CN108333675A - A kind of chirality coupling fibre core gain fibre and preparation method - Google Patents
A kind of chirality coupling fibre core gain fibre and preparation method Download PDFInfo
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- CN108333675A CN108333675A CN201810161271.3A CN201810161271A CN108333675A CN 108333675 A CN108333675 A CN 108333675A CN 201810161271 A CN201810161271 A CN 201810161271A CN 108333675 A CN108333675 A CN 108333675A
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- core
- fibre
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- fibre core
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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
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
- G02B6/03633—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - -
-
- 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
- G02B6/02042—Multicore optical fibres
Abstract
The invention discloses a kind of chirality coupling fibre core gain fibre and preparation methods, the optical fiber includes central core successively from inside to outside, satellite fibre core, inner cladding, surrounding layer, a diameter of a of the central core, a diameter of b of the satellite fibre core, the core spacing of the central core and satellite fibre core is d, and b<a,d<A+b, the central core, satellite fibre core, inner cladding, surrounding layer refractive index be respectively n1,n2,n3,n4And n1>n3>n4, n2>n3, the satellite fibre core is uniform pitch helical structure, and the screw pitch of the satellite fibre core is Λ, and 3mm<Λ<15mm.The optical fiber can ensure the beam quality of laser while improving output laser power, the requirement to laser or amplifier gain fiber in high-precision laser processing can be met, preparation method provided by the invention is simple and practical, can meet the needs of type optical fiber mass production.
Description
Technical field
The present invention relates to technical field of optical fiber more particularly to a kind of chirality coupling fibre core gain fibre and preparation methods.
Background technology
In the commercial Application of optical fiber laser, in order to realize higher machining accuracy, to exporting the power and light of laser
Beam quality has higher requirement, and the nonlinear effect that laser power elevator belt comes in order to prevent influences, and needs to increase core diameter
To improve fiber nonlinear effect threshold value, and the increasing of fibre core diameter inevitably introduces more higher order modes, from
And the decline of quality for outputting laser beam is caused, reduce the processing performance of laser.In order to make optical fiber have the same of larger core diameter
When remain to keep preferable beam quality, there are two ways to common, one is patterns to filter out method, i.e., by various means defeated
Outlet filters the high-order mode of optical fiber, such as draws cone technique, and another kind is the waveguide design by optical fiber, makes to pass in fibre core
Defeated low-order mode, such as photonic crystal fiber, pattern upconversion fiber, chirality couple doped core optical fiber etc..
Existing chirality coupling doped core optical fiber generally uses rod-in-tube technique or grooving method during fabrication, is prepared using rod-in-tube technique
When the optical fiber, central core prefabricated rods and satellite core preform are first put into casing, then casing is heated, and are rotated
Casing carries out wire drawing；Grooving method is and right by being combined in central core prefabricated rods cut-in groove and satellite core preform
Composite structure carries out High Temperature Rotating wire drawing to prepare optical fiber.
Rod-in-tube technique is due to there is satellite core preform between central core prefabricated rods and casing, it is difficult to fit closely, rotate
Waveguiding structure deformation is easily caused in drawing process, process repeatability is poor, and grooving method is due to satellite preform and central core
Contact area is larger at prefabricated rods separation, and prefabricated rods centrifugation whipping, technology stability are easily caused in high speed rotation drawing process
It is not high, influence the wire drawing quality of optical fiber.
Invention content
The present invention proposes a kind of chirality coupling fibre core gain fibre and preparation method, which can swash improving output
The beam quality for ensureing laser while luminous power can meet in high-precision laser processing to laser or amplifier gain fiber
Requirement, preparation method provided by the invention is simple and practical, can meet the needs of type optical fiber mass production.
The technical solution adopted by the present invention is as follows：
A kind of chirality couples fibre core gain fibre, includes central core successively from inside to outside, satellite fibre core, inner cladding,
Surrounding layer,
A diameter of a of the central core, a diameter of b of the satellite fibre core, the central core and satellite fibre core
Core spacing is d, and b<a,d<A+b, the central core, satellite fibre core, inner cladding, surrounding layer refractive index be respectively n1,n2,
n3,n4And n1>n3>n4, n2>n3, the satellite fibre core is uniform pitch helical structure, and the screw pitch of the satellite fibre core is Λ, and 3mm
<Λ<15mm。
Wherein, the central core is one or more glass materials in ytterbium aluminium and doping Ge, P, F.
