CN110277725A - Supercontinuum generation method and device with spectral distribution not changing with power - Google Patents
Supercontinuum generation method and device with spectral distribution not changing with power Download PDFInfo
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- CN110277725A CN110277725A CN201910640456.7A CN201910640456A CN110277725A CN 110277725 A CN110277725 A CN 110277725A CN 201910640456 A CN201910640456 A CN 201910640456A CN 110277725 A CN110277725 A CN 110277725A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
- H01S3/1024—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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Abstract
The invention relates to a supercontinuum generation device, in particular to a supercontinuum generation method and a supercontinuum generation device, wherein the spectrum distribution of the supercontinuum generation device does not change along with power. The device comprises a DSR laser, a fiber amplifier, a first pump light source, a coupler, a second pump light source and a third pump light source; the invention can obtain the optical pulse with constant peak power and unchanged with the change of the pumping power, and the needed peak power can be adjusted by changing the parameters of the devices in the structure; secondly, a super-continuum spectrum with spectral distribution not changing with output power can be obtained, and stability, practicability and reliability in the application process are improved; thirdly, the structure is simple, the operation is easy, the optical pulse with constant peak power and unchanged pumping power and the super-continuum spectrum with spectrum distribution and unchanged output power can be realized through proper pumping power distribution, redundant links are not involved, and the energy utilization rate is high.
Description
Technical field
The present invention relates to a kind of supercontinuum generation devices, and in particular to a kind of super company that spatial distribution does not change with power
Continuous spectrum production method and device.
Background technique
Super continuum source has many advantages, such as that spectral width, brightness are high and spatial coherence is good simultaneously, in optical measurement, molecule
Spectroscopy, biomedical imaging and optical bio tissue ablation etc. have a wide range of applications, and are grinding for light source field
Study carefully one of hot spot.Currently, super continuous spectrums are mainly by being input to nonlinear dielectric (such as photonic crystal fiber) for pulse laser
The middle mode for carrying out non-linear broadening obtains, and surpasses and connects after the shape and wavelength of pumping pulse are fixed in the length of nonlinear dielectric
The spatial distribution of continuous spectrum is mainly determined by the peak power for pumping its pulse laser.Swash since pump power will affect pulse
The peak power of light device, the variation of pulse laser peak power cause output spectrum and the output power variation of super continuous spectrums,
So the spatial distribution of the super continuous spectrums finally excited can change with the variation of its output power.Therefore, how light is obtained
Spectral structure not is the technical issues of this field researcher extremely pays close attention to the super continuous spectrums that output power changes, and fundamental way is
Obtain the pulse laser that a peak power does not change with pump power.
Dissipative solitons resonance mode locking (Dissipative Soliton Resonance, DSR) pulse is that one kind can produce
The mode locking pulse of very big energy predicted occur by theoretical calculation in 2008, is confirmed in experiment within 2009.Theoretical and experiment table
Bright, under dissipative solitons resonance state, with the raising of pump power, pulse can be broadened greatly, but maintain peak power not
Become.But existing DSR laser has the disadvantage in that now in the application that direct pumped nonlinear medium generates super continuous spectrums
Some DSR laser powers up to multikilowatt needs to carry out power amplification to thousands of watts by single-stage or casacade multi-amplifier
Magnitude, just can be used as the pumping source of super continuum source, but directly amplifies the pulse obtained after DSR laser and lose peak
It is worth the characteristic that power does not change with pump power.
And the present invention can effectively make up the shortcomings that above-mentioned DSR laser directly amplifies, and generate a peak power not
With the optical fiber laser that pump power changes, while obtaining the super continuous spectrums that spatial distribution does not change with output power.
Summary of the invention
For the shortcoming for directly amplifying DSR laser, the present invention proposes what a kind of spatial distribution did not changed with power
Supercontinuum generation method and device, technical problems to be solved are by distribution DSR laser pumping power and amplifier pump
Peak power amplification several times even several magnitudes of DSR pulse are obtained output pulse peak power not with pumping function by Pu power
The optical fiber laser that rate changes obtains the super continuous spectrums that spatial distribution does not change with output power.
