CN107623246A - Fibre core is the same as band pumped optical fibre laser - Google Patents
Fibre core is the same as band pumped optical fibre laser Download PDFInfo
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Abstract
A kind of fibre core is the same as band pumped optical fibre laser, it is characterized in that, including pump module (01), resonant tank module (02) amplifying stage module (03), wherein pump module (01) passes through low loss welding by low loss welding, resonant tank module (02) with resonant tank module (02) with amplifying stage module (03)；Described pump module (01 include semiconductor laser (1), semiconductor laser (2) ... semiconductor laser N, wherein N≤20；(30 numbers are N to pump combiner, are the type of (N+1) × 1, wherein N≤20；The pumping arm (20) of pump combiner (30)；The present invention 1. can realize fibre core with band pumping amplification output in large mode field doubly clad optical fiber；2. resulting from same root optical fiber with band pump light and flashlight, imported without coupled apparatus, it is simple in construction；3. the fibre core of the structure is simple with band pumped optical fibre laser scheme, integrated level is high；4. the fibre core of high-capacity optical fiber laser can be realized with band pumping amplification output.
Description
Technical field
The invention belongs to laser field, especially belongs to high power full optical fiber laser technical field.
Technical background
Full-optical-fiber laser has that compact-sized, integrated level is high, beam quality is excellent, high conversion efficiency and perfect heat-dissipating etc.
Advantage.It is widely used demand in industrial market and national defense and military fields.With the increase in demand of application, to optical fiber laser
Power requirement also more and more higher.Limited and the power of semiconductor laser and the limitation of brightness, and optical fiber and optical fibre device
The limitation of itself fuel factor and nonlinear effect, the power output of the optical fiber laser of semiconductor laser pump-coupling also because
This and be restricted.With the effective way for being acknowledged as being lifted single fiber laser output power with pumping.It is by low-light level
The output light of semiconductor laser be converted to the optical fiber laser of high brightness, then using optical-fiber laser as pumping source, identical work(
High 2~3 magnitudes of brightness ratio semiconductor laser of optical-fiber laser under rate.It is secondary pumping with band pumping, therefore is also referred to as it
For cascaded pump.The IPG single fiber lasers of current maximum power output are exactly based in the world realizes with band pump mode.
High-capacity optical fiber laser is typically using Yb dosed optical fiber as gain media, its conventional semiconductor laser device used
Wavelength is 915nm and 975nm.And it is typically chosen in 1018nm with the wavelength with pumping source.Because ytterbium ion is at 1018nm
A low magnitude of the absorption cross-section than 976nm, it is double in large mode field so ytterbium ion is relatively low in the gain of 1018nm wavelength pumpings
Low to the covering absorption coefficient of 1018nm laser in cladded-fiber, which has limited the absorption of 1018nm laser, the gain light of use
Fine length requirement is very long, and in high-capacity optical fiber laser, the fiber lengths of use are longer, corresponding nonlinear effect threshold value
It is lower.Ytterbium grain is improved with band pumping using fibre core for ytterbium-doped double-cladded-layer laser is low to 1018nm laser cladding absorption efficiencies
Son is to 1018nm laser induced plasma flow fields, but current fibre core is small based on single-mode fiber or mould field with most of band pumping configuration
Optical fiber realize that be limited to the limitation for bearing power of fibre core coupled apparatus, its laser power that can be imported is at several watts to several
Ten watts of level, it is unfavorable for realizing high power with band pumping amplification output.
The content of the invention
The present invention discloses a kind of fibre core with band pumped optical fibre laser, it is possible to achieve high-power fibre core amplifies with band pumping
Output.
A kind of fibre core is the same as band pumped optical fibre laser, it is characterised in that including pump module 01, resonant tank module 02 amplifies
Level module 03, wherein pump module 01 pass through low loss welding, resonant tank module 02 and amplifying stage module with resonant tank module 02
03 passes through low loss welding；
Described pump module 01 include semiconductor laser 1, semiconductor laser 2 ... semiconductor laser N, wherein N
≤20；30 numbers of pump combiner are N, are the type of (N+1) × 1, wherein N≤20；The pumping arm 20 of pump combiner 30, its number
Similarly for N (N≤20), low loss welding is connected one by one with each semiconductor laser, and oblique angle end face 61, it is the type of (N+1) × 1
The signal of pump combiner 30 is fine, end plane angle >=5 °；
Described resonant tank module 02 include with the high reflective grid 41 with pump wavelength, double- cladding doped fiber 51, together
The low reflective grid 42 of band pump wavelength, the low reflective grid 43 of signal light wavelength, cladding light stripper 70；
Amplifying stage module 03 includes double- cladding doped fiber 52, output end cap 62；
Described semiconductor laser 1, semiconductor laser 2 ... semiconductor laser N (N≤20) are partly leading for same parameter
Body laser, all semiconductor lasers all band tail optical fibers export, and it exports the pump of the fine footpath parameter of tail optical fiber and pump combiner 30
The fine footpath parameter of Pu arm 20 is identical, and the numerical aperture of all semiconductor laser output tail optical fibers is not higher than the numerical aperture of pumping arm 20
Footpath；All semiconductor lasers are all connected with tail optical fiber with the pumping arm 20 of pump combiner 30 by low loss welding, and half and half leads
Can be single tube coupling or target bar coupling inside body laser.
