CN105487173A - Mode field matching device and optical fiber laser - Google Patents
Mode field matching device and optical fiber laser Download PDFInfo
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- CN105487173A CN105487173A CN201610014994.1A CN201610014994A CN105487173A CN 105487173 A CN105487173 A CN 105487173A CN 201610014994 A CN201610014994 A CN 201610014994A CN 105487173 A CN105487173 A CN 105487173A
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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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- 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
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
Abstract
The invention provides a mode field matching device and an optical fiber laser and belongs to the optical fiber coupling technical field. The mode field matching device comprises a first single-mode optical fiber, a second single-mode optical fiber and a matching optical fiber; the core diameter of the first single-mode optical fiber is greater than the core diameter of the second single-mode optical fiber; the core diameter of the matching optical fiber is larger than the core diameter of the second single-mode optical fiber; the core diameter of the matching optical fiber is smaller than the core diameter of the first single-mode optical fiber; one end of the matching optical fiber is coupled to one end of the first single-mode optical fiber; and the other end of the matching optical fiber is coupled to one end of the second single-mode optical fiber. Compared with a traditional tapered type mode field matching device, the mode field matching device has the advantages of simple and efficient production, low cost, high stability and high rate of finished products, small internal transmission loss and high laser output efficiency. The mode field matching device can be mass produced; and the mode field matching device can be used in a bidirectional manner.
Description
Technical field
The present invention relates to fiber coupling technique field, in particular to a kind of mould field adaptation and fiber laser.
Background technology
In fiber laser, oscillator and amplifier often have different functions, and oscillator generally adopts little mould field single-mode fiber, obtain high light beam quality single mode seed source, and amplifier are in order to obtain more high-power amplification, the large mould area double-cladding optical fiber of general employing.Therefore between oscillator and amplifier, need a kind of mould field adaptation as transition, require to there is low-loss, low beam quality disturbance.General mould field adaptation adopts and draws cone technology, utilizes draw the drawing-down of cone technology by large mould field optical fiber, and then with little mould field fused fiber splice, the technical requirement of most digital-to-analogue field adaptation can be solved like this.But because large mould field optical fiber is drawn cone by needs, this proposes higher requirement to technical matters, need cone district level and smooth, there is no disturbance, otherwise zlasing mode not only can be made to change, also can cause larger insertion loss.In addition, for the optical fiber that cladding diameter is identical, the fibre cladding diameter of drawing-down can diminish thereupon again with little mould field fused fiber splice, can be not of uniform size due to cladding diameter, increase welding difficulty, reduce mould field adaptation yield rate.
Summary of the invention
The object of the present invention is to provide a kind of mould field adaptation and the fiber laser based on this mould field adaptation, realize the efficient coupling of the single-mode fiber of different mode field diameter, effectively to improve above-mentioned problem.
To achieve these goals, the technical scheme of embodiment of the present invention employing is as follows:
The invention provides a kind of mould field adaptation, be applied to single-mode fiber, comprise: the first single-mode fiber, the second single-mode fiber and matched fiber, the core diameter of described first single-mode fiber is greater than the core diameter of described second single-mode fiber, the core diameter of described matched fiber is greater than the core diameter of described second single-mode fiber, and the core diameter of described matched fiber is less than the core diameter of described first single-mode fiber, one end of described matched fiber and the coupled one end of the first single-mode fiber, the other end of described matched fiber and the coupled one end of described second single-mode fiber.
Preferably, the difference of the core diameter of described first single-mode fiber and the core diameter of described second single-mode fiber is more than or equal to 3 microns.
Preferably, the difference of the core diameter of described first single-mode fiber and the core diameter of described matched fiber is between 1.5-2.5 micron, and the difference of the core diameter of described second single-mode fiber and the core diameter of described matched fiber is between 1.5-2.5 micron.
Preferably, the core diameter of described matched fiber is the mean value of the core diameter of described first single-mode fiber and the core diameter of described second single-mode fiber.