The technical scheme adopted by the invention is as follows: a kind of supercontinuum generation method that spatial distribution does not change with power,
It is pumped for comprising DSR laser 1, fiber amplifier 2, the first pump light source 3, coupler 4, the second pump light source 5 and third
The supercontinuum generation device of light source 6, comprising the following steps:
The first step acquires 1 parameter of DSR laser, calculates 1 pump power of DSR laser and output pulse width relationship:
The one group of pump power and corresponding pulse width data of DSR laser 1: X0, X1 are measured ..., Xn and τ0,
τ1,…,τn, wherein X0 is that (DSR laser needs certain pump power that can just open for the threshold value of pulse starting of oscillation in DSR laser 1
Begin to export pulse, which is the threshold value of DSR laser pulse starting of oscillation), τ0Output pulse width when for starting of oscillation；Knot
The data for closing DSR laser 1 pump power and pulse width calculate DSR laser 1 according to the method for linear fit and pump function
The slope k of rate and pulse width；
Second step acquires 2 parameter of fiber amplifier, calculates 2 pump power of fiber amplifier and output pulse peak power is closed
System:
Any pump power for adjusting DSR laser 1 is the X1 and X2 greater than threshold X 0, respectively corresponds the arteries and veins of output pulse
Rushing width is τ1And τ2；Fixed 1 output pulse width of DSR laser is in τ1And τ2When, fiber amplifier 2 is measured respectively to be pumped
Power data and amplified pulse peak power data, according to linear fitting calculate 2 pump power of fiber amplifier and
The slope of amplified pulse peak power relationship；It is inversely proportional according to the slope with pulse width, with pulse period and optical fiber
Pulse width is τ by the directly proportional relationship of 2 amplification efficiency of amplifier1And τ2Under slope express respectively are as follows:Its
Middle η represents the amplification efficiency of fiber amplifier 2, and T is the period of pulse；
According to the approximate regulation that pulse width in amplification process is constant, the pulse width in amplification process maintains τ1And τ2；Arteries and veins
Rushing width is τ1And τ2When, amplified pulse peak power and 2 pump power relationship of fiber amplifier are as follows:
X0 is the amplification threshold value of fiber amplifier 2 (when fiber amplifier is passed through in pulse, due to the gain in fiber amplifier
For medium there are certain absorption, the pulse of input could be made by needing to set the pump power of fiber amplifier to certain numerical value
Peak power, which is not amplified just, also not to be reduced, and pump power is higher than the numerical value afterpulse peak power and just starts to be amplified, should
Pump power is the amplification threshold value of fiber amplifier), PinThe peak power of pulse, P are exported for DSR laser 11And P2Respectively
Expression pulse width is τ1And τ2Pulse amplifying after peak power, when η Tx represents pump light source and acts on fiber amplifier 2
To the function that pulse is done, pulse-width τ1And τ2Pulse caused by pulse peak power variable quantity be proportional toWith
Third step calculates coupling ratio:
Peak power variable quantity of the pulse that DSR laser 1 exports after fiber amplifier 2 is (Pout-Pin), PoutFor
Required obtained peak power；It is τ in pulse width1And τ2When, the pump power variable quantity of fiber amplifier 2 are as follows:
1 output pulse width of DSR laser is from τ1Increase to τ2When, the pump power variable quantity of DSR laser 1 are as follows:
The coupling ratio of coupler 4 is the ratio between DSR laser 1 and the variable quantity of pump power of fiber amplifier 2:
4th step generates super continuous spectrums:
X0 is set by the pump power of the first pump light source 3, the pump power of the second pump light source 5 is set as x0, choosing
The coupling ratio for taking coupler 4 isAdjusting third pump light source 6 can be realized in proportion to DSR laser 1 and light
Fiber amplifier 2 energizes, and generates with realizing the super continuous spectrums that spatial distribution does not change with power.
Further, the method for linear fit is first-order linear fitting process in the first step and second step.
The present invention also provides a kind of supercontinuum generation device based on above method, including DSR laser 1, optical fiber are put
Big device 2, the first pump light source 3, coupler 4, the second pump light source 5 and third pump light source 6；The output end of DSR laser 1 connects
Connect fiber amplifier 2, the output end of the first pump light source 3 connects DSR laser 1, and by the pump power of the first pump light source 3
It is set as the starting of oscillation threshold value of DSR laser 1, the output end of the second pump light source 5 connects fiber amplifier 2, and second is pumped
The pump power of light source 5 is set as the amplification threshold value of fiber amplifier 2, and coupler 4 is one-to-two coupler, third pump light source
The input terminal of 6 output end connection coupler 4, two output ends of coupler 4 are separately connected DSR laser 1 and fiber amplifier
Device 2；The pumping light power of third pump light source 6 is distributed to by the coupling ratio of the coupler 4 calculated by the above process
DSR laser 1 and fiber amplifier 2 can generate spatial distribution and not export with the super continuous spectrums that power changes.
