CN107370011A - Large-power optical fiber amplifier - Google Patents
Large-power optical fiber amplifier Download PDFInfo
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- CN107370011A CN107370011A CN201710556146.8A CN201710556146A CN107370011A CN 107370011 A CN107370011 A CN 107370011A CN 201710556146 A CN201710556146 A CN 201710556146A CN 107370011 A CN107370011 A CN 107370011A
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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
- H01S3/06754—Fibre amplifiers
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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
- H01S3/06745—Tapering of the fibre, core or active region
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- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
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Abstract
A kind of large-power optical fiber amplifier, multiple step gains optical fiber is used in amplifying stage, including seed source, amplifying stage and output end device, wherein amplifying stage, input the seed optical-fiber laser, with the seed optical-fiber laser of amplifying stage pump laser amplification low-power, form large-power optical fiber laser, amplifying stage includes the N section stage gain optical fiber set along the defeated direction of seed optical fiber laser, compared with leading portion stage gain optical fiber, the core diameter increase of back segment stage gain optical fiber, and fibre core gain media doping concentration is not less than leading portion stage gain optical fiber, N is the integer more than or equal to 2.Laser power profile lifting in amplifying stage of the present invention, by the laser of the high light beam quality of seed source part first in the gain fibre of thin fibre core amplifying power, then continue hoisting power in very thin thicker gain fibre again, the high light beam quality of large-power optical fiber amplifier is ensured with this.
Description
Technical field
The present invention relates to laser technology field, more particularly to a kind of large-power optical fiber amplifier.
Background technology
High-power full-optical-fiber laser is because using all -fiber closing waveguiding structure, thin fibre core transmission, it consolidates with traditional
Body laser compared to possessing many excellent specific properties such as good beam quality, integrated level height, small in volume, conversion efficiency height and
Laser researcher and users are enjoyed to pay close attention to.In recent years, high-capacity optical fiber laser is widely used in industrial processes, national defence troops
Fields such as thing, increasing material manufacturing, and with the increase of application demand, the world market share of high-capacity optical fiber laser also by
Year is incremented by.
One of scheme that the high power fiber laser of continuous wave mode of operation generally uses is fiber amplifier, namely is adopted
With master oscillator power amplifier (MOPA：Master oscillator power amplifier) structure.It is by power
Seed light is coupled into the fibre of the double- cladding doped fiber of amplifying stage by low, good beam quality optical-fiber laser as seed source
In core, powerful pump light is injected in the double- cladding doped fiber inner cladding of amplifying stage, is realized to low-power seed light
Power significantly amplifies lifting.Thousands of watts of amounts can be achieved in semiconductor laser pump-coupling single-stage fiber amplifier traditional at present
The laser output of level, single-stage fiber amplifier can even realize the laser output of myriawatt magnitude by the way of cascaded pump.
Large-power optical fiber laser is needed to keep preferable far-field energy concentration degree in some Military Applications, that just needs separate unit optical fiber to swash
The laser of light device output keeps preferable beam quality, preferably single mode or the operating of quasi- single mode.The light of high-power and high-lighting beam quality
Fine laser is also the target of the unremitting pursuit of area research persons.
But the influence of nonlinear effect (such as stimulated Raman scattering), fuel factor, pattern unstability factor is constrained to,
Large-power optical fiber amplifier output thousands of watts so that myriawatt magnitude laser when, its beam quality has corruptions generation.And
These thousands of watts or even the optical-fiber laser output of myriawatt magnitude, generally use large mode field Double Cladding Ytterbium Doped Fiber, using big fibre core
It is most directly negative although doped fiber alleviates damage and the nonlinear problem that high power laser is brought to a certain extent
Influence is exactly that beam quality declines.The optical fiber of big mode field area increases transferable laser transverse mode in fiber core in itself
Quantity, its can only slight relief fibre laser power and beam quality contradiction, can not effectively keep high light beam quality.Will
Obtain the large-power optical fiber laser of high-power high light beam quality, it is necessary to take other technologies approach.
