CN110676677A - Kilowatt-level cladding light stripper in optical fiber laser - Google Patents
Kilowatt-level cladding light stripper in optical fiber laser Download PDFInfo
- Publication number
- CN110676677A CN110676677A CN201910972014.2A CN201910972014A CN110676677A CN 110676677 A CN110676677 A CN 110676677A CN 201910972014 A CN201910972014 A CN 201910972014A CN 110676677 A CN110676677 A CN 110676677A
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- optical fiber
- cladding light
- kilowatt
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- fiber laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0401—Arrangements for thermal management of optical elements being part of laser resonator, e.g. windows, mirrors, lenses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0407—Liquid cooling, e.g. by water
Abstract
The invention discloses a kilowatt-level cladding light stripper in an optical fiber laser, which adopts a micro-channel water cooling technology to dissipate heat and can realize the stripping of kilowatt-level cladding light; the device comprises a heat sink shell, a glue filling hole, an optical fiber, a micro-channel, a water inlet and a water outlet; the glue filling hole is arranged in the heat sink shell, the optical fiber is arranged in the center of the inner part of the glue filling hole, the micro channel is arranged in the glue filling hole around the optical fiber, and the water inlet and the water outlet are arranged at two ends of the micro channel; the outer surface layer of the optical fiber is coated with high-refractive-index glue, and the glue filling holes are filled with the high-refractive-index glue. The invention has the technical effects that: when the kilowatt-level cladding light is stripped, the heat dissipation is uniform and the temperature rise is low; taking the example of stripping 1000W of cladding light, the maximum temperature is 297K and the minimum temperature is 287K, and the cladding light stripper can stably and safely work.
Description
Technical Field
The invention relates to the technical field of fiber laser devices, in particular to a kilowatt-level cladding light stripper in a fiber laser.
Background
Cladding in fiber laser systemsWhen the optical stripper removes cladding light such as residual pump light and high-order laser, the photo-thermal conversion can generate a large amount of heat influencing system performance, so that the efficient dissipation of heat energy becomes a current research hotspot. Researchers at home and abroad propose different techniques for stripping cladding light, including high refractive index glue method and acid etching method, etc. (Wetter a, Faucher M, Sevigny B2008 proc. spie 6873687327), (Kliner a, Hou K C,
M,Hupel C,Stelzner T,Schreiber T,Eberhardt R,Tünnermann A 2013 Proc.SPIE 861686160N-1)，(Babazadeh A,Nasirabad R R,Norouzey A,Hejaz K,Poozesh R,HeidariazarA,Golshan A H,Roohforouz A,Jafari S N T,Lafouti M 2014 Appl.optics 532611)]. The high performance cladding stripper requires large power attenuation coefficient, low fiber core light transmission loss and small temperature rise coefficient, can work safely and stably under high laser power output [ (Sun Jing, Zhoushezzhen, Chen Han, in the sea Juan, Wang Xubao, Lin Chun 2017 laser and optoelectronics progress 54110001)]. However, due to the problems of the preparation process, when the conventional cladding light stripper at home and abroad is used for processing kilowatt-level cladding light, the phenomenon that the local temperature of the front end of the optical fiber is suddenly increased within a range of several millimeters can occur, and the problem of heating concentration needs to be further solved.
Disclosure of Invention
The invention aims to solve the problems that: provides a kilowatt-level cladding light stripper in a fiber laser,
the technical scheme provided by the invention for solving the problems is as follows: a kilowatt-level cladding light stripper in an optical fiber laser comprises a heat sink shell, a glue filling hole, an optical fiber, a micro-channel, a water inlet and a water outlet, wherein the glue filling hole is axially arranged inside the heat sink shell, the optical fiber is arranged at the center inside the glue filling hole, the micro-channel is arranged in the glue filling hole around the optical fiber, the water inlet and the water outlet are arranged at two ends of the micro-channel, the outer surface layer of the optical fiber is coated by high-refractive-index glue, and the glue filling hole is filled with the high-refractive-index glue.
Preferably, the heat sink shell is made of metal aluminum and is in a cuboid shape, and the length of the cuboid shape is 120 mm, the width of the cuboid shape is 25 mm, and the height of the cuboid shape is 25 mm.
Preferably, the glue filling hole is in a shape of a circular truncated cone, the radius of the bottom surface is 10 mm, the radius of the top surface is 5 mm, and the length is 120 mm.
Preferably, the optical fiber is 120 mm long and is etched into two sections with different thicknesses by hydrofluoric acid; the first section is a cylindrical thick-end optical fiber with the length of 60 mm and the radius of 0.156 mm; the second section is a cylindrical thin-end optical fiber with the length of 55 mm and the radius of 0.1 mm; the middle of the two optical fibers is a connecting section in a shape of a circular truncated cone, the radius of the bottom surface is 0.156 mm, the radius of the top surface is 0.1 mm, and the length is 5 mm.
