CN104330848B - A kind of high mould field dutycycle optic fiber power beam combiner - Google Patents
A kind of high mould field dutycycle optic fiber power beam combiner Download PDFInfo
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- CN104330848B CN104330848B CN201410686102.3A CN201410686102A CN104330848B CN 104330848 B CN104330848 B CN 104330848B CN 201410686102 A CN201410686102 A CN 201410686102A CN 104330848 B CN104330848 B CN 104330848B
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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
- G02B6/24—Coupling light guides
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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
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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
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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
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
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- Optics & Photonics (AREA)
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Abstract
The invention discloses a kind of high mould field dutycycle optic fiber power beam combiner, it is therefore an objective to solves existing scheme complex process, and manufacture difficulty is big, the low problem of mould field dutycycle.The present invention includes n roots input optical fibre, an optical-fiber bundling portion and an output optical fibre；Optical-fiber bundling portion one end is connected with n root input optical fibres, and the other end is connected with output optical fibre；Optical-fiber bundling portion is that the optical fiber formed by n roots optical fiber through fused biconical taper draws cone-beam, and n roots optical fiber and the n root input optical fibres in optical-fiber bundling portion have identical covering and core diameter and identical arrangement mode, and are directed at connection with the fibre core of input optical fibre；Optical-fiber bundling portion is gradually reduced from many input optical fibre connection ends to output optical fibre connection end, forms approximate cone-shape structure, fibre core and cross sectional dimensions also reduce therewith；The output optical fibre connection end in optical-fiber bundling portion is directed at welding with the fibre core of output optical fibre.The present invention is synthesized in fibre core dutycycle without the light beam that high mould field dutycycle is realized under conditions of dramatically increasing.
Description
Technical field
The present invention relates to field of laser device technology.More particularly to one kind has high conjunction Shu Nengli and high light beam quality and system concurrently
Make the simple high mould field dutycycle optic fiber power beam combiner of technique.
Background technology
The features such as optical fiber laser has light weight, compact conformation, long lifespan, good beam quality, strong antijamming capability,
The fields such as communication, sensing, machining, medical treatment, scientific research and national defense and military have a wide range of applications.In particular with recent years
Optical fiber laser power level is developed rapidly, and the application of optical fiber laser is also constantly being expanded, concerned degree
More and more higher.Although the power level of optical fiber laser has the development advanced by leaps and bounds, 10kW magnitudes have been reached, it is single
The further lifting of the power level of optical fiber laser still has limiting for the factors such as brightness, the nonlinear effect by pump light source.
And optic fiber power beam combiner is expected to provide a kind of effective solution to break through this power limit.
Optic fiber power beam combiner is a kind of optical fibre device synthesized for light beam, and its effect is will to be transmitted in multiple optical fiber
Light beam is merged into the fibre core of same output optical fibre.In high-capacity optical fiber laser, the application master of optic fiber power beam combiner
It is embodied in two aspects：One is that the output beam of multiple high-capacity optical fiber lasers is merged into an output optical fibre, from
And realize the lifting of gross output；Two be that the optical fiber laser of multiple mid powers, high light beam quality is carried out into light beam synthesis
As the cascaded pump source of high-capacity optical fiber laser, so as to realize the pump light source of high brightness.
Application based on optic fiber power beam combiner, two aspects of performance major embodiment of optic fiber power beam combiner：One is to close
Shu Nengli, i.e., will make light beam coupling as much as possible into the fibre core of output optical fibre；Two be the beam quality of light beam after synthesis,
Under equal-wattage level conditions, the higher the better for beam quality.Lift the performance of optic fiber power beam combiner, an important means
Exactly increase the mould field dutycycle of bundling device, mould field dutycycle refers to closing each light beam mode field diameter of beam position and two phases
Adjacent beam center ratio of distances constant, if light beam constrains in transmission in fibre core, (i.e. the energy major constraints of light beam are passed in fibre core
It is defeated), then mould field dutycycle is approximately equal to fibre core dutycycle (core diameter core centre ratio of distances constant adjacent with two).Mould field is accounted for
It is empty than higher, the conjunction Shu Nengli of bundling device is stronger, and for the output optical fibre fibre core of formed objects, the light beam that can be coupled into is got over
It is many；Meanwhile, mould field dutycycle is higher, is more conducive to exciting for low step mode in output optical fibre, so as to be conducive to beam quality
Lifting.