Wherein, the satellite fibre core is one or more glass materials in copper or samarium and doping Ge, P, F.
Wherein, the inner cladding structure is D-shaped, rectangle, hexagon, any one of octagon.
Wherein, the inner cladding host material is quartz glass, one or more in doped chemical Ge, Al, F, P.
Wherein, the preparation of the surrounding layer is using deposition substrate material and dopant material in PCVD or MCVD pipes；
The preparation of the inner cladding is using deposition substrate material and dopant material in PCVD or MCVD pipes；
The preparation of the satellite fibre core is to use MCVD deposition substrates material and dopant material, and the MCVD preparation methods can
Using solwution method or vapour deposition process；
The preparation of the central core is to use MCVD deposition substrates material and dopant material, and the MCVD preparation methods can
Using solwution method or vapour deposition process.
A kind of preparation method being used to prepare chirality coupling fibre core gain fibre described above, including：
Step 1 prepares central core prefabricated rods and satellite core preform；
Step 2 carries out punching processing according to the size of the satellite core preform to the central core prefabricated rods,
The aperture beaten is matched with satellite core preform size；
The central core prefabricated rods after punching are assembled with satellite core preform and pass through high temperature by step 3
It is drawn into solid bar；
Step 4 carries out high speed rotation wire drawing to the solid bar and obtains required chirality coupling fibre core gain fibre.
Wherein, the central core prefabricated rods are described using deposition substrate material and dopant material in PCVD or MCVD pipes
Satellite core preform is using deposition substrate material and dopant material in PCVD or MCVD pipes.
Wherein, the drawing by high temperature temperature described in step 3 is to be less than or equal to 2200 DEG C more than or equal to 1850 DEG C.
Wherein, the rotary speed of the high speed rotation wire drawing is being less than or equal to 2000 turns more than or equal to 0 turn, the high speed rotation
Turn wire drawing drawing speed be more than or equal to 2 ms/min be less than or equal to 20 ms/min, drawing tensile force be more than or equal to 10 grams be less than etc.
In 150 grams, wire-drawing temperature is to be less than or equal to 2000 DEG C more than or equal to 1650 DEG C.
Advantageous effect：
The optical fiber unlike traditional gain fibre by introducing a kind of spiral satellite fibre core in central core side,
By designing two core sizes, distance, the parameters such as refractive index and satellite fibre core screw pitch can make the higher order mode of central core
Be coupled to side core and lose, to ensure central core basic mode transmission, thus can increase transmit laser power while,
Ensure the mode quality of output laser.The present invention proposes a kind of preparation method of the optical fiber simultaneously, and this method passes through maturation
PCVD or MCVD techniques prepare central core prefabricated rods and satellite core preform, and light is prepared by rotating drawing process online
Fibre, method simple practical, the mass for being easy to optical fiber generate.
Description of the drawings
Fig. 1 is a kind of cross-sectional view of chirality coupling fibre core gain fibre one embodiment provided by the invention.
Fig. 2 is the central core and satellite of a kind of chirality coupling fibre core gain fibre one embodiment provided by the invention
Fibre core schematic diagram.
Fig. 3 is a kind of preparation method flow chart of chirality coupling fibre core gain fibre provided by the invention.
In figure：
1- central cores；2- satellite fibre cores；3- inner claddings；4- surrounding layers.
Specific implementation mode
Technical solution of the present invention is described in detail with reference to the accompanying drawings and examples as follows：
Embodiment 1：
As shown in Figure 1, 2, a kind of chirality provided by the invention couples fibre core gain fibre, includes successively from inside to outside
Central core 1, satellite fibre core 2, inner cladding 3, surrounding layer 4,
A diameter of a of the central core 1, a diameter of b of the satellite fibre core 2, the central core 1 and satellite fibre core
2 core spacing is d, and b<a,d<A+b, the central core 1, satellite fibre core 2, inner cladding 3, surrounding layer 4 refractive index difference
For n1,n2,n3,n4And n1>n3>n4, n2>n3, the satellite fibre core 2 is uniform pitch helical structure, the screw pitch of the satellite fibre core 2
For Λ, and 3mm<Λ<15mm.
