CN102306894A - Graphene-based multi-wavelength Q-modulation rare-earth-doped fiber laser - Google Patents
Graphene-based multi-wavelength Q-modulation rare-earth-doped fiber laser Download PDFInfo
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Abstract
The invention provides a graphene-based multi-wavelength Q-modulation rare-earth-doped fiber laser, relating to a laser. The laser comprises a multi-wavelength frequency-stabilizing passive Q switch, a rare-earth-doped optical fiber, a multi-wavelength optical comb filter, a pumping source, a WDM (wavelength division multiplexing) and an output photo-coupler, wherein the multi-wavelength frequency-stabilizing passive Q switch, the rare-earth-doped optical fiber, the multi-wavelength optical comb filter, the WDM and the output photo-coupler are sequentially connected in series; pump light is injected into a ringlike fiber feedback resonant cavity by the WDM; and an output end of the photo-coupler is used for outputting multi-wavelength Q-modulation pulse lasers generated by oscillation in the resonant cavity. By using the strong saturable absorption characteristic of the graphene and exciting FWM (four-wave mixing) effects to manufacture the optical access type multi-wavelength frequency-stabilizing passive Q switch, the homogeneous broadening effect in the rare-earth-doped optical fiber is restrained to output the stable multi-wavelength Q-modulation pulse lasers, thus covering the gain spectrum range of the most of rare-earth-doped optical fibers at present.
Description
Technical field
The present invention relates to a kind of laser, particularly relate to a kind of multi-wavelength and Q-modulating Rear Earth Doped Fiber Laser based on Graphene.
Background technology
Fiber laser have other traditional lasers incomparable high conversion efficiency, high-output power, high light beam quality, high stability, wideband adjustable property and easy miniaturization, need not freeze, safeguard characteristics such as simple.
The multi-wavelength and Q-modulating pulsed laser source has caused domestic and international laser science man's extensive interest recently because of having huge potential application in fields such as wavelength division multiplexing photosystem, the processing of photon microwave signal, Terahertz generation sources.Yet present most of Q adjusting optical fiber lasers only single wavelength swash and to penetrate the still rare report of multi-wavelength and Q-modulating pulse laser.Swash the generation penetrate although the wide gain wavelength scope of rare-earth doped optical fibre helps multi-wavelength, the uniform gain spreading characteristic of rare-earth doped optical fibre causes being difficult at room temperature realize that a plurality of wavelength swash simultaneously penetrates.This just requires other supplementary technologies to suppress the uniform gain broadening, mainly comprises at present: rare earth doped fiber is freezed to ultralow temperature such as liquid nitrogen refrigerating to 77K, extraordinary rare earth doped fiber of exploitation such as twin-core fiber, uses and introduce non-linear gain such as four wave mixing, excited Raman/Brillouin scattering in phase-modulator or frequency shifter, the chamber.Wherein, introducing four wave mixing technology in the chamber maybe be the simplest, be easy to realize.Several km of highly nonlinear optical fiber that the researcher will grow usually very much or photonic crystal fiber insert in the multi-wavelength rare earth doped fiber laser cavity and excite non-linear four wave mixing, but so long nonlinear optical fiber will make system cost significantly increase.Therefore, develop a kind of low cost, high non-linearity optical material, and realize that finally sharp the penetrating of stable multi-wavelength seems very necessary so that easily excite four wave mixing to suppress the uniform gain broadening of rare earth doped fiber.
Graphene was found to be authorized Nobel Prize in physics to 2010 from 2004; Just become the focus of international research in the period of short 6 and obtain extensive approval ([1] A.K.Geim and K.S.Novoselov of academia; " The rise of graphene "; Nat.Mater.; Vol.6 (3), pp.183-191,2007); Come from its unique two-dimentional atomic structure and show many unusual physical characteristics, possibly become the new foundation stone of numerous subjects such as micro-nano electronics, electrochemistry, magnetics, optics.In the photoelectron research field; Graphene has shown many superior functions as saturable absorber; Comprise extremely low saturated light intensity; Ultra wide saturated absorption wave-length coverage; Bigger modulation depth; Can bear remarkable advantage ([2] Q.Bao such as high luminous power and optical fiber compatibility; H.Zhang; Y.Wang; Z.Ni; Y.Yan, Z.X.Shen, K.P.Loh; And D.Y.Tang; " Atomic-layer graphene as asaturable absorber for ultrafast pulsed lasers ", Adv.Funct.Mater., vol.19 (19); 3077-3083,2009).Therefore, utilize grapheme material to make Q switching, have great development prospect.In addition, because grapheme material also possesses high third-order non-linear coefficient up to | χ
(3)|～10
-7Esu; Than big 8 one magnitude of common quartz glass optical fiber; In ultra-thin graphene film, just can easily produce strong non-linear four wave mixing ([3] E.Hendry, P.J.Hale, J.Moger; A.K.Savchenko; And S.A.Mikhailov, " Coherent nonlinear optical response of graphene, " Phys.Rev.Lett.vol.105; Pp.97401-97404,2010).Therefore, grapheme material can be introduced into and can realize stable multi-wavelength and Q-modulating pulse laser output in the rare-earth doped optical fibre resonant cavity that has the multi-wavelength light filter simultaneously as the multi-wavelength stable device of saturable absorption Q regulator and non-linear four wave mixing.
