CN108879314A - High-power narrow linewidth long-wave optical fiber laser generating system - Google Patents
High-power narrow linewidth long-wave optical fiber laser generating system Download PDFInfo
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- CN108879314A CN108879314A CN201811034544.4A CN201811034544A CN108879314A CN 108879314 A CN108879314 A CN 108879314A CN 201811034544 A CN201811034544 A CN 201811034544A CN 108879314 A CN108879314 A CN 108879314A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 206
- 239000000835 fiber Substances 0.000 claims abstract description 155
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- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 70
- 230000003321 amplification Effects 0.000 claims abstract description 54
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 54
- 230000003287 optical effect Effects 0.000 claims abstract description 49
- 230000003595 spectral effect Effects 0.000 claims abstract description 29
- 238000001228 spectrum Methods 0.000 claims abstract description 27
- 229910052769 Ytterbium Inorganic materials 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000005253 cladding Methods 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 18
- -1 ytterbium ion Chemical class 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
-
- 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
- H01S3/0014—Monitoring arrangements not otherwise provided for
-
- 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
- H01S3/06716—Fibre compositions or doping with active elements
-
- 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
-
- 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
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
-
- 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
- H01S3/094049—Guiding of the pump light
- H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
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- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Lasers (AREA)
Abstract
A high-power narrow linewidth long-wave optical fiber laser generating system comprises an optical fiber laser system array, a wavelength division multiplexing system and a mixed gain optical fiber amplifier; the mixed gain optical fiber amplifier comprises a fundamental frequency optical pumping source, an all-fiber signal-pumping beam combiner and a large-mode field ytterbium-doped optical fiber. By utilizing the influence of Raman pumping light time-frequency characteristics on Raman amplification laser spectrum broadening characteristics and the influence of incidence laser time-frequency characteristics on amplification laser spectrum broadening characteristics under direct amplification of ytterbium ion gain, spectrum broadening in mixed gain long-wave optical fiber amplification is effectively inhibited from the aspects of an incident laser implementation mode, a Raman pumping light generation form and the like, a high-performance optical fiber light source design scheme with reliable performance and compact structure is provided for the fields of nonlinear frequency conversion, biomedicine, remote sensing detection, high-resolution spectral imaging, spectral synthesis and the like, and the further development of the field of narrow-linewidth long-wave optical fiber laser radiation is promoted.
Description
Technical field
The invention belongs to light lasers and nonlinear fiber optics technical field, and in particular to a kind of high-power narrow line width long wave
Optical-fiber laser generation system.
Background technique
Wavelength cover is located at the high-power narrow line width long wave optical-fiber laser in 1000-1300nm wave band in non-linear frequency
The fields such as rate transformation, biomedicine, remote sensing, high-resolution spectroscopy imaging, Spectral beam combining have strong application demand and
Development potentiality.
Currently, the major way for generating the output of high-power narrow line width long wave optical-fiber laser includes following 3 kinds：
(1) it directlys adopt narrow-linewidth laser injection in the emission characteristics of long wave band based on ytterbium ion plus Yb dosed optical fiber swashs
Image intensifer realizes the amplification output of narrow linewidth long wave optical-fiber laser.In this scenario, since ytterbium ion is in the transmitting of long wave band
Section is small, and output power can be severely limited by amplified spontaneous emission, is unfavorable for high power development.
(2) it is adulterated using special ion, gain ion is made to have stronger transmitting special in 1000-1300nm wavelength band
Property, special ion optical fiber laser amplifier is injected plus mixed using narrow-linewidth laser realizes that the amplification of narrow linewidth long wave optical-fiber laser is defeated
Out.The program is primarily limited to the technologies such as the preparation of special fiber, welding, and power ascension potentiality are limited.
(3) it is based on Raman gain, realizes narrow linewidth long wave using narrow-linewidth laser injection plus Raman fiber laser amplifier
Optical-fiber laser amplification output.In the program, in order to provide enough gain amplifiers, hundreds of meters of optical fiber need to be generally used, high-order is drawn
The graceful system that can seriously affect is to high power development.
To sum up, although the production method and power of above-mentioned a variety of narrow linewidth long wave optical-fiber lasers has been proposed in researchers
Lifting means realize that the technical solution of high-power narrow line width long wave optical-fiber laser is still very deficient.Therefore, comprehensively consider high-order
Raman inhibits, effective skill of high-power narrow line width long wave optical-fiber laser is realized in amplified spontaneous emission inhibition and spectrum widening, proposition
There is art means important scientific meaning and reality to need.
Summary of the invention
For defect present in existing light laser and nonlinear fiber optics technical field, the present invention provides a kind of big function
Rate narrow linewidth long wave optical-fiber laser generation system.
The present invention utilizes influence and ytterbium ion of the raman pump light time-frequency characteristic to Raman amplifiction laser spectrum spreading characteristic
Gain directly amplifies influence of the lower incident laser time-frequency characteristic to amplification laser spectrum spreading characteristic, from incident laser realization side
Formula, raman pump light generation form etc. effectively inhibit the spectrum widening in hybrid gain long wave fiber amplifier, are non-linear
It is tight that the fields such as frequency transformation, biomedicine, remote sensing, high-resolution spectroscopy imaging, Spectral beam combining provide reliable performance, structure
The high-performance optical fiber light source design scheme gathered pushes the further development in narrow linewidth long wave optical-fiber laser radiation field.
To realize the above-mentioned technical purpose, the technical scheme is that：
A kind of high-power narrow line width long wave optical-fiber laser generation system, including fiber laser system array, wavelength-division multiplex system
System and hybrid gain fiber amplifier；Wherein hybrid gain fiber amplifier includes fundamental frequency optical pumping source, all -fiber signal-pumping
Bundling device and large mode field Yb dosed optical fiber.
Fiber laser system array is respectively λ by n central wavelength1、λ2….λnSingle-frequency or more single frequency fiber laser put
Big device or n central wavelength are respectively λ1、λ2….λnSingle-frequency or more single frequency optical fiber lasers constitute；
Fiber laser system array exports n beam single-frequency or more single-frequency lasers, the central wavelength of n beam single-frequency or more single-frequency lasers
Respectively λ1、λ2….λn, wherein λ1>1000nm, λn<1300nm, λiMeet relational expression λi=λi-1+ Δ λ, 2≤i≤n, Δ λ are
The corresponding Raman stokes light of host material used by large mode field Yb dosed optical fiber is in wavelength in hybrid gain fiber amplifier
The frequency shift amount in domain.
