Thulium-doped tellurate glass doubly-clad optical fiber and preparation method thereof

A technology of double-clad optical fiber and tellurite glass, applied in clad optical fiber, multi-layer core/clad optical fiber, etc., can solve problems such as limitations, and achieve the effect of low cost, low loss and large gain

Active Publication Date: 2012-04-18
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

In the previous research, due to key defects such as tellurite glass matrix composition and fiber structure, the higher ~2 micron laser output of tellurite glass fiber was limited.

Method used

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  • Thulium-doped tellurate glass doubly-clad optical fiber and preparation method thereof
  • Thulium-doped tellurate glass doubly-clad optical fiber and preparation method thereof
  • Thulium-doped tellurate glass doubly-clad optical fiber and preparation method thereof

Examples

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preparation example Construction

[0047] ①Preparation of core glass: select the formula of the core glass as claimed in claim 1 and weigh the raw materials, mix the powdered raw materials thoroughly, dry them in a muffle furnace at 200°C for 10 hours, and then put platinum or Melting in a gold crucible, the melting temperature is 1100°C, the raw materials are completely melted under the protection of dry oxygen, after being fully stirred, dry oxygen is introduced to remove water, clarified and homogenized, then taken out, poured into a preheated steel mold, placed in a glass transition temperature T g Keep warm near the point for 5 hours, then drop to 100°C at 1°C / hour, then turn off the power of the annealing furnace, and let it cool down to room temperature naturally;

[0048] ② The preparation process of the inner cladding glass is the same as the preparation process of the core glass except for the different components;

[0049] ③The preparation process of outer cladding glass is the same as the preparati...

Embodiment 2

[0056] The composition of Example 2 is shown in Table 1, and the components were adjusted accordingly. The melting temperature was 1050°C, and the annealing rate was 2°C / hour down to 100°C. At 520°C, the single-clad preform is drawn into a thin round rod with a diameter of 5mm; at 550°C, the double-clad optical fiber preform is drawn into a double-clad optical fiber with a diameter of 400μm. The specific process of preparation With embodiment 1.

[0057] The compositions of Examples 3-4 are shown in Table 1, and the components were adjusted accordingly. The melting temperature was 1000°C, and the annealing rate was 2°C / hour down to 100°C. At 510°C, the single-clad preform is drawn into a thin round rod with a diameter of 3mm; at 540°C, the double-clad optical fiber preform is drawn into a double-clad optical fiber with a diameter of 300μm. The specific process of preparation With embodiment 1.

Embodiment 5

[0058] The composition of Example 5 is shown in Table 1, and the components were adjusted accordingly. The melting temperature was 1200°C, and the annealing rate was 1°C / hour down to 100°C. At 600°C, the single-clad preform is drawn into a thin round rod with a diameter of 8mm; at 600°C, the double-clad optical fiber preform is drawn into a double-clad optical fiber with a diameter of 500μm. The specific process of preparation With embodiment 1.

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Abstract

The invention relates to thulium-doped tellurate glass doubly-clad optical fiber and a preparation method thereof. Thulium-doped tellurate glass used as a fiber core comprises the following ingredients in mole percentage: 40 to 90 mol% of TeO2, 5 to 40 mol% of WO3, 0 to 5 mol% of Nb2O5, 0 to 5 mol% of BaO, 0 to 14.9 mol% of La2O3, 0 to 20 mol% of GeO2, 0 to 5 mol% of R2O (R is Li, Na, K), 0 to 5 mol% of P2O5 and 0.1 to 5 mol% of Tm2O3. The preparation method comprises the following steps of: preparing the fiber core, inner cladding glass and outer cladding glass by utilizing a fusion method, preparing an optical fiber prefabricated rod by adopting a rod-in-tube technique, and drawing twice by adopting an appropriate wiredrawing process to obtain the doubly-clad tellurate glass optical fiber, wherein the loss at 1.3mu m is less than 2.9dB / m. The doubly-clad tellurate glass optical fiber has favorable anti-devitrification stability, higher glass-transition temperature and softening temperature and lower thermal expansion coefficient compared with common tellurate glass and accords with the single mold transmission condition. Proved by experiments, the optical fiber can realize output of 2nm-class laser under the pumping of an 800nm commercial laser diode, and the full width at half maximum (FWHM) of a laser spectrum reaches 15nm.

Description

technical field [0001] The invention relates to a double-clad optical fiber, in particular to a double-clad optical fiber doped with thulium tellurate glass and a preparation method thereof. Background technique [0002] 2.0 μm infrared fiber laser has broad application prospects in laser medical treatment, eye safety lidar, remote sensing detection, atmospheric monitoring, etc., and has attracted extensive attention in recent years. Tm doping in many matrix materials such as fused silica, fluoride, germanate, tellurite glass 3+ ( 3 f 4 → 3 h 6 ) or Ho 3+ ( 5 I 7 → 5 I 8 ) can obtain 2.0μm laser output. Fluoride glass phonon energy is very low (540cm -1 ), but because of its complex preparation process, poor chemical stability and poor mechanical properties, it is difficult to be practical. Fused silica glass has good physical properties, but its phonon energy is high (1100cm -1 ), and the solubility of rare earths is poor. The higher melting temperature and ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036C03C13/04
CPCC03C13/048C03C3/122C03C4/12
Inventor 李科峰张光胡丽丽陆龙祥凡思军
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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