CN106911059B - All optical fibre structure 980nm wave band high-power fiber oscillator - Google Patents
All optical fibre structure 980nm wave band high-power fiber oscillator Download PDFInfo
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- CN106911059B CN106911059B CN201710102903.4A CN201710102903A CN106911059B CN 106911059 B CN106911059 B CN 106911059B CN 201710102903 A CN201710102903 A CN 201710102903A CN 106911059 B CN106911059 B CN 106911059B
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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
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094007—Cladding pumping, i.e. pump light propagating in a clad surrounding the active core
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Abstract
The invention discloses a kind of all optical fibre structure 980nm wave band high-power fiber oscillators, it is therefore an objective to solve the problems, such as that existing 980nm fiber oscillator device electrical efficiency is lower and coupling pump light is limited.The present invention is made of gain module, two pump modules, two optical fiber mode fields adapters, two light-sensitive optical fibres, two fiber gratings and output coupling end.Gain module is made of pump coupling module and Double Cladding Ytterbium Doped Fiber, and pump coupling module uses 2 side-pumping bundling devices or K multimode fibre；Two pump modules include multiple pumping submodules, and each pumping submodule is the semiconductor laser of tail optical fiber output 900nm~960nm wave band or closes binding structure；Two optical fiber mode fields adapters are using an optical fiber mode fields adapter or use sub-optical fibre mould field adapter cascaded structure；The central wavelength for the fiber grating inscribed in light-sensitive optical fibre is respectively positioned on laser wavelength.The present invention solves the problems, such as that existing 980nm fiber oscillator device electrical efficiency is lower and coupling pump light is limited.
Description
Technical field
The present invention relates to a kind of fiber oscillator devices more particularly to a kind of service band near 980nm (970nm~
The high-power fiber oscillator of all optical fibre structure 985nm).
Background technique
Optical fiber laser is with its excellent heat dissipation characteristics, good beam quality and low manufacture cost, compact-sized etc.
Advantage, it has also become the new lover of laser family has obtained the extensive concern of people.With the development of fiber laser technology, function
Rate level is continuously improved, and application field is gradually extended to laser and beats from fields such as the fiber optic communication of early stage, sensing, measurements
The fields such as print, industrial processes, medical treatment, military affairs.With the continuous expansion that optical fiber laser is applied, 980nm wave band of laser light source is made
For a kind of important pump light source of optical fiber laser, more and more important angle also is play in each application field of optical fiber laser
Color.
At this stage, the most commonly used 980nm wave band pump light source is 980nm wave band semiconductor laser.But, semiconductor
The limit of brightness of laser has become the key restriction factors of optical fiber laser power ascension, meanwhile, high power semiconductor swashs
The spectrum stability of light device is more sensitive for temperature, this is also applied to bring certain influence.In order to overcome semiconductor to swash
The deficiency of light device, people start to consider using the optical fiber laser of same wave band as pump light source, Lai Tisheng pump light source it is bright
Therefore degree, 980nm wave band optical fiber laser also receive the extensive concern of people.In addition, 980nm wave band optical fiber laser is another
One important application is exactly that the blue laser output of the 490nm wave band of high brightness is realized by frequency multiplication, substitutes heavy argon laser
Device.Just because of its potential application value, the optical fiber laser of 980nm wave band has become the research heat in optical fiber laser field
One of point.
Currently, the gain fibre that can be used for 980nm optical fiber laser is Yb dosed optical fiber, Yb dosed optical fiber is also Gao Gong at this stage
The preferred gain fibre of rate optical fiber laser；But Yao Shixian high brightness 980nm optical fiber laser is not a nothing the matter
Feelings, this is determined by the level characteristic of ytterbium ion.The level structure of ytterbium ion determines that 980nm ytterbium-doping optical fiber laser is one
A three-level laser, pumping threshold with higher, amplified spontaneous emission effect are also very serious.Therefore, based on existing
It is defeated that Conventional band (1030nm~1090nm wave band) ytterbium-doping optical fiber laser scheme is difficult to realize efficient 980nm wave band of laser
Out.How to realize that high power, efficient 980nm ytterbium-doping optical fiber laser become the emphasis of related fields concern.
At this stage, the constructing plan of 980nm wave band optical fiber laser can be divided into amplifier and two kinds of oscillator.Amplifier
Scheme mainly using 980nm wave band semiconductor laser as seed light source, then utilize 980nm band optical fiber amplifier into
The 980nm wave band of laser output of high-power high-efficiency is realized in row power amplification.Since the program is still made using semiconductor laser
For seed light source, insufficient in terms of brightness and spectrum stability of semiconductor laser can beam quality and light to output beam
Spectral property causes large effect.Therefore, if can undoubtedly be mentioned using 980nm wave band optical fiber oscillator alternative semiconductors laser
Rise the performance of entire Optical Maser System.
At this stage, the scheme of 980nm wave band optical fiber oscillator mainly uses single mode or few mould Yb dosed optical fiber, is pumped by fibre core
What the mode at Pu was realized.The problem of such scheme, is: the diameter and numerical value aperture ratio of single mode or few mould Yb dosed optical fiber fibre core compared with
Small, this greatly limits the couplings of pump light.Currently, be applied to the Optical Maser System pump mode there are mainly two types of: one
Kind is directly pumped using the semiconductor laser of 900nm~940nm wave band, and this scheme is limited to the bright of semiconductor laser
Degree, the output power of oscillator can only achieve a watt magnitude；Another pump scheme is the optical fiber using 920nm~940nm wave band
Laser (such as: Nd-doped fiber laser) is used as pump light source, to promote brightness and the power of pump light source, to improve oscillation
The output power of device system.Although the latter can promote the output power of fiber oscillator device system to a certain extent, by
The shorter semiconductor laser of wavelength is also needed (such as: Nd-doped fiber laser in the optical fiber laser of 920nm~940nm wave band
Device needs 808nm wave band semiconductor laser) it is pumped, this quantum for undoubtedly increasing fiber oscillator device system entirety loses
Damage, greatly reduces the electro-optical efficiency of Optical Maser System.In order to solve the contradiction between power ascension and efficiency, the patent No.