The n beam single-frequency of fiber laser system array output or more single-frequency lasers are injected into wavelength-division multiplex system, through wavelength-division
The laser that multiplex system closes beam output passes through all -fiber signal-pump combiner signal arm in hybrid gain fiber amplifier
It is injected into large mode field Yb dosed optical fiber；The fundamental frequency pump light of fundamental frequency optical pumping source output in hybrid gain fiber amplifier passes through
All -fiber signal-pump combiner pumping arm is coupled in large mode field Yb dosed optical fiber, and hybrid gain fiber amplifier is by drawing
Graceful gain and ytterbium ion gain realize wavelength from λ1To λnConvert and amplification after output center wavelength into λnHigh-power narrow line width
Long wave optical-fiber laser.
In the present invention：The central wavelength for defining the output of fiber laser system array is λ1Laser be fundamental frequency light, optical fiber
The central wavelength of laser system array output is λ2Laser be 1 rank excited Raman stokes light, and so on, optical-fiber laser
The central wavelength of systems array output is λnLaser be n-1 rank excited Raman stokes light.
Large mode field Yb dosed optical fiber in hybrid gain fiber amplifier utilizes the fundamental frequency pump light of fundamental frequency optical pumping source output
Carry out pumping.In hybrid gain fiber amplifier, central wavelength λ1Fundamental frequency light carried out under the pumping of fundamental frequency pump light
Amplification；Amplified central wavelength is λ1Fundamental frequency light serve as the pump light of 1 rank excited Raman stokes light, it is amplified in
The a length of λ of cardiac wave1Fundamental frequency optical pumping large mode field Yb dosed optical fiber amplification central wavelength be λ21 rank excited Raman stokes light；It puts
1 rank excited Raman stokes light after big serves as the pump light of 2 rank excited Raman stokes lights, and amplified 1 rank is excited
It is λ that Raman Stokes optical pumping large mode field Yb dosed optical fiber, which amplifies central wavelength,32 rank excited Raman stokes lights；Successively
Analogize, amplified n-2 rank excited Raman stokes light serves as the pump light of n-1 rank excited Raman stokes light, amplification
N-2 rank excited Raman Stokes optical pumping large mode field Yb dosed optical fiber amplification central wavelength afterwards is λnN-1 rank excited Raman
Stokes light；
In this way, hybrid gain fiber amplifier realizes wavelength from λ by Raman gain and ytterbium ion gain1To λnConversion
And amplification, mainly central wavelength is λ in the optical-fiber laser finally exported through hybrid gain fiber amplifiernHigh-power narrow line
Wide long wave optical-fiber laser.
Further, in order to guarantee final output central wavelength be λnHigh-power narrow line width long wave optical-fiber laser have
High light beam quality, bloom spectral purity.The invention also includes cladding light stripper, end caps, collimator, dichroic mirror, useless light to receive
Storage, the optical-fiber laser exported through hybrid gain fiber amplifier are injected into cladding light stripper, cladding light stripper will be residual
The cladding light that remaining fundamental frequency pump light and amplification generates filters out；Optical-fiber laser after cladding light stripper by end caps and
Beam-expanding collimation exports after collimator, and the optical-fiber laser for collimating output is incident on dichroic mirror, the amplification wherein contained in optical-fiber laser
Afterwards but the central wavelength of incomplete wavelength convert is λ1、λ2….λn-1Laser useless light collector is injected into after dichroic mirror transmits,
It is λ that it is through dichroic mirror reflection output, which is the central wavelength with high light beam quality, bloom spectral purity,nHigh-power narrow line width it is long
Wave optical-fiber laser.
It is realized in the present invention and inhibits spectrum widening, while realizing that the key of narrow linewidth output is：Fiber laser system battle array
Column output center wavelength is λ1、λ2….λn-1Laser need to be single-frequency laser or more single-frequency lasers.
Central wavelength for the output of fiber laser system array is λ1、λ2….λn-1Laser be single-frequency laser or
For more single-frequency lasers.If being more single-frequency lasers, more single-frequency lasers can be modulated through external phase by single-frequency laser and be generated,
Beam can also be closed by multiple discrete single frequency optical fiber lasers to generate.
The central wavelength of fiber laser system array output is λnLaser be single-frequency laser or fiber laser system battle array
The central wavelength of column output is λnLaser be more single-frequency, narrow-linewidth laser, wherein more single-frequency, narrow-linewidth laser are by single-frequency laser
It modulates and generates through external phase.In order to inhibit a length of λ of four-wave mixing centering cardiac wavenAmplify laser linewidth and Spectral Purity
It influences, central wavelength λnNarrow linewidth injection laser generally modulated and generate through external phase by single-frequency laser, without using more
A discrete single frequency optical fiber laser closes beam and generates.
For λ1、λ2….λnEach wavelength, external phase modulated signal can be sine, white noise, pseudo-random phase
Coding etc., is also possible to any combination of above-mentioned different modulated signals.Large mode field in hybrid gain fiber amplifier mixes ytterbium light
After fine host material determines, the corresponding Raman stokes light of host material can be determined in the frequency shift amount Δ λ of wavelength domain.According to
User demand determines the central wavelength lambda for the high-power narrow line width long wave optical-fiber laser for finally needing to generaten, then pass through relational expression λi
=λi-1+ Δ λ, 2≤i≤n, that is, can determine λ1、λ2….λn-1。
In the present invention, the wavelength-division multiplex system implementation is unlimited, can be the injection of more tail optical fibers, single tail optical fiber output,
(m × 1, m are to inject fine number, and 1 is to export fine number) integrated wavelength division multiplexer that multiple micro-optics membrane combinations are realized,
It can be multiple cascade wavelength-division multiplex systems of 2 × 1 wavelength division multiplexer.The effect of wavelength-division multiplex system is by n beam center wavelength
Respectively λ1、λ2….λnSingle-frequency or more single frequency fiber Laser synthesizings be beam of laser output.