In large-power optical fiber amplifier, semiconductor pumped light or the same band of thousands of watts or even myriawatt magnitude can be typically injected
Pump light, using one section of optical fiber that fibre core is consistent in amplifying stage, the initiating terminal caloric value of gain fibre is very big in amplifying stage, holds
Easily cause the fuel factor in gain fibre, such as thermic pattern wild effect.
The content of the invention
(1) technical problems to be solved
In order to solve the problems, such as that prior art is present, the invention provides a kind of large-power optical fiber amplifier.
(2) technical scheme
The present invention provides a kind of large-power optical fiber amplifier, uses multiple step gains optical fiber in amplifying stage, its structure includes kind
Component, amplifying stage and output device, wherein：
Seed source, for producing and exporting seed optical-fiber laser；
Amplifying stage, the seed optical-fiber laser is inputted, the seed optical fiber for amplifying low-power with amplifying stage pump laser swashs
Light, forms large-power optical fiber laser, and amplifying stage includes the N section stage gain light set along the defeated direction of seed optical fiber laser
Fibre, compared with leading portion stage gain optical fiber, the core diameter increase of back segment stage gain optical fiber, and fibre core gain media is mixed
Miscellaneous concentration is not less than leading portion stage gain optical fiber, and N is the integer more than or equal to 2；
Output device, filter out cladding light and export the powerful optical-fiber laser.
Further, the inner cladding diameter of each section of stage gain optical fiber is identical with numerical aperture.
Further, the core diameter of the front end stage gain optical fiber set along the defeated direction of seed optical fiber laser is big
In or equal to seed source gain fibre core diameter.
Further, the seed source also includes multiple seed source pump lasers, seed source pump combiner, the first light
Fine grating, the second fiber grating and cladding light stripper, wherein：The pumping arm of seed source pump combiner respectively with multiple seeds
The output end connection of source pump laser；The non-high opposite ends of first fiber grating is connected with the output end of seed source pump combiner
Connect, the high opposite ends of the first fiber grating is connected with one end of seed source gain fibre, the other end of seed source gain fibre with
The low opposite ends of second fiber grating is connected；The non-low opposite ends of second fiber grating is connected with the input of cladding light stripper
Connect；The output end of cladding light stripper is the laser output par, c of seed source, for exporting seed optical-fiber laser.
Further, the amplifying stage also includes multiple amplifying stage pump lasers, an amplifying stage pump combiner, and
Multistage stage gain optical fiber, wherein：The pumping arm of amplifying stage pump combiner respectively with the multiple amplifying stage pumping laser
The output end connection of device；N section stage gains optical fiber connects the output end of the amplifying stage pump combiner.
Further, it is connected between the N sections stage gain optical fiber by welding.
Further, seed source and stage gain optical fiber are yb-doped double-clad fiber.
Further, the output device includes cladding light stripper, energy-transmission optic fibre and cap end, wherein：Cladding light filters out
The input of device is connected with the laser output par, c of end stage gain optical fiber；Cladding light stripper is prepared in energy-transmission optic fibre
On；The end of energy-transmission optic fibre is connected with end cap, device of the end cap as fiber amplifier output laser.
Further, the multiple seed source pump laser is semiconductor laser, is exported by pigtail coupling, tail optical fiber
Numerical aperture is not higher than 0.22.
Further, the pump light of the multiple seed source pump laser output can be applied to positive, reverse or two-way
Pumping configuration.
Further, the multiple amplifying stage pump laser can be semiconductor laser or optical fiber laser, or
The combining form of semiconductor laser and optical fiber laser.
(3) beneficial effect
It can be seen from the above technical proposal that the large-power optical fiber amplifier of the present invention has the advantages that：
(1) amplifying stage of large-power optical fiber amplifier is made using the thinner stage gain optical fiber of fibre core first in the present invention
For gain media, be advantageous to keep the high light beam quality consistent with seed source part in amplifying stage；
(2) amplifying stage of large-power optical fiber amplifier of the present invention uses multistage stage gain optical fiber, fibre core from fine to coarse,
Covering is relatively low to Pumping light absorption coefficient in the optical fiber of thin fibre core, and the caloric value of optical fiber is smaller, is advantageous to gain fibre distribution
Formula radiates, and improves the unstable threshold value of thermic pattern；
(3) the multiple step gains optical fiber of the amplifying stage of large-power optical fiber amplifier of the present invention and prior art are only with one
Segment length identical gain fibre compares, and because amplifying stage back segment is thicker using the fibre core of gain fibre, can improve non-linear
The threshold value of effect such as stimulated Raman scattering.