Preferably, one end of described matched fiber and one end welding of described first single-mode fiber, the other end of described matched fiber and one end welding of described second single-mode fiber.
Preferably, expand core method by optical fiber and described matched fiber and the core diameter of one end of described first single-mode fiber welding are increased to the first default core diameter; Expand core method by optical fiber and described second single-mode fiber and the core diameter of one end of described matched fiber welding are increased to the second default core diameter.
Preferably, described optical fiber expansion core method comprises optical fiber and adds hot core expansion technology.
Preferably, the core diameter of described first single-mode fiber is 10 microns, and the core diameter of described second single-mode fiber is 6 microns, and described matched fiber is SMF-28e optical fiber.
Present invention also offers a kind of fiber laser, comprise pumping source and laserresonator, described laserresonator comprises the first resonance section, gain fibre and the second resonance section, by above-mentioned mould field adaptation coupling between described first resonance section and described gain fibre; The pump light that described pumping source sends enters described gain fibre successively after described first resonance section after described second single-mode fiber, described matched fiber and described first single-mode fiber.
Preferably, also be provided with described mould field adaptation between described second resonance section and described gain fibre, the flashlight that described gain fibre produces enters described second resonance section successively after described first single-mode fiber, described matched fiber and described second single-mode fiber.
Mould field provided by the invention adaptation is made up of the first single-mode fiber, matched fiber and the second single-mode fiber.Draw bevel-type mould field adaptation compared to traditional, make simple efficient, cost is low, stability and yield rate high, can be mass.
In addition, draw compared with the adaptation of bevel-type mould field with traditional, mould field provided by the invention adaptation can use by forward, namely by external beam from the second single-mode fiber efficient coupling to the first single-mode fiber, and can keep unimodular property; Also oppositely can use, namely by external beam efficient coupling to the second single-mode fiber from the first single-mode fiber, can effectively improve the applicability of mould field adaptation.
Other features and advantages of the present invention are set forth at instructions subsequently, and, partly become apparent from instructions, or understand by implementing the embodiment of the present invention.Object of the present invention and other advantages realize by structure specifically noted in write instructions, claims and accompanying drawing and obtain.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.Shown in accompanying drawing, above-mentioned and other object of the present invention, Characteristics and advantages will be more clear.Reference numeral identical in whole accompanying drawing indicates identical part.Deliberately do not draw accompanying drawing by physical size equal proportion convergent-divergent, focus on purport of the present invention is shown.
Fig. 1 shows the structural representation of a kind of mould field adaptation that first embodiment of the invention provides;
Fig. 2 shows the structural representation of a kind of fiber laser that second embodiment of the invention provides.
Wherein, accompanying drawing illustrates and is respectively:
Mould field adaptation 100; First single-mode fiber 110; Matched fiber 120; Second single-mode fiber 130; Gain fibre 200; First resonance section 310; Second resonance section 320; Pumping source 400; Wavelength division multiplexer 500.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, carry out clear, complete description to the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In fiber laser, oscillator and amplifier often have different functions, and oscillator generally adopts little mould field single-mode fiber, obtain high light beam quality single mode seed source, and amplifier are in order to obtain more high-power amplification, the large mould area double-cladding optical fiber of general employing.Therefore between oscillator and amplifier, need a kind of mould field adaptation as transition, require to there is low-loss, low beam quality disturbance.And traditional draw tapered mould field adaptation make complicated, yield rate is low, cost is high, it is higher to require instrument and equipment, therefore, embodiments provide a kind of mould field adaptation being applied to single-mode fiber, the efficient connection between the single-mode fiber that can realize different core diameter simply efficiently.
First embodiment
The mould field adaptation that the embodiment of the present invention provides, as shown in Figure 1, comprises the first single-mode fiber 110, second single-mode fiber 130 and matched fiber 120.The core diameter of the first single-mode fiber 110 is greater than the core diameter of the second single-mode fiber 130, the core diameter of matched fiber 120 is greater than the core diameter of the second single-mode fiber 130, and the core diameter of matched fiber 120 is less than the core diameter of the first single-mode fiber 110, one end of matched fiber 120 and the coupled one end of the first single-mode fiber 110, the other end of matched fiber 120 and the coupled one end of the second single-mode fiber 130.
