CN100429846C - Self-similar pulsed fiber laser in femtosecond - Google Patents
Self-similar pulsed fiber laser in femtosecond Download PDFInfo
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- CN100429846C CN100429846C CNB2006101236252A CN200610123625A CN100429846C CN 100429846 C CN100429846 C CN 100429846C CN B2006101236252 A CNB2006101236252 A CN B2006101236252A CN 200610123625 A CN200610123625 A CN 200610123625A CN 100429846 C CN100429846 C CN 100429846C
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Abstract
The laser is composed of following parts connected through general optical fiber: laser pump source, wavelength division multiplexing coupler, and ytterbium doped optical fiber, output coupler, mode-locking device of polarization rotation, compensating device for chatter pulse. The mode-locking device of polarization rotation includes polarization controller, isolator and polarization adjuster. The compensating device for chatter pulse consists of Bragg grating of optical fiber, and Faraday mirror. The invention can generate high energy, high power light pulse in femtosecond level, low cost, near to transform limit, with no base seat, and without chatter. The invention is applicable to optical fiber communication, nonlinear optics, super quick optics, and transient state optics widely.
Description
(1) technical field
The present invention relates to a kind of self-similar pulsed fiber laser in femtosecond, belong to nonlinear optical fiber optics and optical fiber communication crossed technical.
(2) background technology
In recent years, the light pulse laser of generation and transmission high power, strict linear chirping characteristics is one of focus of fiber optics research field in the world.In optical fiber positive dispersion zone, the light pulse with gain will be evolved into the parabolical pulse, and this pulse is called as the self similarity light pulse in the nonlinear optics research field.On the mathematics, the light pulse of parabolical self similarity is the non-linear Schrodinger equation (NLSE) that the has gain self-similar solution in optical fiber positive dispersion zone.Normal optical orphan's (producing in the optical fiber negative dispersion zone) can produce the light wave division and can't obtain high power transmission when power improves.And similarity pulse has solved the intensity restricted problem of pulse in the transmission well, and when it was propagated at high power, pulse shape did not change (remaining parabolic shape), has the ability of resisting the light wave division.In addition, all incident pulse energy all transform among the similarity pulse of output.This separates with the orphan of well-known NLS equation under the situation that does not have gain is different, because under the situation that does not have gain, given inceptive impulse finally is evolved into an orphan with fixed amplitude, and remaining energy then falls with the form radiation of dispersive wave.Another characteristic of similarity pulse is exactly that it has strict linear chrip, and this strict linear chrip is easy to carry out pulse compression efficiently, thereby obtains high-energy, high power, no pedestal, approximate transform limit, do not have the light pulse of the femtosecond magnitude of warbling.This self-similarity nature of pulse is only by incident pulse energy and optical fiber parameter decision, and irrelevant with initial pulse shape.
The generation of similarity pulse has many methods.In fiber amplifier, can adopt that the vertical constant distribution of gain parameter, longitudinal index distribute, methods such as the stimulated Raman effect of optical fiber and dispersion decreasing fiber.The development of self similarity fiber laser need solve the feedback of similarity pulse evolution and the locked mode problem of similarity pulse.Such as,
Deng people (F.O.Ilday, J.R.Buckley, W.G.Clarkand F.W.Wise, Self-similar Evolution of Parabolic Pulse in a Laser, Phys.Rev.Lett, 2004,92 (21): 213902 (1-4); C.K.Nielsen, B.Ortac, T.Schreiber, andJ.Limpert, Self-starting Self-similar All-polarization Maintaining Yb-dopedFiber Laser, Opt.Lett, 2005,13 (23):, use 4 kinds of optical devices to constitute a similarity pulse laser 9346-9351.) according to dispersion management orphan design principle: one section monomode fiber (SMF) with positive GVD, as the main body of similarity pulse evolution; Short as far as possible a bit of gain fibre (GAIN) is as the gain media of laser, its GVD and non-linear can ignoring; One section saturated absorbing body (SA) provides locked mode and output coupling for laser; Dispersive delay line (DDL) has negative GVD but is non-linear negligible, so that the similarity pulse that forms is effectively compressed.And numerical simulation and experimental study have been carried out.But,
Deng people's design principle and experimental technique, what produced is not the similarity pulse of stricti jurise, or dispersion management orphan's pulse.Subsequently,
F.W.Wise and F.X.Kaertner (
F.W.Wise, and F.X.Kaertner, Possibility of Self-similar pulse Evolution in a Ti:sapphirelaser, Opt.Express, 2004,12 (12): 2731-2738.) possibility of ti sapphire laser generation similarity pulse laser has been carried out theoretic analysis, do not have the related experiment report, and ti sapphire laser has cost an arm and a leg.People such as C.Finot (C.Finot, S.Pitois, and G.Millot, Regenerative40Gbit/s Wavelength Converter Based on Similariton Generation, Opt.Lett, 2005,30 (14): 1776-1778.) too complicated with the experimental provision of the similarity pulse laser of full optical device design.So, experimentally, also there is not the normal optical device that really can use up till now, obtain similarity pulse by stable feedback cavity and ripe pulse mode-locked technology.
