CN107834352A - Optical fiber mode fields matching process - Google Patents
Optical fiber mode fields matching process Download PDFInfo
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- CN107834352A CN107834352A CN201711047365.XA CN201711047365A CN107834352A CN 107834352 A CN107834352 A CN 107834352A CN 201711047365 A CN201711047365 A CN 201711047365A CN 107834352 A CN107834352 A CN 107834352A
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- Prior art keywords
- optical fiber
- fiber
- mfd
- mode
- matching process
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Classifications
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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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- 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
- G02B6/26—Optical coupling means
Abstract
The present invention relates to a kind of optical fiber mode fields matching process, for 1064nm wave bands high power optical fibre laser to be imported into the multimode gain fiber and outgoing laser beam that MFD is 18 μm from the single-mode fiber that MFD is 6 μm, characterized in that, welding has multistage transition optical fiber successively between the single-mode fiber that MFD is 6 μm and multimode gain fiber that MFD is 18 μm；Wherein, directions of the MFD of multistage transition optical fiber from single-mode fiber to multimode gain fiber is incremented by successively, and the MFD of transition optical fiber is more than 6 μm and less than or equal to 18 μm.Because directions of the multistage transition optical fiber MFD from single-mode fiber to multimode gain fiber is incremented by successively, variations in refractive index during multimode gain fiber is passed to so as to reducing laser beam by single-mode fiber, to reduce insertion loss and improve beam quality；Moreover, the optical fiber mode fields matching process effectively prevent, single-mode fiber is directly fused easily to form high temperature in multimode gain fiber in fusion point, so as to ensure the service life of optical fiber laser.
Description
Technical field
The invention belongs to laser assistance field, more particularly to a kind of optical fiber mode fields matching process.
Background technology
With the development of industrial laserses, especially there are the development advanced by leaps and bounds, optical-fiber laser utensil on optical fiber laser
There is the features such as small volume, caloric value are low, good beam quality and electrical efficiency are high.
Pulse optical fiber is to use all -fiber light path after first stage amplifier and two-stage amplifier, then through isolator
Mode will export after spot shaping.Wherein, two-stage amplifier is beam quality and the pump light conversion for determining laser final output
The Primary Component of efficiency.
However, the mould field between current first stage amplifier and two-stage amplifier matches the output light it is difficult to ensure that high quality
Beam, or even the beam quality M from two-stage amplifier output2More than 1.6, laser technology effect is thus directly affected.Moreover, mould
Field matching is bad to cause diode pumping conversion efficiency not high, and then influences Overall Power Consumption.
The content of the invention
Based on this, it is necessary to which it in 1064nm wave bands high power optical fibre laser is that 6 μm of single-mode fiber is led from MFD to provide a kind of
When entering the multimode gain fiber that MFD is 18 μm, reduce insertion loss and improve the optical fiber mode fields matching process of output beam quality.
A kind of optical fiber mode fields matching process, for by 1064nm wave bands high power optical fibre laser from MFD be 6 μm of single-mode optics
Fibre imported into the multimode gain fiber that MFD is 18 μm and outgoing laser beam, this method include：MFD be 6 μm single-mode fiber with
Welding has multistage transition optical fiber successively between the multimode gain fiber that MFD is 18 μm；Wherein, the MFD of transition optical fiber described in multistage
Incremented by successively from the direction of the single-mode fiber to the multimode gain fiber, the MFD of the transition optical fiber is more than 6 μm and is less than
Equal to 18 μm.
In one of the embodiments, the transition optical fiber close to the single-mode fiber takes the mode phase to fibre core welding
Even, the transition optical fiber close to the multimode gain fiber is taken is connected to the mode of covering welding.
In one of the embodiments, the transition optical fiber is three sections, respectively the first optical fiber, the second optical fiber and the 3rd light
It is fine.
In one of the embodiments, the mode to fibre core welding and the list are taken in the both ends of first optical fiber respectively
Mode fiber is connected with second optical fiber.
In one of the embodiments, the both ends of the 3rd optical fiber are taken to the mode of covering welding and described the respectively
Two optical fiber are connected with the multimode gain fiber.
In one of the embodiments, the MFD of first optical fiber, the MFD of second optical fiber and the 3rd optical fiber
MFD it is incremented by successively, and the MFD of first optical fiber is more than 6 μm, and the MFD of the 3rd optical fiber is less than or equal to 18 μm.
In one of the embodiments, the MFD of first optical fiber is 9 μm.
In one of the embodiments, the MFD of second optical fiber is 13 μm.