The present invention also provides the second supercontinuum generation device based on above method, including DSR laser 1, optical fiber
Amplifier 2, the first pump light source 3, coupler 4 and third pump light source 6；The output end of DSR laser 1 connects fiber amplifier
2, the output end of the first pump light source 3 connects DSR laser 1, and the pumping light power of the first pump light source 3 is set as DSR
The starting of oscillation threshold value of laser 1, coupler 4 are one-to-two coupler, and the output end of third pump light source 6 connects the defeated of coupler 4
Enter end, two output ends of coupler 4 are separately connected DSR laser 1 and fiber amplifier 2；By calculating by the above process
The pumping light power of third pump light source 6 is distributed to DSR laser 1 and fiber amplifier 2 by the coupling ratio of the coupler 4 come,
Spatial distribution can be generated not export with the super continuous spectrums that power changes.Fiber amplifier 2 amplification threshold value be much smaller than by than
When example is supplied to the pump light of fiber amplifier 2, the second pump light source 5 is not needed to be additionally provided amplification threshold value, third pumping
The pump light one of light source 6 opens the amplification that fiber amplifier 2 can be made to realize to input pulse peak power.
The present invention also provides the third supercontinuum generation device based on above method, including DSR laser 1, optical fiber
Amplifier 2, coupler 4, the second pump light source 5 and third pump light source 6；The output end of DSR laser 1 connects fiber amplifier
2, the output end of the second pump light source 5 connects fiber amplifier 2, and coupler 4 is one-to-two coupler, third pump light source 6
Output end connects the input terminal of coupler 4, and two output ends of coupler 4 are separately connected DSR laser 1 and fiber amplifier 2；
The pumping light power of third pump light source 6 DSR is distributed to by the coupling ratio of the coupler 4 calculated by the above process to swash
Light device 1 and fiber amplifier 2 can generate spatial distribution and not export with the super continuous spectrums that power changes.In DSR laser 1
When starting of oscillation threshold value is much smaller than the pump light for being supplied to DSR laser 1 in proportion, it has been additionally provided without the first pump light source 3
The unlatching of pump light one of vibration threshold value, third pump light source 6 can make DSR laser 1 start to export pulse.
The present invention also provides the 4th kind of supercontinuum generation devices based on above method, including DSR laser 1, optical fiber
Amplifier 2, coupler 4 and third pump light source 6；The output end of DSR laser 1 connects fiber amplifier 2, and coupler 4 is one
Divide two couplers, the input terminal of the output end connection coupler 4 of third pump light source 6, two output ends of coupler 4 connect respectively
Connect DSR laser 1 and fiber amplifier 2；By the coupling ratio of the coupler 4 calculated by the above process by third pump light
The pumping light power in source 6 distributes to DSR laser 1 and fiber amplifier 2, can generate spatial distribution and not surpass with what power changed
Continuous spectrum output.In the pump that the amplification threshold value of 1 starting of oscillation threshold value of DSR laser and fiber amplifier 2 much smaller than provides in proportion
When the light of Pu, starting of oscillation threshold value and amplification threshold value are additionally provided without the first pump light source 3 and the second pump light source 5, one opens the
Three pump light sources 6 may make DSR laser 1 to export pulse and fiber amplifier 2 to pulse amplifying.
The present invention also provides the 5th kind of supercontinuum generation devices based on above method, including DSR laser 1, optical fiber
Amplifier 2, the first pump light source 3 and the second pump light source 5；The output end of DSR laser 1 connects fiber amplifier 2, the first pump
The output end of Pu light source 3 connects DSR laser 1, and the output end of the second pump light source 5 connects fiber amplifier 2；More than pressing
The pumping light power of first pump light source 3 and the second pump light source 5 is proportionately distributed to by the coupling ratio that method is calculated
DSR laser 1 and fiber amplifier 2 can generate spatial distribution and not export with the super continuous spectrums that power changes.In proper ratio
The unavailable situation of coupler 4 under, DSR is directly pumped by the first pump light source 3 and the second pump light source 5 according to the above ratio
Laser 1 and fiber amplifier 2.