(3) summary of the invention
The objective of the invention is to problem at existing short pulse fiber laser technology existence, a kind of self similarity fiber laser based on similarity pulse amplification and compress technique is provided, and it can produce high-energy, high power, no pedestal, approximate transform limit at low cost, not have the femtosecond magnitude light pulse of warbling.This self similarity fiber laser can be used as light source of fine qualities, all is widely used in fields such as optical fiber communication, nonlinear optics, ultrafast optics and transient optical state.
Concretely, self-similar pulsed fiber laser in femtosecond of the present invention by pump laser source, wave division multiplex coupler (WDM), monomode fiber, mix ytterbium (Yb
3+) optical fiber, output coupler (OC), polarization rotation lock die device, pulse chirp compensation arrangement and ordinary optic fibre connect and compose jointly, wherein, polarization rotation lock die device is made up of with polarization adjuster (PC2) Polarization Controller (PC1), isolator (ISO), and the pulse chirp compensation arrangement is made up of inhomogeneous fiber Bragg grating (Brag fiber) and faraday mirror (FARA).The interconnected relationship of each parts is: wave division multiplex coupler, monomode fiber, Yb dosed optical fiber, output coupler, Polarization Controller, isolator and polarization adjuster are in turn connected to form optical fiber loop by ordinary optic fibre; Pump laser source is connected with the input port I of wave division multiplex coupler; The inhomogeneous fiber Bragg grating is connected with the input port II of output coupler, is connected with optical fiber splice between inhomogeneous fiber Bragg grating and the faraday mirror.Described monomode fiber is the long monomode fiber of 8m～13m, can provide to be not less than β
2Positive dispersion, β
2=+6.0 * 10
-1Ps
2m
-1Its non linear coefficient is less than or equal to γ, γ=2 * 10
-3W
-1m
-1Its core radius is not less than 5 μ m.
Parameter request and function thereof to each parts among the present invention further specifies as follows below:
Pump laser source: adopt the pump laser source of existing commercially available 980nm, its inside has Fiber Bragg Grating (Brag fiber) structure, makes pump light source have high stability and lower noise jamming.
Wave division multiplex coupler: requiring its frequency division scope is 976nm～1560nm, can satisfy pumping fully and mix ytterbium (Yb
3+) requirement of optical fiber.
Yb dosed optical fiber: requiring its absorption coefficient is α=25 ± 5dB/m; Numerical aperture N.A.=0.13; Its length is 0.2m～6m, and its doping content is 10
-5～10
-7Generally speaking, length is long more, and to the requirement of doping content low more (being that concentration is low more), length is short more, and to the requirement of doping content high more (being that concentration is high more), for example when its length was 0.2m, its doping content can select 10 for use
-5, when its length was 6m, its doping content can select 10 for use
-7
Output coupler: requiring its laser output coupling efficiency is 3～10%.
Inhomogeneous fiber Bragg grating: negative dispersion β
2≤-7.0 * 10
-1Ps
2m
-1, its centre wavelength is positioned at 1050nm, and the reflection spectrum width is 0.1～0.3nm, can compensate warbling of similarity pulse effectively.
Faraday mirror: adopt the commercially available universal product, can eliminate linear birefrigence.Faraday mirror rotates the signal polarization state of light, be that reverberation and incident light are cross-polarization, the phase shift that linear birefrigence as a result produces is offset through once coming and going just, and nonlinear phase shift is unaffected, meanwhile, can also eliminate the walk-off effect that high birefringence optical fiber causes owing to the group velocity mismatch.
Polarization Controller (PC1), isolator (ISO) constitute nonlinear polarization rotation addition clamping apparatus with polarization adjuster (PC2), are equivalent to the function of class saturated absorbing body.
