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Efficient cooling method for high-power optical fibre

A cooling method and high-power technology, which are applied in the field of optical fiber cooling and efficient cooling of high-power optical fibers, and can solve the problems of increasing the output power of fiber lasers.

Inactive Publication Date: 2014-09-10
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fixed structure of the mechanical thermal layer and the fixed shape of the optical fiber, it may be inconvenient in practical application; in addition, most of the literature can only directly contact and conduction cooling on the surface of the optical fiber (such as CN101222109A, CN101373882A), it is difficult to control the optical fiber. The direct conduction cooling of the entire cylindrical surface actually limits the further improvement of the fiber laser output power

Method used

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  • Efficient cooling method for high-power optical fibre
  • Efficient cooling method for high-power optical fibre
  • Efficient cooling method for high-power optical fibre

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Embodiment 1

[0048] attached figure 2 It is a schematic diagram of cooling high-power optical fiber and fusion splicing point of the present invention. In the figure, the optical fiber 21 to be cooled and the coated splicing point 22 are inserted into a metal sleeve with a suitable size (for example, for a high-power optical fiber with an outer cladding of 600 microns, the inner diameter of the metal sleeve can be 1000 microns, and the outer diameter is 2000 microns). In the pipe 23, the metal sleeve is placed in the flowing cooling liquid (such as cooling water) 25 inside the heat sink 24; a heat-conducting medium (such as heat-conducting silicone grease) 26 is injected between the optical fiber and the fusion point and the metal sleeve to improve the doped optical fiber The thermal conductivity between the copper tube and the heat sink is connected with a flowing coolant 25; the interface between the metal sleeve and the thermal layer is filled with waterproof material (such as waterpro...

Embodiment 2

[0051] Figure 4 A schematic diagram of cooling a high-power optical fiber with a serpentine metal sleeve provided by the present invention. In the figure, at first the optical fiber 31 to be cooled is inserted into a metal sleeve 32 of suitable size (for example, for a high-power optical fiber with an outer cladding of 600 microns, the inner diameter of the metal sleeve can be 1000 microns, and the outer diameter is 2000 microns), A heat-conducting medium (such as heat-conducting silicone grease) 34 is filled between the metal sleeve and the optical fiber to increase the thermal conductivity; the metal sleeve containing the optical fiber is bent into a serpentine shape and placed in the heat sink 33, and the inside of the heat sink is passed through a cooling liquid ( Such as cooling water) 35, the interface between the metal sleeve and the thermal layer is filled with waterproof material (such as waterproof paint) 36 to prevent the coolant from seeping out; during the coolin...

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Abstract

The invention relates to an efficient cooling method for a high-power optical fibre. The efficient cooling method consists of the high-power optical fibre, a hollow cylindrical metal sleeve, a heat sink which contains flowing cooling liquid inside, a heat conductive medium and a waterproof material. The method comprises the following steps that: the high-power optical fibre to be cooled is put in the hollow cylindrical metal sleeve of a proper size; the heat conductive medium with a high heat conductive coefficient is injected into a clearance between the fibre and the metal sleeve; the heat conductive medium transmits heat of the fibre to the metal sleeve; the metal sleeve is directly put in the flowing cooling liquid of the heat sink, so that heat of the metal sleeve is taken away by the flowing cooling liquid; the waterproof material is filled at input and output ports of the metal sleeve and a junction of the heat sink, thereby preventing the cooling liquid from flowing out. The efficient cooling method for the high-power optical fibre disclosed by the invention effectively increases a contact area between the optical fibre and a cooling medium and increases a coefficient of heat conduction, is capable of decreasing temperature of a core of the optical fibre and a clad layer, increasing an output power of a high-power fibre laser, and enhancing stability of a system, performs bending at any radius in a permitted range of the optical fibre by the metal sleeve, and can perform convenient shape control upon the optical fibre.

Description

technical field [0001] The invention belongs to the field of optical fiber lasers, and relates to an optical fiber cooling method, in particular to an efficient cooling method for high-power optical fibers. Background technique [0002] High-power fiber lasers are widely used in 3D printing, laser cutting, laser cladding and other fields. In recent years, with the double-clad fiber manufacturing process and the power increase of high-brightness semiconductor lasers, the output power of single-channel high-power fiber laser has been developed rapidly, from 100 watts at the beginning of the 21st century to the current 10 kilowatts. For a specific fiber laser, its quantum efficiency is certain, and the quantum deficit makes the lost power released into the doped fiber in the form of heat (see W.Yong, X.Chang-Qing, and P.Hong, "Thermal effects in kilowatt fiber lasers,"IEEE Photonics Technology Letters,2004,16,63-65); In addition, due to factors such as fiber defects and splici...

Claims

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Application Information

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IPC IPC(8): H01S3/042H01S3/067
Inventor 王小林陶汝茂周朴张坤张汉伟马鹏飞粟荣涛于海龙许晓军司磊陈金宝刘泽金
Owner NAT UNIV OF DEFENSE TECH