CN109061796A - A kind of cladding mode filtering device of doubly clad optical fiber - Google Patents
A kind of cladding mode filtering device of doubly clad optical fiber Download PDFInfo
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- CN109061796A CN109061796A CN201811145120.5A CN201811145120A CN109061796A CN 109061796 A CN109061796 A CN 109061796A CN 201811145120 A CN201811145120 A CN 201811145120A CN 109061796 A CN109061796 A CN 109061796A
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- optical fiber
- quartz
- doubly clad
- heat sink
- clad optical
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
-
- 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
-
- 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
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Lasers (AREA)
Abstract
A kind of cladding mode filtering device of doubly clad optical fiber is related to laser technology field, which includes: heat sink pedestal, the identical quartz pushrod of different in size and cross-sectional area, quartz ampoule, liquid metal and heat sink cover board；The outer surface circumference uniform distribution of the inner cladding of doubly clad optical fiber is from being short to long quartz pushrod, and the quartz pushrod of equal length is with the distribution substantially symmetrical about its central axis of optical fiber；The end face of all quartz pushrods is located in same level with the end face that fibre core goes out light end and the refractive index of inner cladding, quartz pushrod and quartz ampoule is equal or is gradually incremented by；Doubly clad optical fiber and all quartz pushrods are placed in quartz ampoule, and quartz ampoule is placed in the optical fiber duct of heat sink pedestal, and optical fiber duct is full fully wrapped around by quartz ampoule by liquid metal filling, are covered on heat sink pedestal and are sealed by heat sink cover board.The present invention is suitable for high-power operation, and can improve quality for outputting laser beam, avoid cladding mode concentrate leakage and caused by local temperature it is excessively high, guarantee device can operate normally safely.
Description
Technical field
The present invention relates to laser technology fields, more particularly to a kind of cladding mode filtering device of doubly clad optical fiber.
Background technique
Optical fiber laser have low good beam quality, perfect heat-dissipating, high reliablity, maintenance cost, optical fiber flexible transfer,
The features such as operating cost is low is widely applied in fields such as industrial processes, defense military, medical treatment.The increasing of optical fiber laser
Beneficial medium is the doubly clad optical fiber mixed with rare earth ion, and the structure of doubly clad optical fiber includes fibre core, inner cladding, surrounding layer and coating
Layer, surrounding layer and coat are made of same substance sometimes, while having the function of surrounding layer and coat.It is usually mixed in fibre core
Miscellaneous to have rare earth ion, the refractive index of fibre core, inner cladding and surrounding layer successively reduces.Lasing light passes in the fibre core of doubly clad optical fiber
Defeated, pump light then transmits in the inner cladding of doubly clad optical fiber, during pump light transmits in inner cladding, constantly by fine
Core absorbs and is formed population inversion by the rare earth ion in fibre core, in this way, the doubly clad optical fiber pumped just is provided with to be formed
Laser or the ability for amplifying laser.The inner cladding area of doubly clad optical fiber is much larger than core area, can couple more pumpings
Light, to realize the high-power output of optical fiber laser.But the rare earth that the pump light in inner cladding can't be adulterated in fibre core
Ion fully absorbs, and has some residual pump light.Higher order mode laser in fibre core can also be coupled in inner cladding, thus
Make the cladding mode for thering is residual pump light and higher order mode laser to constitute in inner cladding.After cladding mode in inner cladding can make
Continuous device damage, makes optical fiber laser that can not work, it is therefore necessary to effectively be filtered out to cladding mode.
Common cladding mode filtering method is to remove the surrounding layer of doubly clad optical fiber and coat, with high refractive index
UV solidification glue is outer (patent: a kind of covering optical power stripping means of doubly clad optical fiber, CN103926650A) coated in inner cladding,
Cladding mode can be exported from inner cladding by high refractive index UV solidification glue.But high refractive index UV solidification glue has cladding mode
Very strong absorption causes coating area temperature excessively high, damages device performance severe weakness even.Cladding mode can removed simultaneously
The front end of device is revealed rapidly, is made the UV glue extreme temperatures of front end, is easily damaged.And the thermal expansion coefficient of UV glue and silica fibre
Difference generates optical fiber after temperature raising micro-bend, forms more mode leakages.This method can not be stripped more than 200W's
Cladding mode.Another method is to form micro-structure by Mechanical lithography or the method for chemical attack on optical fiber inner cladding surface,
So that cladding mode is gone out from microstructures scatters, and achievees the effect that filter out a kind of (patent: covering function removing higher order mode laser
Rate stripper and production method, CN106405737A).But this method destroys inner cladding structure, makes the mechanical performance of optical fiber
Decline, is easily damaged.
