CN108692918A - Device and method for evaluating time domain stability of high-power optical fiber laser system - Google Patents
Device and method for evaluating time domain stability of high-power optical fiber laser system Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
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- -1 ytterbium ion Chemical class 0.000 claims description 9
- 229910052689 Holmium Inorganic materials 0.000 claims description 6
- 229910052775 Thulium Inorganic materials 0.000 claims description 6
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 6
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- 229910052691 Erbium Inorganic materials 0.000 claims description 3
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- 239000010453 quartz Substances 0.000 claims description 3
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 2
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Abstract
The invention provides a device and a method for evaluating the time domain stability of a high-power fiber laser system, which comprises a high-power fiber laser system to be tested, a wavelength tunable ultra-low noise fiber laser, a wavelength division multiplexer, an energy transmission fiber, a collimator, a band-pass filter, a power meter and a waste light collector, wherein the high-power fiber laser system to be tested is connected with the energy transmission fiber; by analysing the central wavelength to be λ2The Raman amplification laser conversion efficiency and the central wavelength output by the high-power fiber laser system to be detected are lambda1The dependence relationship between the time domain stability of the pump laser is calculated by measuring the output power of the Raman amplification signal light, and the Raman conversion efficiency is compared with the Raman amplification light power and the conversion efficiency which are calculated under the ideal condition without time domain fluctuation, so that the time domain stability of the high-power optical fiber laser system to be tested can be evaluated. The invention evaluates the time domain stability of the high-power optical fiber laser system based on a pure optical detection method, and can avoid the problems of limited bandwidth, high system cost and the like in the traditional photoelectric detection method.
Description
Technical field
The invention belongs to High-power Laser Technologies fields, and high power light is evaluated based on pure optical detecting method more particularly to one kind
The device and method of fiber laser system time-domain stability.
Background technology
High power optical fibre laser system time-domain stability is probed into for Fibre Optical Sensor, optical-fibre communications, gravitational wave detection, non-thread
Property the fields such as optical fiber optics, large-power optical fiber laser system there is important scientific meaning and engineering value.
Specifically, in fields such as Fibre Optical Sensor, optical-fibre communications, gravitational wave detections, fiber laser system time-domain stability
Directly determine sensing, communication and the accuracy and sensitivity of detection.In nonlinear fiber optics application field, fiber laser system
Time-domain stability directly determines the nonlinear effects such as stimulated Brillouin scattering, stimulated Raman scattering, the Self-phase modulation of system
Kinetic characteristics.In large-power optical fiber laser field, time-domain stability directly determines the Amplified Spontaneous spoke of optical fiber amplification system
It penetrates, the nonlinear effects threshold property such as stimulated Brillouin scattering, the unstable, stimulated Raman scattering of thermotropic pattern.It is above-mentioned non-linear
Threshold property directly determines the power ascension potentiality of fiber laser system.
Conventional method is directly detected and is evaluated the time-domain stability of high power optical fibre laser system by photodetection means.
This method can intuitively react distribution character of the output laser on different time scales, and then by Annual distribution characteristic to laser
Time-domain stability is analyzed.However, this method depends critically upon sensitive detection parts and photoelectric signal processor (such as oscillograph)
Responsive bandwidth.Scale is probed into laser system time-domain stability further to develop to microcosmicization, photodetection and processing mould
The bandwidth of block can seriously restrict the evaluation of seed time-domain stability quality.In addition, high bandwidth photodetection processing module exist at
This high deficiency.Compared with Traditional photovoltaic detects, pure optical detection diagnosis has responsive bandwidth height, fast response time etc. special
Advantage.
Therefore, designing the device for evaluating high power optical fibre laser system time-domain stability with pure optical detecting method has
Important scientific meaning and urgent reality need.
Invention content
In view of the defects existing in the prior art, the present invention provides a kind of steady for evaluating high power optical fibre laser system time domain
Qualitative device and method, the device provided are steady based on pure optical detecting method evaluation high power optical fibre laser system time domain
Qualitative device, can to avoid Bandwidth-Constrained present in Traditional photovoltaic detection method, system cost is expensive the problems such as.
To realize the above-mentioned technical purpose, the technical scheme is that:
Device for evaluating high power optical fibre laser system time-domain stability, including high power optical fibre laser system to be measured
System, tunable wave length ultra-low noise optical fiber laser, wavelength division multiplexer, energy-transmission optic fibre, collimator, bandpass filter, power meter,
Useless light collector;
Its output laser center wavelength of the high power optical fibre laser system to be measured is λ1, the tunable wave length super-low noise
Its output laser center wavelength of acousto-optic fibre laser is λ2, the Raman Stokes shift corresponding to its host material of energy-transmission optic fibre
Amount is Δ λR, wherein its output laser center wavelength of tunable wave length ultra-low noise optical fiber laser λ2=λ1+ΔλR;
The high power optical fibre laser system to be measured and the laser of tunable wave length ultra-low noise optical fiber laser output are logical
It crosses wavelength division multiplexer and synthesizes beam of laser output, close the laser beam after beam and be injected into energy-transmission optic fibre, exported through energy-transmission optic fibre
Laser beam collimator collimation output, from collimator export laser beam by being divided into two bundles respectively after bandpass filter in
The a length of λ of cardiac wave2Raman amplifiction laser and remaining centre wavelength be λ1Laser, wherein centre wavelength be λ2Raman amplifiction
Laser is injected into power meter, and remaining centre wavelength is λ1Laser be injected into useless light collector.