980nm wave band is proposed for " all optical fibre structure 980nm wave band Compound Cavity single mode fiber laser " of ZL201310749840.3
The Compound Cavity scheme of optical fiber laser, the program directly pump the quantity of oscillator module by expanding semiconductor laser, come
The delivery efficiency of entire Optical Maser System is promoted, to realize power expansion under the premise of guaranteeing electro-optical efficiency.No
It crosses, program structure is complex, meanwhile, the quantity expansion of oscillator module is also subject to certain restrictions, so that system is whole
Body delivery efficiency is confined to hectowatt magnitude.
The scheme of existing 980nm wave band optical fiber oscillator is summarized, key problem is to have used fibre core pumping configuration,
Significantly limit the power of pump light.One of the method for solving the problems, such as this is exactly to use Double Cladding Ytterbium Doped Fiber, how sharp
Become those skilled in the art pole with the 980nm wave band of laser system that Double Cladding Ytterbium Doped Fiber constructs efficient all optical fibre structure
The problem of to pay close attention to.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing 980nm fiber oscillator device, provide a kind of based on double
The all optical fibre structure 980nm wave band high-power fiber oscillator that cladded-fiber and semiconductor laser directly pump.By using
Semiconductor laser directly pumps rather than fibre core pumping configuration, solves the electro-optic conversion effect of existing fiber oscillator pump scheme
The lower problem of rate；By using the cladding pumping technique of doubly clad optical fiber, solves fibre core and pump faced coupling pump light
Limited problem.
The technical scheme is that
The present invention is by gain module, the first pump module, the second pump module, the first optical fiber mode fields adapter, the second light
Fine mould field adapter, the first light-sensitive optical fibre, the first fiber grating, the second light-sensitive optical fibre, the second fiber grating and output coupling end
Composition.First pump module and the second pump module are connected with the pumping light input end of gain module respectively.First optical fiber mode fields
The input terminal of adapter and the second optical fiber mode fields adapter is connected with the signal light output end of gain module respectively.First optical fiber mode
The output end of field adapter is connected with the input terminal of the first light-sensitive optical fibre.The output end and the second light of second optical fiber mode fields adapter
The input terminal of quick optical fiber is connected.The first fiber grating is inscribed in the fibre core of first light-sensitive optical fibre, in the fibre core of the second light-sensitive optical fibre
Inscribe the second fiber grating.The input terminal at output coupling end is connected with the output end of the second light-sensitive optical fibre.Different devices in the present invention
Connection between part is to fetch realization by optical fiber welding.
Gain module of the invention is made of pump coupling module and Double Cladding Ytterbium Doped Fiber, and pump light is through pump coupling mould
Block, from the side surface coupling of Double Cladding Ytterbium Doped Fiber inner cladding into Double Cladding Ytterbium Doped Fiber, and to Double Cladding Ytterbium Doped Fiber fibre core
In ytterbium ion pumped, to generate the light field of 980nm wave band.The fibre core cladding diameter ratio of Double Cladding Ytterbium Doped Fiber is (i.e.
Core diameter is divided by inner cladding diameter) it should be greater than being equal to 30%.
Two kinds of technical solutions can be used in pump coupling module.Technical solution one as shown in Fig. 2, pump coupling module by first
Side-pumping bundling device and the second side are formed to pump combiner, and the first side-pumping bundling device and the second side are to pump combiner
It is the inner cladding side by pump light via doubly clad optical fiber, the optical fibre device being coupled in the inner cladding of doubly clad optical fiber,
Comprising being no less than 1 pumping light input end, 1 signal light input end and 1 output end, such as: document " Thomas Theeg,
Hakan Sayinc,Neumann,Ludger Overmeyer,Dietmar Kracht,Pump and signal
Combiner for bi-directional pumping of all-fiber lasers and amplifiers (all -fiber
The pump signal bundling device of laser and amplifier), Optics Express (optical communication), 2012,20 phases, volume 27, the
28125-28141 pages " in " side-pump combiner " (side-pumping bundling device) knot described in second part and Fig. 1
The quantity of structure, the first side-pumping bundling device and the second side to the pumping light input end of pump combiner can be equal, can also be with
It is unequal.The signal light input end of first side-pumping bundling device and the second side are to the signal light input end of pump combiner
2 signal light input ends of pump coupling module；The output end of first side-pumping bundling device and the second side are to pump combiner
Output end be pump coupling module 2 output ends；N number of pumping light input end of first side-pumping bundling device and second
M pumping light input end of side-pumping bundling device is the pumping light input end (total N+M) of pump coupling module.First side
Phase is distinguished to the output end of pump combiner and the second side to the output end of pump combiner and the both ends of Double Cladding Ytterbium Doped Fiber
Even, N+M of pump coupling module pumps the pumping light input end that light input end is gain module, and the 2 of pump coupling module
A signal light input end is 2 signal light output ends of gain module.N is that the pump light of the first side-pumping bundling device inputs
Number is held, M is pumping light input end number of second side to pump combiner, and M, N are positive integer.
Technical solution two as shown in Figure 3 can also be used in pump coupling module, that is, uses K multimode fibre, so that K more
(K should be is less than or equal to [π (1+R to the fibre core and Double Cladding Ytterbium Doped Fiber inner cladding optical contact of mode fiber1/r1)] natural number,
Wherein, R1For Double Cladding Ytterbium Doped Fiber inner cladding diameter, r1For the minimum core diameter of multimode fibre), in this way, pump coupling mould
The pump light transmitted in K multimode fibre of block can be coupled to double clad and be mixed by optical contacts modes such as evanescent wave couplings
In ytterbium optical fiber inner cladding, to pump the light field that the ytterbium ion in Double Cladding Ytterbium Doped Fiber fibre core generates 980nm wave band.In the party
In case, the both ends of K multimode fibre of pump coupling module are the pumping light input end of gain module (total 2K), double clad
The both ends of Yb dosed optical fiber are 2 signal light output ends of gain module.