Summary of the invention
In order to solve the problems in the existing technology, the present invention provides a kind of cladding modes of doubly clad optical fiber to filter out
Device leaks cladding mode gradually by the incremental arrangement of quartz pushrod, and the temperature rise of whole device is identical, and there is no some temperature
Spend high situation.
The technical proposal for solving the technical problem of the invention is as follows:
A kind of cladding mode filtering device of doubly clad optical fiber, the device include: heat sink pedestal, different in size and cross section
The identical quartz pushrod of product, quartz ampoule, liquid metal and heat sink cover board；The outer surface circumference uniform distribution of the inner cladding of doubly clad optical fiber from
It is short to long quartz pushrod, and the quartz pushrod of equal length is with the distribution substantially symmetrical about its central axis of optical fiber；Described all quartz pushrod one end
End face and the doubly clad optical fiber go out the end face at light end and be located in same level and the inner cladding, quartz pushrod and quartz ampoule
Refractive index it is equal or be gradually incremented by；Fibre core, inner cladding and all quartz pushrods of the doubly clad optical fiber are placed in quartz ampoule,
The quartz ampoule is placed in the optical fiber duct of the heat sink pedestal, and optical fiber duct is full complete by the quartz ampoule by liquid metal filling
Full package, is covered on heat sink pedestal by heat sink cover board and is sealed.
Preferably, which further includes the optical fiber fixing groove being arranged in the heat sink pedestal, positioned at quartz ampoule both ends；It is described
The shape of optical fiber fixing groove and optical fiber duct is the symmetrical structures such as cuboid, semicylinder or semiellipse cylinder, and the optical fiber is fixed
The cross sectional dimensions of slot is greater than the cross sectional dimensions of optical fiber duct.
Preferably, the method heated by arc discharge or laser, by inner cladding and quartz pushrod and quartz pushrod and quartz ampoule
It is glued and fixes.
Preferably, the diameter of the quartz pushrod is less than or equal to the diameter of doubly clad optical fiber inner cladding.
Preferably, the excircle of the quartz pushrod and quartz ampoule excircle are tangent.
Preferably, the liquid metal is one or two kinds of mixtures of mercury, gallium indium tin kirsite liquid metal.
The beneficial effects of the present invention are: the present invention effectively filters out doubly clad optical fiber in such a way that cladding mode gradually leaks out
Cladding mode in inner cladding can work under high power conditions, and improve the beam quality of output laser.Interior packet is not damaged
Layer surface, and pass through the incremental arrangement of quartz pushrod, it leaks cladding mode gradually, avoids cladding mode and concentrate leakage and make
At local temperature it is excessively high, the temperature rise of whole device is identical, there is no the situation that some temperature are excessively high, guarantees that device can be safe
It operates normally.Cladding mode is transmitted using quartz pushrod and quartz ampoule, since quartz pushrod and quartz ampoule are identical as inner wrap material, heat
The coefficient of expansion is identical, will not exist as thermal expansion coefficient is different and caused by fiber microbending loss.And outside quartz ampoule,
By liquid metal as light absorption and Heat Conduction Material, UV glue is compared to better capacity of heat transmission.
Detailed description of the invention
A kind of cladding mode filtering device schematic diagram of doubly clad optical fiber of Fig. 1 present invention.
The sectional view of the existing doubly clad optical fiber of Fig. 2.
A kind of cladding mode filtering device doubly clad optical fiber of doubly clad optical fiber of Fig. 3 present invention, quartz pushrod and quartz ampoule are whole
The side view of body structure.