Wherein, the core diameter of the first single-mode fiber 110 and the second single-mode fiber 130 can need design according to user, matched fiber 120 is then according to the core diameter of the first single-mode fiber 110 and the core diameter design of the second single-mode fiber 130, concrete, the core diameter size of matched fiber 120 is between the core diameter and the core diameter of the second single-mode fiber 130 of the first single-mode fiber 110.It should be noted that, described core diameter is the core diameter of optical fiber.Such as, can be that the single-mode fiber of 10 microns is as the first single-mode fiber 110 using conventional core diameter, the core diameter of Nufern company such as can be adopted to be 10 microns, cladding diameter is the optical fiber of 125 microns, be that the single-mode fiber of 6 microns is as the second single-mode fiber 130 using core diameter, such as can adopt Nufern1060XP optical fiber and CorningHi1060 optical fiber, now, the core diameter of matched fiber 120 should between 6 ~ 10 microns, such as, can select SMF-28e optical fiber, the core diameter of SMF-28e optical fiber is 8.4 microns.
Core diameter difference exceedes two single-mode fibers of preset range, if directly welding, by there is very large luminous energy loss, is unfavorable for the efficiency utilization of luminous energy.In addition, the energy of loss enters covering and is converted into heat build-up, is easy to cause the temperature at fusion point place too high and damage optical fiber, and thus, the connection of general single mode fiber and large mould field optical fiber needs a mould field adaptation 100 that effectively can reduce loss.Wherein, described preset range can be 3 microns.Now, the core diameter that the core diameter of the first single-mode fiber 110 of the mould field adaptation that the embodiment of the present invention can be provided is designed to the single-mode fiber larger with core diameter mates, the core diameter that the core diameter of the second single-mode fiber 130 is designed to the single-mode fiber less with core diameter mates, such as, the single-mode fiber that large core diameter is larger can be the gain fibre 200 in fiber laser, and the single-mode fiber that core diameter is less can be the tail optical fiber of the oscillator in fiber laser.Now, on the one hand, external beam can enter the second single-mode fiber 130 from the single-mode fiber that core diameter is less, by matched fiber 120 efficient coupling to the first single-mode fiber 110, and then transfers to the larger single-mode fiber of core diameter; On the other hand, external beam can enter the first single-mode fiber 110 from the single-mode fiber that core diameter is larger, by matched fiber 120 efficient coupling to the second single-mode fiber 130, and then transfers to the less single-mode fiber of core diameter.
Such as, realize the first conduction optical fiber that light beam from core diameter is 10 microns, transfer to core diameter be 6 microns second conduction optical fiber time, first single-mode fiber 110 adopts core diameter to be the single-mode fiber of 10 microns, second single-mode fiber 130 adopts core diameter to be the single-mode fiber of 6 microns, matched fiber 120 adopts core diameter to be the SMF-28e optical fiber of 8.4 microns, the one end be one end and the core diameter of the SMF-28e optical fiber of 8.4 microns by core diameter being the single-mode fiber of 10 microns is connected, the one end be the other end and the core diameter of the SMF-28e optical fiber of 8.4 microns by core diameter being the single-mode fiber of 6 microns is connected, form the mould field adaptation 100 that the embodiment of the present invention provides.During use, to be the first conduction optical fiber of 10 microns and core diameter by the core diameter that this mould field adaptation 100 is used for realizing light beam high efficiency of transmission be 6 microns second conduct between optical fiber, by in this mould field adaptation 100, core diameter is that Fiber connection is conducted in one end away from SMF-28e optical fiber and first of the single-mode fiber of 10 microns, core diameter is that Fiber connection is conducted in one end away from SMF-28e optical fiber and second of the single-mode fiber of 6 microns, now, the insertion loss of this mould field adaptation 100 can be less than 0.5dB.