Existing optical-fiber bundling device is built on the basis of the transmission of light beam fibre core, therefore is come for these bundling devices
Say, mould field dutycycle is determined by fibre core dutycycle, such as patent of invention signal light combiner and preparation method thereof (publication number
CN101866032A), the invention by fused biconical taper mode, by multiple light beam couplings into same fibre core；But, due to
Draw cone process to be obviously improved fibre core dutycycle, also can not just be obviously improved the mould field dutycycle of bundling device.In order to lift conjunction
The mould field dutycycle of beam device, patent of invention optic fiber power beam combiner and preparation method thereof (publication number CN102116902A) and invention
Patent high beam quality signal light fiber beam combiner and preparation method thereof (publication number CN102778729A) provides two schemes,
Two schemes employ the mode of chemical attack and mechanical lapping to reduce the size of optical fiber inner cladding, improve fibre core duty
Than, so that mould field dutycycle is improved, but this method can only make the lifting of mould field dutycycle to 0.5, and the dutycycle is still not enough to full
The requirement of sufficient beam quality optimization.In order to further lift mould field dutycycle, the latter proposes using the method for adding hot core expansion, increased
The size of adduction beam end fibre core, so as to increase fibre core dutycycle and mould field dutycycle.The shortcoming of the two schemes is at predispersed fiber
Complex process is managed, manufacture difficulty is big, and the chemical attack of particularly inner cladding is related to deep-etching liquid (such as：Hydrogen fluoride, chemistry
Formula：HF) operate, and the high-precision control difficulty of mechanical lapping is very big, meanwhile, heating includes the final form of core and also is difficult to control.
The content of the invention
The technical problem to be solved in the present invention is to solve existing scheme predispersed fiber complex treatment process, and manufacture difficulty is big, mould
A kind of field low problem of dutycycle, the characteristics of proposing novel optical fiber power beam combiner, the bundling device is to breach light field fibre core biography
Defeated theory, under conditions of fibre core dutycycle is without dramatically increasing, realizes the lifting of mould field dutycycle, rotten without inner cladding
The programs such as erosion, mechanical lapping plus hot core expansion, it is only necessary to fused biconical taper process, you can to complete the making of bundling device.It is described here
Fibre core dutycycle refers to caused by due to fused biconical taper process in addition to fibre core change in duty cycle, without other methods without dramatically increasing
Lift fibre core dutycycle.
To solve the technical problem, novel optical fiber power beam combiner of the present invention is a kind of high mould field dutycycle optical fiber power
Bundling device, the bundling device includes n roots input optical fibre, an optical-fiber bundling portion and an output optical fibre.One end of n root input optical fibres
One end with optical-fiber bundling portion is connected, and the other end in optical-fiber bundling portion is connected with output optical fibre.N is natural number, and n be more than or
Equal to 2.
N root input optical fibres have identical characterisitic parameter, and characterisitic parameter includes：Core diameter, fibre core covering ratio, fibre core number
It is worth aperture.Input optical fibre is single cladded-fiber or doubly clad optical fiber.If input optical fibre is single cladded-fiber, its connection end should be removed
The overlay of optical fiber, retains fiber core and covering；If input optical fibre is doubly clad optical fiber, its connection end should remove the outer of optical fiber
Covering, retains the fibre core and inner cladding of optical fiber.In the following description, the interior bag of the covering of single cladded-fiber and doubly clad optical fiber
Layer (being free of surrounding layer) is unified to be stated with " covering ".
N root input optical fibre arrangement modes are not limited, but should ensure that close, uniform.Preferably, n roots input optical fibre arrangement institute is right
The diameter for the cross section circumscribed circle (can include the minimum circle of all cross section of optic fibre) answered is minimum, such as：Work as input optical fibre
Quantity n=3 when, preferably Chinese character pin-shaped arrangement architecture；When quantity n=6m+1 (m is natural number) of input optical fibre, preferably arrange
Array structure is：Three fiber optic hub lines of arbitrary neighborhood are equilateral triangle.
Optical-fiber bundling portion is that the optical fiber formed by n roots optical fiber through fused biconical taper draws cone-beam, the n root optical fiber knots in optical-fiber bundling portion
Structure is identical, has identical covering and core diameter and identical arrangement mode with n root input optical fibres, and long and slender with input light
Core alignment connection.By fused biconical taper process, n roots optical fiber one entirety of formation in optical-fiber bundling portion, also, from input light
The connected one end of fibre is to the other end being connected with output optical fibre, and cross section is gradually reduced, in approximate cone-shape structure.With cross section
Reduction, the diameter of fibre core and covering in optical-fiber bundling device also tapers into, but fibre core dutycycle is constant (ignores n roots here
Influence to fibre core dutycycle when fiber fuse turns into an entirety).Preferably, n roots input optical fibre and optical-fiber bundling portion one
Fused biconical taper is completed.