(4) fiber amplifier of the present invention makes simple, is easily realized in commercially producing, and maintenance cost is low.
Brief description of the drawings
Fig. 1 is the structural representation of the large-power optical fiber amplifier of the embodiment of the present invention.
Fig. 2 is the stage gain optical fiber detailed schematic of the embodiment of the present invention.
Embodiment
In the present invention, " high-power " refers to " more than 1kW laser power "." low-power " refers to the power less than 1kW.
For the object, technical solutions and advantages of the present invention are more clearly understood, referring to the drawings 1 and accompanying drawing 2, to this
Invention is further described.
According to the basic conception of the present invention, there is provided a kind of large-power optical fiber amplifier, seed source part use thinner fibre core
Gain fibre and energy-transmission optic fibre, amplifying stage input part using thinner fibre core gain fibre, in amplifier out
Using the gain fibre of thicker fibre core, the thin gain fibre of fibre core first lifts a part of amplifying power in amplifying stage, protects for part
The high light beam quality of seed source is held, it is in the thick gain fibre of fibre core that the larger high light beam quality laser power of power is further
Lifting, the high light beam quality of large-power optical fiber amplifier is ensured with this.Two sections in same amplifier or multiple step gains optical fiber
Cladding diameter it is identical with numerical aperture, ensure covering in large power pumping optical can be with matching transmission.In the initial end of amplifying stage
Using the thin gain fibre of fibre core, its covering absorption coefficient is relatively low, and gain fibre can be reduced when large power pumping optical injects
Fuel factor.
Large-power optical fiber amplifier architecture of the present invention shown in Fig. 1 includes seed source 1, amplifying stage 2, output device 3.Seed source
1 is used to produce and export seed optical-fiber laser；Amplifying stage 2 inputs the seed optical-fiber laser, with amplifying stage pump laser
Pumping light amplification seed light fibre laser, forms large-power optical fiber laser, and amplifying stage 2 includes setting along seed light line laser transmission direction
The N section stage gain optical fiber put, compared with leading portion stage gain optical fiber, the core diameter of back segment stage gain optical fiber increases
Greatly, N is the integer more than or equal to 2；Output device 3 is used to filter out cladding light and exports the powerful optical-fiber laser.
Structural representation is as shown in figure 1, each structure division on-link mode (OLM) can be：Seed source 1 is exported on energy-transmission optic fibre
Making has cladding light stripper 15, and the output optical fibre of cladding light stripper 15 links amplifying stage pump combiner 23 in amplifying stage 2
Signal input part, the output end connection output end 3 of amplifying stage 2, the large-power optical fiber laser of final amplification are defeated by output device 3
Go out.
In certain embodiments, seed source 1 can be line chamber type full-optical-fiber laser, by the first fiber grating 13 and
Two fiber gratings 14 use in pairs is used as Laser feedback and output end, and forms resonator, using the kind of ytterbium-doped double-cladded-layer structure
Component gain fibre 11 is used as gain medium, and pump light is imported into seed source 1 using seed source pump combiner 12
In resonator, pump light vibrates back and forth in resonator through fiber grating pair to be formed laser and is exported by the second fiber grating 14.Allusion quotation
The each several part of the seed source 1 of type forms order：Semiconductor laser 01, semiconductor laser 02, semiconductor laser 03 ...
Semiconductor laser 0N (N >=4) output end is connected with each pumping arm of seed source pump combiner 12, seed source pumping
The output end of bundling device 12 is connected with the non-high opposite ends of the first fiber grating 13, the high opposite ends and seed of the first fiber grating 13
One end of source gain optical fiber 11 is connected, and the other end of seed source gain fibre 11 is connected with the low opposite ends of the second fiber grating 14
Connect, the non-low opposite ends of fiber grating 14 is connected with the input of cladding light stripper 15, the output end of cladding light stripper 15
Namely the laser output par, c of seed source 1.