In the present invention, the hybrid gain fiber amplifier includes that all -fiber signal-pump combiner, large mode field mix ytterbium
Optical fiber, fundamental frequency optical pumping source.Wherein：All -fiber signal-pump combiner is made of signal arm, fundamental frequency light pumping arm, output arm,
Beam is closed in all -fiber signal-pumping that all -fiber signal-pump combiner can be the different structures such as (2+1) × 1, (6+1) × 1
Device, wherein 2+1) × 1 structure all -fiber signal-pump combiner there are two pumping arm, a signal arm and an output arm,
There are six pumping arm, a signal arm and an output arms for all -fiber signal-pump combiner of (6+1) × 1 structure.Wavelength-division is multiple
All -fiber signal-pump combiner signal arm is connected with system, the laser that wavelength-division multiplex system closes beam output passes through all -fiber
Signal-pump combiner signal arm is injected into large mode field Yb dosed optical fiber.All -fiber signal-pump combiner output arm connects
Large mode field Yb dosed optical fiber is connect, host material used by large mode field Yb dosed optical fiber can be Bohemian glass matrix there are many selection
Material (such as silica) is also possible to soft glass material (such as silicate, phosphate).Its fibre core of large mode field Yb dosed optical fiber and
Covering can consider high-power output, the core diameter of large mode field Yb dosed optical fiber is general there are many selection>20 μm, large mode field mix ytterbium
The cladding thickness of optical fiber is general>200μm.Fundamental frequency optical pumping source in hybrid gain fiber amplifier has multiple, all fundamental frequency lights
The structure of pumping source is identical, and each fundamental frequency optical pumping source is connected in each pumping arm of all -fiber signal-pump combiner, each fundamental frequency
The fundamental frequency pump light of optical pumping source output is coupled to large mode field Yb dosed optical fiber by all -fiber signal-pump combiner pumping arm
In.The wavelength of fundamental frequency optical pumping source can be 976nm, 915nm, 960nm, 1018nm etc. there are many selection；Fundamental frequency optical pumping
Source its implementation multiplicity, can be semiconductor laser, optical fiber laser etc..
A kind of output laser parameter measurement system of high-power narrow line width long wave optical-fiber laser generation system, including optical fiber swash
Photosystem array, wavelength-division multiplex system, hybrid gain fiber amplifier, cladding light stripper, end caps, collimator, two colors
Mirror, useless light collector, high reflective mirror, power meter and time domain-spectrum-beam quality integrated measuring system；Wherein hybrid gain
Fiber amplifier includes fundamental frequency optical pumping source, all -fiber signal-pump combiner and large mode field Yb dosed optical fiber；
Fiber laser system array is respectively λ by n central wavelength1、λ2….λnSingle-frequency or more single frequency fiber laser put
Big device or n central wavelength are respectively λ1、λ2….λnSingle-frequency or more single frequency optical fiber lasers constitute；Fiber laser system array
The central wavelength of output n beam single-frequency or more single-frequency lasers, n beam single-frequency or more single-frequency lasers is respectively λ1、λ2….λn, wherein λiIt is full
Sufficient relational expression λi=λi-1+ Δ λ, 2≤i≤n, Δ λ are base used by large mode field Yb dosed optical fiber in hybrid gain fiber amplifier
Frequency shift amount of the corresponding Raman stokes light of material in wavelength domain.
The n beam single-frequency of fiber laser system array output or more single-frequency lasers are injected into wavelength-division multiplex system, through wavelength-division
The laser that multiplex system closes beam output passes through all -fiber signal-pump combiner signal arm in hybrid gain fiber amplifier
It is injected into large mode field Yb dosed optical fiber；The fundamental frequency pump light of fundamental frequency optical pumping source output in hybrid gain fiber amplifier passes through
All -fiber signal-pump combiner pumping arm is coupled in large mode field Yb dosed optical fiber, and hybrid gain fiber amplifier is by drawing
Graceful gain and ytterbium ion gain realize wavelength from λ1To λnConversion and amplification, finally exported through hybrid gain fiber amplifier
Mainly central wavelength is λ in optical-fiber lasernHigh-power narrow line width long wave optical-fiber laser.
The optical-fiber laser exported through hybrid gain fiber amplifier is injected into cladding light stripper, incites somebody to action in cladding light stripper
The cladding light that remaining fundamental frequency pump light and amplification generates filters out；Optical-fiber laser after cladding light stripper passes through end caps
It is exported with beam-expanding collimation after collimator, the optical-fiber laser for collimating output is incident on dichroic mirror, and what is wherein contained in optical-fiber laser puts
After big but the central wavelength of incomplete wavelength convert is λ1、λ2….λn-1Laser be injected into useless light after dichroic mirror transmits and collect
Device, the central wavelength with high light beam quality, bloom spectral purity through dichroic mirror reflection output is λnHigh-power narrow line width it is long
Wave optical-fiber laser is exported to high reflective mirror, and wherein most laser is injected into power meter after high reflective mirror reflects, remaining small portion
Shunt excitation light is injected into time domain-spectrum-beam quality integrated measuring system through what high reflective mirror transmitted, to detect in output
The a length of λ of cardiac wavenHigh-power narrow line width long wave optical-fiber laser time domain specification, spectral characteristic and beam quality.
In the present invention, remaining fundamental frequency pump light and cladding light are filtered out free space by the cladding light stripper,
It prevents fundamental frequency pump light and cladding light from impacting to characteristics such as quality for outputting laser beam, spectral purities, guarantees high beam matter
Amount, the output of bloom spectral purity.
In the present invention, the end caps are that the laser using optical fiber and fused quartz head by fused biconical taper production transmits
Ballistic device can effectively reduce the laser power density of output end face, prevents optics electric discharge, amplification system is caused to damage.
In the present invention, the transmission peak wavelength of the collimator covers λ1To λnEntire wave band, is mainly used for laser beam datum
Transmitting, can be realized by one or more lens combinations, and the material of lens selects multiplicity, can be fused quartz, ZnSe, CaF2
Deng.
In the present invention, the central wavelength that the dichroic mirror is used to not convert completely after amplifying is λ1、λ2….λn-1List
Frequency or more single-frequency lasers and central wavelength are λnSingle-frequency or more single-frequency, narrow-linewidth laser from being spatially separated, finally obtain height
Spectral purity, central wavelength λnNarrow linewidth amplification laser output, constituent material is unlimited, can be fused quartz, K9 etc..
In the present invention, the useless light collector is used to receive and not converted completely after dichroic mirror and remaining middle cardiac wave
A length of λ1、λ2….λn-1Single-frequency or more single-frequency lasers, can be quartzy base cone shape give up light collector, brass base cone shape give up light
Collector etc. is also possible to traditional power measurement receiving device.
In the present invention, the high reflective mirror constituent material is unlimited, can be fused quartz, K9 etc., with specific reference to irradiation laser
Power density selection, central wavelength λnLong wave optical-fiber laser output spectrum its reflect spectral limit in.
In the present invention, the power meter amplifies a length of λ of postwave to reception and measurementnSingle-frequency or more single-frequency, narrow line
The output power of wide long wave optical-fiber laser.