The effect in optical-fiber bundling portion is the mould field dutycycle for lifting light beam so that each light beam is entered with high mould field dutycycle
In output optical fibre.In order to realize the effect of lifting mould field dutycycle, light beam need to undergo two stages when optical-fiber bundling portion is transmitted,
First stage is that mould field is collapsed the stage, and the energy major constraints of light beam are transmitted in fibre core, as core diameter is gradually reduced,
The mode field diameter of light beam also reduces therewith, and mould field dutycycle is approximately determined by fibre core dutycycle.Because fibre core dutycycle is without notable
Lifting, therefore collapsed the stage in mould field, mould field dutycycle is also without being obviously improved, and prior art is all based on this transmitting procedure
Build.Second transmission stage is that mould field is expanded the stage, and the stage is the key for lifting mould field dutycycle.Rank is expanded in mould field
Section, the energy of light beam, which has no longer been constrained in fibre core, to be transmitted, and the diameter that this is primarily due to fibre core is too small, so that it cannot will
The energy constraint of light beam is in fibre core, and its result causes the energy of light beam to be spread to fibre core exterior domain, and the diffusion of beam energy
Also the increase of mode field diameter is had led to so that mode field diameter is more than core diameter；It is more and more with the reduction of core diameter
Energy be diffused into outside fibre core, mode field diameter also further increases, and beam energy is gradually filled with the region between fibre core so that
So that the end (other end in the optical-fiber bundling portion being connected with output optical fibre) in optical-fiber bundling portion, mould field dutycycle can be near
Approximately equal to 1.So as in the case where fibre core dutycycle is without dramatically increasing, realize the light beam synthesis of high mould field dutycycle.In order to protect
Card optical-fiber bundling portion has the lifting of mould field dutycycle, it is desirable to optical-fiber bundling portion end, core diameter (unit is micron) and numerical value
The product in aperture (referring to the square root of fiber core refractive index and the difference of two squares of cladding index, no unit) is numerically not more than 0.4.
The output optical fibre can be single cladded-fiber, or doubly clad optical fiber；The core diameter of output optical fibre should not be small
The external diameter of a circle of end cross section in optical-fiber bundling portion, and the fibre core of output optical fibre should be aligned with the end in optical-fiber bundling portion
Welding.
The solution have the advantages that the theory of light field fibre core transmission is breached, in fibre core dutycycle without the bar dramatically increased
Under part, the light beam synthesis of high mould field dutycycle is realized, mould field dutycycle can reach more than 90%, it is no longer necessary to complicated light
Fine preprocessing process and plus hot core expansion process, greatly simplifie optical fiber pretreating process and manufacture difficulty.
Brief description of the drawings
Fig. 1 is the structural representation of optic fiber power beam combiner of the present invention；
Preferred arrangement when Fig. 2 is input optical fibre quantity n=3；
Preferred arrangement when Fig. 3 is input optical fibre quantity n=19；
Fig. 4 is a kind of structural representation of embodiment of optic fiber power beam combiner of the present invention；
Fig. 5 is A-A cross-sectional views in embodiment Fig. 4
Fig. 6 is B-B cross-sectional views in embodiment Fig. 4
Embodiment
Fig. 1 gives the basic structure schematic diagram of the present invention, and described high mould field dutycycle optic fiber power beam combiner includes n
Root input optical fibre 10, an optical-fiber bundling portion 20 and an output optical fibre 30.One end of n roots input optical fibre 10 and optical-fiber bundling portion
20 one end is connected, and the other end in optical-fiber bundling portion 20 is connected with output optical fibre 30.Preferably, n roots input optical fibre 10 and optical fiber
The integral fused biconical taper in beam portion 20 is closed to complete.
