CN106785865A - A kind of super continuum light composes generation device - Google Patents
A kind of super continuum light composes generation device Download PDFInfo
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- CN106785865A CN106785865A CN201611198686.5A CN201611198686A CN106785865A CN 106785865 A CN106785865 A CN 106785865A CN 201611198686 A CN201611198686 A CN 201611198686A CN 106785865 A CN106785865 A CN 106785865A
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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
- H01S3/10084—Frequency control by seeding
- H01S3/10092—Coherent seed, e.g. injection locking
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Abstract
This application discloses a kind of super continuum light spectrum generation device, it includes pumping source, trigger source, coupler, spectrum widening device.Pumping source and trigger source are respectively connecting to coupler, and coupler is connected to spectrum widening device.Pumping source is used to produce continuous pump light and is sent to coupler；Trigger source is used to produce the other seed source light of femtosecond and be sent to coupler；Coupler is used to receive continuous pump light and seed source light according to the power proportions of setting and export mixed light to spectrum widening device；Spectrum widening device is used to carry out spectrum widening to the mixed light of coupler output, so as to produce super continuum light to compose.Present invention incorporates continuous wave pumping and the advantage of relevant femtosecond seed source, by the use of a very faint relevant femto-second laser pulse as seed source, the super continuum light spectrum high-quality, broadening scope is bigger can be produced, and spectrum coherence, signal to noise ratio are significantly improved, improve the distribution of L-band orphan's peak power.
Description
Technical field
The application is related to optical field, and in particular to a kind of super continuum light composes generation device.
Background technology
The generation of super continuous (Supercontinuum, SC) spectrum is referred to when high-power ultrashort light pulse is by non-thread
Property optical medium (such as solid, liquefied gas and semiconductor) during, due to medium in the effect of various nonlinear effects,
Many new frequency contents can be produced in the spectrum of transmission pulse so that spectrum of the output pulse spectrum width much larger than incident pulse
It is wide.SC spectral limits can continue up to ultraviolet and region of ultra-red from visible ray.Its frequency spectrum broadening mechanism comes from nonlinear optics
The nonlinear effects such as self aggregation, Self-phase modulation, Cross-phase Modulation, four-wave mixing and stimulated Raman scattering in medium are total to
Same-action.Optical fiber technology develops the development and perfection for promoting SC spectral technologies rapidly, and its application is constantly extended to frequency measurement,
The generation of ultrashort pulse, optical coherence tomography, laser tolerance and optical communication system etc..The super continuous spectrums of continuous optical pumping
There is high-energy to be input into the characteristics of with high frequency spectrum widening, but the general energy stabilization that is difficult to is distributed the spectrum coherence for becoming reconciled.
The content of the invention
According to an aspect of the present invention, there is provided a kind of super continuum light composes generation device, and it includes pumping source, trigger source, coupling
Clutch, spectrum widening device.Pumping source and trigger source are respectively connecting to coupler, and coupler is connected to spectrum widening device.Pump
Pu source is used to produce continuous pump light and is sent to coupler；Trigger source is used to produce the other seed source light of femtosecond and be sent to
Coupler；Coupler is used to receive continuous pump light and seed source light according to the power proportions of setting and export mixed light to spectrum
Broadening device；Spectrum widening device is used to carry out spectrum widening to the mixed light of coupler output, so as to produce super continuum light to compose.
It is present invention incorporates continuous wave pumping and the advantage of relevant femtosecond seed source, such as very faint relevant using one
Femto-second laser pulse is used as seed source, you can produces the super continuum light spectrum high-quality, broadening scope is bigger, and significantly improves
Spectrum coherence, signal to noise ratio, improve the distribution of L-band orphan's peak power.Meanwhile, faint femtosecond seed source light phase
To being readily available, the manufacturing cost of device is reduced.
Brief description of the drawings
Fig. 1 is the super continuum light spectrum generation device schematic diagram of embodiment one；
Fig. 2 is the super continuum light spectrum generation device frequency spectrum input schematic diagram of prior art；
Fig. 3 is the super continuum light spectrum generation device frequency spectrum output schematic diagram of prior art；
Fig. 4 is the super continuum light spectrum generation device output energy statisticses figure of prior art；
Fig. 5 is the super continuum light spectrum generation device frequency spectrum input schematic diagram of embodiment one；
Fig. 6 is the super continuum light spectrum generation device frequency spectrum output schematic diagram of embodiment one；
Fig. 7 is the super continuum light spectrum generation device output energy statisticses figure of embodiment one.
Specific embodiment
The application is described in further detail below by specific embodiment combination accompanying drawing.
Embodiment one：
It is as shown in Figure 1 the super continuum light spectrum generation device of the present embodiment, it includes continuous optical pumping source 1, femtosecond seed
Source 2, optoisolator 3, fiber coupler 4, spectrum widening device 5, output end 6.