In the present invention, that is, above-mentioned device for evaluating high power optical fibre laser system time-domain stability, high power light to be measured
The laser of fiber laser system output serves as pumping laser, and the laser of tunable ultra-low noise optical fiber laser output serves as signal and swashs
Light, energy-transmission optic fibre provide Raman gain, constitute the Raman fiber laser amplifier structure of a forward pumping in this way.
The basic principle that the present invention evaluates high power optical fibre laser system time-domain stability with pure optical detecting method is as follows:
It is λ by analysis center's wavelength2Raman amplifiction laser-conversion efficiency and centre wavelength be λ1Pumping laser (high power to be measured
The laser of fiber laser system output) dependence between time-domain stability, pass through the output work for measuring Raman amplifiction laser
Rate, and then the Raman amplifiction laser that Raman light conversion efficiency is calculated, and is ideally calculated with the fluctuating of no time domain
Power and Raman light conversion efficiency compare, you can evaluate the time-domain stability of high power optical fibre laser system to be measured.
Specifically, based on the above-mentioned device for evaluating high power optical fibre laser system time-domain stability, the present invention provides
A method of evaluation high power optical fibre laser system time-domain stability includes the following steps:
(1) power and central wavelength lambda of high power optical fibre laser system output laser to be measured are measured1。
(2) determine the energy-transmission optic fibre used in device for evaluating high power optical fibre laser system time-domain stability and
Raman Stokes shift amount Δ λ corresponding to its host material of its energy-transmission optic fibreR。
(3) central wavelength lambda of tunable wave length ultra-low noise optical fiber laser output laser is determined2, λ2=λ1+ΔλR。
(4) output power of tunable wave length ultra-low noise optical fiber laser output laser is measured.
(5) core size and length of energy-transmission optic fibre are determined;And it calculates and rises and falls ideally Raman amplifiction without time domain
Laser power and Raman light conversion efficiency.
Energy-transmission optic fibre core size, the determination method of length and Raman amplifiction laser work(when ideally rising and falling without time domain
The process that rate and Raman light conversion efficiency calculate is as described below:
The Raman amplifiction process comprising pumping laser time domain specification passes through in forward pumping Raman fiber laser amplifier structure
Forward direction coupled amplitude equation describes, as described below:
Wherein:EpAnd EsRespectively represent the light field of pumping laser and signal laser, νgpAnd νgsRespectively represent pumping laser and
The group velocity of signal laser, β2pAnd β2sRespectively represent the group velocity dispersion coefficient of pumping laser and signal laser, αpAnd αsRespectively
Represent the loss factor of pumping laser and signal laser, δRFor variations in refractive index caused by Raman, fRIt is to postpone Raman response to non-
The decimal contribution linearly planned, gpAnd gsThe Raman gain coefficienct of pumping laser and signal laser is indicated respectively;γpAnd γsRespectively
The Kerr coefficient for representing pumping laser and signal laser, is expressed as:
Wherein, n2For nonlinear refractive index, AeffFor the effective core area of energy-transmission optic fibre.AeffWith energy-transmission optic fibre fibre core half
Dependence between diameter (a) is expressed as:
Aeff=Γ π a2 (3)
Wherein, Γ is relative scale coefficient, and general value is between 0.8~1.
The light field E of pumping laser and signal laserpAnd EsMeet between pump laser power and signal laser power:
Wherein:Z is along the distance parameter of the length direction of energy-transmission optic fibre, z [0, L], indicate to pass energy light as z=0
Fine input terminal, when z=L, indicate the output end of energy-transmission optic fibre.dσFor along the effective core area A of energy-transmission optic fibreeffIntegral,
Referring to formula (3), it is directly related with energy-transmission optic fibre fiber core radius (a).
If signal laser (laser of i.e. tunable ultra-low noise optical fiber laser output) power of injection is Ps(0), it notes
Pumping laser (laser of the high power optical fibre laser system output i.e. to be measured) power entered is Pp(0), using formula (1)-(4),
Can be calculated high power optical fibre laser system to be measured no time domain rise and fall ideally when Raman amplifiction laser power edge
The distribution P of energy-transmission optic fibre longitudinal directions(z).In conjunction with formula (1)~(4), the fiber core radius a and fiber lengths of energy-transmission optic fibre, energy are selected
Enough so that the pumping laser of high power optical fibre laser system output to be measured and the output of tunable wave length ultra-low noise optical fiber laser
Signal laser being capable of effective Raman amplifiction and Raman conversion in energy-transmission optic fibre.