First pump module and the second pump module of the invention includes multiple pumping submodules, the first pump module and
The quantity of the pumping submodule of second pump module and the quantity that should be less than the pumping light input end equal to pump coupling module, pump
The pump light input terminal quantity of Pu coupling module first scheme is (N+M), and the pump light input terminal quantity of alternative plan is 2K.Pump
Pu submodule can select the semiconductor laser (embodiment one as shown in Figure 2 of tail optical fiber output 900nm~960nm wave band
In pumping submodule 211-216), at this point, the tail optical fiber of semiconductor laser be pump submodule output optical fibre；It can also be with
Using well known conjunction binding structure, i.e., the tail optical fiber output semiconductor laser of multiple tail optical fibers output 900nm~960nm wave band is passed through
At least one fiber pump combiner closes beam into an output optical fibre (as pumping the output optical fibre of submodule) (such as Fig. 3 institute
Show the pumping submodule 211 in embodiment two).The output optical fibre for constituting all pumping submodules of the first pump module is
The output optical fibre of one pump module, the output optical fibre for constituting all pumping submodules of the second pump module is the second pumping mould
The output optical fibre of block.The output optical fibre of first pump module is connected with gain module pumping light input end (if pump coupling module
Using first scheme, the output optical fibre of the first pump module is connected with N number of pumping light input end of gain module, if pump coupling
Module uses alternative plan, and the output optical fibre of the first pump module is connected with K pumping light input end of gain module), second
The output optical fibre of pump module and gain module pumping light input end be connected (if pump coupling module using first scheme, second
The output optical fibre of pump module is connected with the another M pumping light input end of gain module, if pump coupling module uses second party
Case, the output optical fibre of the second pump module are connected with the another K pumping light input end of gain module).First pump module and
The diameter of the output optical fibre of two pump modules should be less than the diameter equal to gain module pump light input end fiber；First pumping mould
The numerical aperture of the output optical fibre of block should be less than the numerical aperture equal to gain module pump light input end fiber.
Second pump module of the invention can be identical as the structure of the first pump module, can also be different.I.e. first pumping
When module exports the semiconductor laser of 900nm~960nm wave band using tail optical fiber, the second pump module can be tail optical fiber output
The semiconductor laser of 900nm~960nm wave band is also possible to close binding structure；When first pump module is using binding structure is closed, the
Two pump modules can be the semiconductor laser of tail optical fiber output 900nm~960nm wave band, be also possible to close binding structure.
The input terminal of first optical fiber mode fields adapter is connected with the signal light output end of gain module, it is desirable that the first optical fiber mode
The diameter of field adapter input end fiber fibre core is equal with the diameter of gain module signal light output end fiber core；First optical fiber
The output end of mould field adapter is connected with the first light-sensitive optical fibre input terminal, it is desirable that the first mould field adapter output end fiber core
Diameter is equal with the diameter of the first light-sensitive optical fibre input terminal fibre core.It is suitable that an optical fiber mode fields can be used in first optical fiber mode fields adapter
Orchestration can also use sub-optical fibre mould field adapter cascaded structure, concatenated sub-optical fibre mould field in the first optical fiber mode fields adapter
Adapter number is Q1, sub-optical fibre mould field adapter cascaded structure refer to the output end of i-th of sub-optical fibre mould field adapter and
The input terminal of the sub- optical fiber mode fields adapter of i+1 is connected, and requires the output end fibre core of i-th of sub-optical fibre mould field adapter straight
Diameter is equal with the i+1 input terminal core diameter of sub- optical fiber mode fields adapter, i=1,2 ... ..., Q-1, and Q is concatenated sub-light
The number of fine mould field adapter, for the first optical fiber mode fields adapter, Q=Q1.The input terminal of 1st sub- optical fiber mode fields adapter
The as input terminal of the first optical fiber mode fields adapter, Q1The output end of a sub- optical fiber mode fields adapter is the first optical fiber mode fields
The output end of adapter, Q1It should be less than being equal to 10, it is preferable that be less than or equal to 5.
The input terminal of second optical fiber mode fields adapter is connected with the signal light output end of gain module, it is desirable that the second optical fiber mode
The diameter of field adapter input end fiber fibre core is equal with the diameter of gain module signal light output end fiber core；Second optical fiber
The output end of mould field adapter is connected with the second light-sensitive optical fibre input terminal, it is desirable that the second mould field adapter output end fiber core
Diameter is equal with the diameter of the second light-sensitive optical fibre input terminal fibre core.Second optical fiber mode fields adapter, which combines, to be needed, and can be used one
Optical fiber mode fields adapter can also use sub-optical fibre mould field adapter cascaded structure, concatenated in the second optical fiber mode fields adapter
Sub-optical fibre mould field adapter number is Q2, (Q2For natural number, Q2It can be with Q1It is equal, can also be unequal, Q2It should be less than being equal to 10,
It is preferably less than and is equal to 5), the input terminal of the 1st sub- optical fiber mode fields adapter is the input of the second optical fiber mode fields adapter
End, Q2The output end of a sub- optical fiber mode fields adapter is the output end of the second optical fiber mode fields adapter.For the second optical fiber
Mould field adapter, Q=Q2。
Optical fiber mode fields adapter primarily serves two effects: first is that realizing that Double Cladding Ytterbium Doped Fiber fibre core and light-sensitive optical fibre are fine
Mould field matching and the connection of low damage between core, in 980nm wave band optical fiber oscillator, the core diameter of the doubly clad optical fiber used
Often larger, this brings difficulty to the inscription of fiber grating, and therefore, the diameter for inscribing the light-sensitive optical fibre of fiber grating is often wanted
Less than the fibre core of doubly clad optical fiber, in order to realize the matching of the mould field between two fibre cores and the connection of low damage, need to be adapted to using mould field
Device；Second is that the mode quantity in laser can be reduced using mould field adapter, be conducive to the beam quality for promoting output laser.