A kind of cladding mode filtering device of doubly clad optical fiber of Fig. 4 present invention is placed in optical fiber duct to be covered by liquid metal
Doubly clad optical fiber, quartz pushrod and quartz ampoule structure cross-sectional view.
In figure: 1, heat sink pedestal, 11, optical fiber fixing groove, 12, optical fiber duct, 2, doubly clad optical fiber, 21, fibre core, 22, interior packet
Layer, 23, surrounding layer, 24, coat, 3, quartz pushrod, 31, long quartz pushrod, 32, middle quartz pushrod, 33, short quartz pushrod, 4, quartz ampoule,
5, liquid metal, 6, heat sink cover board.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
As Figure 1-Figure 4, the cladding mode filtering device of a kind of doubly clad optical fiber, the device include: heat sink pedestal 1,
The identical quartz pushrod 3 of short and cross-sectional area, quartz ampoule 4, liquid metal 5 and heat sink cover board 6 in length；It is machined on heat sink pedestal 1
The shape of optical fiber fixing groove 11 and optical fiber duct 12, optical fiber fixing groove 11 and optical fiber duct 12 can be cuboid, semicylinder or half
The symmetrical structures such as Elliptic Cylinder, for preferably fixed and carrying doubly clad optical fiber 2；The cross sectional dimensions of optical fiber fixing groove 11 is big
In the cross sectional dimensions of optical fiber duct 12, doubly clad optical fiber 2 is made to have redundancy in optical fiber fixing groove 11.As shown in Fig. 2, double clad light
Fibre 2 includes fibre core 21, inner cladding 22, surrounding layer 23, overlay 24.The middle section of doubly clad optical fiber 2 is stripped into surrounding layer
23 and coat 24,3 circumference uniform distribution of quartz pushrod abutting is placed on around inner cladding 22, the refractive index of quartz pushrod 3 is greater than etc.
In the refractive index of inner cladding 22, the quantity for being emitted on the quartz pushrod 3 around inner cladding 22 is even number, the end of all quartz pushrods 3
The end face that face and the fibre core 21 go out light end is located in same level.As shown in figure 3, long quartz pushrod 31, middle quartz pushrod 32, short
The length of quartz pushrod 33 is successively successively decreased, the rule of 22 circumference uniform distribution quartz pushrod 3 of inner cladding be long quartz pushrod 31, middle quartz pushrod 32,
Short quartz pushrod 33, middle quartz pushrod 32, long quartz pushrod 31, middle quartz pushrod 32, short quartz pushrod 33, middle quartz pushrod 32, long quartz pushrod
31 ... long quartz pushrods 31, middle quartz pushrod 32, short quartz pushrod 33 are respectively with the distribution substantially symmetrical about its central axis of inner cladding 22, all quartz
Pipe 3 is close to be emitted on around inner cladding 22 in parallel, since 3 quantity of quartz pushrod being close to inner cladding 22 is incremented by successively,
Cladding mode in inner cladding 22 is gradually leaked out through quartz pushrod, can avoid partial envelope mold leakage it is excessive and caused by temperature rise.
Cross section that long quartz pushrod 31, middle quartz pushrod 32, short quartz pushrod 33 arrange in inner cladding 22 as shown in figure 4, quartz pushrod 3 it is straight
Diameter is less than or equal to 22 diameter of inner cladding, and after the diameter for determining inner cladding 22, the number of quartz pushrod 3 is according to the big of 3 diameter of quartz pushrod
It is small to increase or decrease, but its arrangement regulation meets Fig. 3 and rule shown in Fig. 4.The inner cladding 22 for arranging quartz pushrod 3 is put
It sets in quartz ampoule 4,4 length of quartz ampoule is identical as 22 length of inner cladding for stripping surrounding layer 23 and coat 24.Pass through electricity
The modes such as arc discharge or laser heating, by the contact point sticky of inner cladding 22 and the contact point of quartz pushrod 3, quartz pushrod 3 and quartz ampoule 4
It is connected to together.The quartz ampoule 4 of internal setting inner cladding 22 and quartz pushrod 3 is then put into togerther the optical fiber duct on heat sink pedestal 1
In 12, and doubly clad optical fiber 2 is fixed in pedestal optical fiber fixing groove 11 with uv-curable glue；Liquid is filled in optical fiber duct 12
Quartz ampoule 4 is completely covered in metal 5, liquid metals 5.Inner cladding 22, quartz pushrod 3 are equal with the refractive index of quartz ampoule 4 or gradually pass
Increase, the refractive index of liquid metal 5 is greater than the refractive index of quartz ampoule 4, therefore the cladding mode in inner cladding 22 is through quartz pushrod 3, stone
English pipe 4 leaks into liquid metal 5, and liquid metal 5 plays cladding mode and the thermally conductive effect of absorbing, and last heat sink cover board 6 covers
It covers on heat sink pedestal 1.