If the fiber lengths of energy-transmission optic fibre are L, then z=L, P are enableds(L) it is to pass through Raman amplifiction rear center wavelength for λ2's
The output power of laser.Therefore, Raman conversion effect when high power optical fibre laser system to be measured ideally rises and falls without time domain
Rate ηs1It is represented by:
(6) it by the device for evaluating high power optical fibre laser system time-domain stability, is obtained using power meter measurement
Centre wavelength is λ under actual conditions2Raman amplifiction laser output power Pse(L), and then actual Raman light is calculated
Transfer efficiency (ηs2);ηs2Specific formula for calculation it is as follows:
(7) it is λ by the centre wavelength actually measured in step (6)2Raman amplifiction laser power Pse(L) and step
(5) what is be calculated in rises and falls ideally Raman amplifiction laser power power P without time domains(L) ratio operation is done, if the ratio
Value is R1;Actual Raman light efficiency eta will be calculated in step (6)s2It is risen without time domain with being calculated in step (5)
The Raman light efficiency eta of volt ideallys2Ratio operation is done, if ratio is R2;Use R1Or R2Directly evaluate high power to be measured
The time-domain stability of fiber laser system.
The present invention can both use R1The time-domain stability for directly evaluating high power optical fibre laser system to be measured, can also use R2
Directly evaluate the time-domain stability of high power optical fibre laser system to be measured.Specifically, ratio R1It is bigger, high-power fiber to be measured
The time-domain stability of laser system is poorer;Likewise, ratio R2It is bigger, the time-domain stability of high power optical fibre laser system to be measured
It is poorer.
Heretofore described high power optical fibre laser system type to be measured is unlimited, output laser center wavelength is unlimited, can
Be output wavelength covering ytterbium ion emission spectra wave band (1um wave bands) mix ytterbium high power optical fibre laser system, output wavelength is covered
Er-doped high power optical fibre laser system, the output wavelength of lid erbium ion emission spectra wave band (1.55um wave bands) cover thulium/holmium ion
Emission spectra wave band (2um wave bands) mixes thulium/holmium high power optical fibre laser system, can also be that output wavelength covers other and special mixes
The high power optical fibre laser system of heteroion emission spectra wave band;High power optical fibre laser system implementations to be measured are unlimited, can be with
It is direct high-power oscillator, high power super-fluorescence light source, the random fiber laser system of high power or is put based on main oscillations power
The high power optical fibre laser system that big structure is realized;High power optical fibre laser system line width to be measured is unlimited, can be single-frequency, narrow line
Wide or general wide range high power optical fibre laser system.
Heretofore described tunable wave length ultra-low noise optical fiber laser is generally single frequency optical fiber laser or to list
Frequency optical fiber laser applies the narrow cable and wide optical fiber laser that phase-modulation generates.The realization method of single frequency optical fiber laser is unlimited,
Can be distributed feedback laser, Distributed Bragg Reflection laser, non-planar ring oscillator, single-frequency optical fibre ring swash
Light device can also be the laser light source that single-frequency semiconductor laser passes through fiber coupling output.Tunable wave length super-low noise acousto-optic
Fibre laser wavelength tuning range is determined by the launch wavelength of high power optical fibre laser system to be measured.If high-power fiber to be measured swashs
The centre wavelength that photosystem exports laser is λ1, its corresponding Raman Stokes shift amount of energy-transmission optic fibre is Δ λR, then λ2=λ1
+ΔλRWithin the scope of tunable ultra-low noise optical fiber laser output wavelength.
Heretofore described wavelength division multiplexer realization method is unlimited, can be that the diaphragm film coated type wavelength-division of fiber coupling is multiple
Relationship type wavelength division multiplexer etc. is dissipated with device, fused biconical taper formula wavelength division multiplexer, prismatic colours.Wavelength division multiplexer effect is by height to be measured
The centre wavelength of fiber optic power laser system output is λ1Laser and tunable wave length ultra-low noise optical fiber laser output
Centre wavelength is λ2Laser synthesizing be beam of laser output.
Heretofore described energy-transmission optic fibre host material composition is unlimited, can be quartz, phosphate, silicate, vulcanization
Object etc.;Energy-transmission optic fibre core size, length are unlimited, with specific reference to the output power and wavelength of high power optical fibre laser system to be measured
The size of tunable ultra-low noise optical fiber laser injecting power is determined according to formula (1)~formula (4).Energy-transmission optic fibre fibre core ruler
Very little and length combination meets effective non-linear Raman conversion.
Heretofore described collimator realizes the collimation transmitting of output laser, can be by one or more lens combinations
It realizes;The material selection of lens is various, can be fused quartz, ZnSe, CaF2Deng.
Raman amplifiction rear center wavelength is λ by heretofore described bandpass filter1Laser and remaining wavelength be λ2
Laser from two beams are spatially divided into, generally realized by multicoating filter sheet structure.