In certain embodiments, semiconductor laser 01, semiconductor laser 02, semiconductor laser 03 ... semiconductor
The more semiconductor laser output laser such as laser 0N (N >=4) can be 976nm wavelength nearby, and output laser power is not low
In 50W, all exported by pigtail coupling, the numerical aperture of tail optical fiber is not higher than 0.22；Seed source pump combiner 12 can be N × 1
Or the type of (N+1) × 1, wherein N >=4, single arm tolerance power are not less than 100W, overall power transmitance is not less than 92%, seed
The long and slender footpath of output light of source pump combiner 12 and numerical-aperture parameters and seed source gain fibre 11, the first fiber grating 13
It is all identical；Seed source gain fibre 11 is yb-doped double-clad fiber, and core diameter is not higher than 20 μm, such as more common gain fibre
Model：LMA-YDF-10/130, LMA-YDF-15/130, LMA-YDF-20/400 of Nufern companies, Coractive company
DCF-YB-8/128, DCF-YB-20/128, Yb DCOF-15/125, Yb 1200-10/125, the Yb 1200- of LEIKKI companies
12/125th, Yb 1200-20/400 etc.；First fiber grating 13 and the second fiber grating 14 use in pairs, can all be for 1 μm
High/low anti-bragg grating near wavelength, the optical fiber fibre footpath to fiber grating is identical with numerical-aperture parameters, and first
Fiber grating 13 is high anti-fiber grating, and its reflectivity is not less than 95%, and the second fiber grating 14 is low anti-fiber grating, and its is anti-
Rate is penetrated not higher than 30%；Cladding light stripper 15 is the device of the covering photospallation prepared on energy-transmission optic fibre, and inside is by reflecting
Rate matching fluid or energy-transmitting optical fibers at cladding corrosion are made, and cladding light stripping ability is not less than 100W.
The output laser power of seed source 1 can be 20~1000W, Output of laser wavelength near 1 μm, be commonly used for 1070~
1085nm wavelength.
Amplifying stage 2 is the core that laser power is significantly lifted.Its gain media is straight by two sections or multistage inner cladding
Footpath and numerical aperture identical yb-doped double-clad fiber composition, and the inner cladding fibre footpath of each section of gain fibre and numerical aperture ginseng
Number is consistent, and the large power pumping optical of multiple amplifying stage pump lasers is imported into amplifying stage using amplifying stage pump combiner increases
In the inner cladding of beneficial optical fiber, large power pumping optical is absorbed by fibre core during covering transmits and carries out laser amplifier.Amplification
Two sections or multiple step gains optical fiber of level, arrange from fine to coarse along the fibre core of the gain fibre used in laser transmission direction, first paragraph
The core diameter of gain fibre is not less than the core diameter of the gain fibre of seed source, and the core diameter of second segment gain fibre is big
In the core diameter of first paragraph gain fibre, the fibre core ytterbium ion doping concentration of second segment gain fibre is not less than first paragraph gain
Optical fiber.If any the 3rd section of gain fibre, its core diameter is more than the core diameter of second segment gain fibre.Amplifying stage includes multistage
Gain fibre, from fine to coarse, covering is relatively low to Pumping light absorption coefficient in the optical fiber of thin fibre core for fibre core, the caloric value of optical fiber compared with
It is small, be advantageous to gain fibre distributed heat removal, improve the unstable threshold value of thermic pattern.
In certain embodiments, each several part composition order of amplifying stage 2 can be：Amplifying stage pump laser 41, amplification
Level pump laser 42, amplifying stage pump laser 43 ... amplifying stage pump laser 4N (N >=6) output end and amplifying stage
Each pumping arm of pump combiner 23 is connected, output end and the first paragraph stage gain light of amplifying stage pump combiner 23
One end of fibre 21 is connected, and the other end of stage gain optical fiber 21 is connected with one end of stage gain optical fiber 22, amplification
The other end of stage gain optical fiber 22 is the laser output par, c of amplifying stage, be connected with output device 3, wherein gain fibre
Hop count is not less than 2.
In certain embodiments, amplifying stage pump laser 41, amplifying stage pump laser 42, amplifying stage pump laser
43rd ... amplifying stage pump laser 4N (N >=6) can be semiconductor laser, can also all be optical fiber laser, can also
For the combining form of semiconductor laser and optical fiber laser.The wavelength of semiconductor laser can be near 915nm, 975nm etc.