The central wavelength for the first fiber grating inscribed in first light-sensitive optical fibre should be located at laser wavelength, it may be assumed that and 970nm~
985nm wave band, and should be greater than being equal to 90% in the reflectivity of central wavelength, Sidelobe Suppression ratio should be greater than being equal to 20dB.First light
The output end of quick optical fiber should inhibit fiber end face for the reflection of light field, can be used but be not limited to common oblique angle cutting.
The central wavelength for the second fiber grating inscribed in second light-sensitive optical fibre should be approximately equal with the first fiber grating (inclined
Difference should be less than being equal to 1nm), and should be greater than being equal to 10% in the reflectivity of central wavelength, Sidelobe Suppression ratio should be greater than being equal to 25dB.
The input terminal at output coupling end is connected with the output end of the second light-sensitive optical fibre, and the input end fiber at output coupling end is answered
It is equal with the output end fibre core diameter of the second light-sensitive optical fibre.Its structure can be used but be not limited to the oblique angle cutting of fiber end face
Or end cap.
Following technical effect can achieve using the present invention:
1. the present invention realizes the high power 980nm wave band optical fiber oscillator of all-fiber, straight using semiconductor laser
Pumping is connect, the electro-optical efficiency of oscillator is improved；
2. the present invention breaches existing oscillator scheme by using Double Cladding Ytterbium Doped Fiber and lateral cladding pumping structure
Fibre core pumps the limitation for pumping light power；
3. ensure that the pumping efficiency of oscillator by the fibre core covering ratio for improving Double Cladding Ytterbium Doped Fiber；
4. by introducing mould field adapter, light-sensitive optical fibre needed for the big fibre core and fiber grating for solving Yb dosed optical fiber are inscribed
Contradiction between fibre core is smaller also improves the delivery efficiency of output laser while realizing light field low damage transmission；
5. passing through the end face processing of fiber grating and light-sensitive optical fibre, inhibit the amplified spontaneous emission of 1030nm wave band for vibration
Swing the influence of device.
6. the technical solution structure is simple, it can be achieved that the 980nm wave band of laser of kilowatt magnitude exports, light light conversion efficiency is big
In 50%.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of all -fiber 980nm wave band optical fiber oscillator of the present invention.
Fig. 2 is the structural schematic diagram of all -fiber 980nm wave band optical fiber oscillator embodiment one of the present invention.
Fig. 3 is the structural schematic diagram of all -fiber 980nm wave band optical fiber oscillator embodiment two of the present invention.
Fig. 4 is the structural schematic diagram of optical fiber mode fields adapter in inventive embodiments two.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
As shown in Figure 1, the present invention is by gain module 10, the first pump module 21, the second pump module 22, the first optical fiber mode
Adapter 31, the second optical fiber mode fields adapter 32, the first light-sensitive optical fibre 41, the first fiber grating 51, the second light-sensitive optical fibre 42,
Second fiber grating 52 and output coupling end 60 form.First pump module 21 and the second pump module 22 respectively with gain module
10 pumping light input end is connected.The input terminal of first optical fiber mode fields adapter 31 and the second optical fiber mode fields adapter 32 respectively with
The signal light output end of gain module 10 is connected.The output end of first optical fiber mode fields adapter 31 is defeated with the first light-sensitive optical fibre 41
Enter end to be connected.The output end of second optical fiber mode fields adapter 32 is connected with the input terminal of the second light-sensitive optical fibre 42.First photosensitive light
The first fiber grating 51 is inscribed in the fibre core of fibre 41, the second fiber grating 52 is inscribed in the fibre core of the second light-sensitive optical fibre 42.Output
The input terminal of coupled end 60 is connected with the output end of the second light-sensitive optical fibre 42.
Gain module 10 of the invention is made of pump coupling module 11 and Double Cladding Ytterbium Doped Fiber 12, and pump light is through pumping
Coupling module 11, from the side surface coupling of 12 inner cladding of Double Cladding Ytterbium Doped Fiber into Double Cladding Ytterbium Doped Fiber 12, and to double clad
Ytterbium ion in 12 fibre core of Yb dosed optical fiber is pumped, to generate the light field of 980nm wave band.The fibre of Double Cladding Ytterbium Doped Fiber 12
Core covering diameter ratio (i.e. core diameter is divided by inner cladding diameter) should be greater than being equal to 30%.
Two kinds of technical solutions can be used in pump coupling module 11.Technical solution one as shown in Fig. 2, pump coupling module 11 by
First side-pumping bundling device 111 and the second side are formed to pump combiner 112, the first side-pumping bundling device 111 and second
Side-pumping bundling device 112 is the inner cladding side by pump light via doubly clad optical fiber, is coupled to the interior of doubly clad optical fiber
Optical fibre device in covering includes no less than 1 pumping light input end, 1 signal light input end and 1 output end, the first side
Can be equal to the quantity of the pumping light input end of pump combiner 112 to pump combiner 111 and the second side, it can not also phase
Deng.The signal light input end 11101 of first side-pumping bundling device 111 and the signal light of the second side to pump combiner 112 are defeated
Enter 2 signal light input ends that end 11201 is pump coupling module 11；The output end of first side-pumping bundling device 111
11102 and second side to the output end 11202 of pump combiner 112 be pump coupling module 11 2 output ends；First side
To the pumping light input end (1111-111N) of pump combiner 111, (it is the first side-pumping bundling device 111 that N, which is 6, N, in Fig. 2
Pump light input end number) and pumping light input end (1121-112M) from the second side to pump combiner 112 (in Fig. 2 M be 6, M
Be the second side to the pumping light input end number of pump combiner 112) be the pumping light input end of pump coupling module 11 (altogether
N+M).The output end 11202 of the output end 11102 of first side-pumping bundling device 111 and the second side to pump combiner 112
It is connected with the both ends of Double Cladding Ytterbium Doped Fiber 12, the pumping light input end of pump coupling module 11 is the pumping of gain module 10
Light input end (total N+M), 2 signal light input ends of pump coupling module 11 are that 2 signal lights of gain module 10 are defeated
Outlet.
