CN104330848A - Optical fiber power beam combiner with high mode field duty ratio - Google Patents
Optical fiber power beam combiner with high mode field duty ratio Download PDFInfo
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- CN104330848A CN104330848A CN201410686102.3A CN201410686102A CN104330848A CN 104330848 A CN104330848 A CN 104330848A CN 201410686102 A CN201410686102 A CN 201410686102A CN 104330848 A CN104330848 A CN 104330848A
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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
-
- 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
Abstract
The invention discloses an optical fiber power beam combiner with a high mode field duty ratio. The purpose is to solve the problems of complex technology, high manufacturing difficulty, low mode field duty ratio and the like in the existing scheme. The optical fiber power beam combiner with the high mode field duty ratio comprises n input optical fibers, an optical fiber beam combining part and an output optical fiber, wherein one end of the optical fiber beam combining part is connected with the n input optical fibers while the other end thereof is connected with the output optical fiber; the optical fiber beam combining part is an optical fiber tapering beam formed by fusing and tapering n optical fibers; the n optical fibers of the optical fiber beam combining part are same in lapping layer, fiber core diameter and arrangement mode as the n input optical fibers, and are connected with the fiber cores of the input optical fibers in an aligned manner; the optical fiber beam combining part is reduced gradually from the connecting ends of the multiple input optical fibers to the connecting end of the output optical fiber to form a cone-like structure, and the fiber cores and the cross sections are also reduced; the output optical fiber connecting end of the optical fiber beam combining part is connected with the fiber core of the output optical fiber in an aligning and fusing manner. According to the invention, beam combination with high mode field duty ratio is realized when the duty ratios of the fiber cores are not increased obviously.
Description
Technical field
The present invention relates to field of laser device technology.Particularly relate to one to have concurrently and high close Shu Nengli and high light beam quality and manufacture craft simple high mould field dutycycle optic fiber power beam combiner.
Background technology
Fiber laser has the features such as quality is light, compact conformation, life-span length, good beam quality, antijamming capability are strong, has a wide range of applications in fields such as communication, sensing, machining, medical treatment, scientific research and national defense and military.Particularly along with the develop rapidly of fiber laser power level in recent years, the range of application of fiber laser is also in continuous expansion, and concerned degree is also more and more higher.Although the power level of fiber laser has had the development of advancing by leaps and bounds, reach 10kW magnitude, the power level of simple optical fiber laser instrument promotes the restriction still having the factor such as brightness, nonlinear effect being subject to pump light source further.And optic fiber power beam combiner is expected to provide a kind of effective solution for breaking through this power limit.
Optic fiber power beam combiner is a kind of optical fibre device for light beam synthesis, and its effect is merged in the fibre core of same output optical fibre transmitting beam in multiple optical fiber.In high-capacity optical fiber laser, the application of optic fiber power beam combiner is mainly reflected in two aspects: one is be merged in an output optical fibre by the output beam of multiple high-capacity optical fiber laser, thus realizes the lifting of gross output; Two is the fiber laser of multiple mid power, high light beam quality is carried out the cascaded pump source of light beam synthesis as high-capacity optical fiber laser, thus realizes the pump light source of high brightness.
Based on the application of optic fiber power beam combiner, performance major embodiment two aspects of optic fiber power beam combiner: is close Shu Nengli, and light beam coupling as much as possible namely will be made in the fibre core of output optical fibre; Two is the beam qualities synthesizing rear light beam, and under equal-wattage level conditions, beam quality is more high better.Promote the performance of optic fiber power beam combiner, important means are exactly the mould field dutycycle increasing bundling device, mould field dutycycle refers to is closing the ratio of each light beam mode field diameter of bundle position with two adjacent beams centre distances, if light beam constrains in fibre core transmit (namely the energy major constraints of light beam transmits in fibre core), so mould field dutycycle is approximately equal to fibre core dutycycle (core diameter and two adjacent core centre ratio of distances constants).Mould field dutycycle is higher, and 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 more; Meanwhile, mould field dutycycle is higher, is more conducive to exciting of low step mode in output optical fibre, thus is conducive to the lifting of beam quality.