In one of the embodiments, the MFD of the 3rd optical fiber is 18 μm.
In one of the embodiments, in fusion process, the optical fiber of mutual welding pushes away in opposite directions towards fusion point each other
Enter 8 μm~13 μm.
Optical fiber mode fields matching process provided by the invention, during beam transmission, by the single-mode fiber that MFD is 6 μm
Exported into after multistage transition optical fiber, then from the multimode gain fiber that MFD is 18 μm, because multistage transition optical fiber MFD is by described
The direction of single-mode fiber to the multimode gain fiber is incremented by successively, and multimode gain is passed to by single-mode fiber so as to reduce laser beam
Variations in refractive index during optical fiber, to reduce splice loss, splice attenuation and improve beam quality；Moreover, the optical fiber mode fields matching process is effectively kept away
Exempted from single-mode fiber it is directly fused in multimode gain fiber easily fusion point formed high temperature, so as to ensure optical fiber laser
Service life.
Brief description of the drawings
Fig. 1 is that the mould field for entering multimode gain fiber by single-mode fiber that an embodiment provides matches schematic diagram.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give the better embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose for providing these embodiments is to make to understand more the disclosure
Add thorough and comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " interior ", " outer ", "left", "right" and
For illustrative purposes only, it is unique embodiment to be not offered as similar statement.
Refering to Fig. 1, a kind of optical fiber mode fields matching process of an embodiment, for 1064nm wave band high-power fibers to be swashed
Light is that 6 μm of single-mode fiber 10 imported into the multimode gain fiber 50 that MFD is 18 μm and exported from MFD (mode field diameter, similarly hereinafter)
Laser beam.It should be noted that in present embodiment, 1064nm wave band high power optical fibre lasers are as caused by optical fiber laser
Laser beam, that is to say, that single-mode fiber 10 is connected on the output end of optical fiber laser.Optical fiber mode fields matching process in the present embodiment
Including：Welding has multistage transition successively between the single-mode fiber 10 that MFD is 6 μm and multimode gain fiber 50 that MFD is 18 μm
Optical fiber；Wherein, the direction of the MFD of multistage transition optical fiber from single-mode fiber 10 to multimode gain fiber 50 is incremented by successively, transition light
Fine MFD is more than 6 μm and less than or equal to 18 μm.So, laser from MFD be that 6 μm of single-mode fiber 10 imported into transition optical fiber when,
Because the MFD of excessive optical fiber is between the MFD of single-mode fiber 10 and the MFD of multimode gain fiber 50, that is to say, that each section of optical fiber
Between variations in refractive index it is fainter, now laser beam pass through different optical fiber fusion point when, will not produce wide-angle refraction
And influence laser beam quality, therefore, it is this by 1064nm wave bands high power optical fibre laser from MFD be 6 μm of single-mode fiber
10 imported into MFD can cause from MFD for 18 μm of multimode gain fiber 50 and the optical fiber mode fields matching process of outgoing laser beam
Importeding into the laser beam that MFD is 18 μm for 6 μm of single-mode fibers 10 has preferable beam quality.Laser beam is additionally, since to wear
Cross that the refraction of different optical fiber fusion welding points is small, the light in laser beam will not be refracted and escape out optical fiber；Specifically, laser beam
Loss through fusion point is small, i.e., the optical fiber insertion loss of this optical fiber mode fields matching process is small, thus will not be produced in fusion point
Raw higher temperature, to ensure the service life of optical fiber laser.
Taken close to the transition optical fiber of single-mode fiber 10 and the mode of fibre core welding is connected, close to multimode gain fiber 50
Transition optical fiber is taken to be connected to the mode of covering welding.Because the MFD of single-mode fiber 10 is smaller, for close to single-mode fiber 10
Transition optical fiber is taken when can effectively ensure welding to fibre core welding, is had between single-mode fiber 10 and transition optical fiber higher
Axiality, so that light beam when laser beam passes through fusion point after refraction is more uniform in the radially offset of transition optical fiber, enter
And the laser beam through fusion point still has preferable linearity, the beam quality of laser beam ensure that.In present embodiment
In, between the transition optical fiber of multimode gain fiber 50, because the optical fiber MFD of mutual welding is larger, faint footpath during welding
Considerable influence will not be produced to the beam quality of laser beam, now by the way of to covering welding, simplify welding to offset
Process, to improve mould field matching efficiency.
It should be noted that in some concrete applications, transition optical fiber can be standard specification optical fiber at present on the market,
The optical fiber that can also be customized according to the actual requirements to supplier, therefore, in the present embodiment, the quantity and type of transition optical fiber
Number there are multiple choices, this is no longer going to repeat them.