Summary of the invention
The object of the present invention is to provide a kind of multi-wavelength and Q-modulating Rear Earth Doped Fiber Laser based on Graphene.
The present invention is provided with multi-wavelength frequency stabilization passive Q-switch, rare-earth doped optical fibre, multi-wavelength light comb filter, pumping source, wavelength division multiplexer and output optical coupler;
Said multi-wavelength frequency stabilization passive Q-switch, rare-earth doped optical fibre, multi-wavelength light comb filter, wavelength division multiplexer and output optical coupler are connected in series the fiber annular reaction cavity that constitutes a closure successively mutually; The pump light of pumping source output is through the pumping input injection fibre loop feedback resonant cavity of wavelength division multiplexer, and the output of optical coupler is used for the multi-wavelength and Q-modulating pulse laser that concussion produces in the output cavity.
Said multi-wavelength frequency stabilization passive Q-switch can adopt the multi-wavelength frequency stabilization passive Q-switch through the optical fiber compatible type that grapheme material is attached to the fiber end face structure.Saidly can adopt the photoinduction sedimentation through the method that grapheme material is attached to fiber end face.
When the present invention utilizes the strong saturable absorption characteristic of grapheme material; Excite its four-wave mixing effect to process the multi-wavelength frequency stabilization passive Q-switch of optical fiber access type; Even broadening effect through suppressing in the Rear Earth Doped Fiber Laser is exported to realize stable multi-wavelength and Q-modulating pulse laser; Promptly in sharp the penetrating of the stable multi-wavelength of realization, the power of its each wavelength is Q impulse output.Because grapheme material all possesses about 0.6～3 μ m of good saturated absorption characteristic in wide wave-length coverage, it has contained the gain spectral scope of present most rare-earth doped optical fibre.Therefore adopted the most general Er-doped fiber in the selected different rare-earth doped optical fibre embodiment and be equipped with corresponding pump light source, optical comb filter, wavelength division multiplexer and optical coupler and just can make up required multi-wavelength and Q-modulating fiber laser in the wavelength region may widely at the utmost point.
Description of drawings
Fig. 1 is that the structure of the embodiment of the invention is formed sketch map.
Fig. 2 possesses the experimental result of the strong four-wave mixing effect that suppresses the even broadening of rare-earth doped optical fibre for the checking grapheme material for the present invention.In Fig. 2, abscissa is wavelength (nm), and ordinate is output laser power (dBm); Curve a is the laser linewidth of not passing through grapheme material; Curve b is through the laser linewidth behind the grapheme material.
Fig. 3 utilizes the photoinduction sedimentation for the embodiment of the invention and grapheme material is deposited on the sketch map of the multi-wavelength frequency stabilization passive Q-switch of processing the optical fiber compatible type on the fiber end face.In Fig. 3, mark C is for injecting laser, and D is a multi-wavelength frequency stabilization Q switching.
Fig. 4 realizes an embodiment of 11 wavelength Q-switch laser outputs simultaneously in 1556.6～1558.7nm scope for the present invention adopts Er-doped fiber.In Fig. 4, mark E is a Graphene multi-wavelength frequency stabilization passive Q-switch, and F is the output of 1556.6～1558.7nm multi-wavelength and Q-modulating laser.
Fig. 5 is the spectrogram of the output laser of embodiment shown in Figure 3.In Fig. 5, abscissa is wavelength (nm), and ordinate is Output optical power (dBm).
Fig. 6 is the Q impulse sequential chart of the output laser of embodiment shown in Figure 3.In Fig. 6, abscissa is time (μ s), and ordinate is laser pulse intensity (a.u.).
Embodiment
Referring to Fig. 1, the embodiment of the invention is provided with multi-wavelength frequency stabilization passive Q-switch 1, rare-earth doped optical fibre 2, multi-wavelength light comb filter 3, pumping source 4, wavelength division multiplexer 5 and output optical coupler 6.Said multi-wavelength frequency stabilization passive Q-switch 1, rare-earth doped optical fibre 2, multi-wavelength light comb filter 3, wavelength division multiplexer 5 and output optical coupler 6 successively mutually serial connection constitute the fiber annular reaction cavity of a closure; The pump light of pumping source 4 outputs is through the pumping input injection fibre loop feedback resonant cavity of wavelength division multiplexer 5, and the output of optical coupler 6 is used for the multi-wavelength and Q-modulating pulse laser that concussion produces in the output cavity.