The operation principle of each optical device of this fiber laser and similarity pulse generation of Laser process are: the pumping laser of 980nm is coupled in the fiber optic loop through WDM, is mixing ytterbium (Yb
3+) produce the amplifying signal light of 1050nm in the optical fiber, on the one hand, this flashlight transmits in the positive dispersion zone of Yb dosed optical fiber, and the gain effect of dispersion of Yb dosed optical fiber (being equivalent to a kind of loss) has narrowed because the pulse frequency spectrum of widening from phase modulated (SPM); Meanwhile, the frequency spectrum of flashlight is also further compressed, narrows by the positive dispersion effect of monomode fiber; Two kinds of frequency spectrums time domain broadening that effect all makes pulse that narrows, thus the peak power of signal pulse reduced widely, flashlight is further amplified in Yb dosed optical fiber, produce positive linear chrip simultaneously.When its time domain broadening arrives certain critical value, will form similarity pulse with parabolic shape intensity.On the other hand, because the effect of Polarization Controller (PC1), isolator (ISO) and polarization adjuster (PC2), similarity pulse is easy to reach the laser threshold of single annular mirror, has the similarity pulse laser that linear positive is warbled thereby form.And then, the impulse compensation technology that inhomogeneous fiber Bragg grating (Bragfiber) by output coupler (OC) port 2 combines with faraday mirror (FARA), the linear positive that compensates similarity pulse is effectively warbled, and at last the similarity pulse by output coupler port IV output is high-energy, high power, no pedestal, approximate transform limit, does not have a laser pulse of the femtosecond magnitude of warbling.
Compare with the existing fiber pulse laser, the present invention has following advantage and effect:
(1) laser of the present invention can produce high-energy, high power, no pedestal, approximate transform limit, not have the light pulse laser of the femtosecond magnitude of warbling.
(2) if the present invention adopts high concentration (10
-5Magnitude) doped fiber, only needing 0.1cm～0.3cm Yb dosed optical fiber can produce power be that 2.2nJ, power output are that 250mW and time domain are the similarity pulse laser of 30fs.If adopt low concentration (10
-7Magnitude) doped fiber will reach same requirement, and its doped fiber length also only needs in the 6m.
(3) in a single day reach laser threshold, the similarity pulse laser spectroscopy of output is highly stable.Light impulse length is the highest can to reach 30fs.
(4) the present invention is simple in structure, and cost is lower.
(4) description of drawings
Fig. 1 is the structural representation of self-similar pulsed fiber laser in femtosecond of the present invention.
(5) embodiment
In Fig. 1,1 for pump laser source, 2 for wave division multiplex coupler (WDM), 3 for the input port I of WDM, 4 be that monomode fiber (SMF), 7 is for mixing ytterbium (Yb for the output port III of WDM, 5 is ordinary optic fibre, 6
3+) optical fiber, 8 be that output coupler (OC), 9 is faraday mirror (FARA) for inhomogeneous fiber Bragg grating (Brag fiber), 18 for the input port III of WDM, 17 for polarization adjuster (PC2), 16 for isolator (ISO), 15 for Polarization Controller (PC1), 14 for the output port III of OC, 13 for the output port IV of OC, 12 for the input port II of OC, 11 for the input port I of OC, 10.Wherein, Polarization Controller, isolator and polarization adjuster constitute polarization rotation lock die device jointly, and inhomogeneous fiber Bragg grating and faraday mirror are formed the pulse chirp compensation arrangement.
The interconnected relationship of each parts is: wave division multiplex coupler 2, monomode fiber 6, Yb dosed optical fiber 7, output coupler 8, Polarization Controller 13, isolator 14 and polarization adjuster 15 are in turn connected to form optical fiber loop by ordinary optic fibre 5; Pump laser source 1 is connected with the input port I of wave division multiplex coupler 2; Inhomogeneous fiber Bragg grating 17 is connected with the input port II of output coupler 8, is connected with optical fiber splice between inhomogeneous fiber Bragg grating 17 and the faraday mirror 18.Except that Yb dosed optical fiber and monomode fiber and being connected of optical fiber loop adopt the welding manner, other parts connect with all adopting welding or optical fiber splice being connected of optical fiber loop.