Wavelength, the wavelength of optical fiber laser can be the wavelength nearby such as 980nm, 1018nm, 1030nm.Wherein amplifying stage pump laser 41
~amplifying stage pump laser 4N can be single semiconductor laser or optical fiber laser, or multiple semiconductor lasers or
Multi-channel optical fibre laser closes Shu Ercheng laser.The pump light of injection amplification level 2 can be the pump light of single wavelength, or
The pump light of multi-wavelength, as 915nm, 975nm dual wavelength pumping, 915nm, 980nm, 1018nm multi wavelength pumping etc. mix pumping
Form, the power proportions of each wavelength can adjust according to the model of gain fibre and the design requirement of amplifier.Using 975nm,
The semiconductor laser of 915nm wavelength, its individual module power output, which in hectowatt magnitude, by multichannel closes Shu Houke and obtains hectowatt, is
To the pump light of kilowatt magnitude；Using 1018nm optical fiber laser, its single laser power output also in hectowatt magnitude, is passed through
Multichannel can reach thousands of watts of magnitudes after closing beam, benefit from the brightness height of optical fiber laser, the fibre core of output optical fibre is thin, and multichannel closes beam
High brightness can be still kept afterwards.
In certain embodiments, amplifying stage pump combiner 23 can be the type of (N+1) × 1, and wherein N >=6, single pumping arm is resistance to
It is not less than 2000W by power capability, pumping transmitance is not less than 95%, when such as making pumping for the optical fiber laser of high brightness, its
Tolerance power ability is multiplicable, and transmitance can also increase, the tail optical fiber of each pumping arm and 41~laser of laser 4N output light
It is fine consistent.The output end energy-transmission optic fibre core parameters and numerical aperture of amplifying stage pump combiner 23 and stage gain optical fiber 21
It is consistent.Stage gain optical fiber 21 is consistent with the inner cladding parameter of gain fibre, as stage gain optical fiber 21 uses YDF-
15/250 fine footpath, stage gain optical fiber 22 is using the matching of YDF-25/250 fibres footpath；Stage gain optical fiber 21 uses YDF-20/
400 fine footpaths, stage gain optical fiber 22 is using the matching of YDF-30/400 fibres footpath.
In certain embodiments, stage gain optical fiber 21 equally can be yb-doped double-clad fiber, its core diameter
Not less than the core diameter of seed source gain fibre 11；The cladding diameter of stage gain optical fiber 21, numerical-aperture parameters are with putting
Stage gain optical fiber 22 is consistent greatly, and stage gain optical fiber 21 is connected with stage gain optical fiber 22 by low loss welding,
Wherein stage gain optical fiber 21 and the schematic diagram that is connected of stage gain optical fiber 22 is as shown in Figure 2.Stage gain optical fiber
22 core diameter is more than the core diameter of stage gain optical fiber 21.The high-power pump imported by amplifying stage pump combiner 23
The covering that Pu light is exaggerated stage gain optical fiber 21 first absorbs and is coupled in fibre core, due to the fibre of stage gain optical fiber 21
Core/covering ratio value is smaller, and its absorption coefficient to cladding light is also relative can be relatively low, therefore will not produce larger heat, but
Also can by the power amplification of seed light, because the core diameter of stage gain optical fiber 21 and seed source gain fibre 11 approaches,
The hoisting power of high light beam quality can be kept during seed light amplification.By seed light power ascension to sufficiently large power
When, then be amplified by stage gain optical fiber 22, due to being absorbed by the covering of stage gain optical fiber 21, and amplifying stage
The covering of gain fibre 22 is absorbed, and the pump light in the fibre core of stage gain optical fiber 22 can be fully absorbed.Powerful bloom
The laser of beam quality is exaggerated in stage gain optical fiber 22, and its beam quality will not be by significant degradation, such as 3kW high beam matter
The laser of amount is amplified to 4kW in stage gain optical fiber 22, and its beam quality will not be by significant degradation.Stage gain light
The doping concentration of fibre 21 and stage gain optical fiber 22, fine footpath parameter, length ratio and total length are by injection pumping wavelength, pump
The design objective of Pu general power and amplifier determines.