In the present invention, the time domain-spectrum-beam quality integrated measuring system shows mould by photoelectric signal collection
Block, spectral measurement module and beam quality monitoring modular are constituted.Photoelectric signal collection display module generally by photodetector and
Oscillograph is constituted, and incident optical signal can be changed into electric signal and shown in terminal, be λ to observe output center wavelengthn's
The time-domain stability of high-power narrow line width long wave optical-fiber laser；Spectral measurement module is generally by spectrometer, Fabry-Perot-type cavity
(F-P cavity) etc. is constituted, to detect fine structure of spectral line, breadth of spectrum line and light during power ascension of output laser
Compose evolutionary process；Beam quality measurement module is generally beam quality measuring instrument, swashs to observe and measure output long wave optical fiber
The beam quality and far-field spot of light are distributed.
The present invention realizes that the basic principle of high-power narrow line width long wave optical-fiber laser is as follows：
It, must be simultaneously by means of mixing ytterbium ion gain and Raman gain, i.e., in order to realize that large power long wave optical-fiber laser exports
The hybrid gain of the two.In hybrid gain fiber amplifier, line width holding is particularly important.
For directly amplifying by ytterbium ion gain, if thinking, finally obtaining central wavelength is λnNarrow-linewidth laser it is defeated
Out, only needing central wavelength is λnInjection laser be narrow-linewidth laser and injection laser in amplification process without obvious spectrum exhibition
It is wide.Currently, although the directly modes such as narrow linewidth oscillator, narrow-band filtering super-fluorescence light source, narrowband random optical-fiber laser can produce
Raw narrow linewidth injects laser, and spectrum widening, and spectrum widening multiple and amplifier times magnification can be generated in amplification process
Number is positively correlated.Narrow linewidth injection its time domain specification of laser for having its source in above scheme generation for generating spectrum widening is unstable
Fixed, time domain unstability is presented as the broadening of spectral domain.In turn, the unstability that laser temporal is injected in amplification process makes
Amplification laser spectrum constantly broadens.Since time domain and spectral domain are stringent Fourier transformation relationships, theoretically when single-frequency laser
Domain is overstable, and will not introduce additional noise leads to spectrum widening.
Therefore, it is different from above-mentioned narrow linewidth producing method, if central wavelength is λnInjection laser using single-frequency laser or
Single-frequency laser modulates the more single-frequency generated, narrow-linewidth laser through external phase, then the narrow-linewidth laser generated can keep single-frequency to swash
The time-domain stability of light, without obvious spectrum widening in amplification process.Therefore, high-power narrow line width is generated using hybrid gain
One of the key of long wave optical-fiber laser is that central wavelength is λnInjection laser need to be single-frequency laser or single-frequency laser through outside
More single-frequency of phase-modulation generation, narrow-linewidth laser.
In hybrid gain fiber amplifier, for by the amplification of forward pumping Raman gain, raman amplification gain
Noise in time domain unrestraint effect to pump light, i.e., the noise of pump light can be directly passed to amplification laser.Pumping optical time domain is made an uproar
Sound transmission is to meeting after amplification laser along with the spectrum widening of amplification laser.In hybrid gain fiber amplifier, it is amplified and turns
The central wavelength changed is λi-1The laser of (2≤i≤n) is that lower single order central wavelength is λiThe pump light of the laser of (2≤i≤n),
I.e. in addition to central wavelength is λnFinal amplification laser, remaining wavelength laser amplification conversion process in can play the part of pump light
Role.It therefore, is λ to rely on Raman gain realization central wavelength in hybrid gain fiber amplifiernNarrow linewidth amplification
Laser output, also needing central wavelength is λ1、λ2….λn-1Injection laser temporal it is overstable, this requires central wavelengths to be
λ1、λ2….λn-1Injection laser be single-frequency or more single-frequency lasers.Since raman gain spectrum is wider, for specific central wavelength,
More single-frequency lasers can be generated by external phase modulation, can also be closed beam by more single-frequency lasers and be generated.Further, since Raman gain
Compose wider, central wavelength λ1、λ2….λn-1Injection laser can be not necessarily narrow-linewidth laser.
Compared with prior art, the present invention can generate following technical effect：
1, present invention influence of the comprehensive utilization raman pump light time-frequency characteristic to Raman amplifiction laser spectrum spreading characteristic and
Ytterbium ion gain directly amplifies influence of the lower injection laser time-frequency characteristic to amplification laser spectrum spreading characteristic, real from injection laser
Existing mode, raman pump light generation form etc. effectively inhibit the spectrum widening in hybrid gain long wave fiber amplifier, provide
A kind of high-power narrow line width long wave optical-fiber laser generation system.In the system, central wavelength λ1、λ2….λnSingle-frequency or more
Single frequency fiber laser is just converted by just being amplified in hybrid gain fiber amplifier after wavelength-division multiplex system, final to obtain
Central wavelength is λnHigh-power narrow line width long wave optical-fiber laser output；As 2≤i≤n, λiMeet relational expression λi=λi-1+Δ
λ, Δ λ be hybrid gain fiber amplifier in the corresponding Raman stokes light of matrix material of optic fibre wavelength domain frequency shift amount；
The key of the system is：Central wavelength is λnInjection laser need to for single-frequency laser or through external phase modulation generate
More single-frequency, narrow-linewidth laser；Central wavelength is respectively λ1、λ2…λn-1Injection laser need to be that single-frequency laser or more single-frequency swash
Light；It is respectively λ for central wavelength since raman gain spectrum is wider1、λ2…λn-1In specific central wavelength, more single-frequency lasers
It can modulate and generate through external phase, beam can also be closed by discrete more single-frequency lasers and generated；Further, since raman gain spectrum is wider,
Central wavelength is that center wavelength is respectively λ1、λ2…λn-1Injection laser can be not necessarily narrow-linewidth laser.
2, external modulation signal way of realization multiplicity when generating more single-frequency lasers is modulated in the present invention through external phase, it can be with
It is sine, white noise, pseudo-random phase coding etc., is also possible to any combination of above-mentioned different modulated signals.
3, the present invention has versatility：For wave-length coverage being amplified, by determining λ1Value and hybrid gain light
The host material of optical fiber in fiber amplifier, this method can be used for the amplification of any wavelength of 1000nm~1300nm, and can be further
It is expanded to more long wavelength.