Described pump combiner 30 (N≤20), it is the type of (N+1) × 1, the single armed of the pumping arm 20 of pump combiner 30
Ability to bear >=100W laser powers, the signal fibre end face of its input are made into oblique angle end face 61, and end face is smooth and end face
Angle >=5 ° prevent that wherein transmission laser has Fresnel reflection to influence with the resonator stability with pump light and enhancing signal
The gain of light and spontaneous emission light.
The described same input with the high reflective grid 41 of pump wavelength and the pump combiner 30 in pump module 01
Output end signal fibre is connected by low loss welding, and its output end and one end of double- cladding doped fiber 51 are melted by low-loss
Connect and be connected.It with the output end of reflectivity >=99% with pump wavelength, its fine footpath parameter and pump combiner 30 to believing
Number fibre is consistent, the pump power >=1000W that can be born with the high reflective grid 41 with pump wavelength, and the laser power that can be born >=
800W。
Described double- cladding doped fiber 51 is Yb dosed optical fiber, its other end with the low reflective grid 42 of pump wavelength
Input is connected by low loss welding, its core diameter with the tail optical fiber core diameter with the high reflective grid 41 of pump wavelength
Unanimously, its inner cladding can be the structures such as polygon, quincunx, D types, and inner cladding diameter is low reflective with band pump wavelength
The diameter of the tail optical fiber of grid 42 is suitable, and its length is determined according to the covering absorption coefficient of doping concentration and noise spectra of semiconductor lasers pump light
Fixed, the total length typically chosen should ensure that the absorption of the pump light that noise spectra of semiconductor lasers imports in more than 20dB, meets same band
The requirement of the resonance gain of pump light and the spontaneous emission light of suppression amplification
The input of the described same output end reflective grid 43 low with signal light wavelength with the low reflective grid 42 of pump wavelength
It is connected by low loss welding, with being used in pairs with the high reflective grid 41 of band pump wavelength, with double- cladding doped fiber 51 1
Composition is played with the resonator with pump light.It is to being 5%~50% with the reflectivity section with pump wavelength, the pump that can be born
Pu power >=1000W, the laser power >=800W that can be born；
The output end of the low reflective grid 43 of described signal light wavelength passes through low-loss with the input of cladding light stripper 70
Welding is connected, and its fine footpath and numerical aperture are consistent with the tail optical fiber with the low reflective grid 42 of pump wavelength, and it is to signal light-wave
Long reflectivity section is 2%~10%, and reflectivity is too high to cause the signal gain of light to account for leading role suppression with band pump light
Vibration.Its pump power >=1000W that can be born, the laser power >=800W that can be born；
The output end of described cladding light stripper 70 is led to one end of double- cladding doped fiber 52 in amplifying stage module 03
Cross low loss welding to be connected, it is produced on the output end tail optical fiber of the low reflective grid 43 of signal light wavelength, fine footpath parameter and numerical value
Aperture reflective grid 43 low with signal light wavelength it is consistent, it is to filter out remnant pump light in covering and fibre core is leaked to bag that it, which is acted on,
Laser in layer, filters out ability >=200W；
Double- cladding doped fiber 52 in described amplifying stage module 03 is fibre core Yb dosed optical fiber, and its fine footpath size dimension is not
Less than double- cladding doped fiber 51, fibre core/covering numerical aperture is also not less than fibre core/covering numerical value of double- cladding doped fiber 51
Aperture.Its length adulterates ytterbium ion to band pumping according to the output of resonant tank module 02 with band pumping light power and its fibre core
The absorption coefficient of light determines, fiber lengths selected by general warranty meet fibre core to total absorption >=20dB with pump light, with full
Foot is fully absorbed with band pump light and zooms into signal light output；
Output end cap 62 in described amplifying stage module 03 is a quartzy end cap, is the laser output of amplifying stage, can
With the laser power >=3000W born.
The present invention using a gain fibre realizes flashlight and with the light with two kinds of wavelength of pump light while produces, and all
Constrain in same fibre core, then the light of two kinds of wavelength is imported into the fibre core of amplifying stage, realize that high-power same band pumping is put
Big output.The program ensure that on the whole flashlight and with band pump light in same fibre core, increase amplifying stage in adulterate from
To with the absorption efficiency with pump light, impracticable coupled apparatus imports with band pump light in structure of the present invention, simple in construction, carries
The high stability of high-capacity optical fiber laser.
The beneficial effects of the invention are as follows：
1. fibre core can be realized with band pumping amplification output in large mode field doubly clad optical fiber；
2. resulting from same root optical fiber with band pump light and flashlight, imported without coupled apparatus, it is simple in construction；
3. the fibre core of the structure is simple with band pumped optical fibre laser scheme, integrated level is high；
4. the fibre core of high-capacity optical fiber laser can be realized with band pumping amplification output.