Embodiment 1
The inner cladding diameter of doubly clad optical fiber 2 is 400 μm, has stripped surrounding layer 23 and coat 24, stripping length is
10cm.By length be 10cm long quartz pushrod 31, length be 7.5cm middle quartz pushrod 32 and length be 5cm short quartz pushrod 33,
It is evenly arranged on around inner cladding 22 by construction circumference shown in Fig. 3 and Fig. 4, quartz pushrod diameter is 97 μm.It is more than or equal to 596 μ with internal diameter
M, the quartz ampoule 4 of 200 μm of wall thickness, length 10cm by inner cladding 22 and the package of quartz pushrod 3 wherein, heated with carbon dioxide laser in
Covering 22, quartz pushrod 3 and quartz ampoule 4 make the contact point of inner cladding 22 and quartz pushrod 3, the contact point of quartz pushrod 3 and quartz ampoule 4
Melted by heating is bonded together.Inner cladding 22, quartz pushrod 3 and quartz ampoule 4 are put into the optical fiber duct 12 on heat sink pedestal 1, it is double
Cladded-fiber 2 is suspended in pedestal optical fiber fixing groove 11, and doubly clad optical fiber 2 is fixed on optical fiber fixing groove 11 with uv-curable glue
In.Optical fiber duct 12 is filled with 5 mercury of liquid metal, quartz ampoule 4 is completely submerged in liquid mercury.Heat sink cover board 6 is covered on heat
It sinks to the bottom on seat 1.
The refractive index of inner cladding 22, quartz pushrod 3 and quartz ampoule 4 is 1.46, and liquid mercury refractive index is 1.61, in inner cladding
Cladding mode can leak into liquid mercury through quartz pushrod 3, quartz ampoule 4, and liquid mercury absorbs cladding mode, and can will generate heat
It is conducted by heat sink pedestal 1 and heat sink cover board 6.
Embodiment 2
The present embodiment is identical as the structure of embodiment 1, except that the liquid metal 5 is gallium indium red brass, folding
Rate is penetrated greater than 1.46.
The embodiment of the above is merely used to help understand method and core concept of the invention, not limits this with this
The practical range of invention.Therefore all principles according to the present invention, change made by shape, should all cover protection scope of the present invention it
It is interior.
Claims (6)
1. a kind of cladding mode filtering device of doubly clad optical fiber, which is characterized in that the device include: heat sink pedestal, length not
One and the identical quartz pushrod of cross-sectional area, quartz ampoule, liquid metal and heat sink cover board；The outer surface of the inner cladding of doubly clad optical fiber
Circumference uniform distribution is from being short to long quartz pushrod, and the quartz pushrod of equal length is with the distribution substantially symmetrical about its central axis of optical fiber；It is described all
The end face that the end face of quartz pushrod one end and the doubly clad optical fiber go out light end is located in same level and the inner cladding, quartz
The refractive index of stick and quartz ampoule is equal or is gradually incremented by；The fibre core of the doubly clad optical fiber, inner cladding and all quartz pushrods are put
It sets in quartz ampoule, the quartz ampoule is placed in the optical fiber duct of the heat sink pedestal, and optical fiber duct is filled full by liquid metal
The quartz ampoule is fully wrapped around, it is covered on heat sink pedestal and is sealed by heat sink cover board.