Further, the pulse that the DSR laser 1 can not changed by the peak power of other types with pump power
Light source substitution adjusts laser of the pulse Jing Guo shaping pulse and amplification for example, by using electricity.
Further, the light impulse length range that the DSR laser 1 exports guarantees to put in optical fiber in femtosecond to microsecond
Pulse width is almost unchanged when amplifying in big device 2, and amplified pulse peak power is in line with the pump power of fiber amplifier 2
Property increase.
Further, gain fibre nonlinear effect is weaker in fiber amplifier 2, causes to generate in amplification process
In the case where super continuous spectrums, need to add nonlinear dielectric 8.
Further, the nonlinear dielectric 8 includes the various optical fiber that can produce nonlinear transformation, such as traditional passive light
Fibre, doped fiber, microstructured optical fibers (containing photonic crystal fiber), tapered fiber etc..
Further, nonlinear dielectric 8 exist compared with strong reflection light echo in the case where, need fiber amplifier 2 with it is non-
Isolator 7 is added between linear medium 8.
Further, the connection type of device is connected by tail optical fiber in device.
The present invention is based on following principles: the pumping light power of the peak power and amplifier that export when pulse laser is amplified
It is directly proportional.Under same amplifier pumping optical power, the enlargement ratio of broad pulse is lower than burst pulse.When the arteries and veins of input amplifier
When rushing width increase, by increasing the pump power of amplifier, provide energy to increase the pulse of part, can by broad pulse and
Burst pulse is all amplified to same peak power.The pulse width of input amplifier can pass through the pumping of increase and decrease DSR laser
Power changes.Width by increasing the pulse of input amplifier increases amplifier pump power simultaneously, or reduces input and put
The width of the pulse of big device reduces amplifier pump power simultaneously, and available output peak power is equal but of different size
Pulse.Finally since pulse peak power is constant, the super continuous spectrums spatial distribution generated by nonlinear dielectric is constant, but super
The output power of continuous spectrum increases as pulse energy increases.
Beneficial effects of the present invention are as follows:
First is that the light pulse that constant do not change with pump power of peak power can be obtained and changed, and the peak value needed
Power can be adjusted by changing the parameter (such as coupling ratio of coupler 4) of device in structure；
Second is that the super continuous spectrums that spatial distribution does not change with output power can be obtained, increase the stabilization in its application process
Property practicability reliability；
It is easily operated third is that structure is simple, by the distribution of suitable pump power can be realized peak power it is constant not with
The super continuous spectrums that the light pulse and spatial distribution that pump power changes do not change with output power, are not related to extra link,
Capacity usage ratio is high.
Detailed description of the invention
Fig. 1 is the embodiment of the present invention one, provides pumping using three pumping sources and a coupler；
Fig. 2 is the embodiment of the present invention two, provides pumping using two pumping sources and a coupler；
Fig. 3 is the embodiment of the present invention three, provides pumping using two pumping sources and a coupler；
Fig. 4 is the embodiment of the present invention four, provides pumping using a pumping source and a coupler；
Fig. 5 is the embodiment of the present invention five, provides pumping respectively using two pumping sources；
Fig. 6 is the embodiment of the present invention six, and the additional nonlinear dielectric that increases generates super continuous spectrums, and when needed using isolation
Device avoids reflected light；
Fig. 7 is the principle sketch for explaining the optical fiber laser for realizing that peak power does not change with pump power；(a) DSR swashs
Light device pump power and pulse width corresponding relationship (b) fiber amplifier input pumping light power and output pulse peak power
Corresponding relationship；
Fig. 8 is the increased output pulse schematic diagram of the constant pulse width of peak power of the invention；
Fig. 9 is the output super continuous spectrums schematic diagram that peak power of the invention does not change with pump power.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and detailed description.
Fig. 1 is the embodiment of the present invention one, provides the structure chart of pumping using three pumping sources and a coupler, wherein
DSR laser 1 is connected to fiber amplifier 2 and amplifies.First pump light source 3 connects DSR laser 1, and power setting is
The starting of oscillation threshold value of DSR laser 1, the second pump light source 5 connect fiber amplifier 2, and power setting is putting for fiber amplifier 2
Big threshold value.Third pump light source 6 carries out power distribution by coupler 4, supplies DSR laser 1 and 2 energy of fiber amplifier.