Brief description of the drawings
Fig. 1, schematic structural view of the invention.
Specific implementation method
A kind of fibre core is the same as band pumped optical fibre laser, it is characterised in that including pump module 01, resonant tank module 02 amplifies
Level module 03, wherein pump module 01 pass through low loss welding, resonant tank module 02 and amplifying stage module with resonant tank module 02
03 passes through low loss welding；
Described pump module 01 include semiconductor laser 1, semiconductor laser 2 ... semiconductor laser N, wherein N
≤20；30 numbers of pump combiner are N, are the type of (N+1) × 1, wherein N≤20；The pumping arm 20 of pump combiner 30, its number
Similarly for N (N≤20), low loss welding is connected one by one with each semiconductor laser, and oblique angle end face 61, it is the type of (N+1) × 1
The signal of pump combiner 30 is fine, end plane angle >=5 °；
Described resonant tank module 02 include with the high reflective grid 41 with pump wavelength, double- cladding doped fiber 51, together
The low reflective grid 42 of band pump wavelength, the low reflective grid 43 of signal light wavelength, cladding light stripper 70；
Amplifying stage module 03 includes double- cladding doped fiber 52, output end cap 62；
Described semiconductor laser 1, semiconductor laser 2 ... semiconductor laser N (N≤20) are partly leading for same parameter
Body laser, all semiconductor lasers all band tail optical fibers export, and it exports the pump of the fine footpath parameter of tail optical fiber and pump combiner 30
The fine footpath parameter of Pu arm 20 is identical, and the numerical aperture of all semiconductor laser output tail optical fibers is not higher than the numerical aperture of pumping arm 20
Footpath；All semiconductor lasers are all connected with tail optical fiber with the pumping arm 20 of pump combiner 30 by low loss welding, and half and half leads
Can be single tube coupling or target bar coupling inside body laser.
Described pump combiner 30 (N≤20), it is the type of (N+1) × 1, the single armed of the pumping arm 20 of pump combiner 30
Ability to bear >=100W laser powers, the signal fibre end face of its input are made into oblique angle end face 61, and end face is smooth and end face
Angle >=5 ° prevent that wherein transmission laser has Fresnel reflection to influence with the resonator stability with pump light and enhancing signal
The gain of light and spontaneous emission light.
The described same input with the high reflective grid 41 of pump wavelength and the pump combiner 30 in pump module 01
Output end signal fibre is connected by low loss welding, and its output end and one end of double- cladding doped fiber 51 are melted by low-loss
Connect and be connected.It with the output end of reflectivity >=99% with pump wavelength, its fine footpath parameter and pump combiner 30 to believing
Number fibre is consistent, the pump power >=1000W that can be born with the high reflective grid 41 with pump wavelength, and the laser power that can be born >=
800W。
Described double- cladding doped fiber 51 is Yb dosed optical fiber, its other end with the low reflective grid 42 of pump wavelength
Input is connected by low loss welding, its core diameter with the tail optical fiber core diameter with the high reflective grid 41 of pump wavelength
Unanimously, its inner cladding can be the structure such as polygon, quincunx, D types, inner cladding diameter with the low reflective grid of pump wavelength
The diameter of 42 tail optical fibers is suitable, and its length determines according to the covering absorption coefficient of doping concentration and noise spectra of semiconductor lasers pump light,
The total length typically chosen should ensure that the absorption for the pump light that noise spectra of semiconductor lasers imports in more than 20dB, the same band pumping of satisfaction
The requirement of the resonance gain of light and the spontaneous emission light of suppression amplification
The input of the described same output end reflective grid 43 low with signal light wavelength with the low reflective grid 42 of pump wavelength
It is connected by low loss welding, with being used in pairs with the high reflective grid 41 of band pump wavelength, with double- cladding doped fiber 51 1
Composition is played with the resonator with pump light.It is to being 5%~50% with the reflectivity section with pump wavelength, the pump that can be born
Pu power >=1000W, the laser power >=800W that can be born；
The output end of the low reflective grid 43 of described signal light wavelength passes through low-loss with the input of cladding light stripper 70
Welding is connected, and its fine footpath and numerical aperture are consistent with the tail optical fiber with the low reflective grid 42 of pump wavelength, and it is to signal light-wave
Long reflectivity section is 2%~10%, and reflectivity is too high to cause the signal gain of light to account for leading role suppression with band pump light
Vibration.Its pump power >=1000W that can be born, the laser power >=800W that can be born；
The output end of described cladding light stripper 70 is led to one end of double- cladding doped fiber 52 in amplifying stage module 03
Cross low loss welding to be connected, it is produced on the output end tail optical fiber of the low reflective grid 43 of signal light wavelength, fine footpath parameter and numerical value
Aperture reflective grid 43 low with signal light wavelength it is consistent, it is to filter out remnant pump light in covering and fibre core is leaked to bag that it, which is acted on,
Laser in layer, filters out ability >=200W；
Double- cladding doped fiber 52 in described amplifying stage module 03 is fibre core Yb dosed optical fiber, and its fine footpath size dimension is not
Less than double- cladding doped fiber 51, fibre core/covering numerical aperture is also not less than fibre core/covering numerical value of double- cladding doped fiber 51
Aperture.Its length adulterates ytterbium ion to band pumping according to the output of resonant tank module 02 with band pumping light power and its fibre core
The absorption coefficient of light determines, fiber lengths selected by general warranty meet fibre core to total absorption >=20dB with pump light, with full
Foot is fully absorbed with band pump light and zooms into signal light output；
Output end cap 62 in described amplifying stage module 03 is a quartzy end cap, is the laser output of amplifying stage, can
With the laser power >=3000W born.