Technical solution two as shown in Figure 3 can also be used in pump coupling module 11, that is, uses K multimode fibre, so that K
(K should be is less than or equal to [π (1+R to the fibre core and 12 inner cladding optical contact of Double Cladding Ytterbium Doped Fiber of multimode fibre1/r1)] nature
Number, wherein R1For 12 inner cladding diameter of Double Cladding Ytterbium Doped Fiber, r1For the minimum core diameter of multimode fibre), in this way, pumping coupling
The pump light transmitted in K multimode fibre of block 11 is molded, can be coupled to double by optical contacts modes such as evanescent wave couplings
In 12 inner cladding of covering Yb dosed optical fiber, so that the ytterbium ion pumped in 12 fibre core of Double Cladding Ytterbium Doped Fiber generates 980nm wave band
Light field.In this scenario, the both ends of K multimode fibre of pump coupling module 11 are the pumping light input end of gain module 10
(total 2K), the both ends of Double Cladding Ytterbium Doped Fiber 12 are 2 signal light output ends of gain module 10.
First pump module 21 of the invention includes multiple pumping submodules, and the quantity for pumping submodule should be less than being equal to N
(when pump coupling module 11 is using first scheme) or K (when pump coupling module 11 is using alternative plan), pump coupling
The pump light input terminal quantity of 11 first scheme of module is (N+M), and the pump light input terminal quantity of alternative plan is 2K.Pumping
Module can select the semiconductor laser of tail optical fiber output 900nm~960nm wave band (in embodiment one as shown in Figure 2
Pump submodule 211-216), at this point, the tail optical fiber of semiconductor laser is the output optical fibre for pumping submodule；It can also use
Well known conjunction binding structure, i.e., by the tail optical fiber output semiconductor laser of multiple tail optical fibers output 900nm~960nm wave band by least
It is (real as shown in Figure 3 into an output optical fibre (as pumping the output optical fibre of submodule) that one fiber pump combiner closes beam
Apply the pumping submodule 211 in example two).The output optical fibre for constituting all pumping submodules of the first pump module 21 is first
The output optical fibre of pump module 21.The output optical fibre of first pump module 21 is defeated with 10 pump light input end fiber of gain module
Enter optical fiber to be connected (if pump coupling module 11 uses first scheme, the output optical fibre and gain module 10 of the first pump module 21
N number of pump light input end fiber be connected, if pump coupling module 11 use alternative plan, the output light of the first pump module 21
Fibre is connected with K pump light input end fiber of gain module 10).The diameter of the output optical fibre of first pump module 21 should be less than
Equal to the diameter of 10 pump light input end fiber of gain module；The numerical aperture of the output optical fibre of first pump module 21 should be less than
Equal to the numerical aperture of 10 pump light input end fiber of gain module.
Second pump module 22 of the invention includes multiple pumping submodules, and the quantity for pumping submodule should be less than being equal to M
(when pump coupling module 11 is using first scheme) or K (when pump coupling module 11 is using alternative plan).Each pumping
Submodule is made of the semiconductor laser of tail optical fiber output 900nm~960nm wave band.Pumping submodule can select a tail
The semiconductor laser (the pumping submodule 221-226 in embodiment one as shown in Figure 2) of fibre output 900nm~960nm wave band,
At this point, the tail optical fiber of semiconductor laser is the output optical fibre for pumping submodule；Well known conjunction binding structure can also be used, i.e., will
The tail optical fiber output semiconductor laser of multiple tail optical fiber output 900nm~960nm wave bands passes through at least one fiber pump combiner
Close beam (second pumping in embodiment two as shown in Figure 3 into an output optical fibre (as pumping the output optical fibre of submodule)
Submodule 221).The output optical fibre for constituting all pumping submodules of the second pump module 22 is the defeated of the second pump module 22
Optical fiber out.The output optical fibre of second pump module 22 is connected with 10 pump light input end fiber of gain module (if pump coupling mould
Block 11 uses first scheme, the output optical fibre of the second pump module 22 and the another M pump light input end fiber of gain module 10
It is connected, if pump coupling module 11 uses alternative plan, the output optical fibre of the second pump module 22 and the another K of gain module 10 are a
Pump light input end fiber is connected).The diameter of the output optical fibre of second pump module 22 should be less than being equal to the pumping of gain module 10
The diameter of light input end optical fiber；The numerical aperture of the output optical fibre of second pump module 22 should be less than being equal to the pumping of gain module 10
The numerical aperture of light input end optical fiber.
The input terminal of first optical fiber mode fields adapter 31 is connected with the signal light output end of gain module 10, it is desirable that the first light
The diameter of fine 31 input end fiber fibre core of mould field adapter is equal with the diameter of 10 signal light output end fiber core of gain module；
The output end of first optical fiber mode fields adapter 31 is connected with 41 input terminal of the first light-sensitive optical fibre, it is desirable that the first mould field adapter 31 is defeated
The diameter of outlet fiber core is equal with the diameter of 41 input terminal fibre core of the first light-sensitive optical fibre.First optical fiber mode fields adapter 31 can
Using an optical fiber mode fields adapter, Q can also be used1A sub- optical fiber mode fields adapter cascaded structure is (i.e. by i-th of sub-optical fibre
The output end of mould field adapter is connected with the input terminal of the sub- optical fiber mode fields adapter of i+1, and requires i-th of sub-optical fibre mould field
The output end core diameter of adapter is equal with the i+1 input terminal core diameter of sub- optical fiber mode fields adapter, i=1,
2 ... ..., Q1- 1, Q1For natural number, the input terminal of the 1st sub- optical fiber mode fields adapter is the first optical fiber mode fields adapter 31
Input terminal, Q1The output end of a sub- optical fiber mode fields adapter is the output end of the first optical fiber mode fields adapter 31, Q1It should be less than
Equal to 10, it is preferable that be less than or equal to 5).