Existing optical-fiber bundling device is all build on the basis of light beam fibre core transmission, therefore for these bundling devices, mould field dutycycle is determined by fibre core dutycycle, as patent of invention signal light combiner and preparation method thereof (publication number CN101866032A), this invention by the mode of fused biconical taper, by multiple light beam coupling in same fibre core; But, owing to drawing cone process can not significantly promote fibre core dutycycle, the mould field dutycycle of bundling device also just significantly cannot be promoted.In order to promote the mould field dutycycle of bundling device, patent of invention optic fiber power beam combiner and preparation method thereof (publication number CN102116902A) and patent of invention high beam quality signal light fiber beam combiner and preparation method thereof (publication number CN102778729A) provide two schemes, two schemes all have employed the mode of chemical corrosion and mechanical lapping to reduce the size of optical fiber inner cladding, improve fibre core dutycycle, thus improve mould field dutycycle, but this method can only make mould field dutycycle rise to 0.5, this dutycycle is still not enough to the requirement meeting beam quality optimization.In order to further Lifting Modules field dutycycle, the latter proposes the method utilizing and add hot core expansion, increases the size of closing bundle end fibre core, thus increases fibre core dutycycle and mould field dutycycle.The shortcoming of these two schemes is predispersed fiber complex treatment process, manufacture difficulty is large, particularly the chemical corrosion of inner cladding relates to deep-etching liquid (as: hydrogen fluoride, chemical formula: HF) operation, and the high precision of mechanical lapping control difficulty is very large, meanwhile, heating is drawn together the final form of core and is also difficult to control.
Summary of the invention
The technical problem to be solved in the present invention solves existing approach Optical fiber pretreating process complexity, the problems such as manufacture difficulty is large, mould field dutycycle is low, a kind of novel optical fiber power beam combiner is proposed, the feature of this bundling device is the theory breaching the transmission of light field fibre core, in fibre core dutycycle without under the condition significantly increased, achieve the lifting of mould field dutycycle, without the need to the mechanical lapping of inner cladding burn into, add hot core expansion supervisor, only need fused biconical taper process, namely can complete the making of bundling device.Fibre core dutycycle described here, without remarkable increase, refers to except the fibre core change in duty cycle caused due to fused biconical taper process, promotes fibre core dutycycle without other method.
For solveing the technical problem, novel optical fiber power beam combiner of the present invention is a kind of high mould field dutycycle optic fiber power beam combiner, and this bundling device comprises n root input optical fibre, an optical-fiber bundling portion and an output optical fibre.One end of n root input optical fibre is all connected with the one end in optical-fiber bundling portion, and the other end in optical-fiber bundling portion is connected with output optical fibre.N is natural number, and n is more than or equal to 2.
N root input optical fibre has identical characterisitic parameter, and characterisitic parameter comprises: core diameter, fibre core covering ratio, fibre core numerical aperture.Input optical fibre is single cladded-fiber or doubly clad optical fiber.If input optical fibre is single cladded-fiber, its link should remove the overlay of optical fiber, retains fiber core and covering; If input optical fibre is doubly clad optical fiber, its link should remove the surrounding layer of optical fiber, retains fibre core and the inner cladding of optical fiber.In the following description, the covering of single cladded-fiber and inner cladding (not containing the surrounding layer) unification of doubly clad optical fiber are stated with " covering ".
N root input optical fibre arrangement mode is not limit, but should ensure closely, evenly.Preferably, the diameter of the xsect circumscribed circle (namely can comprise the minimum circle of all cross section of optic fibre) corresponding to the arrangement of n root input optical fibre is minimum, as: as the quantity n=3 of input optical fibre, preferably Chinese character pin-shaped arrangement architecture; When quantity n=6m+1 (m is natural number) of input optical fibre, preferred arrangement structure is: arbitrary neighborhood three fiber optic hub lines are equilateral triangle.