The present invention is done as described in detail below with reference to accompanying drawing：
The fibre core of the present invention is with band pumped optical fibre laser, and structural representation is as shown in figure 1, its structure includes pump module
01, resonant tank module 02, amplifying stage module 03, the definite functions of each module, the function of pump module 01 is that semiconductor laser carries
For the energy of a pumping；The function of resonant tank module 02 be using pump module 01 provide pump energy be converted into it is most
With with pump light and a small amount of flashlight；The function of amplifying stage module 03 is that resonant tank module 02 is exported into most same band pump
Pu light and a small amount of flashlight are realized with band pumping laser amplification output by fibre core pump mode.The connected mode of each module is such as
Under：Pump module 01 passes through low damage by low loss welding, resonant tank module 02 with resonant tank module 02 with amplifying stage module 03
Welding is consumed, forms the fibre core of an all optical fibre structure with band pumped optical fibre laser.
Pump module 01 include semiconductor laser 1, semiconductor laser 2 ... semiconductor laser N (N≤20), pumping
Bundling device 30, it is the type of (N+1) × 1 (N≤20).Semiconductor laser 1, semiconductor laser 2 ... semiconductor laser N (N≤
20) be same parameter semiconductor laser, all semiconductor lasers all band tail optical fiber export, its export tail optical fiber fine footpath parameter with
The fine footpath parameter of the pumping arm 20 of pump combiner 30 is identical, and tail optical fiber cladding diameter is common 105 μm, 200 μm etc. for general output
Specification, numerical aperture is common 0.15,0.2,0.22 equal-specification, and the numerical aperture of all semiconductor lasers output tail optical fibers is not high
In the numerical aperture of pumping arm 20, power output >=50W of each semiconductor laser, the output wavelength selection of semiconductor laser
Near 975nm, be advantageous to the absorption of Yb dosed optical fiber, semiconductor laser can lock output wavelength with body grating.All half
Conductor laser is all connected with tail optical fiber with the pumping arm 20 of pump combiner 30 by low loss welding, in each semiconductor laser
Portion can be single tube or target bar as luminescence unit, and by being coupled into optical fiber output, each semiconductor laser operationally will
Logical cooling water heat radiation protection.Pump combiner 30 is that the pump light of each semiconductor laser imports the core device of doubly clad optical fiber
Part, its structure are the type of (N+1) × 1 (N≤20), the pump light importing for the low-light level that can export N number of semiconductor laser
Into doubly clad optical fiber.The pumping arm 20 of pump combiner 30, its number are similarly N (N≤20) and each semiconductor laser
Low loss welding is connected one by one, pump light ability to bear >=100W of single armed, to guarantee to import enough pump lights.Each pump
The pumping light transmission rate of Pu arm is more than 98.5%, ensures the high efficiency coupling of pump light, and realizes high power fibre core with band pump
The primary power at Pu ensures that device outer wall when being connected with high power pump light of pump combiner 30 needs plus heat radiation protection device.
The signal fibre end face of the input of pump combiner 30 is made into oblique angle end face 61, and end face is smooth and end plane angle >=5 ° prevent it
Middle transmission laser has Fresnel reflection to influence with the resonator stability with pump light and enhancing flashlight and spontaneous emission light
Gain, general angle Selection when making can effectively prevent the feedback of flashlight and suppress spontaneous emission light at 8 °.
Resonant tank module 02 is included with the high reflective grid 41 with pump wavelength, double- cladding doped fiber 51, with band pumping
The low reflective grid 42 of optical wavelength, the low reflective grid 43 of signal light wavelength, cladding light stripper 70, the module are to realize that whole high power is fine
Core with the core with pumped optical fibre laser, be realize with pump light and flashlight in the pass of same fibre core synchronism output
Key unit.The order of connection of each several part is in the module：With input and pump module with the high reflective grid 41 of pump wavelength
The output end signal fibre of pump combiner 30 in 01 is connected by low loss welding, with the high reflective grid 41 of band pump wavelength
Output end be connected with one end of double- cladding doped fiber 51 by low loss welding, the other end of double- cladding doped fiber 51
It is connected with the input with the low reflective grid 42 of pump wavelength by low loss welding, the low reflective grid with band pump wavelength
The input of 42 output end reflective grid 43 low with signal light wavelength is connected by low loss welding, and signal light wavelength is low reflective
The output end of grid 43 is connected with the input of cladding light stripper 70 by low loss welding.Wherein cladding light stripper 70
Output is connected with the double- cladding doped fiber 52 in amplifying stage module 03 by low loss welding.