2. a kind of cladding mode filtering device of doubly clad optical fiber according to claim 1, which is characterized in that the device is also
Including the optical fiber fixing groove in the heat sink pedestal, positioned at quartz ampoule both ends is arranged；The shape of the optical fiber fixing groove and optical fiber duct
Shape is the symmetrical structures such as cuboid, semicylinder or semiellipse cylinder, and the cross sectional dimensions of the optical fiber fixing groove is greater than optical fiber
The cross sectional dimensions of slot.
3. a kind of cladding mode filtering device of doubly clad optical fiber according to claim 1, which is characterized in that pass through electric arc
Inner cladding and quartz pushrod and quartz pushrod and quartz ampoule are glued and fix by the method for electric discharge or laser heating.
4. a kind of cladding mode filtering device of doubly clad optical fiber according to claim 1, which is characterized in that the quartz
The diameter of stick is less than or equal to the diameter of doubly clad optical fiber inner cladding.
5. a kind of cladding mode filtering device of doubly clad optical fiber according to claim 1, which is characterized in that the quartz
The excircle and quartz ampoule excircle of stick are tangent.
6. a kind of cladding mode filtering device of doubly clad optical fiber according to claim 1, which is characterized in that the liquid
Metal is one or two kinds of mixtures of mercury, gallium indium tin kirsite liquid metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811145120.5A CN109061796B (en) | 2018-09-29 | 2018-09-29 | Cladding mode filtering device of double-cladding optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811145120.5A CN109061796B (en) | 2018-09-29 | 2018-09-29 | Cladding mode filtering device of double-cladding optical fiber |
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| Publication Number | Publication Date |
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| CN109061796A true CN109061796A (en) | 2018-12-21 |
| CN109061796B CN109061796B (en) | 2020-08-04 |
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| CN201811145120.5A Active CN109061796B (en) | 2018-09-29 | 2018-09-29 | Cladding mode filtering device of double-cladding optical fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117111204A (en) * | 2023-10-24 | 2023-11-24 | 中国工程物理研究院激光聚变研究中心 | Optical fiber, cladding power stripper and optical fiber laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003083546A1 (en) * | 2002-03-29 | 2003-10-09 | Mitsubishi Cable Industries, Ltd. | Optical fiber core |
| CN103257399A (en) * | 2013-04-26 | 2013-08-21 | 中国人民解放军国防科学技术大学 | Device used for fiber laser and capable of filtering out cladding light |
| CN103269010A (en) * | 2013-05-10 | 2013-08-28 | 上海飞博激光科技有限公司 | Cladding light filtering structure and manufacturing method thereof |
| CN108336635A (en) * | 2018-01-22 | 2018-07-27 | 北京凯普林光电科技股份有限公司 | A kind of high power cladding light stripper |
-
2018
- 2018-09-29 CN CN201811145120.5A patent/CN109061796B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003083546A1 (en) * | 2002-03-29 | 2003-10-09 | Mitsubishi Cable Industries, Ltd. | Optical fiber core |
| CN103257399A (en) * | 2013-04-26 | 2013-08-21 | 中国人民解放军国防科学技术大学 | Device used for fiber laser and capable of filtering out cladding light |
| CN103269010A (en) * | 2013-05-10 | 2013-08-28 | 上海飞博激光科技有限公司 | Cladding light filtering structure and manufacturing method thereof |
| CN108336635A (en) * | 2018-01-22 | 2018-07-27 | 北京凯普林光电科技股份有限公司 | A kind of high power cladding light stripper |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117111204A (en) * | 2023-10-24 | 2023-11-24 | 中国工程物理研究院激光聚变研究中心 | Optical fiber, cladding power stripper and optical fiber laser |
| CN117111204B (en) * | 2023-10-24 | 2024-03-19 | 中国工程物理研究院激光聚变研究中心 | Optical fiber, cladding power stripper and optical fiber laser |
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| CN109061796B (en) | 2020-08-04 |
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Inventor after: Wang Ji Inventor after: Wang Guozheng Inventor before: Wang Guozheng Inventor before: Wang Ji |