In the present embodiment, it is preferable that continuous optical pumping source 1 is connected to the input of fiber coupler 4 by optoisolator 3
End, in other implementation methods of the invention, can be without setting optoisolator 3.Femtosecond seed source 2 is also connected to fiber coupling
The input of device 4, the output end of fiber coupler 4 is connected to the input of spectrum widening device 5；The spectrum widening of the present embodiment
Device 5 uses high nonlinear coefficient optical fiber, such as HNL-DSF optical fiber, photonic crystal fiber PCF etc., high nonlinear coefficient optical fiber
Spectrum can be made to obtain rapidly broadening.In one embodiment, in order on the wave band of actual optical communication applications (for example
1500nm) there are better effects, spectrum widening device is one section of high non-linearity dispersion shifted fiber, continuous pump light and seed source light
Spectrum widening is carried out through high non-linearity dispersion shifted fiber after mixing, super continuum light spectrum is formed.In one embodiment, Gao Fei
Linear dispersion shifted fiber two, third-order dispersion coefficient be respectively -0.17ps2/ km and 0.0393ps3/ km, nonlinear factor is
15/W/km, it is 10dB/km to be lost, and length is 400m.The output end of high nonlinear coefficient optical fiber 5 is connected to output module 6.
The generation process of super continuum light spectrum is as follows, and continuous optical pumping source 1 produces continuous pump light and passed via optoisolator 3
The input of fiber coupler 4 is delivered to, such as continuous optical pumping source 1 produces continuous laser, continuous pump by encouraging particle to invert
The centre wavelength of Pu light can be designed as 1486nm, and luminous power is 6W.The setting of optoisolator 3 is mainly used in preventing from optical coupling
The fraction light that device 4 is reflected back continuous optical pumping source 1 burns continuous optical pumping source 1.Femtosecond seed source 2 produces other kind of femtosecond
Component light is simultaneously sent to fiber coupler 4；Fiber coupler 4 receives continuous pump light and seed source according to the power proportions of setting
Closing light is exported after light and mixing to high nonlinear coefficient optical fiber 5, high nonlinear coefficient optical fiber 5 is mixed to the output of fiber coupler 4
Closing light carries out spectrum widening, and seed source forms triggering control to pump light during spectrum widening, so as to produce super continuous
Spectrum simultaneously carries out light treatment (such as reflection/transmission to predetermined direction) via output module 6, is accorded with so as to be exported from output module 6
Close the super continuum light spectrum of the direction of the launch.
For the process that continuous light produces super continuum light spectrum as pumping, its cardinal principle is using in nonlinear optics
Modulational instability reaches the effect of video stretching.But modulational instability is driven by random noise, this causes not
After being repeated to experiment in the case of, coherence, signal to noise ratio, power stability of super continuous spectrums etc. are all very poor.Using this reality
The device of example is applied, is used as plus a femtosecond seed source light by the effective range modulated near unstable gain maximum point
Triggering control light, the power ratio noise of increased relevant femtosecond seed source light is big, partly replaces making an uproar in erratic process is modulated
Sound spends modulation, and femtosecond seed source light is in itself relevant and with fixed position on frequency spectrum and size, therefore
The coherence of the super continuous spectrums of generation and stability are greatly improved such that it is able to weaken noise in modulational instability
Role in gain, and then greatly improve coherence, signal to noise ratio, the power stability of super continuous spectrums.Specifically, seed source light
Wavelength be in the corresponding wavelength of continuous pump light maximum modulation point of instability on or near, can using Gaussian pulse type swash
Light pulse, more than a half a width of femtosecond of seed source light, (such as 200 femtoseconds) below a psec, its peak power is in continuous pump
It is adjustable in the range of 0.1% to the 10% of Pu luminous power.
The corresponding wavelength of maximum modulation point of instability of continuous pump light can be according to high non-linearity dispersion shifted fiber
Nonlinear factor, the second order dispersion coefficient of high non-linearity dispersion shifted fiber and continuous pumping light power are calculated.So as to plant
The wavelength of component light can be calculated in the following manner：
The relative frequency Ω of the maximum modulation point of instability of continuous pump light is calculated first, and its computing formula is：
Wherein γ is the nonlinear factor of high non-linearity dispersion shifted fiber, β2It is the two of high non-linearity dispersion shifted fiber
Rank abbe number, P0It is the luminous power of continuous pump light；
Then the corresponding wavelength of continuous pump light maximum modulation point of instability can be calculated by mathematical conversion, the wavelength is
The wavelength of seed source, its computing formula is as follows：
λtrigger=λ0*c/(c+λ0*Ω/(2π))
Wherein, λtriggerIt is the wavelength of seed source, λ0It is the centre wavelength of pump light, c is the light velocity, and π is pi.
Frequency spectrum input when not having seed addition source light is illustrated in figure 2, when continuous wave is input into as pumping, centre wavelength exists
At 1486nm；In Fig. 3, different random noises are added, 400m are transmitted in high nonlinear coefficient optical fiber, repeat 500 results,
Wherein grey lines represent result each time, and black line represents their average case, because continuous pump light is in high non-linearity
The presence of modulational instability in dispersion shifted fiber, super continuum light spectrum occurs in that " the abnormal ripple " of the very high power value of few probability
(rogue wave), the coherence of such super continuum light spectrum is poor；Fig. 4 is after time domain is to plus a wave filter of 1500nm
Statistics produces the situation of orphan's peak power, it is found that orphan's peak power is presented L-type distribution, and this is a kind of performance of the abnormal ripple of light,
Output energy is unstable.