4, in the present invention, wavelength-division multiplex system implementation is unlimited, can be more tail optical fiber injections, single tail optical fiber exports, is multiple
The integrated wavelength division multiplexer of (m × 1, m are to inject fine number, 1 for export fine number) that micro-optics membrane combination is realized, can also be with
It is multiple cascade wavelength-division multiplex systems of 2 × 1 wavelength division multiplexer；All -fiber signal-pumping is closed in hybrid gain fiber amplifier
Beam device can be the different structures such as (2+1) × 1, (6+1) × 1, and large mode field Yb dosed optical fiber host material can be there are many selection, can be with
It is Bohemian glass host material (such as silica), is also possible to soft glass material (such as silicate, phosphate)；Large mode field mixes ytterbium
Fiber core and covering can there are many selections；Fundamental frequency optical pumping source wavelength can there are many selection, can be 976nm, 915nm,
960nm, 1018nm etc., implementation multiplicity, can be semiconductor laser, optical fiber laser etc..
Detailed description of the invention
Fig. 1 is a kind of output laser parameter measurement system of high-power narrow line width long wave optical-fiber laser generation system of the present invention
System structure diagram.
Fig. 2 is a typical case exemplary diagram of the invention：1178nm high-power narrow line width optical-fiber laser generation system knot
Structure schematic diagram.
Specific embodiment
With reference to the accompanying drawing, embodiments of the present invention are described in further detail.
Fig. 1 is a kind of output laser parameter measurement system of high-power narrow line width long wave optical-fiber laser generation system of the present invention
System structure diagram, as shown in Figure 1, include fiber laser system array 1-1, wavelength-division multiplex system 1-2, hybrid gain light
Fiber amplifier 1-3, cladding light stripper 1-4, end caps 1-5, collimator 1-6, dichroic mirror 1-7, useless light collector 1-8, height
Anti- mirror 1-9, power meter 1-10, time domain-spectrum-beam quality integrated measuring system 1-11.
In Fig. 1, fiber laser system array 1-1, wavelength-division multiplex system 1-2, hybrid gain fiber amplifier 1-3 can structures
At high-power narrow line width long wave optical-fiber laser generation system.Fiber laser system array 1-1 is by n different central wavelengths (center
Wavelength is respectively λ1、λ2….λn) single-frequency or more single frequency optical fiber lasers or optical fiber laser amplifier constitute, be successively center wave
A length of λ1Single-frequency or more single frequency optical fiber lasers or optical fiber laser amplifier 1-1,1, central wavelength λ2Single-frequency or more single-frequency
Optical fiber laser or optical fiber laser amplifier 1-1,2 ... central wavelength are λn-1Single-frequency or more single frequency optical fiber lasers or light
Fine laser amplifier 1-1, n-1, central wavelength λnSingle-frequency or more single frequency optical fiber lasers or optical fiber laser amplifier 1-1,
n。
Fiber laser system array 1-1 exports n beam single-frequency or more single-frequency lasers, the center of n beam single-frequency or more single-frequency lasers
Wavelength is respectively λ1、λ2….λn, wherein λ1>1000nm, λn<1300nm, λiMeet relational expression λiMeet relational expression λi=λi-1+Δ
λ, 2≤i≤n, Δ λ are large mode field Yb dosed optical fiber 1-3 in hybrid gain fiber amplifier 1-3, and host material used by 2 is corresponding
Raman stokes light wavelength domain frequency shift amount.
All -fiber signal-pump combiner 1-3,1, large mode field Yb dosed optical fiber 1-3,2 and fundamental frequency optical pumping source 1-3,3 are constituted
Hybrid gain fiber amplifier 1-3.Fundamental frequency optical pumping source 1-3 in hybrid gain fiber amplifier 1-3,3 have multiple, Suo Youji
Frequency optical pumping source 1-3,3 structure is identical, and fundamental frequency optical pumping source 1-3,3 use semiconductor laser or optical fiber laser.Respectively
Fundamental frequency optical pumping source 1-3,3 is connected in each pumping arm of all -fiber signal-pump combiner 1-3,1.
The n beam single-frequency of fiber laser system array 1-1 output or more single-frequency lasers are first poured into wavelength-division multiplex system 1-2
Synthesize beam of laser output；The laser for closing beam output through wavelength-division multiplex system 1-2 passes through all -fiber signal-pump combiner 1-
3,1 signal arm is injected into large mode field Yb dosed optical fiber 1-3,2.The fundamental frequency pump light of each fundamental frequency optical pumping source 1-3,3 output is logical
Each pumping arm of all -fiber signal-pump combiner 1-3,1 is crossed to be coupled in large mode field Yb dosed optical fiber 1-3,2.Hybrid gain light
Fiber amplifier 1-3 realizes wavelength from λ by Raman gain and ytterbium ion gain1To λnConversion and amplification, it is final realize in cardiac wave
A length of λnHigh-power narrow line width long wave optical-fiber laser output.
Further, in order to guarantee final output central wavelength be λnHigh-power narrow line width long wave optical-fiber laser have
High light beam quality, bloom spectral purity.High-power narrow line width long wave optical-fiber laser generation system in Fig. 1 further includes that cladding light filters out
Device 1-4, end caps 1-5, collimator 1-6, dichroic mirror 1-7 and useless light collector 1-8.Through hybrid gain fiber amplifier 1-3
The optical-fiber laser of output is injected into cladding light stripper 1-4, in cladding light stripper 1-4 by remaining fundamental frequency pump light and amplification
The cladding light of generation filters out；Optical-fiber laser after cladding light stripper 1-4 expands after end caps 1-5 and collimator 1-6
Beam collimation output, the optical-fiber laser for collimating output is incident on dichroic mirror 1-7, after the amplification wherein contained in optical-fiber laser but not complete
The central wavelength that all-wave length is converted is λ1、λ2….λn-1Laser through dichroic mirror 1-7 transmission after be injected into useless light collector 1-8, pass through
The central wavelength as with high light beam quality, bloom spectral purity of dichroic mirror 1-7 reflection output is λnHigh-power narrow line width
Long wave optical-fiber laser.