Fig. 2 is the embodiment of the present invention two, provides the structure chart of pumping using two pumping sources and a coupler, wherein
DSR laser 1 is connected to fiber amplifier 2 and amplifies.First pump light source 3 connects DSR laser 1, and power setting is
The starting of oscillation threshold value of DSR laser 1.Third pump light source 6 carries out power distribution by coupler 4, supplies DSR laser 1 and light
2 energy of fiber amplifier.When the amplification threshold value of fiber amplifier 2 is much smaller than the pump light provided in proportion at this time, without the second pump
Pu light source 5.
Fig. 3 is the embodiment of the present invention three, is equally to provide the structure chart of pumping using two pumping sources and a coupler,
Wherein DSR laser 1 is connected to fiber amplifier 2 and amplifies.Second pump light source 5 connects fiber amplifier 2, and power is set
It is set to the amplification threshold value of fiber amplifier 2.Third pump light source 6 carries out power distribution by coupler 4, supplies DSR laser 1
With 2 energy of fiber amplifier.1 starting of oscillation threshold value of DSR laser is much smaller than the pump light provided in proportion at this time, without the first pumping
Light source 3.
Fig. 4 is the embodiment of the present invention four, provides the structure chart of pumping using a pumping source and a coupler, wherein
DSR laser 1 is connected to fiber amplifier 2 and amplifies.The amplification of 1 starting of oscillation threshold value and fiber amplifier 2 of DSR laser at this time
The pump light that threshold value much smaller than provides in proportion is not necessarily to the first pump light source 3 and the second pump light source 5.Third pump light source 6
Power distribution is carried out by coupler 4, supplies DSR laser 1 and 2 energy of fiber amplifier.
Fig. 5 is the embodiment of the present invention five, provides the structure chart of pumping using two pumping sources, wherein DSR laser 1 connects
It is amplified to fiber amplifier 2.4 non-availability of coupler of proper ratio at this time, by the first pump light source 3 and the second pump light
Source 5 is separately connected DSR laser 1 and fiber amplifier 2 and supplies DSR laser 1 and 2 energy of fiber amplifier in calculated ratio
Amount.
Fig. 6 is the embodiment of the present invention six, which increases isolator 7 and non-linear Jie on the basis of example 1
Matter 8；Gain fibre nonlinear effect is weaker in fiber amplifier 2, leads to the feelings that super continuous spectrums cannot be generated in amplification process
Under condition, need to add nonlinear dielectric 8.And it in the case where nonlinear dielectric 8 exists compared with strong reflection light echo, needs in optical fiber
Isolator 7 is added between amplifier 2 and nonlinear dielectric 8.
Fig. 7 is the principle sketch for explaining the optical fiber laser for realizing that peak power does not change with pump power, and Fig. 7 (a) is
The pump power of DSR laser and the corresponding relationship of pulse width, Fig. 7 (b) are pump power and the amplification of fiber amplifier
The corresponding relationship of the peak power of pulse is exported afterwards.Pulse width τ has been marked in Fig. 7 (a)0, τ1And τ2And corresponding DSR pump
Pu power has calculated the relational expression and slope k of width and power.Solid line correspondence is input to fiber amplifier in Fig. 7 (b)
Pulse width in device 2 is τ1, the corresponding pulse width being input in fiber amplifier 2 of dotted line is τ2.Horizontal dotted line indicates vertical
Coordinate position illustrates that the input pulse of different pulse widths at this time is amplified to same peak power, and corresponding abscissa shows
It is respectively x1 and x2 that fiber amplifier 2, which needs pump power values to be offered,.
The method that the super continuous spectrums that peak power does not change with pump power are generated using above-mentioned apparatus is explained by Fig. 7:
The first step acquires 1 parameter of DSR laser, calculates 1 pump power of DSR laser and output pulse width relationship: surveying
The one group of pump power and corresponding pulse width data of DSR laser 1: X0, X1 are measured ..., Xn and τ0,τ1,…,τn；Wherein
X0For the threshold value of pulse starting of oscillation in DSR laser 1, τ0Output pulse width when for starting of oscillation；In conjunction with 1 pump power of DSR laser
Pump power is calculated according to the method that first-order linear is fitted and pulse width is closed in conjunction with Fig. 7 (a) with the data of pulse width
The slope k of system.