It is illustrated in figure 5 and adds a 200fs half-breadth (its peak work in the place of maximum modulation point of instability (- 32.5THz)
The pulse width obtained at rate 1/e) Gaussian femtosecond seed source light input figure；Fig. 6 is shown plus the frequency after seed source light
Spectrum output figure, with Fig. 3 contrasts, it will be apparent that, its video stretching is wider, does not as a result occur " abnormal ripple ", and spectrum shape is relatively stable, phase
Dryness gets a promotion；In Fig. 7, the output after the light of seed addition source is filtered plus the wave filter of a 1600nm, and count
The distribution of its peak power, with Fig. 4 contrasts, its peak power integrated distribution shows that its stability is obtained very near 85 watts
Big raising.
The present invention is using a very faint relevant femto-second laser pulse as seed source, you can produce it is high-quality, open up
Wide scope it is bigger super continuum light spectrum, and significantly improve spectrum coherence, signal to noise ratio (particularly in L-band, Raman
The wave band of orphan's distribution), (peak power concentrates on a model for very little to improve the distribution of L-band orphan's peak power
In enclosing).Faint femtosecond seed source is relatively easily obtained, reduces the manufacturing cost of device.Meanwhile, present invention incorporates continuous wave
Pumping and the advantage of relevant femtosecond seed source, maintain the excellent specific property that continuous spectrum is produced using continuous wave pumping, i.e., high
Spectral power, smooth spectral line, low pump power, simple experiment setting etc..
Above content is to combine the further description that specific embodiment is made to the application, it is impossible to assert this Shen
Specific embodiment please is confined to these explanations.For person of an ordinary skill in the technical field, do not departing from
On the premise of the design of the application, some simple deduction or replace can also be made.
Claims (10)
1. a kind of super continuum light composes generation device, it is characterised in that including pumping source, trigger source, coupler, spectrum widening device
Part；
The pumping source and the trigger source are respectively connecting to the coupler, and the coupler is connected to the spectrum widening device
Part；
The pumping source is used to produce continuous pump light and is sent to the coupler；
The trigger source is used to produce the other seed source light of femtosecond and be sent to the coupler；
The coupler is used to receive continuous pump light and seed source light according to the power proportions of setting and export mixed light to institute
State spectrum widening device；
The spectrum widening device is used to carry out spectrum widening to the mixed light of coupler output, so as to produce super continuum light
Spectrum.
2. device as claimed in claim 1, it is characterised in that
More than a half a width of femtosecond of the seed source light, below a psec.
3. device as claimed in claim 1, it is characterised in that
The wavelength of the seed source light is on or near the corresponding wavelength of continuous pump light maximum modulation point of instability.
4. device as claimed in claim 1, it is characterised in that
The seed source light uses the seed source light of Gaussian pulse type.
5. device as claimed in claim 1, it is characterised in that
The seed source light is laser pulse.
6. device as claimed in claim 1, it is characterised in that
The wavelength and/or peak power of the seed source light can adjust.
7. device as claimed in claim 6, it is characterised in that
The power of the seed source light is adjustable in the range of 0.1% to the 10% of the continuous pumping light power.
8. the device as described in claim any one of 1-7, it is characterised in that
The spectrum widening device is high nonlinear coefficient optical fiber.
9. the device as described in claim any one of 1-7, it is characterised in that
Also include the optoisolator being connected between the pumping source and the coupler, the optoisolator is used to prevent to reflect
Return the light of the pumping source.
10. the device as described in claim any one of 1-7, it is characterised in that
Also include the output module being connected with the spectrum widening device, the output module is used to carry out light to super continuum light spectrum
Treatment, so as to export the super continuum light spectrum for meeting the direction of the launch.
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| CN201611198686.5A CN106785865A (en) | 2016-12-22 | 2016-12-22 | A kind of super continuum light composes generation device |
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| CN201611198686.5A CN106785865A (en) | 2016-12-22 | 2016-12-22 | A kind of super continuum light composes generation device |
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Cited By (4)
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| CN110277725A (en) * | 2019-07-15 | 2019-09-24 | 中国人民解放军国防科技大学 | Supercontinuum generation method and device with spectral distribution not changing with power |
| CN111164516A (en) * | 2017-09-29 | 2020-05-15 | Asml荷兰有限公司 | Radiation source |
| CN111463648A (en) * | 2019-01-21 | 2020-07-28 | 长春理工大学 | Low-jitter high-repetition-frequency supercontinuum light source |
| CN114200577A (en) * | 2021-12-14 | 2022-03-18 | 天津大学 | Optical waveguide device, design method thereof, and supercontinuum generation device |
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| CN111463648A (en) * | 2019-01-21 | 2020-07-28 | 长春理工大学 | Low-jitter high-repetition-frequency supercontinuum light source |
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| CN114200577A (en) * | 2021-12-14 | 2022-03-18 | 天津大学 | Optical waveguide device, design method thereof, and supercontinuum generation device |
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