The input terminal of second optical fiber mode fields adapter 32 is connected with the signal light output end of gain module 10, it is desirable that the second light
The diameter of fine 32 input end fiber fibre core of mould field adapter is equal with the diameter of 10 signal light output end fiber core of gain module；
The output end of second optical fiber mode fields adapter 32 is connected with 42 input terminal of the second light-sensitive optical fibre, it is desirable that the second mould field adapter 32 is defeated
The diameter of outlet fiber core is equal with the diameter of 42 input terminal fibre core of the second light-sensitive optical fibre.Second optical fiber mode fields adapter, 32 knot
It closes and needs, an optical fiber mode fields adapter can be used, Q can also be used2A sub- optical fiber mode fields adapter cascaded structure (Q2For certainly
So number, Q2It can be with Q1It is equal, can also be unequal, Q2It should be less than being equal to 10, it is preferable that be less than or equal to 5).
The central wavelength for the first fiber grating 51 inscribed in first light-sensitive optical fibre 41 should be located at laser wavelength, it may be assumed that 970nm
~985nm wave band, and should be greater than being equal to 90% in the reflectivity of central wavelength, Sidelobe Suppression ratio should be greater than being equal to 20dB.First
The output end of light-sensitive optical fibre 41 should inhibit fiber end face for the reflection of light field, can be used but be not limited to common oblique angle cutting.
The central wavelength for the second fiber grating 52 inscribed in second light-sensitive optical fibre 42 should be approximate with the first fiber grating 51
Equal (deviation should be less than 1nm), and should be greater than being equal to 10% in the reflectivity of central wavelength, Sidelobe Suppression ratio should be greater than being equal to
25dB。
The input terminal at output coupling end 60 is connected with the output end of the second light-sensitive optical fibre 42, the input terminal at output coupling end 60
Optical fiber should be equal with the output end fibre core diameter of the second light-sensitive optical fibre 42.Its structure can be used but be not limited to fiber end face
Oblique angle cutting or end cap.
Fig. 2 gives the embodiment of the present invention one.The Double Cladding Ytterbium Doped Fiber 12 that the gain module 10 of the embodiment is selected
Fibre core cladding diameter than 30%；Pump coupling module 11 uses technical solution one, that is, selects 2 to have 6 pump light inputs
The side-pumping bundling device (i.e. N=M=6) at end.First pump module 21 includes 6 pumping submodule 211-216, each pumping
Submodule is all made of a semiconductor laser with tail optical fiber.Second pump module 22 also includes 6 pumping submodule 221-
226, each pumping submodule is made of a semiconductor laser with tail optical fiber.First optical fiber mode fields adapter 31 and second
The structure having the same of optical fiber mode fields adapter 32 is connected in series (i.e. Q by 2 sub- optical fiber mode fields adapters1=Q2=2).Under
The structure of optical fiber mode fields adapter is introduced in face by taking the first optical fiber mode fields adapter 31 as an example, as shown in figure 4, the first optical fiber mode fields are suitable
Orchestration 31 is made of the first sub-optical fibre mould field adapter 311 and the second sub-optical fibre mould field adapter 312；First sub-optical fibre mould field is suitable
The output end of orchestration 311 is connected with the input terminal of the second sub-optical fibre mould field adapter 312.First light-sensitive optical fibre 41 and second is photosensitive
The structure having the same of optical fiber 42,51 central wavelength of the first fiber grating are 978nm, and the reflectivity of central wavelength is 90%, other
Valve inhibits than being 20dB；Second fiber grating, 52 central wavelength is 977.9nm, and the reflectivity of central wavelength is 25%, secondary lobe suppression
System is than being 45dB.Using the output end of the second light-sensitive optical fibre 42 cutting bevel as output coupling end 60.Embodiment one is pumping
In the case that module 21 and pump module 22 can provide 900W pump light, it can reach in the power of 980nm wave band output laser
990W, light light conversion efficiency are 55%, and electro-optical efficiency can reach 25%.
Fig. 3 gives the embodiment of the present invention two.The Double Cladding Ytterbium Doped Fiber that the gain module 10 of the embodiment is selected
Fibre core cladding diameter ratio is 50%；Pump coupling module 11 uses technical solution two, that is, uses a multimode fibre (K=1), with
Double Cladding Ytterbium Doped Fiber 12 constitutes profile pump Yb dosed optical fiber, and the first pump module 21 includes a pumping submodule 211, pumping
Submodule closes beam through 7 × 1 fiber pump combiners 2118 by seven semiconductor laser 2111-2117 with tail optical fiber and constitutes.The
Two pump modules 22 include a pumping submodule 221, by seven semiconductor laser 2211-2217 with tail optical fiber through 7 × 1 light
Fine bundling device 2218 closes beam and constitutes.First pump module 21 and the second pump module 22 can provide 700W pump light.First light
Fine mould field adapter 31 and the structure having the same of the second optical fiber mode fields adapter 32.First light-sensitive optical fibre 41 and the second photosensitive light
Fine 42 structures having the same.First fiber grating, 51 central wavelength is 977nm, and the reflectivity of central wavelength is 98%, secondary lobe
Inhibit than being 25dB；Second fiber grating, 52 central wavelength is 977nm, and the reflectivity of central wavelength is 10%, Sidelobe Suppression ratio
For 25dB.Using the output end of the second light-sensitive optical fibre 42 cutting bevel as output coupling end 60.In embodiment two, if first
Pump module 21 and the second pump module 22 can provide 700W pump light, can reach in the power of 980nm wave band output laser
812W, light light conversion efficiency are 58%, and electro-optical efficiency can reach 25%.