In resonant tank module 02 it is same with the high reflective grid 41 of pump wavelength to the reflectivity with the wavelength with pump light >=
99%, its fine footpath parameter and numerical aperture are fine consistent with the output end signal of pump combiner 30, and it is to non-with band pumping light wave
For the sideband reflectivity of long laser 0.1%~0.5%, the very low reflectivity in the part is used as one of flashlight feedback
Point.The same band pump wavelength of general Yb dosed optical fiber is selected near 1018nm, and signal light wavelength is selected near 1080nm, together
Pump power >=1000W, the laser power >=800W that can be born that high reflective grid 41 with pump wavelength can be born, ensure real
Existing high power is the same as band pumping light generation output.Double- cladding doped fiber 51 in resonant tank module 02 is Yb dosed optical fiber, is to realize
With the gain media with pump light and signal light output, its core diameter with it is fine with the tail optical fiber with the high reflective grid 41 of pump wavelength
Core diameter is consistent, and its inner cladding can be the structures such as polygon, quincunx, D types, and inner cladding diameter is low with band pump wavelength
The diameter of the reflective tail optical fiber of grid 42 is suitable, and its length is according to doping concentration and the covering absorption coefficient of noise spectra of semiconductor lasers pump light
Determine, the total length typically chosen should ensure that the absorption for the pump light that covering noise spectra of semiconductor lasers imports in more than 20dB, full
Foot is with the requirement of the resonance gain with pump light and the spontaneous emission light for suppressing amplification, and double- cladding doped fiber 51 is in importing height
Need outer heating/cooling device to radiate it during power pump light, prevent optical fiber uneven heating from fire damage occur.Resonant tank module 02
In it is same with the low reflective grid 42 of pump wavelength be with the output end with pump light, itself and with the high reflective grid of band pump wavelength
41 use in pairs, are formed together with double- cladding doped fiber 51 with the resonator with pump light.It is low reflective with band pump wavelength
Grid 42 are to being 5%~50% with the reflectivity section with pump wavelength, and the selection of specific reflectivity is according to the total pump of importing
Luminous power, length and the parameter selection of gain fibre, optimize with the resonator stability with pump light and increase with band pump light
Gain, suppress amplification spontaneous radiation, it is ensured that occupied an leading position in resonant tank module 02 with the gain with pump light.It can
Pump power >=the 1000W born, the laser power >=800W that can be born.Signal light wavelength in resonant tank module 02 is low reflective
The output end of grid 43, it is placed on is followed by ensure with preferentially real with pump light with the low reflective grid 42 of pump wavelength
Now vibration output because in the miscellaneous double clad 51 of ytterbium is mixed the gain of flashlight be eager to excel with the gain with pump light, once signal
Light preferentially obtains gain amplification, then will be suppressed with band pump light.Its fine footpath and numerical aperture and same band pump wavelength
The tail optical fiber of low reflective grid 42 is consistent, and its reflection bandwidth≤0.5nm to flashlight, the reflectivity section to signal light wavelength is
2%~10%, it is too tolerant easily to cause vibration.Reflectivity is too high to cause the signal gain of light to account for leading role suppression with band pump light
Vibration, because required signal light power need not be too high, in a watt level, so the gain for flashlight need to do it is above-mentioned
Suppression means.The flashlight feedback end of low-power come from with the very low sideband reflectivity of the high reflective grid 41 of pump wavelength with
And the antiradar reflectivity of pump combiner 30.With the pump power >=1000W that can be born with the low reflective grid 42 of pump wavelength, can hold
Laser power >=the 800W received.
Cladding light stripper 70 in resonant tank module 02 is produced on the output end tail optical fiber of the low reflective grid 43 of signal light wavelength
On, fine footpath parameter reflective grid 43 low with signal light wavelength with numerical aperture it is consistent, its effect is to filter out the remaining pump in covering
Pu light and fibre core are leaked to the laser in covering, glue are filtered out as carrier is filtered out using high performance refractive index, by covering
Light-output, it filters out ability >=200W.Needed when it filters out operation plus water cooling ensures, in case refractive index filters out glue because of high temperature
Denaturation influences filtration result.
Amplifying stage module 03 includes double- cladding doped fiber 52 and output end cap 62, the one end of double- cladding doped fiber 52 with it is humorous
The output end of cladding light stripper 70 in chamber module 02 of shaking is connected by low loss welding, and double- cladding doped fiber 52 is another
End is connected with the output end of output end cap 62 by low loss welding, and the output end of output end cap 62 is the defeated of whole laser
Go out end.
Double- cladding doped fiber 52 in amplifying stage module 03 is fibre core Yb dosed optical fiber, and its fine footpath size dimension is not less than double
Clad doped optical fiber 51, fibre core/covering numerical aperture are also not less than fibre core/covering numerical aperture of double- cladding doped fiber 51.