Second step acquires 2 parameter of fiber amplifier, calculates 2 pump power of fiber amplifier and output pulse peak power is closed
System: any pump power for adjusting DSR laser 1 is the X1 and X2 greater than threshold X 0, and the pulse for respectively corresponding output pulse is wide
Degree is τ1And τ2(τ1And τ2It is within the scope of 1 output pulse width of DSR laser)；It is wide that fixed DSR laser 1 exports pulse
Degree is in τ1And τ2When, 2 pump power data of fiber amplifier and amplified pulse peak power data are measured respectively, in conjunction with
Fig. 7 (b) calculates 2 pump power of fiber amplifier and amplified pulse peak power relationship according to first-order linear fitting process
Slope.It is inversely proportional in conjunction with the slope with pulse width, the pass directly proportional to pulse period and 2 amplification efficiency of fiber amplifier
Pulse width is τ by system1And τ2Under slope express respectively are as follows:Wherein η represents the amplification effect of fiber amplifier 2
Rate, T are the periods of pulse.
According to the approximate regulation that pulse width in amplification process is constant, the pulse width in amplification process maintains τ1And τ2.Arteries and veins
Rushing width is τ1And τ2When, amplified pulse peak power and 2 pump power relational expression of fiber amplifier are respectively as follows:
X0 is the amplification threshold value of fiber amplifier 2, PinThe peak power of pulse, P are exported for DSR laser 11And P2Respectively
Expression pulse width is τ1And τ2Pulse amplifying after peak power.When η Tx represents pump light source and acts on fiber amplifier 2
To the function that pulse is done, pulse-width τ1And τ2Pulse caused by pulse peak power variable quantity be proportional toWith
Third step calculates coupling ratio: peak power variation of the pulse that DSR laser 1 exports after fiber amplifier 2
Amount is (Pout-Pin), PoutFor required obtained peak power.It is τ in pulse width1And τ2When, the pumping of fiber amplifier 2
Power variation are as follows:
1 output pulse width of DSR laser is from τ1Increase to τ2When, the pump power variable quantity of DSR laser 1 are as follows:
Corresponding coupler coupling ratio is the ratio between DSR laser 1 and the variable quantity of pump power of fiber amplifier 2:
4th step generates super continuous spectrums: X0 is set by the pump power of the first pump light source 3, the second pump light source 5
Pump power is set as x0, and the coupling ratio for choosing coupler 4 isAdjust third pump light source 6 can be realized by
Ratio is energized to DSR laser 1 and fiber amplifier 2, is generated with realizing the super continuous spectrums that spatial distribution does not change with power.
The increased pulse schematic diagram of the constant pulse width of the peak power that Fig. 8 is.According to any in Fig. 1 to Fig. 5
Structure builds system, and the pulse of DSR laser is amplified, and can obtain pulse width and increase still peak power holding not
The output pulse of change.
Fig. 9 is the output super continuous spectrums schematic diagram that finally obtained peak power does not change with pump power.In Fig. 1 to figure
The output end of optical fiber photonic crystal fiber 8 is available with output in the output end and Fig. 6 of fiber amplifier 2 in 5 structures
Power increases, and spectral intensity is integrally promoted but its distribution keeps stablizing constant super continuous spectrums.