Heretofore described power meter is λ for receiving Raman amplifiction rear center wavelength1Laser, and to its output work
Rate measures display.
Heretofore described useless light collector is λ for receiving remaining wavelength after Raman amplifiction2Laser, can
Can also be useless light collector of taper etc. to be power meter.
Compared with prior art, the present invention can generate following technique effect:
1, the present invention provides one kind evaluating high power optical fibre laser system time-domain stability based on pure optical detecting method
Device.The laser of high power optical fibre laser system output to be measured serves as pumping laser, tunable super-low noise acousto-optic in the device
The laser of fibre laser output serves as signal light seed laser, and energy-transmission optic fibre provides Raman gain, is believed to Raman amplifiction by preceding
Dependence number between optical output power and transfer efficiency and pump light time-domain stability, by simply measuring Raman amplifiction letter
The output power of number light, and then Raman-amplifying signal light conversion efficiency is calculated, and rise and fall ideally with no time domain
Raman-amplifying signal optical output power and transfer efficiency compare, you can the time domain for evaluating high power optical fibre laser system to be measured is steady
It is qualitative.Compared with Traditional photovoltaic detection method, the device avoids the deficiencies of photodetection and processing module Bandwidth-Constrained, have
The peculiar advantages such as responsive bandwidth height, fast response time can be used for evaluating the different time scales such as nanosecond and following, microsecond, millisecond
Time-domain stability characteristic;
2, provided by the invention a kind of based on pure optical detecting method evaluation high power optical fibre laser system time-domain stability
Device have versatility:If the central wavelength lambda of high power optical fibre laser system output laser to be measured1If energy-transmission optic fibre matrix
Material determines (i.e. raman gain medium determination, Raman Stokes shift amount Δ λRDetermine), by adjusting tunable super-low noise
Acousto-optic fibre laser exports the central wavelength lambda of laser2, it is made to meet λ2=λ1+ΔλR, which can realize arbitrary wavelength
The evaluation of high power optical fibre laser system time-domain stability;Increased by rationally designing Injection Signal light seed power and providing Raman
Fibre core covering ratio, length and the matrix type of the energy-transmission optic fibre of benefit, the invention device can be used for arbitrary power level high power light
The evaluation of fiber laser system time-domain stability.
3, provided by the invention a kind of based on pure optical detecting method evaluation high power optical fibre laser system time-domain stability
Device in, high power optical fibre laser system type to be measured is unlimited, output laser center wavelength is unlimited, can be that output wavelength is covered
Lid ytterbium ion emission spectra wave band (1um wave bands) mixes ytterbium high power optical fibre laser system, output wavelength covering erbium ion emission spectra
Er-doped high power optical fibre laser system, the output wavelength of wave band (1.55um wave bands) cover thulium/holmium ion emission spectra wave band (2um
Wave band) mix thulium/holmium high power optical fibre laser system, can also be that output wavelength covers other special Doped ions emission spectra waves
The high power optical fibre laser system of section;High power optical fibre laser system implementations to be measured are unlimited, can be that direct high power shakes
Swing device, high power super-fluorescence light source, the random fiber laser system of high power or the height realized based on master oscillation power amplification structure
Fiber optic power laser system;High power optical fibre laser system line width to be measured is unlimited, can be that single-frequency, narrow linewidth or general wide range are high
Fiber optic power laser system.
4, provided by the invention a kind of based on pure optical detecting method evaluation high power optical fibre laser system time-domain stability
Device in, tunable wave length ultra-low noise optical fiber laser is generally single frequency optical fiber laser or single frequency optical fiber laser and applies
The narrow cable and wide optical fiber laser that phase-modulation generates.The realization method of single frequency optical fiber laser is unlimited, can be distributed Feedback
Laser, Distributed Bragg Reflection laser, non-planar ring oscillator, single-frequency annular optical fiber laser, can also be list
Frequency semiconductor laser passes through the laser light source of fiber coupling output;
5, provided by the invention a kind of based on pure optical detecting method evaluation high power optical fibre laser system time-domain stability
Device in, wavelength division multiplexer realization method is unlimited, can be diaphragm film coated type wavelength division multiplexer, the fused biconical taper of fiber coupling
Formula wavelength division multiplexer, prismatic colours dissipate relationship type wavelength division multiplexer etc.;Energy-transmission optic fibre host material constitute it is unlimited, can be quartz,
Phosphate, silicate, sulfide etc.;The material selection of collimator lens is various, can be fused quartz, ZnSe, CaF2Deng.
Description of the drawings
Fig. 1 is the structural diagram of the present invention;
In figure:High power optical fibre laser system 1 to be measured, tunable wave length ultra-low noise optical fiber laser 2, wavelength division multiplexer
3, energy-transmission optic fibre 4, collimator 5, bandpass filter 6, power meter 7, useless light collector 8;
Fig. 2 is distribution map of the high power optical fibre laser system time domain light intensity to be measured in microsecond scale;
Fig. 3 is variation diagram of the 1120nm Raman amplifictions laser output power with pump power.