Optical-fiber bundling portion is that the optical fiber formed through fused biconical taper by n root optical fiber draws cone-beam, and the n root optical fiber structure in optical-fiber bundling portion is identical, has identical covering and core diameter and identical arrangement mode with n root input optical fibre, and aims at input optical fibre fibre core and be connected.By fused biconical taper process, the n root optical fiber in optical-fiber bundling portion forms an entirety, and from the one end be connected with input optical fibre to the other end be connected with output optical fibre, xsect reduces gradually, in approximate cone-shape structure.Along with the reduction of xsect, the fibre core in optical-fiber bundling device and the diameter of covering also diminish gradually, but fibre core dutycycle constant (ignoring the impact on fibre core dutycycle when n root fiber fuse becomes as a whole here).Preferably, n root input optical fibre and optical-fiber bundling portion one fused biconical taper complete.
The effect in optical-fiber bundling portion is the mould field dutycycle promoting light beam, makes each light beam enter into output optical fibre with high mould field dutycycle.In order to realize the effect of Lifting Modules field dutycycle, light beam need experience two stages when transmitting in optical-fiber bundling portion, first stage is collapsed the stage in mould field, the energy major constraints of light beam transmits in fibre core, along with core diameter reduces gradually, the mode field diameter of light beam also reduces thereupon, and mould field dutycycle is approximate to be determined by fibre core dutycycle.Because fibre core dutycycle is without remarkable lifting, therefore collapse the stage in mould field, mould field dutycycle is also without obviously promoting, and prior art is all build based on this transmitting procedure.Second transmit stage is that the stage is expanded in mould field, and this stage is the key of Lifting Modules field dutycycle.The stage is expanded in mould field, the energy of light beam has no longer constrained in fibre core and has transmitted, this is mainly because the diameter of fibre core is too small, to such an extent as to cannot by the energy constraint of light beam in fibre core, its result causes the energy of light beam to spread to fibre core exterior domain, and the diffusion of beam energy also just result in the increase of mode field diameter, mode field diameter is made to be greater than core diameter; Along with the minimizing of core diameter, increasing energy is diffused into outside fibre core, mode field diameter also increases further, beam energy is full of the region between fibre core gradually, thus making the end (other end in the optical-fiber bundling portion be namely connected with output optical fibre) in optical-fiber bundling portion, mould field dutycycle can be approximately equal to 1.Thus in fibre core dutycycle without when significantly increasing, realize the light beam synthesis of high mould field dutycycle.In order to ensure that optical-fiber bundling portion has mould field dutycycle and promotes, require optical-fiber bundling portion end, the product of core diameter (unit is micron) and numerical aperture (referring to the square root of the difference of two squares of fiber core refractive index and cladding index, without unit) is numerically not more than 0.4.
Described output optical fibre can be single cladded-fiber, also can be doubly clad optical fiber; The core diameter of output optical fibre should be not less than the external diameter of a circle of end cross section in optical-fiber bundling portion, and the fibre core of output optical fibre should aim at welding with the end in optical-fiber bundling portion.
Technique effect of the present invention is the theory breaching the transmission of light field fibre core, in fibre core dutycycle without under the condition significantly increased, achieve the light beam synthesis of high mould field dutycycle, mould field dutycycle can reach more than 90%, no longer need complicated predispersed fiber processing procedure and add hot core expansion process, greatly simplifiing predispersed fiber treatment process and manufacture difficulty.
Accompanying drawing explanation
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 the structural representation of a kind of embodiment of optic fiber power beam combiner of the present invention;
Fig. 5 be in embodiment Fig. 4 A ?A cross sectional representation
Fig. 6 be in embodiment Fig. 4 B ?B cross sectional representation
Embodiment
Fig. 1 gives basic structure schematic diagram of the present invention, and described high mould field dutycycle optic fiber power beam combiner comprises n root input optical fibre 10, optical-fiber bundling portion 20 and an output optical fibre 30.One end of n root input optical fibre 10 is connected with the one end in optical-fiber bundling portion 20, and the other end in optical-fiber bundling portion 20 is connected with output optical fibre 30.Preferably, n root input optical fibre 10 completes with optical-fiber bundling portion 20 one fused biconical taper.