Its length adulterates ytterbium ion to with pump light according to the output of resonant tank module 02 with pumping light power and its fibre core
Absorption coefficient determines, fiber lengths selected by general warranty meet fibre core to total absorption >=20dB with pump light, same to meet
Band pump light, which is fully absorbed, zooms into signal light output.Output end cap 62 in amplifying stage module 03 is a quartzy end cap, its
End face is coated with the anti-reflection film of flashlight, and signal light transmission rate >=98.5% is the laser output of amplifying stage, and what can be born swashs
Luminous power >=3000W, to guarantee to transmit high-power flashlight.
Fibre core of the present invention amplifies output with the same band pumping that can be realized with pumped optical fibre laser more than hectowatt magnitude, and
Only need once to import the i.e. achievable operation of pumping twice of pump light, be that the pumping of semiconductor laser immediate wrapper realizes same for the first time
Band pump light and the same fibre core synchronism output of flashlight, are to realize to put flashlight with pump light in fibre core for the second time
Greatly, designed can be voluntarily to operate for resonant tank module 02 and amplifying stage module 03.Whole optical fiber laser structure is simple, behaviour
It is convenient to make, and is a kind of effective way for realizing the output of high power high luminance laser.
Above-described specific implementation method, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the specific embodiment that the foregoing is only the present invention, be not intended to limit the invention,
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., it should be included in the present invention's
Within protection domain.In addition, the above-mentioned definition to each element and method is not limited in the various specific knots mentioned in embodiment
Structure, shape or mode, those of ordinary skill in the art simply can be changed or replaced to it, such as：By fibre core of the present invention
Provided for simple replacement of with the type of pump combiner 30 with pump module in pumped optical fibre laser 01 and position, by the present invention with band pump
Pu light and signal light wavelength are provided for simple replacement of all within protection scope of the present invention.
For the fibre core of the present invention with band pumped optical fibre laser, its structure includes pump module 01, resonant tank module 02, amplification
Level module 03, pump module 01 are logical with amplifying stage module 03 by low loss welding, resonant tank module 02 with resonant tank module 02
Cross low loss welding；
Described pump module 01 include semiconductor laser 1, semiconductor laser 2 ... semiconductor laser N (N≤
20), pump combiner 30 (N≤20), it is the type of (N+1) × 1, and the pumping arm 20 of pump combiner 30, its number is similarly N
(N≤20) low loss welding is connected one by one with each semiconductor laser, oblique angle end face 61, and it is the type pump combiner of (N+1) × 1
30 signal is fine, end plane angle >=5 °；
Described resonant tank module 02 include with the high reflective grid 41 with pump wavelength, double- cladding doped fiber 51, together
The low reflective grid 42 of band pump wavelength, the low reflective grid 43 of signal light wavelength, cladding light stripper 70；
Described amplifying stage module 03 includes double- cladding doped fiber 52, output end cap 62；
Described semiconductor laser 1, semiconductor laser 2 ... semiconductor laser N (N≤20) are partly leading for same parameter
Body laser, all semiconductor lasers all band tail optical fibers export, and it exports the pump of the fine footpath parameter of tail optical fiber and pump combiner 30
The fine footpath parameter of Pu arm 20 is identical, and the numerical aperture of all semiconductor laser output tail optical fibers is not higher than the numerical aperture of pumping arm 20
Footpath.All semiconductor lasers are all connected with tail optical fiber with the pumping arm 20 of pump combiner 30 by low loss welding, and half and half leads
Can be single tube coupling or target bar coupling inside body laser；
Described pump combiner 30 (N≤20), it is the type of (N+1) × 1, the single armed of the pumping arm 20 of pump combiner 30
Ability to bear >=100W laser powers, the signal fibre end face of its input are made into oblique angle end face 61, and end face is smooth and end face
Angle >=5 ° prevent that wherein transmission laser has Fresnel reflection to influence with the resonator stability with pump light and enhancing signal
The gain of light and spontaneous emission light；
The described same input with the high reflective grid 41 of pump wavelength and the pump combiner 30 in pump module 01
Output end signal fibre is connected by low loss welding, and its output end and one end of double- cladding doped fiber 51 are melted by low-loss
Connect and be connected.It with the output end of reflectivity >=99% with pump wavelength, its fine footpath parameter and pump combiner 30 to believing
Number fibre is consistent, the pump power >=1000W that can be born with the high reflective grid 41 with pump wavelength, and the laser power that can be born >=
800W；
Described double- cladding doped fiber 51 is Yb dosed optical fiber, its other end with the low reflective grid 42 of pump wavelength
Input is connected by low loss welding, its core diameter with the tail optical fiber core diameter with the high reflective grid 41 of pump wavelength
Unanimously, its inner cladding can be the structure such as polygon, quincunx, D types, inner cladding diameter with the low reflective grid of pump wavelength
The diameter of 42 tail optical fibers is suitable, and its length determines according to the covering absorption coefficient of doping concentration and noise spectra of semiconductor lasers pump light,
The total length typically chosen should ensure that the absorption for the pump light that noise spectra of semiconductor lasers imports in more than 20dB, the same band pumping of satisfaction