Following table is that each parts of the present invention adopt the resulting result of different parameters, and from this table as seen, the present invention can obtain stable laser pulse output in described parameter area.
| The doping content of Yb dosed optical fiber | Yb dosed optical fiber length | Yb dosed optical fiber β 2 | The non linear coefficient of SMF is γ | The length of SMF | SS centre wavelength | The SS power output | SS exports | |
| Execution mode | ||||||||
| 1 | 10 -5 | 0.2m | 40×10 -3 ps 2m -1 | 2×10 -3 W -1m -1 | 8m | 1050nm | 250mW | 2.2nJ |
| Execution mode 2 | 10 -7 | 6m | 40×10 -3 ps 2m -1 | 2×10 -3 W -1m -1 | 13m | 1050nm | 250mW | 2.2nJ |
The present invention is not limited to above-mentioned embodiment, and modification that essence any and of the present invention is identical or replacement all belong to protection scope of the present invention.
Claims (6)
1, a kind of self-similar pulsed fiber laser in femtosecond, it is characterized in that: it is by pump laser source (1), wave division multiplex coupler (2), monomode fiber (6), Yb dosed optical fiber (7), output coupler (8), polarization rotation lock die device, pulse chirp compensation arrangement and ordinary optic fibre (5) connect and compose jointly, wherein, polarization rotation lock die device is by Polarization Controller (13), isolator (14) and polarization adjuster (15) are formed, the pulse chirp compensation arrangement is made up of inhomogeneous fiber Bragg grating (17) and faraday mirror (18), and its interconnected relationship is: wave division multiplex coupler (2), monomode fiber (6), Yb dosed optical fiber (7), output coupler (8), Polarization Controller (13), isolator (14) and polarization adjuster (15) are in turn connected to form optical fiber loop by ordinary optic fibre (5); Pump laser source (1) is connected with the input port I of wave division multiplex coupler (2); Inhomogeneous fiber Bragg grating (17) is connected with the input port II of output coupler (8), is connected with optical fiber splice between inhomogeneous fiber Bragg grating (17) and the faraday mirror (18); Described monomode fiber (6) length is 8m～13m, and the positive dispersion that is provided is not less than 6.0 * 10
-1Ps
2m
-1, its non linear coefficient is less than or equal to 2 * 10
-3W
-1m
-1, its core radius is not less than 5 μ m.
2, fiber laser as claimed in claim 1 is characterized in that: described pump laser source adopts the pump laser source of 980nm.
3, fiber laser as claimed in claim 1 is characterized in that: the frequency division scope of described wave division multiplex coupler is 976nm～1560nm.
4, fiber laser as claimed in claim 1 is characterized in that: the absorption coefficient of described Yb dosed optical fiber is 25 ± 5dB/m, and numerical aperture is 0.13, and its length is 0.2m～6m, and doping content is 10
-7～10
-5
5, fiber laser as claimed in claim 1 is characterized in that: the laser output coupling efficiency of described output coupler is 3～10%.
6, as the described fiber laser of the arbitrary claim of claim 1～5, it is characterized in that: the negative dispersion of inhomogeneous fiber Bragg grating≤-7.0 * 10
-1Ps
2m
-1, its centre wavelength is positioned at 1050nm, and the reflection spectrum width is 0.1～0.3nm.
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| CN100429846C true CN100429846C (en) | 2008-10-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478111B (en) * | 2009-01-19 | 2010-06-02 | 华东师范大学 | Process for generating low repeat frequency ultra-short laser pulse |
| CN102340092A (en) * | 2010-07-21 | 2012-02-01 | 清华大学 | Optical fiber mode locked laser |
| CN102983484A (en) * | 2012-12-24 | 2013-03-20 | 华南师范大学 | Bismuth-doped optical fiber laser with wavelength of mode-locked pulse capable of being dynamically tuned in wide range |
| CN113725709B (en) * | 2021-08-17 | 2022-10-28 | 广东工业大学 | Self-similar pulse mode-locked fiber laser |
| CN113991403B (en) * | 2021-12-27 | 2022-10-11 | 山东省科学院激光研究所 | Femtosecond optical fiber amplification system |
Citations (2)
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|---|---|---|---|---|
| US20060182153A1 (en) * | 2005-02-16 | 2006-08-17 | Jian Liu | Electronically tuned self-starting polarization shaping mode locked fiber laser |
| US20060227816A1 (en) * | 2005-04-06 | 2006-10-12 | Jian Liu | All fiber based short pulse amplification at one micron |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060182153A1 (en) * | 2005-02-16 | 2006-08-17 | Jian Liu | Electronically tuned self-starting polarization shaping mode locked fiber laser |
| US20060227816A1 (en) * | 2005-04-06 | 2006-10-12 | Jian Liu | All fiber based short pulse amplification at one micron |
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