Each root input optical fibre 10 can be single cladded-fiber, also can be doubly clad optical fiber.If input optical fibre 10 is single cladded-fibers, it comprises the first overlay 11, first covering 12 and the first fibre core 13; If input optical fibre 10 is doubly clad optical fibers, it comprises the first surrounding layer 14, first inner cladding 15 and the first fibre core 13.The link (right-hand member) of input optical fibre 10 needs to peel off the first overlay 11 or the first surrounding layer 14 and exposes the first covering 12 or the first inner cladding 15.First covering 12 of this end input optical fibre or the first inner cladding 15 should be tight, evenly distributed, Fig. 2 and Fig. 3 gives two kinds of preferred arrangement modes during input optical fibre quantity n=3 and n=19.
Optical-fiber bundling portion 20 is that the optical fiber formed through fused biconical taper by n root optical fiber draws cone-beam, the n root optical fiber structure in optical-fiber bundling portion 20 is identical, with n root input optical fibre, there is identical covering and core diameter and identical arrangement mode, and aim at the first fibre core 13 of input optical fibre 10 and be connected; By fused biconical taper process, the n root optical fiber in optical-fiber bundling portion 20 forms an entirety, and optical-fiber bundling portion 20 reduces from many input optical fibre links gradually to output optical fibre link, and form approximate cone-shape structure, fibre core and cross sectional dimensions also reduce thereupon.The output optical fibre link in optical-fiber bundling portion 20 aims at welding with the second fibre core 33 of output optical fibre 30.
Output optical fibre 30 can be single cladded-fiber, also can be doubly clad optical fiber.If output optical fibre 30 is single cladded-fibers, it comprises the second overlay 31, second covering 32 and the second fibre core 33; If output optical fibre 30 is doubly clad optical fibers, it comprises the second surrounding layer 34, second inner cladding 35 and the second fibre core 33.The link (left end) of output optical fibre 30 needs to peel off the second overlay 31 or the second surrounding layer 34 and exposes the second covering 32 or the second inner cladding 35.The diameter of the second fibre core 33 of output optical fibre 30 should be not less than the external diameter of a circle of output optical fibre link (right-hand member) xsect in optical-fiber bundling portion 20, and the second fibre core 33 of output optical fibre 30 should aim at welding with the output optical fibre link (right-hand member) in optical-fiber bundling portion 20.
Fig. 4 gives one embodiment of the present of invention, the input optical fibre 10 that this embodiment is selected is doubly clad optical fibers, the diameter of the first fibre core 13 is 15 microns, numerical aperture is 0.1, the diameter of the first inner cladding 15 is 130 microns, first inner cladding 15 arrangement mode selects arrangement mode as shown in Figure 2, and light beam is the basic mode light beam of 1.064 microns.Optical-fiber bundling portion 20 is by realizing with the mode of input optical fibre 10 one fused biconical taper, first inner cladding 15 of three input optical fibres 10 mutually fuses in the process of fused biconical taper and is integrated (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.Fig. 5 and Fig. 6 sets forth the sectional view of A position (collapsing the stage in mould field) and B position (stage is expanded in mould field) and the distribution situation of light beam mould field 16, as can be seen from Figure 5, light beam major constraints in the first fibre core 13, the diameter of light beam mould field 16 and the diameter approximately equal of the first fibre core 13; But, as can be seen from Figure 6: the diameter of light beam mould field 16 has had remarkable increase compared with the first fibre core 13 diameter, and accordingly, mould field dutycycle also significantly promotes, and can reach 90%.Output optical fibre 30 is doubly clad optical fibers, and the diameter of the second fibre core 31 is 40, and numerical aperture is 0.12, is carried out aiming at welding by the second fibre core 31 of output optical fibre 30, can obtain 3x1 optic fiber power beam combiner with the right-hand member in optical-fiber bundling portion 20.The insertion loss of this optic fiber power beam combiner is on average at about 0.1dB.