Output device 3 is the output device of whole high power fiber laser.The each several part composition order of output device 3
It is：The input of cladding light stripper 32 is connected with the laser output par, c of the stage gain optical fiber 22 of amplifying stage 2, covering
Light stripper 32 namely preparation are on energy-transmission optic fibre 31, and the end of energy-transmission optic fibre 31 is connected with end cap 33, and end cap 33 is output
The device of laser.
In certain embodiments, output device 3 cladding light stripper 32 effect be divest it is unabsorbed in covering
Pump light and fibre core are leaked to the laser of covering, and it is peeled off covering light ability and is not less than 200W.It is to expand fibre core light beam to hold cap 33
A kind of device of beam, reduce the power density of fibre core output laser beam or a kind of QBH export heads, its tolerance power
Not less than 5000W.
The large-power optical fiber amplifier of the embodiment of the present invention, it is also applied for the large-power optical fiber amplification of multistage MOPA forms
Device, wherein pumping form can also use counter-pumping configuration or bidirectional pumping structure.
So far, the present embodiment is described in detail combined accompanying drawing.According to above description, those skilled in the art
There should be clear understanding to large-power optical fiber amplifier of the present invention.
It should be noted that in accompanying drawing or specification text, the implementation that does not illustrate or describe is affiliated technology
Form known to a person of ordinary skill in the art, is not described in detail in field.In addition, above-mentioned definition to each element and not only limiting
Various concrete structures, shape or the mode mentioned in embodiment, those of ordinary skill in the art can be carried out simply more to it
Change or replace, such as：
(1) gain fibre in embodiment in amplifying stage is illustrated exemplified by two sections, is not used for limiting the present invention
Protection domain, can actually use multiple step gains optical fiber；
(2) consideration that above-described embodiment can be based on design and reliability, the collocation that is mixed with each other uses or and other embodiment
Mix and match uses, i.e., the technical characteristic in different embodiments can freely form more embodiments.
By a kind of large-power optical fiber amplifier described in above-described embodiment, two sections or multistage are used in fiber amplifier level
Gain fibre as gain media, in amplifying stage the fibre core of each section of gain fibre from fine to coarse, cladding diameter and numerical aperture phase
Together.Laser power in amplifying stage is lifted stage by stage, can by the beam quality in amplifying stage without significant degradation and effectively
Improving laser power, large-power optical fiber amplifier high light beam quality is ensured with this.It can amplify to obtain high-power high light beam quality
Optical-fiber laser output, while initial thin fibre core low gain amplification can improve the unstable generation threshold value of pattern.
Particular embodiments described above, the purpose of the present invention, technical scheme and beneficial effect are carried out further in detail
Describe in detail it is bright, should be understood that the foregoing is only the present invention specific embodiment, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., it should be included in the guarantor of the present invention
Within the scope of shield.
Claims (10)
1. a kind of large-power optical fiber amplifier, it is characterised in that use multiple step gains optical fiber in amplifying stage, its structure includes seed
Source, amplifying stage and output device, wherein：
Seed source, for producing and exporting seed optical-fiber laser；
Amplifying stage, the seed optical-fiber laser is inputted, amplify the seed optical-fiber laser of low-power, shape with amplifying stage pump laser
Into large-power optical fiber laser, amplifying stage includes the N section stage gain optical fiber set along the defeated direction of seed optical fiber laser, and preceding
Section stage gain optical fiber is compared, the core diameter increase of back segment stage gain optical fiber, and fibre core gain media doping concentration
Not less than leading portion stage gain optical fiber, N is the integer more than or equal to 2；
Output device, filter out cladding light and export the powerful optical-fiber laser.
2. large-power optical fiber amplifier according to claim 1, it is characterised in that each section of stage gain optical fiber
Inner cladding diameter is identical with numerical aperture.
3. large-power optical fiber amplifier according to claim 1, it is characterised in that set along the defeated direction of seed optical fiber laser
The core diameter for the front end stage gain optical fiber put is more than or equal to seed source gain fibre core diameter.