Each input optical fibre 10 can be single cladded-fiber or doubly clad optical fiber.If input optical fibre 10 is
Single cladded-fiber, it includes the first overlay 11, the first covering 12 and the first fibre core 13；If input optical fibre 10 is double clad light
Fibre, it includes the first surrounding layer 14, the first inner cladding 15 and the first fibre core 13.The connection end (right-hand member) of input optical fibre 10 needs stripping
Remove the first overlay 11 or the first surrounding layer 14 and expose the first covering 12 or the first inner cladding 15.The first of the end input optical fibre
The inner cladding 15 of covering 12 or first should be close, evenly distributed, when Fig. 2 and Fig. 3 give input optical fibre quantity n=3 and n=19
Two kinds of preferred arrangement modes.
Optical-fiber bundling portion 20 is that the optical fiber formed by n roots optical fiber through fused biconical taper draws cone-beam, the n root light in optical-fiber bundling portion 20
Fine structure is identical, has identical covering and core diameter and identical arrangement mode, and and input light with n root input optical fibres
The first fibre core 13 alignment connection of fibre 10；By fused biconical taper process, the n roots optical fiber formation one in optical-fiber bundling portion 20 is whole
Body, optical-fiber bundling portion 20 is gradually reduced from many input optical fibre connection ends to output optical fibre connection end, forms approximate cone-shape structure,
Fibre core and cross sectional dimensions also reduce therewith.The output optical fibre connection end in optical-fiber bundling portion 20 and the second fibre core of output optical fibre 30
33 alignment weldings.
Output optical fibre 30 can be single cladded-fiber or doubly clad optical fiber.If output optical fibre 30 is single covering
Optical fiber, it includes the second overlay 31, the second covering 32 and the second fibre core 33；If output optical fibre 30 is doubly clad optical fiber, it
Include the second surrounding layer 34, the second inner cladding 35 and the second fibre core 33.The connection end (left end) of output optical fibre 30 needs to peel off
Two overlays 31 or the second surrounding layer 34 and expose the second covering 32 or the second inner cladding 35.Second fibre core 33 of output optical fibre 30
Diameter should be not less than the external diameter of a circle in output optical fibre connection end (right-hand member) cross section in optical-fiber bundling portion 20, and output optical fibre
30 the second fibre core 33 should be directed at welding with the output optical fibre connection end (right-hand member) in optical-fiber bundling portion 20.
Fig. 4 gives one embodiment of the present of invention, and the input optical fibre 10 that the embodiment is selected is doubly clad optical fiber, first
The diameter of fibre core 13 is 15 microns, and numerical aperture is 0.1, a diameter of 130 microns of the first inner cladding 15, the row of the first inner cladding 15
Row mode selects arrangement mode as shown in Figure 2, and light beam is 1.064 microns of basic mode light beam.Optical-fiber bundling portion 20 by with it is defeated
The mode for entering the integral fused biconical taper of optical fiber 10 realizes, the process phase of the first inner cladding 15 of three input optical fibres 10 in fused biconical taper
Mutually fusion is integrally formed (see Fig. 5 and Fig. 6), and the core diameter of optical-fiber bundling portion end and the product of numerical aperture are 0.2.Figure
5 and Fig. 6 sets forth the sectional view and light beam mould field of location A (mould field is collapsed the stage) and B location (mould field expands the stage)
16 distribution situation, from figure 5 it can be seen that light beam major constraints are in the first fibre core 13, the diameter of light beam mould field 16 and
The diameter approximately equal of one fibre core 13；But, as can be seen from Figure 6：The diameter of light beam mould field 16 is compared with the diameter of the first fibre core 13
Have and dramatically increase, accordingly, mould field dutycycle is also substantially improved, and can reach 90%.Output optical fibre 30 is doubly clad optical fiber,
A diameter of the 40 of second fibre core 31, numerical aperture is 0.12, by the second fibre core 31 and the optical-fiber bundling portion 20 of output optical fibre 30
Right-hand member carries out alignment welding, you can obtain 3x1 optic fiber power beam combiners.The insertion loss of the optic fiber power beam combiner averagely exists
0.1dB or so.