As shown in figure 1, transition optical fiber is three sections, respectively the first optical fiber 20, the second optical fiber 30 and the 3rd optical fiber 40.Its
In, between the single-mode fiber 10 that MFD is 6 μm and multimode gain fiber 50 that MFD is 18 μm successively welding have the first optical fiber 20,
Second optical fiber 30 and the 3rd optical fiber 40.In this embodiment, the MFD of the first optical fiber 20, the second optical fiber 30 and the 3rd optical fiber 40
It is incremented by successively, and the MFD of the first optical fiber 20 is more than 6 μm, the MFD of the 3rd optical fiber 40 is less than or equal to 18 μm.
By the first optical fiber 20, the second optical fiber 30 and the welding of the 3rd optical fiber 40 in single-mode fiber 10 and multimode gain fiber 50
Between when, welding order is unrestricted, for example, the both ends of the first optical fiber 20 are first taken into the mode and list to fibre core welding respectively
Mode fiber 10 is connected with the second optical fiber 30.The mode and the second light to covering welding are taken into the both ends of the 3rd optical fiber 40 respectively again
Fibre 30 is connected with multimode gain fiber 50.One end of first optical fiber 20 can first with the welding of single-mode fiber 10, then by the first optical fiber
20 other end and the welding of the second optical fiber 30, are not limited thereto.
It should be noted that in above-mentioned embodiment, single-mode fiber 10 includes single-mode fiber covering 11 and positioned at single-mode optics
Single-mode fiber fibre core 12 in fine covering, the first optical fiber 20 include the first fibre cladding 21 and in the first fibre cladding the
One fiber core 22, the second optical fiber 30 include the second fibre cladding 31 and the second fiber core in the second fibre cladding
32, the 3rd optical fiber 40 includes the 3rd fibre cladding 41 and the 3rd fiber core 42 in the 3rd fibre cladding, multimode gain
Optical fiber 50 includes multimode gain fiber covering 51 and the multimode gain fiber fibre core 52 in multimode gain fiber covering.Upper
State to core welding and to that in covering fusion joining process, transition optical fiber can be fused into single mode respectively using rattan storehouse 80s heat sealing machines
Between optical fiber and multimode gain fiber, below will by taking the 80s heat sealing machines of rattan storehouse as an example (similarly hereinafter) to present embodiment in fusion joining process
Major parameter be described further.
Discharge time during 10 and first 20 welding of optical fiber of single-mode fiber is 12900ms~13100ms, the first optical fiber 20 with
Discharge time during the second 30 welding of optical fiber is 2400ms~2600ms, electric discharge when the second optical fiber 30 and the 3rd 40 welding of optical fiber
Time is 2900ms~3100ms, the 3rd optical fiber 40 and discharge time during 50 welding of multimode gain fiber for 4400ms~
4600ms。
Specifically, in some embodiments, single-mode fiber 10 is with discharge time during the first 20 welding of optical fiber
12900ms.Discharge time when the first optical fiber 20 and the second 30 welding of optical fiber is 2400ms.Second optical fiber 30 and the 3rd optical fiber 40
Discharge time during welding is 2900ms.3rd optical fiber 40 and discharge time during 50 welding of multimode gain fiber are 4400ms.
In other embodiments, discharge time during 10 and first 20 welding of optical fiber of single-mode fiber is 13100ms.The
Discharge time when one optical fiber 20 and the second 30 welding of optical fiber is 2600ms.Second optical fiber 30 and putting during the 3rd 40 welding of optical fiber
The electric time is 3100ms.3rd optical fiber 40 and discharge time during 50 welding of multimode gain fiber are 4600ms.
In some embodiments, discharge time during 10 and first 20 welding of optical fiber of single-mode fiber is 13000ms, first
Discharge time during 20 and second 30 welding of optical fiber of optical fiber is 2500ms, electric discharge when the second optical fiber 30 and the 3rd 40 welding of optical fiber
Time is 3000ms, and the 3rd optical fiber 40 and discharge time during 50 welding of multimode gain fiber are 4500ms.
Under the mould field that above-mentioned embodiment is matched, insertion loss can be controlled in 0.005dB~0.025dB, it is defeated
The beam quality M gone out2For 1.22~1.32, exported compared to laser beam directly is imported into multimode gain fiber 50 from single-mode fiber 10
Beam quality M afterwards2In 1.35~1.45 scope, the optical fiber mode fields matching process of present embodiment improves beam quality,
Insertion loss of the light beam in fusion point is reduced, avoids fusion point temperature too high and damages optical fiber laser.