The mould field adaptation that the embodiment of the present invention provides makes simple efficient, cost is low, stability and yield rate high, can be mass, avoid the insertion loss caused because La Zhuizhui district is uneven in the adaptation of traditional mould field to increase, significantly reduce the luminous energy loss of transmitting procedure.In addition, the mould field adaptation provided due to the embodiment of the present invention can two-wayly use, namely when forward uses, external beam can enter matched fiber 120 from the second single-mode fiber 130, enter the first single-mode fiber 110 again, during reverse use, external beam can enter matched fiber 120 from the first single-mode fiber 110, then enters the second single-mode fiber 130.Therefore, external beam both can keep unimodular property from the single-mode fiber of larger mode field diameter and efficient coupling to the single-mode fiber of less mode field diameter, unimodular property can be kept from the single-mode fiber of less mode field diameter again and efficient coupling to the single-mode fiber of larger mode field diameter, relative to drawing bevel-type mould field adaptation, effectively improve the applicability of mould field adaptation.
When the first single-mode fiber 110 set according to preliminary election and the second single-mode fiber 130 design matched fiber 120, preferably, the difference of the core diameter of the first single-mode fiber 110 and the core diameter of matched fiber 120 can between 1.5-2.5 micron, and the difference of the core diameter of the second single-mode fiber 130 and the core diameter of matched fiber 120 also can between 1.5-2.5 micron.Certainly, when the core diameter of matched fiber 120 is the mean value of the core diameter of the first single-mode fiber 110 and the core diameter of the second single-mode fiber 130, the coupling effect of mould field adaptation 100 is best, and optical transmission loss is minimum.
Concrete, the processing mode of the mould field adaptation that the embodiment of the present invention provides can be: one end of described matched fiber 120 and one end welding of the first single-mode fiber 110, the other end of described matched fiber 120 and one end welding of described second single-mode fiber 130.Concrete, in this mould field adaptation 100, the first single-mode fiber 110 comprises the first link and the second link, and matched fiber 120 comprises the 3rd link and the 4th link, and the second single-mode fiber 130 comprises the 5th link and the 6th link.Wherein, first link of the first single-mode fiber 110 is used for being connected with the gain fibre 200 in the external devices such as fiber laser of described first single-mode fiber 110 adaptation with core diameter, second link of the first single-mode fiber 110 and the 3rd link welding of matched fiber 120,4th link of matched fiber 120 and the 5th link welding of the second single-mode fiber 130, the 6th link of the second single-mode fiber 130 is used for being connected with the tail optical fiber of core diameter with the oscillator in the external devices such as fiber laser of described second single-mode fiber 130 adaptation.
Because the core diameter of the first single-mode fiber 110 and the core diameter of the second single-mode fiber 130 all there are differences with the core diameter of matched fiber 120, in order to ensure the first single-mode fiber 110 and matched fiber 120 and the low loss welding between the second single-mode fiber 130 and matched fiber 120, need in the present embodiment first to carry out the process of expansion core to matched fiber 120 and the second single-mode fiber 130.Concrete, the embodiment of described expansion core process can be: expand core method by optical fiber and the core diameter of the 3rd link of matched fiber 120 is increased to the first default core diameter; Expand core method by optical fiber and the core diameter of the 5th link of the second single-mode fiber 130 is increased to the second default core diameter, namely the mode field diameter of the 3rd link of matched fiber 120 and the 5th link of the second single-mode fiber 130 is increased, so that realize between the second link of the first single-mode fiber 110 and the 3rd link of matched fiber 120 and efficient welding between the 4th link of matched fiber 120 and the 5th link of the second single-mode fiber 130, as shown in Figure 1.Wherein, first presets core diameter is arranged according to the core diameter of the first single-mode fiber 110, and second presets core diameter is arranged according to the core diameter of matched fiber 120.