The requirement of the resonance gain of light and the spontaneous emission light of suppression amplification；
The input of the described same output end reflective grid 43 low with signal light wavelength with the low reflective grid 42 of pump wavelength
It is connected by low loss welding, with being used in pairs with the high reflective grid 41 of band pump wavelength, with double- cladding doped fiber 51 1
Composition is played with the resonator with pump light.It is to being 5%~50% with the reflectivity section with pump wavelength, the pump that can be born
Pu power >=1000W, the laser power >=800W that can be born；
The output end of the low reflective grid 43 of described signal light wavelength passes through low-loss with the input of cladding light stripper 70
Welding is connected, and its fine footpath and numerical aperture are consistent with the tail optical fiber with the low reflective grid 42 of pump wavelength, and it is to signal light-wave
Long reflectivity section is 2%~10%, and reflectivity is too high to cause the signal gain of light to account for leading role suppression with band pump light
Vibration.Its pump power >=1000W that can be born, the laser power >=800W that can be born；
The output end of described cladding light stripper 70 is led to one end of double- cladding doped fiber 52 in amplifying stage module 03
Cross low loss welding to be connected, it is produced on the output end tail optical fiber of the low reflective grid 43 of signal light wavelength, fine footpath parameter and numerical value
Aperture reflective grid 43 low with signal light wavelength it is consistent, it is to filter out remnant pump light in covering and fibre core is leaked to bag that it, which is acted on,
Laser in layer, filters out ability >=200W；
Double- cladding doped fiber 52 in described amplifying stage module 03 is fibre core Yb dosed optical fiber, and its fine footpath size dimension is not
Less than double- cladding doped fiber 51, fibre core/covering numerical aperture is also not less than fibre core/covering numerical value of double- cladding doped fiber 51
Aperture.Its length adulterates ytterbium ion to band pumping according to the output of resonant tank module 02 with band pumping light power and its fibre core
The absorption coefficient of light determines, fiber lengths selected by general warranty meet fibre core to total absorption >=20dB with pump light, with full
Foot is fully absorbed with band pump light and zooms into signal light output；
Output end cap 62 in described amplifying stage module 03 is a quartzy end cap, is the laser output of amplifying stage, can
With the laser power >=3000W born.
The invention aims to solve problem present in technical background, and fibre core pumped optical fibre laser at present
In with band pump light need to imported into gain fibre by fibre core coupled apparatus.A kind of fibre core is provided with band pumped fiber laser
Device, it utilizes the pump combiner of the type of (N+1) × 1 by the pump light of semiconductor laser using positive end pumping structure
It is coupled in large mode field doubly clad optical fiber, to realizing synchronous pump with the resonator of the resonator with pump light and flashlight,
It can not only have been obtained on a piece gain fibre with band pump light but also flashlight can be obtained.Using with pump light for wavelength
High is anti-main resonator to forming with the resonator with pump light, the part with low reflective grid, consumes semiconductor laser
Pump light；And the resonator of flashlight is then low with the sideband of the high reflective grid with pump light using the low reflective grid of flashlight
The unwanted oscillation of reflectivity composition obtains the flashlight of low-power.Again by powerful with the flashlight with pump light and low-power
It is synchronous to be transferred to from fibre core in amplifying stage, realize fibre core with band pumping amplification output in stage gain optical fiber.
Accompanying drawing：
Fig. 1 fibre cores are the same as band pumped optical fibre laser schematic diagram.
Claims (10)
1. a kind of fibre core is the same as band pumped optical fibre laser, it is characterised in that including pump module (01), resonant tank module (02) is put
Big level module (03), wherein pump module (01) and resonant tank module (02) by low loss welding, resonant tank module (02) with
Amplifying stage module (03) passes through low loss welding；
Described pump module (01 include semiconductor laser (1), semiconductor laser (2) ... semiconductor laser N, wherein
N≤20；(30 numbers are N to pump combiner, are the type of (N+1) × 1, wherein N≤20；Pump combiner (30 pumping arm (20, its
Similarly for N (N≤20), low loss welding is connected number one by one with each semiconductor laser, and oblique angle end face (61), it is (N+1)
The signal of × 1 type pump combiner (30) is fine, end plane angle >=5 °；
Described resonant tank module (02) include with the high reflective grid (41) with pump wavelength, double- cladding doped fiber (51),
Low reflective grid (42), the low reflective grid (43) of signal light wavelength, cladding light stripper (70) with band pump wavelength；
Amplifying stage module (03) includes double- cladding doped fiber (52), output end cap (62).
2. a kind of fibre core according to claim 1 is the same as band pumped optical fibre laser, it is characterised in that described semiconductor swashs
Light device (1), the semiconductor laser that semiconductor laser (2) ... semiconductor laser N (N≤20) is same parameter, it is all partly to lead
Body laser all band tail optical fibers export, and it exports the fine footpath of the fine footpath parameter of tail optical fiber and the pumping arm (20) of pump combiner (30) and joined
Number is identical, and the numerical aperture of all semiconductor laser output tail optical fibers is not higher than the numerical aperture of pumping arm (20)；It is all partly to lead
Body laser is all connected with tail optical fiber with the pumping arm (20) of pump combiner (30) by low loss welding, each semiconductor laser
Inside can be single tube coupling or target bar coupling.