It should be noted that in above-mentioned embodiment, the MFD of the first optical fiber 20 is 9 μm, and the MFD of the second optical fiber 30 is 13 μ
M, the MFD of the 3rd optical fiber 40 is 18 μm.The length of single-mode fiber 10 is 60mm, and the length of the first optical fiber 20 is 80mm, the second light
The length of fibre 30 is 80mm, and the length of the 3rd optical fiber 40 is 80mm, and the length of multimode gain fiber 50 is 400mm, not only can be with
The needs of welding are adapted to, while also reduce optical fiber consumptive material, it is cost-effective.In fusion process, the optical fiber of mutual welding each other it
Between promote 8 μm~13 μm in opposite directions towards fusion point, such as when one end of the first optical fiber 20 and single-mode fiber 10 are carried out into welding, make
The direction (i.e. towards fusion point direction) of first optical fiber 20 and single-mode fiber 10 towards each other promotes, and advance distance can be 8 μm, also may be used
To be 13 μm.It should be noted that in the present embodiment, in welding, the optical fiber of mutual welding is each other towards fusion point
Opposite to promote 15 μm, i.e., the lap between the optical fiber of mutual welding is 15 μm.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of optical fiber mode fields matching process, for by 1064nm wave bands high power optical fibre laser from the single-mode fiber that MFD is 6 μm
Imported into MFD be 18 μm multimode gain fiber and outgoing laser beam, it is characterised in that MFD be 6 μm single-mode fiber with
Welding has multistage transition optical fiber successively between the multimode gain fiber that MFD is 18 μm；Wherein, the MFD of transition optical fiber described in multistage
Incremented by successively from the direction of the single-mode fiber to the multimode gain fiber, the MFD of the transition optical fiber is more than 6 μm and is less than
Equal to 18 μm.
2. optical fiber mode fields matching process according to claim 1, it is characterised in that close to the transition light of the single-mode fiber
Fibre is taken to be connected to the mode of fibre core welding, and the mode to covering welding is taken close to the transition optical fiber of the multimode gain fiber
It is connected.
3. optical fiber mode fields matching process according to claim 2, it is characterised in that the transition optical fiber is three sections, respectively
For the first optical fiber, the second optical fiber and the 3rd optical fiber.
4. optical fiber mode fields matching process according to claim 3, it is characterised in that adopt respectively at the both ends of first optical fiber
Take and the mode of fibre core welding is connected with the single-mode fiber and second optical fiber.
5. optical fiber mode fields matching process according to claim 3, it is characterised in that adopt respectively at the both ends of the 3rd optical fiber
Take and the mode of covering welding is connected with second optical fiber and the multimode gain fiber.
6. optical fiber mode fields matching process according to claim 3, it is characterised in that the MFD of first optical fiber, described
The MFD of the MFD of two optical fiber and the 3rd optical fiber is incremented by successively, and the first optical fiber MFD is more than 6 μm, the 3rd optical fiber
MFD is less than or equal to 18 μm.
7. optical fiber mode fields matching process according to claim 6, it is characterised in that the MFD of first optical fiber is 9 μm.
8. optical fiber mode fields matching process according to claim 6, it is characterised in that the MFD of second optical fiber is 13 μm.
9. optical fiber mode fields matching process according to claim 6, it is characterised in that the MFD of the 3rd optical fiber is 18 μm.
10. according to the optical fiber mode fields matching process described in claim any one of 1-9, it is characterised in that in fusion process, phase
The optical fiber of mutual welding promotes 8 μm~13 μm towards fusion point in opposite directions each other.
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| CN201711047365.XA CN107834352A (en) | 2017-10-31 | 2017-10-31 | Optical fiber mode fields matching process |
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| CN201711047365.XA CN107834352A (en) | 2017-10-31 | 2017-10-31 | Optical fiber mode fields matching process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630888A (en) * | 2020-12-22 | 2021-04-09 | 光越科技(深圳)有限公司 | Mode field conversion system |
| CN114839720A (en) * | 2022-05-06 | 2022-08-02 | 长沙大科光剑科技有限公司 | Output head with mode field converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112630888A (en) * | 2020-12-22 | 2021-04-09 | 光越科技(深圳)有限公司 | Mode field conversion system |
| CN114839720A (en) * | 2022-05-06 | 2022-08-02 | 长沙大科光剑科技有限公司 | Output head with mode field converter |
| CN114839720B (en) * | 2022-05-06 | 2024-03-08 | 长沙大科光剑科技有限公司 | Output head with mode field converter |
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