In the present embodiment, the central core 1 is one or more glass materials in ytterbium aluminium and doping Ge, P, F.
The purpose of ytterbium aluminium doping is the attraction efficiency for improving central core 1 to pump light.
In the present embodiment, the satellite fibre core 2 is one or more glass materials in copper or samarium and doping Ge, P, F
Material.
In the present embodiment, 3 structure of the inner cladding is D-shaped, rectangle, hexagon, in the non-circular structures such as octagon
It is any.Non-circular structure is the propagation for destroying the spiral light in inner cladding 3, absorption efficiency of the enhancing central core 1 to pump light.
In the present embodiment, 3 host material of the inner cladding is quartz glass, one in doped chemical Ge, Al, F, P
Kind is a variety of.The refractive index for acting as improving inner cladding 3 of Ge, Al, F, P, are conducive to the numerical aperture for reducing optical fiber.
In the present embodiment, the preparation of the surrounding layer 4 is using deposition substrate material and doping in PCVD or MCVD pipes
Material.
The preparation of the inner cladding 3 is using deposition substrate material and dopant material in PCVD or MCVD pipes.
The preparation of the satellite fibre core 2 is to use MCVD deposition substrates material and dopant material, the MCVD preparation methods
Solwution method or vapour deposition process can be used.
The preparation of the central core 1 is to use MCVD deposition substrates material and dopant material, the MCVD preparation methods
Solwution method or vapour deposition process can be used.
Embodiment as one preferred：Chirality couples fibre core gain fibre, the diameter of central core 1, satellite fibre core 2
Diameter, diameter of a circle is inscribed in inner cladding 3, and the diameter of surrounding layer 4 is respectively 30 μm, 17 μm, 400 μm, 450 μm.Central core 1
It it is 28 μm with the core spacing of satellite fibre core 2, the screw pitch of satellite fibre core 2 is 10mm, central core 1, satellite fibre core 2, inner cladding 3
Refractive index is respectively 1.4512,1.4536,1.4497.
The present embodiment preparation process is：Using deposition ytterbium, aluminium, germanium, phosphorus plasma and quartz substrate in PCVD or MCVD pipes
Central core prefabricated rods are prepared, using copper is deposited in PCVD or MCVD pipes, samarium, germanium, aluminium, phosphorus plasma and quartz substrate preparation are defended
Star core preform carries out punching processing, by satellite fibre core according to the size of satellite core preform to central core preform
Prefabricated rods are inserted in central core prefabricated rods hole and are drawn into solid bar at 2000 DEG C, and solid bar is fixed on rotary chuck,
Rotary speed 1000r/min, drawing speed 10m/min are set, and 1850 DEG C of wire-drawing temperature generates required chirality coupling fibre core
Gain fibre.
Verified, chirality provided by the present invention coupling fibre core gain fibre slope efficiency is 50% or more, light beam matter
The factor 1.18 is measured, display output laser has preferable mode quality.
Embodiment 2：
The present embodiment belongs to embodiment of the method, and above-described embodiment 1 belongs to constructive embodiment, in the present embodiment and above-mentioned implementation
Example belongs to same technical concept, and the content of not detailed description, refers to above-described embodiment 1 in the present embodiment.
As shown in figure 3, a kind of preparation method of chirality coupling fibre core gain fibre of the present invention, including：
Step 1 prepares central core prefabricated rods and satellite core preform.
Step 2 carries out punching processing according to the size of the satellite core preform to the central core prefabricated rods,
The aperture beaten is matched with satellite core preform size；The punching of central core prefabricated rods uses a kind of high-precision punching vehicle
Bed carries out central core preform to be accurately positioned punching, needs to carry out the post-processing such as edible vegetable oil after punching to ensure the bright and clean of through-hole.
The central core prefabricated rods after punching are assembled with satellite core preform and pass through high temperature by step 3
It is drawn into solid bar.