Claims (11)
1. a kind of all optical fibre structure 980nm wave band high-power fiber oscillator, it is characterised in that all optical fibre structure 980nm wave band is high
Power Fiber oscillator is suitable by gain module (10), the first pump module (21), the second pump module (22), the first optical fiber mode fields
Orchestration (31), the second optical fiber mode fields adapter (32), the first light-sensitive optical fibre (41), the first fiber grating (51), the second photosensitive light
Fine (42), the second fiber grating (52) and output coupling end (60) composition；First pump module (21) and the second pump module
(22) it is connected respectively with the pumping light input end of gain module (10), the first optical fiber mode fields adapter (31) and the second optical fiber mode fields
The input terminal of adapter (32) is connected with the signal light output end of gain module (10) respectively, the first optical fiber mode fields adapter (31)
Output end be connected with the input terminal of the first light-sensitive optical fibre (41), the output end and the second light of the second optical fiber mode fields adapter (32)
The input terminal of quick optical fiber (42) is connected；The first fiber grating (51) are inscribed in the fibre core of first light-sensitive optical fibre (41), second is photosensitive
The second fiber grating (52) are inscribed in the fibre core of optical fiber (42)；The input terminal and the second light-sensitive optical fibre (42) at output coupling end (60)
Output end be connected；Connection between different components is realized by fused fiber splice；
Gain module (10) is made of pump coupling module (11) and Double Cladding Ytterbium Doped Fiber (12), and pump light is through pump coupling mould
Block (11), from the side surface coupling of Double Cladding Ytterbium Doped Fiber (12) inner cladding in Double Cladding Ytterbium Doped Fiber (12), and to double clad
Ytterbium ion in Yb dosed optical fiber (12) fibre core is pumped, to generate the light field of 980nm wave band；Gain module (10) has multiple
Light input end is pumped, there are 2 signal light output ends；
First pump module (21) and the second pump module (22) include multiple pumping submodules, the first pump module (21) and
The quantity of the pumping submodule of second pump module (22) and the pumping light input end for being less than or equal to pump coupling module (11)
The output optical fibre of quantity, the first pump module (21) and the second pump module (22) pumps light input end phase with gain module (10)
Even；
The input terminal of first optical fiber mode fields adapter (31) is connected with the signal light output end of gain module (10), the first optical fiber mode
The diameter of field adapter (31) input end fiber fibre core is equal with the diameter of gain module (10) signal light output end fiber core；
The output end of first optical fiber mode fields adapter (31) is connected with the first light-sensitive optical fibre (41) input terminal, the first optical fiber mode fields adapter
(31) diameter of output end fiber core is equal with the diameter of the first light-sensitive optical fibre (41) input terminal fibre core；First optical fiber mode fields are suitable
Orchestration (31) is an optical fiber mode fields adapter or uses sub-optical fibre mould field adapter cascaded structure, the first optical fiber mode fields adapter
(31) concatenated sub-optical fibre mould field adapter number is Q in1, Q1For natural number, the input terminal of the 1st sub- optical fiber mode fields adapter
The as input terminal of the first optical fiber mode fields adapter (31), Q1The output end of a sub- optical fiber mode fields adapter is the first optical fiber
The output end of mould field adapter (31)；
The input terminal of second optical fiber mode fields adapter (32) is connected with the signal light output end of gain module (10), the second optical fiber mode
The diameter of field adapter (32) input end fiber fibre core is equal with the diameter of gain module (10) signal light output end fiber core；
The output end of second optical fiber mode fields adapter (32) is connected with the second light-sensitive optical fibre (42) input terminal, the second optical fiber mode fields adapter
(32) diameter of output end fiber core is equal with the diameter of the second light-sensitive optical fibre (42) input terminal fibre core；Second optical fiber mode fields are suitable
Orchestration (32) is using an optical fiber mode fields adapter or uses sub-optical fibre mould field adapter cascaded structure, the second optical fiber mode fields adaptation
Concatenated sub-optical fibre mould field adapter number is Q in device (32)2,Q2For natural number, the input of the 1st sub- optical fiber mode fields adapter
End is the input terminal of the second optical fiber mode fields adapter (32), Q2The output end of a sub- optical fiber mode fields adapter is the second light
The output end of fine mould field adapter (32)；
The central wavelength for the first fiber grating (51) inscribed in first light-sensitive optical fibre (41) is located at laser wavelength, it may be assumed that and 970nm~
985nm wave band, and it is more than or equal to 90% in the reflectivity of central wavelength, Sidelobe Suppression ratio is more than or equal to 20dB, the first photosensitive light
The output end of fine (41) inhibits reflection of the fiber end face for light field；
In the central wavelength for the second fiber grating (52) inscribed in second light-sensitive optical fibre (42) and the first fiber grating (51)
Heart wavelength offset is less than 1nm, and should be greater than being equal to 10% in the reflectivity of central wavelength, and Sidelobe Suppression ratio should be greater than being equal to
25dB；
The input terminal at output coupling end (60) is connected with the output end of the second light-sensitive optical fibre (42), the input of output coupling end (60)
Hold optical fiber equal with the output end fibre core diameter of the second light-sensitive optical fibre (42).