The central wavelength for defining fiber laser system array 1-1 output is λ1Laser be fundamental frequency light, fiber laser system
The central wavelength of array 1-1 output is λ2Laser be 1 rank excited Raman stokes light, and so on, fiber laser system
The central wavelength of array 1-1 output is λnLaser be n-1 rank excited Raman stokes light.Hybrid gain fiber amplifier 1-
Large mode field Yb dosed optical fiber 1-3,2 in 3 carries out pumping using the fundamental frequency pump light that fundamental frequency optical pumping source 1-3,3 is exported.It is specific and
Speech, central wavelength λ1Fundamental frequency light amplified under the pumping of fundamental frequency pump light；Amplified central wavelength is λ1Fundamental frequency
Light serves as the pump light of 1 rank excited Raman stokes light, and amplified central wavelength is λ1Fundamental frequency optical pumping large mode field mix
It is λ that ytterbium optical fiber 1-3,2, which amplifies central wavelength,21 rank excited Raman stokes light；Amplified 1 rank excited Raman stoke
This light serves as the pump light of 2 rank excited Raman stokes lights, amplified 1 rank excited Raman Stokes optical pumping large mode field
It is λ that Yb dosed optical fiber 1-3,2, which amplifies central wavelength,32 rank excited Raman stokes lights；And so on, amplified n-2 rank by
Swash the pump light that Raman stokes light serves as n-1 rank excited Raman stokes light, this support of amplified n-2 rank excited Raman
Gram this optical pumping large mode field Yb dosed optical fiber 1-3,2 amplification central wavelength is λnN-1 rank excited Raman stokes light.In big mould
Yb dosed optical fiber 1-3 realizes the wavelength convert in amplification in 2, final to realize that central wavelength is λnHigh-power narrow line width long wave
Optical-fiber laser output.
Fig. 1 is a kind of output laser parameter measurement system of high-power narrow line width long wave optical-fiber laser generation system of the present invention
System structure diagram, including by fiber laser system array 1-1, wavelength-division multiplex system 1-2, hybrid gain fiber amplifier
The big function that 1-3, cladding light stripper 1-4, end caps 1-5, collimator 1-6, dichroic mirror 1-7 and useless light collector 1-8 are constituted
Rate narrow linewidth long wave optical-fiber laser generation system and by high reflective mirror 1-9, power meter 1-10 and time domain-spectrum-beam quality one
The laser parameter measurement system that body measuring system 1-11 is constituted.There is high light beam quality, height through dichroic mirror 1-7 reflection output
The central wavelength of spectral purity is λnHigh-power narrow line width long wave optical-fiber laser export to high reflective mirror 1-9.It is anti-through high reflective mirror 1-9
The most of light beam penetrated is injected into power meter 1-10, and the fraction laser transmitted through high reflective mirror 1-9 injects then domain-spectrum-light
Beam quality integrated measuring system 1-11, to detect time domain specification, spectral characteristic and the light beam matter of output long wave optical-fiber laser
Amount.Time domain-spectrum-beam quality integrated measuring system 1-11 is by photoelectric signal collection display module 1-11,1, spectral measurement
Module 1-11,2 and beam quality monitoring modular 1-11,3 is constituted.
Example -1178nm high-power narrow line width optical-fiber laser generation system (system is typically applied below in conjunction with one
Structural schematic diagram is as shown in Fig. 2), the specific implementation process of the technological invention is illustrated, the scope of application of technological invention
It is not limited to the typical case.
Referring to Fig. 2, in the present embodiment：Fiber laser system array 1-1, wavelength-division multiplex system 1-2, hybrid gain optical fiber are put
Big device 1-3, cladding light stripper 1-4, end caps 1-5, collimator 1-6, dichroic mirror 1-7, useless light collector 1-8, high reflective mirror
1-9, power meter 1-10, time domain-spectrum-beam quality integrated measuring system 1-11.
Wherein fiber laser system array 1-1 is the single-frequency of 1078nm or more single frequency optical fiber lasers or light by central wavelength
Fine laser amplifier 1-1,1, the single-frequency that central wavelength is 1128nm or more single frequency optical fiber lasers or optical fiber laser amplifier 1-
The single-frequency of 1,2 and 1178nm or more single frequency optical fiber lasers or optical fiber laser amplifier 1-1,3 are constituted.
Hybrid gain fiber amplifier 1-3 by (6+1) × 1 structure all -fiber signal-pump combiner 1-3,1, big mould
Field Yb dosed optical fiber 1-3,2 and fundamental frequency optical pumping source 1-3,3 is constituted.Fundamental frequency optical pumping source 1-3,3 is 6.
Time domain-spectrum-beam quality integrated measuring system 1-11 is by photoelectric signal collection display module 1-11,1, spectrum
Measurement module 1-11,2 and beam quality monitoring modular 1-11,3 is constituted.
If gain fibre host material is silica, corresponding Raman Stokes in hybrid gain fiber amplifier
Light wavelength domain frequency shift amount Δ λ=50nm, if want generate 1178nm high-power narrow line width optical-fiber laser, settable λ1=
1078nm、λ2=1128nm.Specific embodiment is as follows：As shown in Fig. 2, central wavelength be respectively 1078nm, 1128nm,
The single-frequency of 1178nm or the laser of more single frequency fiber laser system array 1-1 output pass through wavelength-division multiplex system 1-2 first and synthesize
For beam of laser output；Single-frequency or more single frequency fiber laser system array 1- of the central wavelength for 1078nm, 1128nm, 1178nm
1 by central wavelength is respectively the single-frequency of 1078nm, 1128nm or the single-frequency of more single frequency optical fiber lasers or amplifier and 1178nm
Or more single-frequency, narrow cable and wide optical fiber laser or amplifier are constituted.The laser for closing beam output through wavelength-division multiplex system 1-2 passes through (6+
1) × 1 all -fiber signal-pump combiner 1-3,1 signal arm is injected into large mode field Yb dosed optical fiber 1-3,2.Fundamental frequency optical pumping
Source 1-3,3 is made of the semiconductor laser that 6 central wavelengths are 976nm.The pumping light that each fundamental frequency optical pumping source 1-3,3 is generated
It is coupled in large mode field Yb dosed optical fiber 1-3,2 by 6 pumping arms of (6+1) × 1 all -fiber signal-pump combiner 1-3,1.
Fibre core covering can be selected than the large mode field Double Cladding Ytterbium Doped Fiber for 20/400 μm in large mode field Yb dosed optical fiber 1-3,2.(6+1)×1
All -fiber signal-pump combiner 1-3,1, the large mode field Yb dosed optical fiber 1-3,2 of structure and 6 fundamental frequency optical pumping source 1-3,3 structures
At hybrid gain fiber amplifier 1-3.Hybrid gain fiber amplifier 1-3 realizes wavelength by Raman gain and ytterbium ion gain
Conversion and amplification from 1078nm to 1178nm, it is final to realize that the high-power narrow line width long wave optical fiber that central wavelength is 1178nm swashs
Light output.Specifically, central wavelength is the fundamental frequency light of 1078nm in 976nm fundamental frequency pumping source 1-3, put under 3 pumping
Greatly；The fundamental frequency light that amplification rear center's wavelength is 1078nm serves as the 1 rank excited Raman stokes light that central wavelength is 1128nm
Pump light, pumping large mode field Yb dosed optical fiber 1-3, the 1 rank excited Raman stokes light that 2 amplification central wavelengths are 1128nm；
The 1 rank excited Raman stokes light that amplification rear center's wavelength is 1128nm serves as 2 ranks that central wavelength is 1178nm and is excited to draw
The pump light of graceful stokes light, pumping large mode field Yb dosed optical fiber 1-3,2 generate the 2 rank excited Ramans that central wavelength is 1178nm
Stokes light, it is final to realize that the high-power narrow line width long wave optical-fiber laser that central wavelength is 1178nm exports.