Claims (13)
1. a kind of supercontinuum generation method that spatial distribution does not change with power, which is characterized in that this method includes following step
It is rapid:
The first step acquires 1 parameter of DSR laser, calculates 1 pump power of DSR laser and output pulse width relationship:
The one group of pump power and corresponding pulse width data of DSR laser 1: X0, X1 are measured ..., Xn and τ0,τ1,…,
τn, wherein X0 is the threshold value of pulse starting of oscillation in DSR laser 1, τ0Output pulse width when for starting of oscillation；In conjunction with DSR laser 1
The data of pump power and pulse width calculate 1 pump power of DSR laser and pulse width according to the method for linear fit
The slope k of relationship；
Second step acquires 2 parameter of fiber amplifier, calculates 2 pump power of fiber amplifier and output pulse peak power relationship:
Any pump power for adjusting DSR laser 1 is the X1 and X2 greater than threshold X 0, and the pulse for respectively corresponding output pulse is wide
Degree is τ1And τ2；Fixed 1 output pulse width of DSR laser is in τ1And τ2When, 2 pump power of fiber amplifier is measured respectively
Data and amplified pulse peak power data calculate 2 pump power of fiber amplifier and amplification according to linear fitting
The slope of pulse peak power relationship afterwards；It is inversely proportional according to the slope with pulse width, with pulse period and fiber amplifier
Pulse width is τ by the directly proportional relationship of 2 amplification efficiency of device1And τ2Under slope express respectively are as follows:Wherein η generation
The amplification efficiency of mass color fiber amplifier 2, T are the periods of pulse；
According to the approximate regulation that pulse width in amplification process is constant, the pulse width in amplification process maintains τ1And τ2；Pulse is wide
Degree is τ1And τ2When, amplified pulse peak power and 2 pump power relationship of fiber amplifier are as follows:
X0 is the amplification threshold value of fiber amplifier 2, PinThe peak power of pulse, P are exported for DSR laser 11And P2It respectively indicates
Pulse width is τ1And τ2Pulse amplifying after peak power, η Tx represents when pump light source acts on fiber amplifier 2 to arteries and veins
Rush the function done, pulse-width τ1And τ2Pulse caused by pulse peak power variable quantity be proportional toWith
Third step calculates coupling ratio:
Peak power variable quantity of the pulse that DSR laser 1 exports after fiber amplifier 2 is (Pout-Pin), PoutIt is required
Obtained peak power；It is τ in pulse width1And τ2When, the pump power variable quantity of fiber amplifier 2 are as follows:
1 output pulse width of DSR laser is from τ1Increase to τ2When, the pump power variable quantity of DSR laser 1 are as follows:
The coupling ratio of coupler 4 is the ratio between DSR laser 1 and the variable quantity of pump power of fiber amplifier 2:
4th step generates super continuous spectrums:
X0 is set by the pump power of the first pump light source 3, the pump power of the second pump light source 5 is set as x0, chooses coupling
The coupling ratio of clutch 4 isAdjusting third pump light source 6 can be realized puts to DSR laser 1 and optical fiber in proportion
Big device 2 energizes, and generates with realizing the super continuous spectrums that spatial distribution does not change with power.
2. a kind of supercontinuum generation method that spatial distribution according to claim 1 does not change with power, it is characterised in that:
The method of linear fit is first-order linear fitting process in the first step and second step.
3. a kind of supercontinuum generation device method according to claim 1, it is characterised in that: including DSR laser
(1), fiber amplifier (2), the first pump light source (3), coupler (4), the second pump light source (5) and third pump light source (6)；
The output end of DSR laser (1) connects fiber amplifier (2), and the output end of the first pump light source (3) connects DSR laser
(1), and by the pump power of the first pump light source (3) it is set as the starting of oscillation threshold value of DSR laser (1), the second pump light source (5)
Output end connect fiber amplifier (2), and the pump power of the second pump light source (5) is set as fiber amplifier (2)
Amplify threshold value, coupler (4) is one-to-two coupler, the input of output end connection coupler (4) of third pump light source (6)
End, two output ends of coupler (4) are separately connected DSR laser (1) and fiber amplifier (2)；By by claim 1 institute
The pumping light power of third pump light source (6) is distributed to DSR laser by the coupling ratio for the coupler (4) that the method for stating is calculated
(1) and fiber amplifier (2) spatial distribution, can be generated not export with the super continuous spectrums that power changes.
4. a kind of supercontinuum generation device method according to claim 1, it is characterised in that: including DSR laser
(1), fiber amplifier (2), the first pump light source (3), coupler 4 and third pump light source (6)；The output of DSR laser (1)
End connection fiber amplifier (2), the output end of the first pump light source (3) connect DSR laser (1), and by the first pump light source
(3) pumping light power is set as the starting of oscillation threshold value of DSR laser (1), and coupler (4) is one-to-two coupler, third pumping
The input terminal of output end connection coupler (4) of light source (6), two output ends of coupler (4) are separately connected DSR laser
(1) and fiber amplifier (2)；Third is pumped by the coupling ratio of the coupler (4) calculated by claim 1 the method
The pumping light power of Pu light source (6) distributes to DSR laser (1) and fiber amplifier (2), can generate spatial distribution not with function
The super continuous spectrums output that rate changes.