3. a kind of fibre core according to claim 1 or 2 is the same as band pumped optical fibre laser, it is characterised in that described pumping
Bundling device (30) (N≤20), it is the type of (N+1) × 1, the single armed ability to bear of the pumping arm (20) of pump combiner (30) >=
100W laser powers, the signal fibre end face of its input are made into oblique angle end face (61), and end face is smooth and end plane angle >=5 °
Prevent that wherein transmission laser has Fresnel reflection to influence with the resonator stability with pump light and enhancing flashlight and spontaneous
The gain of radiant light.
4. a kind of fibre core according to claim 1 or 2 or 3 is the same as band pumped optical fibre laser, it is characterised in that described is same
Input and the output end signal of the pump combiner (30) in pump module (01) with the high reflective grid (41) of pump wavelength
Fibre is connected by low loss welding, and (51 one end is connected its output end by low loss welding with double- cladding doped fiber.
It is to the same as reflectivity >=99% with pump wavelength, the output end signal fibre one of its fine footpath parameter and pump combiner (30)
Cause, the pump power >=1000W that can be born with the high reflective grid (41) with pump wavelength, the laser power that can be born >=
800W。
5. a kind of fibre core according to claim 1 or 4 is the same as band pumped optical fibre laser, it is characterised in that described double-contracting
Layer doped fiber (51) be Yb dosed optical fiber, and its other end passes through low damage with the input together with the low reflective grid (42) of pump wavelength
Consumption welding is connected, and its core diameter is consistent with the tail optical fiber core diameter with the high reflective grid (41) of pump wavelength, bag in it
Layer can be the structure such as polygon, quincunx, D types, inner cladding diameter with together with low reflective grid (42) tail optical fiber of pump wavelength
Diameter is suitable, and its length determines according to the covering absorption coefficient of doping concentration and noise spectra of semiconductor lasers pump light, general to choose
Total length should ensure that the pump light that noise spectra of semiconductor lasers imports absorption in more than 20dB, meet with the resonance with pump light
The requirement of the spontaneous emission light of gain and suppression amplification.
6. a kind of fibre core according to claim 1 or 4 or 5 is the same as band pumped optical fibre laser, it is characterised in that described is same
The input of output end reflective grid (43) low with signal light wavelength with the low reflective grid (42) of pump wavelength is melted by low-loss
Connect and be connected, with being used in pairs with the high reflective grid (41) of band pump wavelength, formed together with double- cladding doped fiber (51) same
Resonator with pump light.Its to the reflectivity section with pump wavelength be 5%~50%, the pump power that can be born >=
1000W, the laser power >=800W that can be born.
7. a kind of fibre core according to claim 1 or 4 or 5 is the same as band pumped optical fibre laser, it is characterised in that described letter
The output end of number low reflective grid (43) of optical wavelength is connected with the input of cladding light stripper (70) by low loss welding, its
Fine footpath and numerical aperture are consistent with the tail optical fiber with the low reflective grid (42) of pump wavelength, its reflectivity area to signal light wavelength
Between be 2%~10%, reflectivity too it is high can cause the signal gain of light account for leading role suppress with the vibration with pump light.It can hold
Pump power >=the 1000W received, the laser power >=800W that can be born.
8. a kind of fibre core according to claim 1 or 4 or 5 is the same as band pumped optical fibre laser, it is characterised in that described bag
The output end of layer light stripper (70) is melted with double- cladding doped fiber (52) one end in amplifying stage module (03) by low-loss
Connect and be connected, it is produced on the output end tail optical fiber of the low reflective grid (43) of signal light wavelength, fine footpath parameter and numerical aperture and letter
Number low reflective grid (43) of optical wavelength it is consistent, it is to filter out remnant pump light in covering and fibre core is leaked in covering that it, which is acted on,
Laser, filter out ability >=200W.
9. a kind of fibre core according to claim 1 or 4 or 5 is the same as band pumped optical fibre laser, described amplifying stage module
(03) double- cladding doped fiber (52) in is fibre core Yb dosed optical fiber, and its fine footpath size dimension is not less than double- cladding doped fiber
(51), fibre core/covering numerical aperture is also not less than fibre core/covering numerical aperture of double- cladding doped fiber (51).Its length root
Ytterbium ion is adulterated to the absorption system with pump light with pumping light power and its fibre core according to the output of resonant tank module (02)
Number determines, fiber lengths selected by general warranty meet fibre core to total absorption >=20dB with pump light, to meet with band pumping
Light, which is fully absorbed, zooms into signal light output.
10. a kind of fibre core according to claim 1 or 4 or 5 is the same as band pumped optical fibre laser, described amplifying stage module
(03) the output end cap (62) in is a quartzy end cap, is the laser output of amplifying stage, the laser power that can be born >=
3000W。
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| CN108832470A (en) * | 2018-06-05 | 2018-11-16 | 天津凯普林光电科技有限公司 | A kind of optical fiber laser |
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| CN111934179A (en) * | 2020-09-03 | 2020-11-13 | 中国人民解放军国防科技大学 | Ytterbium-doped fiber laser using specific wavelength band pump |
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