Preferably, the microchannel is spiral, the axial length is 120 mm, the number of turns is 30, the radius of the outer ring is 9 mm, the radius of the flow channel is 0.5 mm, the axial pitch is 4 mm, the radial pitch is 0.2 mm, and the spiral chirality is right-handed.
Preferably, the water inlet and the water outlet have the same specification and size, are circular and have a radius of 0.5 mm.
Compared with the prior art, the invention has the advantages that: according to the cladding light stripper, firstly, the acid corrosion method and the high-refractive-index glue method are combined, so that the photothermal conversion efficiency of cladding light can be greatly improved; secondly, the cladding of the optical fiber is corroded into two sections with different thicknesses by hydrofluoric acid, so that cladding light can be more uniformly distributed in the axial direction of the optical fiber, and heat dissipation is facilitated; and finally, a micro-channel water cooling technology is adopted, so that the heat dissipation problem of the kilowatt-level cladding light stripper in the optical fiber laser can be solved, and the cooling flow channel is designed into a spiral round pipeline, so that water flow in the cooling flow channel can be more gentle, and heat energy can be uniformly taken away through the water flow.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a kilowatt-level cladding stripper in a fiber laser according to the present invention;
FIG. 2 is a graph showing the simulation of the thermal effect of the cladding light stripper of the present invention stripping 1000W of cladding light;
the attached drawings are marked as follows: 1 heat sink shell, 2 glue filling holes, 3 optical fibers, 4 micro-channels, 5 water inlets and 6 water outlets
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to implement the embodiments of the present invention by using technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
As shown in fig. 1, the kilowatt-level cladding light stripper in the fiber laser comprises a heat sink shell (1), a glue filling hole (2), an optical fiber (3), a microchannel (4), a water inlet (5) and a water outlet (6), wherein the glue filling hole (2) is arranged inside the heat sink shell (1), the optical fiber (3) is arranged at the center inside the glue filling hole (2), the microchannel (4) is arranged in the glue filling hole (2) around the optical fiber (3), and the water inlet (5) and the water outlet (6) are arranged at two ends of the microchannel (4); and the outer surface layer of the optical fiber (3) is coated with high-refractive-index glue, and the glue filling hole (2) is filled with the high-refractive-index glue.
Further, the heat sink shell is made of metal aluminum and is in a cuboid shape, and the heat sink shell is 120 mm long, 25 mm wide and 25 mm high.
Furthermore, the glue filling hole is in a shape of a circular truncated cone, the radius of the bottom surface is 10 mm, the radius of the top surface is 5 mm, and the length is 120 mm.
Furthermore, the optical fiber is 120 mm long and is etched into two sections with different thicknesses by hydrofluoric acid; the first section is a cylindrical thick-end optical fiber with the length of 60 mm and the radius of 0.156 mm; the second section is a cylindrical thin-end optical fiber with the length of 55 mm and the radius of 0.1 mm; the middle of the two optical fibers is a connecting section in a shape of a circular truncated cone, the radius of the bottom surface is 0.156 mm, the radius of the top surface is 0.1 mm, and the length is 5 mm.
Furthermore, the microchannel is spiral, the axial length is 120 mm, the number of turns is 30, the radius of the outer ring is 9 mm, the radius of the flow channel is 0.5 mm, the axial pitch is 4 mm, the radial pitch is 0.2 mm, and the spiral chirality is right-handed.
Furthermore, the water inlet and the water outlet have the same specification and size, are circular and have a radius of 0.5 mm.
The cladding light stripper disclosed by the invention has the advantages that firstly, the acid corrosion method and the high-refractive-index glue method are combined, so that the photothermal conversion efficiency of cladding light can be greatly improved; secondly, the cladding of the optical fiber is corroded into two sections with different thicknesses by hydrofluoric acid, so that cladding light can be more uniformly distributed in the axial direction of the optical fiber, and heat dissipation is facilitated; and finally, a micro-channel water cooling technology is adopted, so that the heat dissipation problem of the kilowatt-level cladding light stripper in the optical fiber laser can be solved, and the cooling flow channel is designed into a spiral round pipeline, so that water flow in the cooling flow channel can be more gentle, and heat energy can be uniformly taken away through the water flow.
The clad light stripper was subjected to a simulation experiment under conditions of a clad light of 1000 w, an ambient temperature of 293.15 k, a cooling water temperature of 288.15 k, and a water flow rate of 0.5 l/min. The simulation result of the thermal effect of the cladding light stripper is shown in fig. 2, and the data and the thermal distribution in fig. 2 are analyzed to know that: when the cladding light stripper provided by the invention is used for stripping 1000W of cladding light, the highest temperature is 297 Kelvin, the lowest temperature is 287 Kelvin, and the temperature difference is 10 Kelvin; the heat distribution throughout the stripper is very uniform; the highest temperature occurs at the water inlet and the lowest temperature occurs at the water outlet, demonstrating that most of the heat energy is dissipated by the water flow.