It should be noted that, optical fiber expands core method and mainly contains: add hot core expansion method, reverse drawing cone method, etch, molten daraf(reciprocal of farad) etc.In the present embodiment, optical fiber is preferably adopted to add hot core expansion technology.Be directed to single-mode fiber, optical fiber adds hot core expansion technology can reduce splice loss, splice attenuation effectively, to reduce the luminous energy loss of mould field adaptation 100.The ultimate principle that optical fiber adds hot core expansion technology is: the dopant of general single mode fiber is germanium, and when fiber optic temperature is more than 1200 DEG C, the germanium in fibre core can spread to covering, and the refractive index of fibre core reduces, and numerical aperture diminishes, and can become large by equivalent core diameter.
Concrete, the embodiment realizing efficient welding between the second link of the first single-mode fiber 110 and the 3rd link of matched fiber 120 can be: before the second link of the first single-mode fiber 110 and the 3rd link welding of matched fiber 120, first by optical fiber splicer electric discharge, hot core expansion is added to the 3rd link of matched fiber 120, make the core diameter of the 3rd link of matched fiber 120 increase to first and preset core diameter, after this, then to the 3rd link of the second link of the first single-mode fiber 110 and the matched fiber 120 after expanding core carry out welding.
In addition, the embodiment realizing efficient welding between the second link of the first single-mode fiber 110 and the 3rd link of matched fiber 120 can also be: before the second link of the first single-mode fiber 110 and the 3rd link welding of matched fiber 120, first draw three link of the flame of cone machine to matched fiber 120 to add hot core expansion by optical fiber, make the core diameter of the 3rd link of matched fiber 120 increase to first and preset core diameter.
In like manner, between 4th link of matched fiber 120 and the 5th link of the second single-mode fiber 130 the efficient implementation of welding and between the second link of above-mentioned first single-mode fiber 110 and the 3rd link of matched fiber 120 implementation of efficient welding identical, repeat no more herein.
Second embodiment
Present embodiments provide a kind of fiber laser of the mould field adaptation based on providing in the first embodiment, as shown in Figure 2, described fiber laser comprises pumping source 400 and laserresonator, described laserresonator comprises the first resonance section 310, gain fibre 200 and the second resonance section 320, is coupled between described first resonance section 310 and described gain fibre 200 by mould field adaptation 100 as in the first embodiment.The pump light that pumping source 400 sends can input to the first resonance section 310 through wavelength division multiplexer 500, and the pump light through the first resonance section 310 enters gain fibre 200 successively after the second single-mode fiber 130, matched fiber 120 and the first single-mode fiber 110.
Wherein, the first resonance section 310 and the second resonance section 320 all can adopt fiber grating, and gain fibre 200 can be rare-earth-ion-doped glass optical fiber, such as Yb dosed optical fiber, Er-doped fiber, thulium doped fiber etc.
In addition, also above-mentioned mould field adaptation 100 is provided with between described second resonance section 320 and described gain fibre 200, after pump light enters gain fibre 200, gain fibre 200 produce flashlight after described first single-mode fiber 110, described matched fiber 120 and described second single-mode fiber 130, enter described second resonance section 320 successively, through second resonance section 320 reflect after in laserresonator multiple oscillation with Output of laser.
The fiber laser that the present embodiment provides achieves the efficient coupling between the first resonance section 310 and gain fibre 200 and between the second resonance section 320 and gain fibre 200 by above-mentioned mould field adaptation 100.The pump light that pumping source 400 sends can input to the first resonance section 310 through wavelength division multiplexer 500, pump light through the first resonance section 310 enters gain fibre 200 successively after the second single-mode fiber 130, matched fiber 120 and the first single-mode fiber 110, and the flashlight that gain fibre 200 produces enters the second resonance section 320 successively after the first single-mode fiber 110, matched fiber 120 and described second single-mode fiber 130; The flashlight that second resonance section is reflected back returns after gain fibre 200 amplifies through the second single-mode fiber 130, matched fiber 120 and the first single-mode fiber 110 successively again and arrives the first resonance section 310 through the first single-mode fiber 110, matched fiber 120 and the second single-mode fiber 130 successively again, completes and once vibrates.Therefore, in this fiber laser, light beam both can keep unimodular property from the gain fibre 200 of larger mode field diameter and efficient coupling to the first resonance section 310 of less mode field diameter or the tail optical fiber of the second resonance section 320, unimodular property can be kept from the tail optical fiber of the first resonance section 310 of less mode field diameter or the second resonance section 320 again and efficient coupling to the gain fibre 200 of larger mode field diameter.