Step 4 carries out high speed rotation wire drawing to the solid bar and obtains required chirality coupling fibre core gain fibre.
In the present embodiment, the central core prefabricated rods are using deposition substrate material in PCVD or MCVD pipes and doping material
Material, the satellite core preform is using deposition substrate material and dopant material in PCVD or MCVD pipes.
In the present embodiment, the drawing by high temperature temperature described in step 3 is to be less than or equal to 2200 DEG C more than or equal to 1850 DEG C,
Tensile speed is more than or equal to 5mm/min and is less than or equal to 20mm/min.
In the present embodiment, the high speed rotation wire drawing is a kind of online rotation drawing process, in the mistake of prefabricated stick drawn wire
The rotary speed for obtaining prefabricated rods in journey by the high speed rotation of rotary chuck, passes through the design of fiber drawing furnace and the control of draw parameters
System ensures the stability of wire drawing, and the rotary speed is being less than or equal to 2000 turns more than or equal to 0 turn, the drawing speed be more than
Equal to 2 ms/min be less than or equal to 20 ms/min, drawing tensile force be more than or equal to 10 grams be less than or equal to 150 grams, wire-drawing temperature be more than
It is less than or equal to 2000 DEG C equal to 1650 DEG C.
The rotary speed V of screw pitch Λ setting prefabricated rods needed for satellite fibre core1With drawing speed V2
Λ=V2/V1。
As another preferred embodiment：Chirality couples fibre core gain fibre, the diameter of central core 1, satellite fibre
Diameter of a circle is inscribed in the diameter of core 2, inner cladding 3, and the diameter of surrounding layer 4 is respectively 28 μm, 15 μm, 400 μm, 450 μm.It is central fine
The core spacing of core 1 and satellite fibre core 2 is 26 μm, and the screw pitch of satellite fibre core is 8mm, central core 1, satellite fibre core 2, inner cladding 3
Refractive index be respectively 1.5261,1.5282,1.5247.
The present embodiment preparation process is：Using deposition ytterbium, aluminium, germanium, phosphorus plasma and quartz substrate in PCVD or MCVD pipes
Sino-British core preform is prepared, using depositing copper in PCVD or MCVD pipes, samarium, germanium, aluminium, phosphonium ion and quartz substrate preparation are defended
Star core preform carries out punching processing, by satellite fibre core according to the size of satellite core preform to central core preform
Prefabricated rods are inserted in central core prefabricated rods hole and are drawn into solid bar at 2010 DEG C, and solid bar is fixed on rotary chuck,
Rotary speed 1250r/min, drawing speed 10m/min are set, and 1900 DEG C of wire-drawing temperature generates required chirality coupling fibre core
Gain fibre.
Verified, chirality provided by the present invention couples fibre core gain fibre slope efficiency in 50% or more, the M2 factors
1.16, display output laser has preferable mode quality.
The present invention couples fibre core gain fibre and preparation method thereof as a kind of chirality and a kind of large mode field list may be implemented
The preparation of mode fiber, the optical fiber can keep laser high power defeated in optical fiber laser and amplifier as a kind of gain fibre
Have preferable mode quality while going out, and then plays an important role in high-precision material processing field.
Although the present invention detailed example and has described relevant specific embodiment and has made reference, to the technology of this field
For personnel, after reading and understanding the description and the appended drawings, made in thought and range without departing substantially from the present invention various
Change.These changes fall within the protection domain required by the claim of the present invention.
Claims (10)
1. a kind of chirality couples fibre core gain fibre, which is characterized in that include central core (1), satellite successively from inside to outside
Fibre core (2), inner cladding (3), surrounding layer (4),
A diameter of a of the central core (1), a diameter of b of the satellite fibre core (2), the central core (1) are fine with satellite
The core spacing of core (2) is d, and b<a,d<A+b, the central core (1), satellite fibre core (2), inner cladding (3), surrounding layer (4)
Refractive index be respectively n1,n2,n3,n4And n1>n3>n4, n2>n3, the satellite fibre core (2) is uniform pitch helical structure, described to defend
The screw pitch of star fibre core (2) is Λ, and 3mm<Λ<15mm.