The principle adopted by the invention is as follows: the high-refractive-index glue method and the acid etching method are combined, total reflection of cladding light in an optical fiber inner cladding is damaged, so that the cladding light is subjected to photo-thermal conversion in the high-refractive-index glue in the glue filling hole, and heat energy is dissipated out of the cladding light stripper through water flow through a micro-channel water cooling technology.
The invention has the beneficial effects that: the invention combines a high-refractive-index glue method and an acid corrosion method, so that the photo-thermal conversion efficiency of cladding light is increased; the optical fiber is corroded into two sections with different thicknesses by hydrofluoric acid, so that cladding light can be more uniformly distributed in the axial direction of the optical fiber, and heat dissipation is facilitated; by adopting the micro-channel water cooling technology, the heat dissipation problem of the kilowatt-level cladding light stripper in the optical fiber laser is solved, and the cooling flow channel is designed into a spiral round pipeline so that the water flow in the cooling flow channel is more gentle, so that heat energy is uniformly taken away through the water flow without generating obvious hot spots.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (6)
1. A kilowatt-level cladding light stripper in a fiber laser is characterized in that: including heat sink shell (1), filler hole (2), optic fibre (3), microchannel (4), water inlet (5) and delivery port (6), filler hole (2) axial setting is in the inside of heat sink shell (1), optic fibre (3) set up fill out the inside center department in filler hole (2), microchannel (4) encircle optic fibre (3) set up fill out in the filler hole (2), water inlet (5) and delivery port (6) set up microchannel (4) both ends, the extexine of optic fibre (3) is with high refractive index glue coating, and high refractive index glue is filled up fill out filler hole (2).
2. The kilowatt-level cladding light stripper in the optical fiber laser device according to claim 1, characterized in that: the heat sink shell (1) is made of metal aluminum and is in a cuboid shape, and the heat sink shell is 120 mm long, 25 mm wide and 25 mm high.
3. The kilowatt-level cladding light stripper in the optical fiber laser device according to claim 1, characterized in that: the glue filling hole (2) is in a circular truncated cone shape, the radius of the bottom surface is 10 mm, the radius of the top surface is 5 mm, and the length is 120 mm.
4. The kilowatt-level cladding light stripper in the optical fiber laser device according to claim 1, characterized in that: the optical fiber (3) is 120 mm long and is etched into two sections with different thicknesses by hydrofluoric acid; the first section is a cylindrical thick-end optical fiber with the length of 60 mm and the radius of 0.156 mm; the second section is a cylindrical thin-end optical fiber with the length of 55 mm and the radius of 0.1 mm; the middle of the two optical fibers is a connecting section in a shape of a circular truncated cone, the radius of the bottom surface is 0.156 mm, the radius of the top surface is 0.1 mm, and the length is 5 mm.
5. The kilowatt-level cladding light stripper in the optical fiber laser device according to claim 1, characterized in that: the micro-channel (4) is spiral, the axial length is 120 mm, the number of turns is 30, the radius of the outer ring is 9 mm, the radius of the flow channel is 0.5 mm, the axial pitch is 4 mm, the radial pitch is 0.2 mm, and the spiral chirality is right-handed.
6. The kilowatt-level cladding light stripper in the optical fiber laser device according to claim 1, characterized in that: the water inlet (5) and the water outlet (6) are same in specification and size, are circular and have a radius of 0.5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910972014.2A CN110676677A (en) | 2019-10-14 | 2019-10-14 | Kilowatt-level cladding light stripper in optical fiber laser |
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| CN201910972014.2A CN110676677A (en) | 2019-10-14 | 2019-10-14 | Kilowatt-level cladding light stripper in optical fiber laser |
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| CN110676677A true CN110676677A (en) | 2020-01-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200099190A1 (en) * | 2018-09-21 | 2020-03-26 | Nlight, Inc. | Optical fiber cladding light stripper |
| US11808973B2 (en) | 2018-09-10 | 2023-11-07 | Nlight, Inc. | Optical fiber splice encapsulated by a cladding light stripper |
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| CN109672073A (en) * | 2019-02-01 | 2019-04-23 | 南昌航空大学 | A kind of optical fiber laser Cladding Power Stripper |
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2019
- 2019-10-14 CN CN201910972014.2A patent/CN110676677A/en active Pending
Patent Citations (7)
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| CN204651670U (en) * | 2015-06-12 | 2015-09-16 | 中国工程物理研究院总体工程研究所 | Adopt the multikilowatt fiber cladding power stripper of microchannel water-cooled |
| CN104991310A (en) * | 2015-07-23 | 2015-10-21 | 深圳市创鑫激光股份有限公司 | Liquid-cooled optical fiber collimator and laser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11808973B2 (en) | 2018-09-10 | 2023-11-07 | Nlight, Inc. | Optical fiber splice encapsulated by a cladding light stripper |
| US20200099190A1 (en) * | 2018-09-21 | 2020-03-26 | Nlight, Inc. | Optical fiber cladding light stripper |
| US11575239B2 (en) * | 2018-09-21 | 2023-02-07 | Nlight, Inc. | Optical fiber cladding light stripper |
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Application publication date: 20200110 |