What the fiber laser provided due to the present embodiment have employed that above-mentioned first embodiment provides can the mould field adaptation of two-way use, relative to adopting the fiber laser drawing bevel-type mould field adaptation, effectively can reduce the first resonance section and gain fibre and the loss between gain fibre and the second resonance section, and then effectively improve the Laser output efficiency of this fiber laser.Wherein, the concrete structure of described mould field adaptation 100 and principle, see the first embodiment, repeat no more herein.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing ", " coupling " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (10)
1. a mould field adaptation, it is characterized in that, comprise: the first single-mode fiber, the second single-mode fiber and matched fiber, the core diameter of described first single-mode fiber is greater than the core diameter of described second single-mode fiber, the core diameter of described matched fiber is greater than the core diameter of described second single-mode fiber, and the core diameter of described matched fiber is less than the core diameter of described first single-mode fiber, one end of described matched fiber and the coupled one end of the first single-mode fiber, the other end of described matched fiber and the coupled one end of described second single-mode fiber.
2. mould field according to claim 1 adaptation, is characterized in that, the difference of the core diameter of described first single-mode fiber and the core diameter of described second single-mode fiber is more than or equal to 3 microns.
3. mould field according to claim 2 adaptation, it is characterized in that, the difference of the core diameter of described first single-mode fiber and the core diameter of described matched fiber is between 1.5-2.5 micron, and the difference of the core diameter of described second single-mode fiber and the core diameter of described matched fiber is between 1.5-2.5 micron.
4. mould field according to claim 3 adaptation, is characterized in that, the core diameter of described matched fiber is the mean value of the core diameter of described first single-mode fiber and the core diameter of described second single-mode fiber.
5. the mould field adaptation according to any one of claim 1-4, is characterized in that, one end of described matched fiber and one end welding of described first single-mode fiber, the other end of described matched fiber and one end welding of described second single-mode fiber.
6. mould field according to claim 5 adaptation, is characterized in that, expands core method described matched fiber and the core diameter of one end of described first single-mode fiber welding are increased to the first default core diameter by optical fiber; Expand core method by optical fiber and described second single-mode fiber and the core diameter of one end of described matched fiber welding are increased to the second default core diameter.
7. mould field according to claim 6 adaptation, is characterized in that, described optical fiber expansion core method comprises optical fiber and adds hot core expansion technology.
8. mould field according to claim 1 adaptation, is characterized in that, the core diameter of described first single-mode fiber is 10 microns, and the core diameter of described second single-mode fiber is 6 microns, and described matched fiber is SMF-28e optical fiber.
9. a fiber laser, it is characterized in that, comprise pumping source and laserresonator, described laserresonator comprises the first resonance section, gain fibre and the second resonance section, by the mould field adaptation coupling according to any one of claim 1-8 between described first resonance section and described gain fibre;
The pump light that described pumping source sends enters described gain fibre successively after described first resonance section after described second single-mode fiber, described matched fiber and described first single-mode fiber.
10. fiber laser according to claim 9, it is characterized in that, also be provided with described mould field adaptation between described second resonance section and described gain fibre, the flashlight that described gain fibre produces enters described second resonance section successively after described first single-mode fiber, described matched fiber and described second single-mode fiber.
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| CN107834352A (en) * | 2017-10-31 | 2018-03-23 | 大族激光科技产业集团股份有限公司 | Optical fiber mode fields matching process |
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Application publication date: 20160413 |