4. large-power optical fiber amplifier according to claim 1, it is characterised in that the seed source also includes multiple seeds
Source pump laser, seed source pump combiner, the first fiber grating, the second fiber grating and cladding light stripper, wherein：
Output end of the pumping arm of seed source pump combiner respectively with multiple seed source pump lasers is connected；
The non-high opposite ends of first fiber grating is connected with the output end of seed source pump combiner, and the height of the first fiber grating is anti-
End is connected with one end of seed source gain fibre, the other end of seed source gain fibre low opposite ends phase with the second fiber grating
Connection；
The non-low opposite ends of second fiber grating is connected with the input of cladding light stripper；
The output end of cladding light stripper is the laser output par, c of seed source, for exporting seed optical-fiber laser.
5. large-power optical fiber amplifier according to claim 1, it is characterised in that the amplifying stage also includes multiple amplifications
Level pump laser, an amplifying stage pump combiner, and multistage stage gain optical fiber, wherein：
Output end of the pumping arm of amplifying stage pump combiner respectively with the multiple amplifying stage pump laser is connected；
N section stage gains optical fiber connects the output end of the amplifying stage pump combiner.
6. large-power optical fiber amplifier according to claim 1, it is characterised in that the N sections stage gain optical fiber it
Between be connected by welding.
7. large-power optical fiber amplifier according to claim 1, it is characterised in that seed source and stage gain optical fiber are equal
For yb-doped double-clad fiber.
8. large-power optical fiber amplifier according to claim 1, it is characterised in that the output device is filtered including cladding light
Except device, energy-transmission optic fibre and cap end, wherein：
The input of cladding light stripper is connected with the laser output par, c of end stage gain optical fiber；
Cladding light stripper is prepared on energy-transmission optic fibre；
The end of energy-transmission optic fibre is connected with end cap, element of the end cap as fiber amplifier output laser.
9. large-power optical fiber amplifier according to claim 4, it is characterised in that the multiple seed source pump laser
For semiconductor laser, exported by pigtail coupling, the numerical aperture of tail optical fiber is not higher than 0.22, and it exports pump light and is applied to just
To, reversely or bidirectional pumping structure.
10. large-power optical fiber amplifier according to claim 5, it is characterised in that the multiple amplifying stage pumping laser
Device is semiconductor laser or optical fiber laser, or is the combining form of semiconductor laser and optical fiber laser.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109807420A (en) * | 2019-03-26 | 2019-05-28 | 中南大学 | Aluminum/steel dissimilar metal low power laser couples DP-MIG melt-brazing method |
| CN110707518A (en) * | 2019-11-05 | 2020-01-17 | 佛山市宝光新宇实业有限公司 | Return-removing fiber laser and return-removing fiber |
| CN112117631A (en) * | 2020-11-23 | 2020-12-22 | 深圳市海创光学有限公司 | Optical fiber laser |
| CN115377784A (en) * | 2022-10-24 | 2022-11-22 | 中国航天三江集团有限公司 | Same-band pump optical fiber amplifier and method |
| CN115693362A (en) * | 2023-01-04 | 2023-02-03 | 武汉锐科光纤激光技术股份有限公司 | Seed source of pulse laser and laser |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109807420A (en) * | 2019-03-26 | 2019-05-28 | 中南大学 | Aluminum/steel dissimilar metal low power laser couples DP-MIG melt-brazing method |
| CN109807420B (en) * | 2019-03-26 | 2020-08-11 | 中南大学 | Aluminum/steel dissimilar metal low-power laser coupling DP-MIG fusion brazing method |
| CN110707518A (en) * | 2019-11-05 | 2020-01-17 | 佛山市宝光新宇实业有限公司 | Return-removing fiber laser and return-removing fiber |
| CN112117631A (en) * | 2020-11-23 | 2020-12-22 | 深圳市海创光学有限公司 | Optical fiber laser |
| CN115377784A (en) * | 2022-10-24 | 2022-11-22 | 中国航天三江集团有限公司 | Same-band pump optical fiber amplifier and method |
| CN115693362A (en) * | 2023-01-04 | 2023-02-03 | 武汉锐科光纤激光技术股份有限公司 | Seed source of pulse laser and laser |
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