The laser exported through hybrid gain fiber amplifier 1-3 is injected into cladding light stripper 1-4, cladding light stripper 1-
4 filter out the cladding light that remaining fundamental frequency pump light and amplification generate.Optical-fiber laser after cladding light stripper 1-4 passes through light
Beam-expanding collimation is output to free space after fine end cap 1-5 and collimator 1-6.The optical-fiber laser of collimation output passes through dichroic mirror 1-7
Afterwards, the central wavelength that do not convert completely after amplification is injected into useless light collector 1- into the laser of 1078nm and 1128nm after transmiting
8, central wavelength is that the narrow linewidth long wave optical-fiber laser of 1178nm reflexes to high reflective mirror 1-9.The major part reflected through high reflective mirror 1-9
Light beam is injected into power meter 1-10, and then domain-spectrum-beam quality is integrated for the fraction laser injection transmitted through high reflective mirror 1-9
Change measuring system 1-11, to detect time domain specification, spectral characteristic and the beam quality of output long wave optical-fiber laser.
The foregoing is merely a preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of high-power narrow line width long wave optical-fiber laser generation system, it is characterised in that：Including fiber laser system array, wave
Division multiplexing system and hybrid gain fiber amplifier；Wherein hybrid gain fiber amplifier includes fundamental frequency optical pumping source, all -fiber
Signal-pump combiner and large mode field Yb dosed optical fiber；
Fiber laser system array is respectively λ by n central wavelength1、λ2….λnSingle-frequency or more single frequency fiber laser amplifiers
Or n central wavelength is respectively λ1、λ2….λnSingle-frequency or more single frequency optical fiber lasers constitute；
Fiber laser system array exports n beam single-frequency or more single-frequency lasers, the central wavelength difference of n beam single-frequency or more single-frequency lasers
For λ1、λ2….λn, wherein λ1>1000nm, λn<1300nm, λiMeet relational expression λiMeet relational expression λi=λi-1+ Δ λ, 2≤i≤
N, Δ λ are the corresponding Raman stokes light of host material used by large mode field Yb dosed optical fiber in hybrid gain fiber amplifier
In the frequency shift amount of wavelength domain；
The n beam single-frequency of fiber laser system array output or more single-frequency lasers are injected into wavelength-division multiplex system, through wavelength-division multiplex
The laser that system closes beam output passes through all -fiber signal-pump combiner signal arm injection in hybrid gain fiber amplifier
Into large mode field Yb dosed optical fiber；The fundamental frequency pump light of fundamental frequency optical pumping source output in hybrid gain fiber amplifier passes through full light
Optical fiber signaling-pump combiner pumping arm is coupled in large mode field Yb dosed optical fiber, and hybrid gain fiber amplifier increases by Raman
Benefit and ytterbium ion gain realize wavelength from λ1To λnConvert and amplification after output center wavelength into λnHigh-power narrow line width long wave
Optical-fiber laser.
2. high-power narrow line width long wave optical-fiber laser generation system according to claim 1, it is characterised in that：Define optical fiber
The central wavelength of laser system array output is λ1Laser be fundamental frequency light, fiber laser system array output central wavelength be
λ2Laser be 1 rank excited Raman stokes light, and so on, fiber laser system array output central wavelength be λn's
Laser is n-1 rank excited Raman stokes light；
Large mode field Yb dosed optical fiber in hybrid gain fiber amplifier is carried out using the fundamental frequency pump light that fundamental frequency optical pumping source exports
Pumping；In hybrid gain fiber amplifier, central wavelength λ1Fundamental frequency light amplified under the pumping of fundamental frequency pump light；
Amplified central wavelength is λ1Fundamental frequency light serve as the pump light of 1 rank excited Raman stokes light, amplified middle cardiac wave
A length of λ1Fundamental frequency optical pumping large mode field Yb dosed optical fiber amplification central wavelength be λ21 rank excited Raman stokes light；After amplification
1 rank excited Raman stokes light serve as the pump lights of 2 rank excited Raman stokes lights, amplified 1 rank excited Raman
It is λ that Stokes optical pumping large mode field Yb dosed optical fiber, which amplifies central wavelength,32 rank excited Raman stokes lights；And so on,
Amplified n-2 rank excited Raman stokes light serves as the pump light of n-1 rank excited Raman stokes light, amplified n-
It is λ that 2 rank excited Raman Stokes optical pumping large mode field Yb dosed optical fibers, which amplify central wavelength,nN-1 rank excited Raman stoke
This light.
3. high-power narrow line width long wave optical-fiber laser generation system according to claim 1, it is characterised in that：It further include packet
Layer light stripper, end caps, collimator, dichroic mirror, useless light collector；
The optical-fiber laser exported through hybrid gain fiber amplifier is injected into cladding light stripper, cladding light stripper will be remaining
Fundamental frequency pump light and amplification generate cladding light filter out；Optical-fiber laser after cladding light stripper passes through end caps and standard
Beam-expanding collimation exports after straight device, and the optical-fiber laser for collimating output is incident on dichroic mirror, after the amplification wherein contained in optical-fiber laser
But the central wavelength of incomplete wavelength convert is λ1、λ2….λn-1Laser useless light collector is injected into after dichroic mirror transmits, pass through
The central wavelength as with high light beam quality, bloom spectral purity of dichroic mirror reflection output is λnHigh-power narrow line width long wave
Optical-fiber laser.
4. high-power narrow line width long wave optical-fiber laser generation system according to claim 1,2 or 3, it is characterised in that：Light
The central wavelength of fiber laser system array output is λ1、λ2….λn-1Laser be single-frequency laser or be more single-frequency lasers；
The central wavelength of fiber laser system array output is λnLaser be single-frequency laser；Or fiber laser system array is defeated
Central wavelength out is λnLaser be more single-frequency, narrow-linewidth laser, wherein more single-frequency, narrow-linewidth laser are by single-frequency laser through outer
Portion's phase-modulation generates.
