element doped glass double-clad optic fibre and mfg. method thereof
  • Rare-earth element doped glass double-clad optic fibre and mfg. method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0034] Specific Example 1-Group 1 Materials

[0035] Group 1

Group 2

Group 3

Composition (mol%)

Fiber core

Inner cladding

Fiber core

Inner cladding

Fiber core

Inner cladding

P 2 O 5

60.0

61.0

55.0

54.5

70

71

Al 2 O 3

4.0

4

5.0

5.0

7

8

BaO

10.0

10.0

14.0

16.5

4

4

Na 2 O

4.0

4.5

3.0

3.0

8

8

K 2 O

15.0

15.5

13.0

13.0

5.6

5

Nb 2 O 5

0.4

0.4

2

2

0.5

0.5

La 2 O 3

0.3

0.3

1.5

1.5

0.3

2.8

Y 2 O 3

0.2

5.3

4.5

4.4

0.5

0.5

Group 1

Group 2

Group 3

Composition (mol%)

Fiber core

Inner cladding ...

specific Embodiment 2

[0041] Specific Example 2-Group 2 and 3 Materials

[0042] The glass formulations of the second and third groups are shown in Table 3. The melting process of the core material and the inner cladding glass is the same as that of Example 1.

[0043] For the second group, the core rod glass is processed into a diameter of 3mm (d 芯棒 =500d 芯 ), the preform with a length of 60mm, the inner cladding preform is processed into a processing size of 50mm×50mm×80mm (d 包棒 =(400×400)d 包 ), drill an inner hole with a diameter of 2mm and an inner cladding rod with a depth of 60mm at the center of the upper and lower end faces. The subsequent steps and wire drawing process are the same as in Example 1. The final numerical aperture of the double-clad fiber composed of the second core material and inner cladding material is 0.08, the core diameter is 6 μm, the inner cladding side length is 125 μm, and the outer diameter is φ170 μm. For the third group, the core rod glass is processed into a diameter...

specific Embodiment 3

[0044] Specific Example 3-4th, 5th and 6th group materials

[0045] The fourth, fifth, and sixth groups in Table 4 are all phosphate glass systems as the core material, and silicate glass systems as the inner cladding.

[0046]For the fourth, fifth, and sixth groups, the melting of the core glass is the same as in the specific embodiment 1. The melting of the inner cladding glass is a raw material synthesized according to the inner cladding formula selected by the above-mentioned silicate glass system Take 3000 grams and mix it evenly and melt it directly in a 2.0 liter platinum crucible at a melting temperature of 1350°C. Stirring and clarification are carried out in sequence. The whole process takes more than 5 hours. Finally, it is cast on an iron mold with a size of 120mm×70mm×50mm, and then moved into a muffle furnace preheated to a material transition temperature Tg of 460℃ for annealing. It is held for 2 hours and then cooled to 380℃ at a rate of 2℃ / hr. Then lower to room t...

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Abstract

An RE doped optical fibre with dual glass clad layers, that is, coaxial internal and external clad layers. The fibre core is made of phosphate glass system. The internal clad layer is made of phosphate (or silicate) glass system. Its preparing process includes choosing the raw glass materials for fibre core and internal clad layer, melting, preparing prefabricated rod, and drawing. Its advantages are high concentration of doped RE ions, and gain, big excited emitting area, wide tunning range and low cost.

Description

Technical field: [0001] The invention relates to a glass double-clad optical fiber doped with rare earth elements and a preparation method thereof, in particular to a multi-component glass material with an optical fiber core material (core material for short) and a non-quartz matrix as the inner cladding, and the outer cladding is plastic Double-clad fiber and its preparation method. Background technique: [0002] The fiber laser is a laser resonant cavity formed by a fiber doped with some rare earth elements and an optical feedback element. Under the action of the pump light, the doped fiber medium generates stimulated emission and forms a laser with a certain wavelength range. It has the advantages of low threshold, high efficiency, narrow line width, and tunability. The characteristics of fiber lasers determine that it has more advantages than semiconductor lasers and other large lasers. However, the original fiber laser directly couples the pump light into a fiber core with a...

Claims

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Application Information

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Inventor 姜中宏戴世勋杨建虎
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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