2. all optical fibre structure 980nm wave band high-power fiber oscillator as described in claim 1, it is characterised in that the pumping
Coupling module (11) is formed from the first side-pumping bundling device (111) and the second side to pump combiner (112), and the first side is to pump
Pu bundling device (111) and the second side to the inner cladding side that pump combiner (112) is by pump light via doubly clad optical fiber,
The optical fibre device being coupled in the inner cladding of doubly clad optical fiber includes no less than 1 pumping light input end, 1 signal light input
End and 1 output end；The signal light input end (11101) of first side-pumping bundling device (111) and the second side-pumping close beam
The signal light input end (11201) of device (112) is 2 signal light input ends of pump coupling module (11)；First side is to pump
The output end (11102) of Pu bundling device (111) and the second side are as pumped to the output end (11202) of pump combiner (112)
2 output ends of coupling module (11)；The pumping light input end (1111-111N) of first side-pumping bundling device (111) and
The pumping light input end (1121-112M) of two side-pumping bundling devices (112) is that the pump light of pump coupling module (11) is defeated
Enter end；The output end of the output end (11102) of first side-pumping bundling device (111) and the second side to pump combiner (112)
(11202) both ends with Double Cladding Ytterbium Doped Fiber (12) are respectively connected with, and the pumping light input end of pump coupling module (11) is
The pumping light input end of gain module (10), 2 signal light input ends of pump coupling module (11) are gain module (10)
2 signal light output ends；N is the pumping light input end number of the first side-pumping bundling device (111), and M is the second side to pump
The pumping light input end number of Pu bundling device (112), M, N are positive integer, pump coupling module (11) pump light fan-in
Amount is N+M.
3. all optical fibre structure 980nm wave band high-power fiber oscillator as described in claim 1, it is characterised in that pump coupling
Module (11) uses K multimode fibre, the fibre core and Double Cladding Ytterbium Doped Fiber (12) inner cladding optical contact of K multimode fibre, K
For less than or equal to [π (1+R1/r1)] natural number, R1For Double Cladding Ytterbium Doped Fiber (12) inner cladding diameter, r1For multimode fibre
Minimum core diameter, the pump light transmitted in K multimode fibre of pump coupling module (11) pass through optical contact mode, coupling
Into Double Cladding Ytterbium Doped Fiber (12) inner cladding, so that the ytterbium ion pumped in Double Cladding Ytterbium Doped Fiber (12) fibre core generates
The light field of 980nm wave band；The both ends of K multimode fibre of pump coupling module (11) are that the pump light of gain module (10) is defeated
Enter end, the both ends of Double Cladding Ytterbium Doped Fiber (12) are the signal light output end of gain module (10), pump coupling module (11)
Pump light input terminal quantity is 2K.
4. all optical fibre structure 980nm wave band high-power fiber oscillator as described in claim 1, it is characterised in that described first
Pumping submodule in pump module (21) and the second pump module (22) is partly leading for tail optical fiber output 900nm~960nm wave band
Body laser, the tail optical fiber of semiconductor laser are the output optical fibre for pumping submodule, constitute the institute of the first pump module (21)
The output optical fibre for having pumping submodule is the output optical fibre of the first pump module (21), constitutes the institute of the second pump module (22)
The output optical fibre for having pumping submodule is the output optical fibre of the second pump module (22)；First pump module (21) and the second pump
The diameter of the output optical fibre of Pu module (22) is less than or equal to the diameter of gain module (10) pump light input end fiber；First pumping
The numerical aperture of the output optical fibre of module (21) and the second pump module (22) is inputted less than or equal to gain module (10) pump light
Hold the numerical aperture of optical fiber.
5. all optical fibre structure 980nm wave band high-power fiber oscillator as described in claim 1, it is characterised in that described first
Pumping submodule in pump module (21) and the second pump module (22) is exported multiple tail optical fibers using binding structure is closed
The tail optical fiber output semiconductor laser of 900nm~960nm wave band is defeated to one by least one fiber pump combiner conjunction beam
Out in optical fiber.
6. all optical fibre structure 980nm wave band high-power fiber oscillator as described in claim 1, it is characterised in that the double-contracting
The fibre core cladding diameter ratio of layer Yb dosed optical fiber (12) is more than or equal to 30%.
7. all optical fibre structure 980nm wave band high-power fiber oscillator as described in claim 1, it is characterised in that the sub-light
Fine mould field adapter cascaded structure, which refers to, fits the output end of i-th sub-optical fibre mould field adapter and the sub- optical fiber mode fields of i+1
The input terminal of orchestration is connected, and requires the output end core diameter and the sub- optical fiber mode of i+1 of i-th of sub-optical fibre mould field adapter
The input terminal core diameter of field adapter is equal, i=1,2 ... ..., Q-1, and Q is the number of concatenated sub-optical fibre mould field adapter.
8. all optical fibre structure 980nm wave band high-power fiber oscillator as described in claim 1, it is characterised in that the Q1With
Q2It is the natural number less than or equal to 10.
9. all optical fibre structure 980nm wave band high-power fiber oscillator as claimed in claim 8, feature is in the Q1And Q2
It is the natural number less than or equal to 5.
10. all optical fibre structure 980nm wave band high-power fiber oscillator as described in claim 1, feature is described first
The output end of light-sensitive optical fibre (41) is cut using oblique angle.
11. all optical fibre structure 980nm wave band high-power fiber oscillator as described in claim 1, feature is in the output
Coupled end (60) is using the oblique angle cutting of fiber end face or end cap.
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| CN108963738A (en) * | 2018-10-11 | 2018-12-07 | 中国人民解放军国防科技大学 | Double-end output linear cavity all-fiber laser oscillator |
| CN110247292B (en) * | 2019-07-04 | 2021-04-13 | 华中科技大学鄂州工业技术研究院 | Device and method for inhibiting photodarkening and photodarkening bleaching |
| CN112290364B (en) * | 2020-11-20 | 2024-05-24 | 中国人民解放军国防科技大学 | 980 Nm-band high-power optical fiber oscillator with all-fiber structure |
| CN114122878B (en) * | 2021-11-24 | 2023-09-12 | 国科大杭州高等研究院 | Laser, optical device and production method |
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| CN103682965B (en) * | 2013-12-31 | 2015-12-30 | 中国人民解放军国防科学技术大学 | All optical fibre structure 980nm wave band Compound Cavity single mode fiber laser |
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