5. high-power narrow line width long wave optical-fiber laser generation system according to claim 4, it is characterised in that：The wavelength-division
Multiplex system is the integrated wavelength division multiplexer realized by the injection of more tail optical fibers, single tail optical fiber output, multiple micro-optics membrane combinations；Or
Wavelength-division multiplex system described in person is the wavelength-division multiplex system as made of the cascade of multiple 2 × 1 wavelength division multiplexers.
6. high-power narrow line width long wave optical-fiber laser generation system according to claim 4, it is characterised in that：All -fiber letter
Number-pump combiner is made of signal arm, fundamental frequency light pumping arm, output arm, all -fiber signal-pump combiner uses (2+1)
× 1 or (6+1) × 1 structure all -fiber signal-pump combiner, wherein all -fiber signal of (2+1) × 1 structure-pumping closes
There are two pumping arm, a signal arm and an output arm, all -fiber signal-pump combiners of (6+1) × 1 structure to have for beam device
Six pumping arms, a signal arm and an output arm.
7. high-power narrow line width long wave optical-fiber laser generation system according to claim 6, it is characterised in that：All -fiber letter
Number-output arm of pump combiner connects large mode field Yb dosed optical fiber, host material used by large mode field Yb dosed optical fiber is hard glass
Glass host material or soft glass material, wherein Bohemian glass host material such as silica, soft glass material such as silicate or phosphorus
Hydrochlorate；The core diameter of large mode field Yb dosed optical fiber>20 μm, the cladding thickness of large mode field Yb dosed optical fiber>200μm.
Fundamental frequency optical pumping source in hybrid gain fiber amplifier has multiple, and the structure of all fundamental frequency optical pumping sources is identical, fundamental frequency
Optical pumping source uses semiconductor laser or optical fiber laser, and each fundamental frequency optical pumping source is connected to all -fiber signal-pumping and closes
In each pumping arm of beam device, the fundamental frequency pump light of each fundamental frequency optical pumping source output passes through all -fiber signal-pump combiner pump
Pu arm is coupled in large mode field Yb dosed optical fiber, and the wavelength of fundamental frequency optical pumping source is 976nm, 915nm, 960nm or 1018nm；Fundamental frequency
Optical pumping source its be achieved in that semiconductor laser or optical fiber laser.
8. a kind of output laser parameter measurement system of high-power narrow line width long wave optical-fiber laser generation system, including optical-fiber laser
Systems array, wavelength-division multiplex system, hybrid gain fiber amplifier, cladding light stripper, end caps, collimator, dichroic mirror,
Useless light collector, high reflective mirror, power meter and time domain-spectrum-beam quality integrated measuring system；Wherein hybrid gain optical fiber
Amplifier includes fundamental frequency optical pumping source, all -fiber signal-pump combiner and large mode field Yb dosed optical fiber；
Fiber laser system array is respectively λ by n central wavelength1、λ2….λnSingle-frequency or more single frequency fiber laser amplifiers
Or n central wavelength is respectively λ1、λ2….λnSingle-frequency or more single frequency optical fiber lasers constitute；The output of fiber laser system array
The central wavelength of n beam single-frequency or more single-frequency lasers, n beam single-frequency or more single-frequency lasers is respectively λ1、λ2….λn, wherein λiMeet and closes
It is formula λi=λi-1+ Δ λ, 2≤i≤n, Δ λ are matrix material used by large mode field Yb dosed optical fiber in hybrid gain fiber amplifier
Expect corresponding Raman stokes light in the frequency shift amount of wavelength domain；
The n beam single-frequency of fiber laser system array output or more single-frequency lasers are injected into wavelength-division multiplex system, through wavelength-division multiplex
The laser that system closes beam output passes through all -fiber signal-pump combiner signal arm injection in hybrid gain fiber amplifier
Into large mode field Yb dosed optical fiber；The fundamental frequency pump light of fundamental frequency optical pumping source output in hybrid gain fiber amplifier passes through full light
Optical fiber signaling-pump combiner pumping arm is coupled in large mode field Yb dosed optical fiber, and hybrid gain fiber amplifier increases by Raman
Benefit and ytterbium ion gain realize wavelength from λ1To λnConversion and amplification, the optical fiber finally exported through hybrid gain fiber amplifier
Mainly central wavelength is λ in lasernHigh-power narrow line width long wave optical-fiber laser；
The optical-fiber laser exported through hybrid gain fiber amplifier is injected into cladding light stripper, cladding light stripper will be remaining
Fundamental frequency pump light and amplification generate cladding light filter out；Optical-fiber laser after cladding light stripper passes through end caps and standard
Beam-expanding collimation exports after straight device, and the optical-fiber laser for collimating output is incident on dichroic mirror, after the amplification wherein contained in optical-fiber laser
But the central wavelength of incomplete wavelength convert is λ1、λ2….λn-1Laser useless light collector is injected into after dichroic mirror transmits, pass through
The central wavelength with high light beam quality, bloom spectral purity of dichroic mirror reflection output is λnHigh-power narrow line width long wave optical fiber
Laser is exported to high reflective mirror, and wherein most laser is injected into power meter after high reflective mirror reflects, remaining fraction laser
It is injected into time domain-spectrum-beam quality integrated measuring system through what high reflective mirror transmitted, to detect output center wavelength
For λnHigh-power narrow line width long wave optical-fiber laser time domain specification, spectral characteristic and beam quality.
9. the output laser parameter measurement system of high-power narrow line width long wave optical-fiber laser generation system according to claim 8
System, it is characterised in that：Time domain-spectrum-beam quality integrated measuring the system is by photoelectric signal collection display module, light
Spectrometry module and beam quality monitoring modular are constituted；Incident optical signal is changed into electric signal by photoelectric signal collection display module
And it is shown in terminal, the central wavelength to observe output is λnHigh-power narrow line width long wave optical-fiber laser long wave optical-fiber laser
Time-domain stability；Central wavelength of the spectral measurement module generally to detect output is λnHigh-power narrow line width long wave optical fiber
Fine structure of spectral line, breadth of spectrum line and spectrum evolutionary process during power ascension of laser；Beam quality measures mould
Block is λ to the central wavelength for observing and measuring outputnHigh-power narrow line width long wave optical-fiber laser beam quality and far field
Hot spot distribution.
10. the output laser parameter measurement of high-power narrow line width long wave optical-fiber laser generation system according to claim 9
System, it is characterised in that：Photoelectric signal collection display module includes photodetector and oscillograph；Spectral measurement module includes light
Spectrometer, Fabry-Perot-type cavity；Beam quality measurement module is beam quality measuring instrument.
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