Specific implementation mode
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Referring to Fig.1, the device for evaluating high power optical fibre laser system time-domain stability, including high-power fiber to be measured
Laser system 1, tunable wave length ultra-low noise optical fiber laser 2, wavelength division multiplexer 3, energy-transmission optic fibre 4, collimator 5, band logical filter
Wave device 6, power meter 7, useless light collector 8.
Its output laser center wavelength of the high power optical fibre laser system 1 to be measured is λ1, the tunable wave length is ultralow
Its output laser center wavelength of noise fibre lasers 2 is λ2, its corresponding Raman Stokes shift amount of energy-transmission optic fibre 4 is Δ
λR, wherein its output laser center wavelength of tunable wave length ultra-low noise optical fiber laser 2 λ2=λ1+ΔλR;
The laser that the high power optical fibre laser system 1 to be measured and tunable wave length ultra-low noise optical fiber laser 2 export
Beam of laser output is synthesized by wavelength division multiplexer 3, the laser beam after beam is closed and is injected into energy-transmission optic fibre 4.High power to be measured
The laser that fiber laser system 1 exports serves as pumping laser, and the laser that tunable ultra-low noise optical fiber laser 2 exports serves as letter
Number laser, energy-transmission optic fibre 4 provide Raman gain, in this way the Raman fiber laser amplifier structure of one forward pumping of composition.
The laser beam collimator 5 exported through energy-transmission optic fibre 4 collimates output, and the laser beam exported from collimator 5 passes through band
It is λ that respectively centre wavelength is divided into two bundles after bandpass filter 62Raman amplifiction laser and remaining centre wavelength be λ1Laser,
Wherein centre wavelength is λ2Raman amplifiction laser be injected into power meter 7, remaining centre wavelength is λ1Laser be injected into useless light
Collector 8.
High-power fiber is evaluated based on the device shown in FIG. 1 for evaluating high power optical fibre laser system time-domain stability
The method of laser system time-domain stability, includes the following steps:
(1) power and central wavelength lambda of high power optical fibre laser system output laser to be measured are measured1。
(2) determine the energy-transmission optic fibre used in device for evaluating high power optical fibre laser system time-domain stability and
Raman Stokes shift amount Δ λ corresponding to its host material of its energy-transmission optic fibreR。
(3) central wavelength lambda of tunable wave length ultra-low noise optical fiber laser output laser is determined2, λ2=λ1+ΔλR。
(4) output power of tunable wave length ultra-low noise optical fiber laser output laser is measured.
(5) it determines the core size and length of energy-transmission optic fibre, and calculates and rise and fall ideally Raman amplifiction without time domain
Laser power and Raman light conversion efficiency;
The Raman amplifiction process comprising pumping laser time domain specification is logical in the Raman fiber laser amplifier structure of forward pumping
It is described to coupled amplitude equation before crossing, as described below:
Wherein:EpAnd EsRespectively represent the light field of pumping laser and signal laser, νgpAnd νgsRespectively represent pumping laser and
The group velocity of signal laser, β2pAnd β2sRespectively represent the group velocity dispersion coefficient of pumping laser and signal laser, αpAnd αsRespectively
Represent the loss factor of pumping laser and signal laser, δRFor variations in refractive index caused by Raman, fRIt is to postpone Raman response to non-
The decimal contribution (referred to as " contribution of decimal Raman ") linearly planned, gpAnd gsThe Raman of pumping laser and signal laser is indicated respectively
Gain coefficient;γpAnd γsThe Kerr coefficient (nonlinear factor) for respectively representing pumping laser and signal laser, is expressed as:
Wherein, n2For nonlinear refractive index, AeffFor the effective core area of energy-transmission optic fibre;AeffWith energy-transmission optic fibre fibre core half
Dependence between diameter a is expressed as:
Aeff=Γ π a2 (3)
Wherein, Γ is relative scale coefficient, and value range is generally 0.8~1.
The light field E of pumping laser and signal laserpAnd EsMeet between pump laser power and signal laser power:
Wherein:dσFor along the effective core area A of energy-transmission optic fibreeffIntegral.
If Injection Signal laser (laser of i.e. tunable ultra-low noise optical fiber laser output) power is Ps(0), it injects
Pumping laser (laser of high power optical fibre laser system output i.e. to be measured) power be PpIt (0), can using formula (1)-(4)
Be calculated high power optical fibre laser system to be measured without time domain rise and fall ideally Raman amplifiction laser power along energy-transmission optic fibre
The distribution P of longitudinal (i.e. energy-transmission optic fibre length direction)s(z).In conjunction with formula (1)~(4), the fiber core radius a of energy-transmission optic fibre is selected
And fiber lengths, enable to the pumping laser and tunable wave length super-low noise acousto-optic of high power optical fibre laser system output to be measured
The signal laser of fibre laser output being capable of effective Raman amplifiction and Raman conversion in energy-transmission optic fibre.