5. a kind of supercontinuum generation device method according to claim 1, it is characterised in that: including DSR laser
(1), fiber amplifier (2), coupler (4), the second pump light source (5) and third pump light source (6)；DSR laser (1) it is defeated
Outlet connects fiber amplifier (2), and the output end of the second pump light source (5) connects fiber amplifier (2), and coupler (4) is one
Divide two couplers, the input terminal of output end connection coupler (4) of third pump light source (6), two output ends of coupler (4)
It is separately connected DSR laser (1) and fiber amplifier (2)；Pass through the coupler calculated by claim 1 the method
(4) pumping light power of third pump light source (6) is distributed to DSR laser (1) and fiber amplifier (2) by coupling ratio, i.e.,
Spatial distribution can be generated not export with the super continuous spectrums that power changes.
6. a kind of supercontinuum generation device method according to claim 1, it is characterised in that: including DSR laser
(1), fiber amplifier (2), coupler (4) and third pump light source (6)；The output end of DSR laser (1) connects fiber amplifier
Device (2), coupler (4) are one-to-two coupler, the input terminal of output end connection coupler (4) of third pump light source (6), coupling
Two output ends of clutch (4) are separately connected DSR laser (1) and fiber amplifier (2)；By by side described in claim 1
The pumping light power of third pump light source (6) is distributed to DSR laser (1) by the coupling ratio for the coupler (4) that method is calculated
With fiber amplifier (2), spatial distribution can be generated and do not exported with the super continuous spectrums that power changes.
7. a kind of supercontinuum generation device method according to claim 1, it is characterised in that: including DSR laser
(1), fiber amplifier (2), the first pump light source (3) and the second pump light source (5)；The output end of DSR laser (1) connects light
The output end of fiber amplifier (2), the first pump light source (3) connects DSR laser (1), and the output end of the second pump light source (5) connects
Connect fiber amplifier (2)；Using the coupling ratio calculated by claim 1 the method, by the first pump light source (3) and
The pumping light power of two pump light sources (5) is proportionately distributed to DSR laser (1) and fiber amplifier (2), can generate spectrum
Distribution is not exported with the super continuous spectrums that power changes.
8. a kind of supercontinuum generation device according to claim 3 to 7 any bar, it is characterised in that: the DSR laser
Device (1) can not substituted by the peak power of other types with the light-pulse generator that pump power changes, and adjust pulse for example, by using electricity
By the laser of shaping pulse and amplification.
9. a kind of supercontinuum generation device according to claim 3 to 7 any bar, it is characterised in that: the DSR laser
The light impulse length range of device (1) output guarantees that pulse width is almost when the amplification in fiber amplifier (2) in femtosecond to microsecond
Constant, amplified pulse peak power is linearly increased with the pump power of fiber amplifier (2).
10. a kind of supercontinuum generation device according to claim 3 to 7 any bar, it is characterised in that: in fiber amplifier
Gain fibre nonlinear effect is weaker in device (2), causes in the case where cannot generating super continuous spectrums in amplification process, needs to add
Nonlinear dielectric (8).
11. a kind of supercontinuum generation device according to claim 10, it is characterised in that: the nonlinear dielectric (8)
Including the various optical fiber that can produce nonlinear transformation, such as traditional passive optical fiber, doped fiber, microstructured optical fibers, tapered fiber.
12. a kind of supercontinuum generation device according to claim 10, it is characterised in that: deposited in nonlinear dielectric (8)
Compared with strong reflection light echo, need to add isolator (7) between fiber amplifier (2) and nonlinear dielectric (8).
13. a kind of supercontinuum generation device according to claim 3 to 7 any bar, it is characterised in that: device in device
Connection type be by tail optical fiber be connected.
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| CN106785865A (en) * | 2016-12-22 | 2017-05-31 | 北京大学深圳研究生院 | A kind of super continuum light composes generation device |
| CN108879300A (en) * | 2018-06-04 | 2018-11-23 | 华南师范大学 | Super continuum source system and method based on the pumping of double bound state mode locking pulses |
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| CN103296566A (en) * | 2013-06-01 | 2013-09-11 | 中国人民解放军国防科学技术大学 | Method for increasing power proportion of supercontinuum long waves in fluoride fiber |
| EP2942847A1 (en) * | 2014-05-09 | 2015-11-11 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Method and device for creating supercontinuum light pulses |
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