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A kind of preparation method of tapered core fiber with gradually changing core-to-clad ratio and tapered core fiber

A tapered core and core wrap technology, applied in cladding fibers, glass fibers, optical waveguides, etc., can solve the problems of reducing laser output power, thermally induced mode instability, reducing pump light absorption efficiency, etc. Effects of output power, increased absorption, increased thermally induced mode instability threshold

Active Publication Date: 2021-11-09
武汉光谷航天三江激光产业技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the tapered fiber, the optical path of the pump light transmitted in the cladding is shorter than that in the uniform fiber, which reduces the absorption efficiency of the pump light to a certain extent
At the same time, when the doping concentration of rare earth ions in the fiber core remains unchanged, the overlap factor of the pump light on the entire tapered fiber remains unchanged, resulting in a certain thermal effect that will inevitably occur during forward pumping. This in turn leads to thermally induced mode instability effects, reducing laser output power

Method used

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  • A kind of preparation method of tapered core fiber with gradually changing core-to-clad ratio and tapered core fiber
  • A kind of preparation method of tapered core fiber with gradually changing core-to-clad ratio and tapered core fiber
  • A kind of preparation method of tapered core fiber with gradually changing core-to-clad ratio and tapered core fiber

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Experimental program
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Effect test

Embodiment 1

[0054] In this embodiment, a method for designing and manufacturing a cone-core ytterbium-doped optical fiber with a gradually changing core-to-clad ratio, the specific method and steps are as follows:

[0055] Step 1, the SiCl 4 with O 2 Pass into the axially rotating reaction tube together, the hydrogen-oxygen flame is externally heated, and SiO is deposited on the inner wall of the reaction tube 2 A loose layer of glass particles.

[0056] Step 2, 6.0g YbCl 3 ·6H 2 O was dissolved in 500mL deionized water to make a solution, injected into the reaction tube, soaked for 3h, and carried out Yb 3+ Doped.

[0057] Step 3, discharge YbCl 3 ·6H 2 O aqueous solution, drying the reaction tube, sintering at 1650°C at high temperature to achieve vitrification of the loose layer, and then melting and shrinking at 1850°C to form a solid prefabricated core rod.

[0058]Step 4, after machining and polishing the solid prefabricated rod mandrel, a conical mandrel is obtained, and th...

Embodiment 2

[0062] Step 1: prepare a quartz reaction tube, clean the quartz reaction tube, install a rotary joint on the inlet section of the quartz reaction tube, install the quartz reaction tube on a deposition lathe, and preheat the quartz reaction tube externally with an oxyhydrogen flame. Quartz reaction tube, during the preheating process, gradually increase the temperature of the quartz reaction tube to 1200°C. After the temperature of the reaction tube is heated to 1750°C, SiCl is introduced into the quartz reaction tube according to the preset flow rate. 4 、GeCl 4 with O 2 , during the repeated rotation of the reaction tube, a loose layer of glass particles with a specified thickness of 1.5 cm is deposited on the inner wall of the reaction tube. The loose layer of glass particles is SiO 2 and GeO 2 .

[0063] Step 2, carry out Nd 3+ 5.2g Nd(NO 3 ) 3 ·6H 2 O was dissolved in 500mL of absolute ethanol to make a solution, injected into the reaction tube, soaked for 2h, and c...

Embodiment 3

[0069] Step 1, the SiCl 4 , POCl 3 with O 2 Pass into the axially rotating reaction tube together, the hydrogen-oxygen flame is externally heated, and SiO is deposited on the inner wall of the reaction tube 2、 P 2 o 5 A loose layer of glass particles.

[0070] Step 2, carry out Er 3+ Doped. 6.2gErCl 3 ·6H 2 O was dissolved in 400mL of absolute ethanol to make a solution, injected into the reaction tube, soaked for 2.5h, and performed Er 3+ Doped.

[0071] Step 3, discharge ErCl 3 ·6H 2 O absolute ethanol solution, drying the reaction tube, sintering at a high temperature of 1350 ° C to achieve vitrification of the loose layer, and then melting and shrinking at 1860 ° C to form a solid prefabricated rod mandrel.

[0072] Step 4, after machining and polishing the solid prefabricated rod mandrel, a conical mandrel is obtained, and the diameter of the end face of the mandrel is D 1 =5cm, the length L of mandrel 1 =200cm.

[0073] Step five, machining the inner wall ...

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Abstract

The invention belongs to the technical field of optical fiber manufacturing, and specifically discloses a preparation method of a tapered-core optical fiber with a gradually changing core-to-clad ratio and the tapered-core optical fiber. The method includes: depositing a loose layer of glass particles on the inner wall of the reaction tube; doping the loose layer of glass particles with rare earth ions; drying and sintering the reaction tube at high temperature, so that the loose layer of glass particles is vitrified and melted into a solid prefabricated Rod mandrel, and then polished to obtain a conical mandrel with a specified cone angle; processing to obtain a cylindrical glass rod with a conical hole, combining a glass rod with a conical hole and a conical mandrel to obtain The tapered core active optical fiber preform is put into a drawing tower to make a tapered core fiber with a gradually changing core-to-clad ratio. The tapered core fiber is prepared by the above method. The core-clad ratio of the tapered core optical fiber prepared by the invention gradually changes with the length of the fiber, which can improve the pump light absorption of the fiber, balance the heat production of the fiber, and increase the output power of the laser.

Description

technical field [0001] The invention belongs to the technical field of optical fiber manufacturing, and more specifically relates to a preparation method of a tapered-core optical fiber with a gradually changing core-to-clad ratio and the tapered-core optical fiber. Background technique [0002] High-power narrow-linewidth fiber lasers have the advantages of small size, light weight, good beam coherence, good beam quality, and excellent thermal management performance. They are widely used in industrial processing, intelligent manufacturing, biomedicine, and beam synthesis. With the expansion of application fields, higher requirements are put forward for the output power and beam quality of high-power narrow-linewidth fiber lasers. At present, the output power of a single high-power narrow-linewidth fiber laser has reached the kilowatt level. As the power is further increased, nonlinear effects and thermally induced mode instability effects become the main factors that limit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/018C03B37/012G02B6/02
CPCC03B37/01211C03B37/018C03B37/01838C03B37/01853C03B37/01861G02B6/02395
Inventor 王锦航杨雨雷敏戴玉芬武春风李强姜永亮刘厚康宋祥
Owner 武汉光谷航天三江激光产业技术研究院有限公司
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