2. a kind of chirality according to claim 1 couples fibre core gain fibre, which is characterized in that the central core
(1) it is ytterbium aluminium and adulterates Ge, one or more glass materials in P, F.
3. a kind of chirality according to claim 1 couples fibre core gain fibre, which is characterized in that the satellite fibre core
(2) it is copper or samarium and adulterates Ge, one or more glass materials in P, F.
4. a kind of chirality according to claim 1 couples fibre core gain fibre, which is characterized in that the inner cladding (3)
Structure is D-shaped, rectangle, hexagon, any one of octagon.
5. a kind of chirality according to claim 1 couples fibre core gain fibre, which is characterized in that the inner cladding (3)
Host material is quartz glass, one or more in doped chemical Ge, Al, F, P.
6. a kind of chirality according to claim 1 couples fibre core gain fibre, which is characterized in that the surrounding layer (4)
Preparation be using deposition substrate material and dopant material in PCVD or MCVD pipes；
The preparation of the inner cladding (3) is using deposition substrate material and dopant material in PCVD or MCVD pipes；
The preparation of the satellite fibre core (2) is to use MCVD deposition substrates material and dopant material, and the MCVD preparation methods can
Using solwution method or vapour deposition process；
The preparation of the central core (1) is to use MCVD deposition substrates material and dopant material, and the MCVD preparation methods can
Using solwution method or vapour deposition process.
7. a kind of preparation method being used to prepare claim 1-6 any one of them chiralities coupling fibre core gain fibre,
It is characterized in that, including：
Step 1 prepares central core prefabricated rods and satellite core preform；
Step 2 carries out punching processing to the central core prefabricated rods according to the size of the satellite core preform, beats
Aperture matched with satellite core preform size；
The central core prefabricated rods after punching are assembled with satellite core preform and pass through drawing by high temperature by step 3
At solid bar；
Step 4 carries out high speed rotation wire drawing to the solid bar and obtains required chirality coupling fibre core gain fibre.
8. a kind of preparation method of chirality coupling fibre core gain fibre according to claim 7, which is characterized in that described
Central core prefabricated rods are used using deposition substrate material and dopant material in PCVD or MCVD pipes, the satellite core preform
Deposition substrate material and dopant material in PCVD or MCVD pipes.
9. a kind of preparation method of chirality coupling fibre core gain fibre according to claim 7, which is characterized in that step
Drawing by high temperature temperature described in three is to be less than or equal to 2200 DEG C more than or equal to 1850 DEG C.
10. a kind of preparation method of chirality coupling fibre core gain fibre according to claim 7, which is characterized in that institute
The rotary speed for stating high speed rotation wire drawing is to be less than or equal to 2000 turns more than or equal to 0 turn, the wire drawing speed of the high speed rotation wire drawing
Degree is is less than or equal to 20 ms/min more than or equal to 2 ms/min, and drawing tensile force is to be less than or equal to 150 grams more than or equal to 10 grams, wire drawing temperature
Degree is to be less than or equal to 2000 DEG C more than or equal to 1650 DEG C.
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| CN201810161271.3A CN108333675A (en) | 2018-02-27 | 2018-02-27 | A kind of chirality coupling fibre core gain fibre and preparation method |
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| CN201810161271.3A CN108333675A (en) | 2018-02-27 | 2018-02-27 | A kind of chirality coupling fibre core gain fibre and preparation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113466989A (en) * | 2021-07-06 | 2021-10-01 | 中天科技精密材料有限公司 | Chiral coupling fiber core optical fiber and preparation method thereof |
| CN114355505A (en) * | 2021-12-31 | 2022-04-15 | 长飞光纤光缆股份有限公司 | Laser shaping optical fiber, and preparation method and application thereof |
| CN114421266A (en) * | 2021-12-22 | 2022-04-29 | 中国人民解放军93236部队 | Side pumping beam combiner based on chiral coupling fiber core optical fiber and manufacturing method |
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| CN114421266A (en) * | 2021-12-22 | 2022-04-29 | 中国人民解放军93236部队 | Side pumping beam combiner based on chiral coupling fiber core optical fiber and manufacturing method |
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Application publication date: 20180727 |