Claims (7)
1. a high mould field dutycycle optic fiber power beam combiner, is characterized in that high mould field dutycycle optic fiber power beam combiner comprises n root input optical fibre (10), an optical-fiber bundling portion (20) and an output optical fibre (30); One end of n root input optical fibre (10) is connected with the one end of optical-fiber bundling portion (20), and the other end of optical-fiber bundling portion (20) is connected with output optical fibre (30); N be more than or equal to 2 natural number; Optical-fiber bundling portion is that the optical fiber formed through fused biconical taper by n root optical fiber draws cone-beam, the n root optical fiber structure in optical-fiber bundling portion is identical, with n root input optical fibre, there is identical covering and core diameter and identical arrangement mode, and aim at first fibre core (13) of input optical fibre (10) and be connected; By fused biconical taper process, n root optical fiber in optical-fiber bundling device forms an entirety, optical-fiber bundling portion (20) reduces from many input optical fibre links gradually to output optical fibre link, and form approximate cone-shape structure, fibre core and cross sectional dimensions also reduce thereupon; The output optical fibre link in optical-fiber bundling portion (20) aims at welding with second fibre core (33) of output optical fibre (30); The core diameter of output optical fibre link and the product of numerical aperture in optical-fiber bundling portion (20) are not more than 0.4, and the unit of the core diameter of described output optical fibre link is micron.
2. high mould field as claimed in claim 1 dutycycle optic fiber power beam combiner, is characterized in that each root input optical fibre (10) is single cladded-fiber or doubly clad optical fiber; If input optical fibre (10) is single cladded-fiber, it comprises 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 comprises the first surrounding layer (14), the first inner cladding (15) and the first fibre core (13); The link of input optical fibre (10) needs to peel off the first overlay (11) or the first surrounding layer (14) and exposes the first covering (12) or the first inner cladding (15); First covering (12) or first inner cladding (15) of this end input optical fibre are tight, evenly distributed.
3. high mould field as claimed in claim 2 dutycycle optic fiber power beam combiner, it is characterized in that the external diameter of a circle of xsect corresponding to the arrangement of n root input optical fibre is minimum, xsect circumscribed circle refers to the minimum circle that can comprise all cross section of optic fibre.
4. high mould field as claimed in claim 3 dutycycle optic fiber power beam combiner, when it is characterized in that the quantity n=6m+1 when input optical fibre, m is natural number, and the arrangement architecture of input optical fibre is: arbitrary neighborhood three fiber optic hub lines are equilateral triangle.
5. high mould field as claimed in claim 4 dutycycle optic fiber power beam combiner, when it is characterized in that the quantity n=3 when input optical fibre, input optical fibre is arranged in Chinese character pin-shaped.
6. high mould field as claimed in claim 1 dutycycle optic fiber power beam combiner, is characterized in that n root input optical fibre (10) completes with optical-fiber bundling portion (20) one fused biconical taper.
7. high mould field as claimed in claim 1 dutycycle optic fiber power beam combiner, is characterized 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 comprises 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 comprises the second surrounding layer (34), the second inner cladding (35) and the second fibre core (33); The link of output optical fibre (30) needs to peel off the second overlay (31) or the second surrounding layer (34) and exposes the second covering (32) or the second inner cladding (35); The diameter of second fibre core (33) of output optical fibre (30) is not less than the external diameter of a circle of output optical fibre link xsect in optical-fiber bundling portion (20), and second fibre core (33) of output optical fibre (30) aims at welding with the output optical fibre link of optical-fiber bundling portion (20).
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Cited By (5)
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| CN106405742A (en) * | 2016-10-20 | 2017-02-15 | 南方科技大学 | Optical fiber beam combiner and manufacturing method thereof |
| CN106911059A (en) * | 2017-02-24 | 2017-06-30 | 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 oscillators |
| 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 |
| 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 |
| CN110488503A (en) * | 2019-09-24 | 2019-11-22 | 上海飞博激光科技有限公司 | A kind of beam energy is distributed adjustable loop laser export structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106911059A (en) * | 2017-02-24 | 2017-06-30 | 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 oscillators |
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| CN110488503A (en) * | 2019-09-24 | 2019-11-22 | 上海飞博激光科技有限公司 | A kind of beam energy is distributed adjustable loop laser export structure |
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