If the fiber lengths of energy-transmission optic fibre are L, then z=L, P are enableds(L) it is to pass through Raman amplifiction rear center wavelength for λ2's
The output power of laser;Therefore, Raman conversion effect when high power optical fibre laser system to be measured ideally rises and falls without time domain
Rate ηs1It is represented by:
(6) it by the device for evaluating high power optical fibre laser system time-domain stability, is obtained using power meter measurement
Centre wavelength is λ under actual conditions2Raman amplifiction laser output power Pse(L), and then actual Raman light is calculated
Efficiency etas2;ηs2Calculation formula it is as follows:
(7) will actually be measured in step (6) and obtain centre wavelength is λ2Raman amplifiction laser power Pse(L) and step
(5) what is be calculated in rises and falls ideally Raman amplifiction laser power power P without time domains(L) ratio operation is done, if the ratio
Value is R1;
Actual Raman light efficiency eta will be calculated in step (6)s2Be calculated in step (5) without time domain
The Raman light efficiency eta to rise and fall ideallys2Ratio operation is done, if ratio is R2。
Use R1Or use R2The time-domain stability of high power optical fibre laser system to be measured is directly evaluated, it is specific as follows:
Use R1Directly evaluate the time-domain stability of high power optical fibre laser system to be measured, ratio R1It is bigger, high power light to be measured
The time-domain stability of fiber laser system is poorer;Or use R2Directly evaluate the time-domain stability of high power optical fibre laser system to be measured
Property, ratio R2Bigger, the time-domain stability of high power optical fibre laser system to be measured is poorer.
The validity theory analysis that the method for the present invention is provided below is as follows:
If high power optical fibre laser system light intensity to be measured changes with time as follows:
I (t)=s |f(t)+σ| (7)
Wherein:F (t) meets standardized normal distribution, and σ is the characteristic parameter of noise in time domain power.
Without loss of generality, if the central wavelength lambda of high power optical fibre laser system output laser to be measured1=1070nm, Raman
Gain media, that is, energy-transmission optic fibre selects fibre core covering than the silicon base medium optical fiber for 6/125 μm, 1070nm wave bands its Ramans this
Stokes shift amount Δ λRAbout 50nm, then the centre wavelength of tunable ultra-low noise optical fiber laser output laser be set as λ2
=1120nm.Ignore variations in refractive index δ caused by RamanR, other parameters typical value is as follows in formula (1):νgp=νgs=2 ×
108m/s,β2p=β2s=20ps2/km,αp=αs=0.015dB/m, fR=0.245, gp=4.4W-1/km,gs=4.2W-1/ km,
The influence for ignoring wavelength enables γp=γs=10W-1/km。
If σ is respectively 0,1.5,2, high power optical fibre laser system time domain light intensity to be measured can be calculated micro- by formula (3)
The second distribution of scale is as shown in Figure 2.In Fig. 2, abscissa is the time (Time/us), ordinate is normalized intensity
(Normalized intensity/a.u.).It can be obtained by Fig. 2, with the increase of noise in time domain power characteristic parameter σ, height to be measured
Fiber optic power laser system time domain tends to be more stable.
Fig. 3 is device according to the present invention, uses time-domain stability different (as shown in Figure 1), centre wavelength 1070nm, most
The high power optical fibre laser system output laser to be measured of big average output power~50W as pump light, output power 40mW,
Centre wavelength is that 1120nm ultra-low noises optical fiber laser is used as signal light seed, and it is 6/125 μm to pump 80 meters of fibre core covering ratios
Energy-transmission optic fibre, in conjunction with formula (1)~(4) analysis gained 1120nm Raman amplifictions optical output power (Output power/W) with
The variation of pump power (Pump power/W).It can be obtained by Fig. 3, pumping laser time domain is more stable, is converted when reaching effective Raman
After threshold value, the output power of Raman light is lower under identical pump power, i.e. Raman transfer efficiency is lower.On the contrary, as pumping swashs
Optical time domain stability degradation, the output power of Raman light is higher under identical pump power, i.e. Raman transfer efficiency is higher.It is above-mentioned existing
The physical interpretation of elephant is as follows:In the invention device, the effective g-factor of Raman amplifiction can be unstable with pumping laser time domain
Qualitatively increase and constantly becomes strong.Pumping laser time domain is more unstable, and corresponding high frequency section noise is stronger, and effective Raman increases
Benefit is higher, and then causes the output power of Raman amplifiction light higher, and Raman transfer efficiency is also higher.In turn, by with no time domain
The Raman amplifiction optical output power being ideally calculated that rises and falls and transfer efficiency compare, you can when evaluation is above-mentioned different
Domain, which rises and falls, is distributed the time-domain stability of high power optical fibre laser system to be measured.