Claims (7)
1. a kind of high mould field dutycycle optic fiber power beam combiner, it is characterised in that high mould field dutycycle optic fiber power beam combiner includes
N roots input optical fibre (10), an optical-fiber bundling portion (20) and an output optical fibre (30)；One end of n roots input optical fibre (10) with
The one end in optical-fiber bundling portion (20) is connected, and the other end of optical-fiber bundling portion (20) is connected with output optical fibre (30)；N is to be more than or wait
In 2 natural number；Optical-fiber bundling portion is that the optical fiber formed by n roots optical fiber through fused biconical taper draws cone-beam, the n root light in optical-fiber bundling portion
Fine structure is identical, has identical covering and core diameter and identical arrangement mode, and and input light with n root input optical fibres
First fibre core (13) the alignment connection of fine (10)；By fused biconical taper process, the n roots optical fiber formation one in optical-fiber bundling device is whole
Body, optical-fiber bundling portion (20) are gradually reduced from many input optical fibre connection ends to output optical fibre connection end, form approximate cone-shape knot
Structure, fibre core and cross sectional dimensions also reduce therewith；The output optical fibre connection end in optical-fiber bundling portion (20) and output optical fibre (30)
Second fibre core (33) is directed at welding；The core diameter and the product of numerical aperture of the output optical fibre connection end in optical-fiber bundling portion (20)
No more than 0.4, the unit of the core diameter of the output optical fibre connection end is micron.
2. high mould field dutycycle optic fiber power beam combiner as claimed in claim 1, it is characterised in that each input optical fibre
(10) it is single cladded-fiber or doubly clad optical fiber；If input optical fibre (10) is single cladded-fiber, it includes the first overlay
(11), the first covering (12) and the first fibre core (13)；If input optical fibre (10) is doubly clad optical fiber, it includes the first surrounding layer
(14), the first inner cladding (15) and the first fibre core (13)；The connection end of input optical fibre (10) needs to peel off the first overlay (11)
Or first surrounding layer (14) and expose the first covering (12) or the first inner cladding (15)；The first covering (12) of the end input optical fibre
Or first inner cladding (15) it is close, evenly distributed.
3. high mould field dutycycle optic fiber power beam combiner as claimed in claim 2, it is characterised in that n roots input optical fibre arranges institute
The corresponding external diameter of a circle in cross section is minimum, and cross section circumscribed circle, which refers to, can include the minimum circle of all cross section of optic fibre.
4. high mould field dutycycle optic fiber power beam combiner as claimed in claim 3, it is characterised in that as the quantity n of input optical fibre
During=6m+1, m is natural number, and the arrangement architecture of input optical fibre is：Three fiber optic hub lines of arbitrary neighborhood are equilateral triangle
Shape.
5. high mould field dutycycle optic fiber power beam combiner as claimed in claim 4, it is characterised in that as the quantity n of input optical fibre
When=3, input optical fibre is arranged in Chinese character pin-shaped.
6. high mould field dutycycle optic fiber power beam combiner as claimed in claim 1, it is characterised in that n roots input optical fibre (10) with
Optical-fiber bundling portion (20) one fused biconical taper is completed.
7. high mould field dutycycle optic fiber power beam combiner as claimed in claim 1, it is characterised in that output optical fibre (30) is single
Cladded-fiber or doubly clad optical fiber；If output optical fibre (30) is single cladded-fiber, it includes the second overlay (31), the second bag
Layer (32) and the second fibre core (33)；If output optical fibre (30) is doubly clad optical fiber, it is comprising in the second surrounding layer (34), second
Covering (35) and the second fibre core (33)；The connection end of output optical fibre (30) needs to peel off the second overlay (31) or the second surrounding layer
(34) the second covering (32) or the second inner cladding (35) are exposed；The diameter of the second fibre core (33) of output optical fibre (30) is not less than
The external diameter of a circle in output optical fibre connection end cross section in optical-fiber bundling portion (20), and the second fibre core (33) of output optical fibre (30)
Welding is directed at the output optical fibre connection end of optical-fiber bundling portion (20).
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| JP2018036361A (en) * | 2016-08-30 | 2018-03-08 | 株式会社フジクラ | Optical fiber bundle, combiner, laser device, and method of manufacturing optical fiber bundle |
| CN106405742A (en) * | 2016-10-20 | 2017-02-15 | 南方科技大学 | Optical fiber beam combiner and manufacturing method thereof |
| CN106911059B (en) * | 2017-02-24 | 2019-03-26 | 中国人民解放军国防科学技术大学 | All optical fibre structure 980nm wave band high-power fiber oscillator |
| CN107132619A (en) * | 2017-06-23 | 2017-09-05 | 深圳市阿集比光电科技有限公司 | Laser closes beam system and the compound conjunction beam system of laser |
| CN110488503B (en) * | 2019-09-24 | 2024-02-27 | 上海飞博激光科技股份有限公司 | Point ring laser output structure with adjustable beam energy distribution |
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