Above-mentioned analysis result effectively demonstrates the invention device for evaluating high power optical fibre laser system time-domain stability
Feasibility.It should be noted that:Although (i) above-mentioned analytic process assumes λ1=1070nm, λ2=1120nm, once height to be measured
The central wavelength lambda of fiber optic power laser system output laser1It determines, raman gain medium determines (i.e. Raman Stokes shift
Measure Δ λRDetermine), the central wavelength lambda of laser is exported by adjusting tunable ultra-low noise optical fiber laser2, it is made to meet λ2=
λ1+ΔλR, which can realize the evaluation of arbitrary wavelength high power optical fibre laser system time-domain stability;(ii) although on
It states analysis and assumes high power optical fibre laser system maximum average output power~50W to be measured, according to formula (1)~(4), pass through conjunction
Fiber core radius, length and the matrix type of the energy-transmission optic fibre of reason design Injection Signal light seed power and offer Raman gain, make
Effective Raman conversion can be realized by obtaining pump light, and it is steady that this method can be used for arbitrary power level high power optical fibre laser system time domain
Qualitatively evaluation.
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, any made by
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. the device for evaluating high power optical fibre laser system time-domain stability, it is characterised in that:Including high power light to be measured
Fiber laser system, tunable wave length ultra-low noise optical fiber laser, wavelength division multiplexer, energy-transmission optic fibre, collimator, bandpass filtering
Device, power meter, useless light collector;
Its output laser center wavelength of the high power optical fibre laser system to be measured is λ1, the tunable wave length super-low noise acousto-optic
Its output laser center wavelength of fibre laser is λ2, the Raman Stokes shift amount corresponding to its host material of energy-transmission optic fibre is
ΔλR, wherein its output laser center wavelength of tunable wave length ultra-low noise optical fiber laser λ2=λ1+ΔλR;
The high power optical fibre laser system to be measured and the laser of tunable wave length ultra-low noise optical fiber laser output pass through wave
Division multiplexer synthesizes beam of laser output, closes the laser beam after beam and is injected into energy-transmission optic fibre, through swashing for energy-transmission optic fibre output
Light beam collimator collimation output, from collimator export laser beam by be divided into two bundles after bandpass filter difference centered on wave
A length of λ2Raman amplifiction laser and remaining centre wavelength be λ1Laser, wherein centre wavelength be λ2Raman amplifiction laser
It is injected into power meter, remaining centre wavelength is λ1Laser be injected into useless light collector.
2. the device according to claim 1 for evaluating high power optical fibre laser system time-domain stability, feature exists
In:The laser of high power optical fibre laser system output to be measured serves as pumping laser, tunable ultra-low noise optical fiber laser output
Laser serve as signal laser, energy-transmission optic fibre provides Raman gain, and the Raman fiber laser of one forward pumping of composition in this way is put
Big structure.
3. the device according to claim 1 for evaluating high power optical fibre laser system time-domain stability, feature exists
In:High power optical fibre laser system to be measured is that output wavelength covering ytterbium ion emission spectra wave band mixes ytterbium high power optical fibre laser system
System, the er-doped high power optical fibre laser system of output wavelength covering erbium ion emission spectra wave band, output wavelength covering thulium/holmium ion
Emission spectra wave band mix thulium/holmium high power optical fibre laser system or output wavelength covers other Doped ions emission spectra waves
The high power optical fibre laser system of section;
High power optical fibre laser system to be measured is direct high-power oscillator, high power super-fluorescence light source, the random optical fiber of high power
Laser system or the high power optical fibre laser system realized based on master oscillation power amplification structure;
High power optical fibre laser system to be measured is single-frequency, narrow linewidth or wide range high power optical fibre laser system.
4. the device according to claim 1 for evaluating high power optical fibre laser system time-domain stability, feature exists
In:Tunable wave length ultra-low noise optical fiber laser is single frequency optical fiber laser or applies phase-modulation to single frequency optical fiber laser
The narrow cable and wide optical fiber laser of generation, wherein single frequency optical fiber laser are distributed feedback laser, Distributed Bragg Reflection
Laser, non-planar ring oscillator, single-frequency annular optical fiber laser or single-frequency semiconductor laser pass through fiber coupling
The laser light source of output;
Tunable wave length ultra-low noise optical fiber laser wavelength tuning range by high power optical fibre laser system to be measured transmitted wave
It is long to determine;If the centre wavelength of high power optical fibre laser system output laser to be measured is λ1, energy-transmission optic fibre its corresponding Raman this
Stokes shift amount is Δ λR, then λ2=λ1+ΔλRWithin the scope of tunable ultra-low noise optical fiber laser output wavelength i.e.
It can.
5. the device according to claim 1 for evaluating high power optical fibre laser system time-domain stability, feature exists
In:Wavelength division multiplexer is diaphragm film coated type wavelength division multiplexer, fused biconical taper formula wavelength division multiplexer or the prism dispersion of fiber coupling
Relationship type wavelength division multiplexer.
6. the device according to claim 1 for evaluating high power optical fibre laser system time-domain stability, feature exists
In:Its host material of energy-transmission optic fibre is quartz, phosphate, silicate or sulfide.
7. the device according to claim 1 for evaluating high power optical fibre laser system time-domain stability, feature exists
In:Collimator is formed by one or more lens combinations, and the material of wherein lens is fused quartz, ZnSe or CaF2。
8. the device according to claim 1 for evaluating high power optical fibre laser system time-domain stability, feature exists
In:Bandpass filter is realized by multicoating filter sheet structure.
9. being commented based on the device for evaluating high power optical fibre laser system time-domain stability described in any of the above-described claim
The method of valence high power optical fibre laser system time-domain stability, it is characterised in that:Include the following steps:
(1) power and central wavelength lambda of high power optical fibre laser system output laser to be measured are measured1;
(2) energy-transmission optic fibre used in the device for evaluating high power optical fibre laser system time-domain stability and its biography are determined
Raman Stokes shift amount Δ λ corresponding to its host material of energy optical fiberR;
(3) central wavelength lambda of tunable wave length ultra-low noise optical fiber laser output laser is determined2, λ2=λ1+ΔλR;
(4) output power of tunable wave length ultra-low noise optical fiber laser output laser is measured;
(5) it determines the core size and length of energy-transmission optic fibre, and calculates and rise and fall ideally Raman amplifiction laser without time domain
Power and Raman light conversion efficiency;
Before the Raman amplifiction process comprising pumping laser time domain specification passes through in the Raman fiber laser amplifier structure of forward pumping
It is described to coupled amplitude equation, as described below:
Wherein:EpAnd EsRespectively represent the light field of pumping laser and signal laser, νgpAnd νgsRespectively represent pumping laser and signal
The group velocity of laser, β2pAnd β2sRespectively represent the group velocity dispersion coefficient of pumping laser and signal laser, αpAnd αsIt respectively represents
The loss factor of pumping laser and signal laser, δRFor variations in refractive index caused by Raman, fRIt is to postpone Raman response to non-linear
The decimal of plan is contributed, gpAnd gsThe Raman gain coefficienct of pumping laser and signal laser is indicated respectively;γpAnd γsIt respectively represents
The Kerr coefficient of pumping laser and signal laser, is expressed as:
Wherein, n2For nonlinear refractive index, AeffFor the effective core area of energy-transmission optic fibre;AeffWith energy-transmission optic fibre fiber core radius a it
Between dependence be expressed as:
Aeff=Γ π a2 (3)
Wherein, Γ is relative scale coefficient;
The light field E of pumping laser and signal laserpAnd EsMeet between pump laser power and signal laser power:
Wherein:Z is along the distance parameter of the length direction of energy-transmission optic fibre, z [0, L], energy-transmission optic fibre is indicated as z=0
Input terminal indicates the output end of energy-transmission optic fibre when z=L;dσFor along the effective core area A of energy-transmission optic fibreeffIntegral;
If Injection Signal laser power is Ps(0), the pump laser power of injection is Pp(0), it using formula (1)-(4), can calculate
Obtain high power optical fibre laser system to be measured without time domain rise and fall ideally Raman amplifiction laser power along energy-transmission optic fibre length
The distribution P in directions(z);In conjunction with formula (1)~(4), the fiber core radius a and fiber lengths of energy-transmission optic fibre are selected, enables to wait for
The signal of the pumping laser and the output of tunable wave length ultra-low noise optical fiber laser of surveying high power optical fibre laser system output swashs
Light being capable of effective Raman amplifiction and Raman conversion in energy-transmission optic fibre;
If the fiber lengths of energy-transmission optic fibre are L, then z=L, P are enableds(L) it is to pass through Raman amplifiction rear center wavelength for λ2Laser
Output power;Therefore, Raman efficiency eta when high power optical fibre laser system to be measured ideally rises and falls without time domains1
It is expressed as:
(6) by the device for evaluating high power optical fibre laser system time-domain stability, reality is obtained using power meter measurement
In the case of centre wavelength be λ2Raman amplifiction laser output power Pse(L), and then actual Raman light conversion is calculated
Efficiency etas2;ηs2Calculation formula it is as follows:
(7) will actually be measured in step (6) and obtain centre wavelength is λ2Raman amplifiction laser power Pse(L) and in step (5)
What is be calculated rises and falls ideally Raman amplifiction laser power power P without time domains(L) ratio operation is done, if the ratio is
R1;
Actual Raman light efficiency eta will be calculated in step (6)s2It rises and falls without time domain with being calculated in step (5)
Raman light efficiency eta ideallys2Ratio operation is done, if ratio is R2;
Use R1Directly evaluate the time-domain stability of high power optical fibre laser system to be measured, ratio R1Bigger, high-power fiber to be measured swashs
The time-domain stability of photosystem is poorer;Or use R2The time-domain stability for directly evaluating high power optical fibre laser system to be measured, than
Value R2Bigger, the time-domain stability of high power optical fibre laser system to be measured is poorer.
10. the method for evaluation high power optical fibre laser system time-domain stability according to claim 9, it is characterised in that:
Γ value ranges are 0.8~1 in formula (3).
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