Said multi-wavelength frequency stabilization passive Q-switch 1 can adopt the multi-wavelength frequency stabilization passive Q-switch through the optical fiber compatible type that grapheme material is attached to the fiber end face structure.Saidly can adopt the photoinduction sedimentation through the method that grapheme material is attached to fiber end face.In Fig. 1, mark A represents the pump light input, and B represents laser output.
The present invention will utilize multi-wavelength frequency stabilization passive Q-switch 1 that grapheme material processes and rare-earth doped optical fibre 2 and optical comb filter 3 to connect and compose the fiber annular reaction cavity of multi-wavelength; Pump light is then penetrated by the multi-wavelength and Q-modulating pulse laser is sharp from the output port of output optical coupler 6 through wavelength division multiplexer 5 injection fibre loop feedback resonant cavitys.
The present invention proposes to be applied to the even spreading characteristic that the Rear Earth Doped Fiber Laser system will excite four-wave mixing effect and greatly suppress rare-earth doped optical fibre because Graphene has superpower non linear coefficient first.Therefore, utilize the four-wave mixing effect of the Graphene that the present invention finds and propose, can make multi-wavelength frequency stabilizer based on this material.
Referring to Fig. 2; Utilize the common Er-doped fiber continuous wave laser that is output as single wavelength 1550nm laser to do confirmatory experiment, when pump power is 139mW, test through before the grapheme material with after laser linewidth; Curve a is the laser linewidth of not passing through grapheme material, is 0.02nm; Curve b is through the laser linewidth behind the grapheme material, is 0.045nm.Obviously, because the four wave mixing broadening of spectral lines that Graphene evokes has increased more than one times through output laser linewidth behind the Graphene, this non-linear broadening of spectral lines that causes will help suppressing the even broadening of rare-earth doped optical fibre.Therefore the four-wave mixing effect with Graphene combines with its saturated absorption characteristic, just can in Rear Earth Doped Fiber Laser, form the adjusting Q pulse laser output of multi-wavelength effectively.
Fig. 3 provides a kind of method of making multi-wavelength frequency stabilization passive Q-switch, and is specific as follows:
Get one section monomode fiber 7 that only has an end to have connector, its end face 7a that has joint is immersed in 8 li of the pure Graphene aqueous dispersions of 0.25mg/mL, other end 7b connects the output of semiconductor laser 9.The 974nm laser of semiconductor laser output 100mW injects graphene aqueous solution through monomode fiber, and forms optical gradient field betwixt from high in the end and also form the thermal gradient field; Graphene in the aqueous solution will be deposited on the fiber end face of connector gradually, behind the logical about 20min of light this monomode fiber taken out and oven dry.Other gets one section monomode fiber 10 that only has an end to have connector, its not an end of belt lacing be 10a, its end 10b who has a joint then is connected with 7a through optical fiber ring flange 11.Thus, then utilize the photoinduction method to process optical fiber compatible type multi-wavelength frequency stabilization passive Q-switch, shown in its assembling process such as Fig. 3 frame of broken lines based on grapheme material.
Fig. 4 shows and adopts the structure chart of Er-doped fiber as the multi-wavelength and Q-modulating fiber laser of gain media.
Mark 12 is that long the growing in the bat of 1550nm wavelength of one section 30m is the polarization maintaining optical fibre of 4mm, and 13 is a Polarization Controller; 14 is one 1 * 2 type 50:50 optical couplers; 15 is optical circulators of one three port, and wherein 15a, 15b and 15c are first port, second port and the 3rd ports of this circulator; 16 is wavelength division multiplexers, and wherein 16a, 16b and 16c are signal end, common port and the pumping inputs of this wavelength division multiplexer; 17 is the long Er-doped fibers of one section 1.2m; 18 is Polarization Controllers; 19 is output optical couplers of one 1 * 2 type 90:10, and wherein 19a, 19b and 19c are input, 90% output and 10% outputs of this optical coupler; 20 is 974nm long wavelength semiconductor lasers.
Polarization maintaining optical fibre 12 is connected in series with Polarization Controller 13, and the two not interconnective port connects two output ports of 1 * 2 type 50:50 optical coupler 14 respectively.The input port of 1 * 2 type 50:50 optical coupler 14 links to each other with the second port one 5b of the optical circulator 15 of three ports, has constituted the multi-wavelength light comb filter of free spectral range 0.2nm thus.The 7b of multi-wavelength frequency stabilization passive Q-switch meets the signal end 16a of wavelength division multiplexer 16 among Fig. 3, and the 10a of multi-wavelength frequency stabilization passive Q-switch meets the input 19a of the output optical coupler 19 of 1 * 2 type 90:10.The common port 16b of wavelength division multiplexer 16 connects Er-doped fiber 17 1 ends, and an other end of Er-doped fiber 17 then is connected with the 3rd port one 5c of the optical circulator 15 of three ports.90% output 19b of the output optical coupler 19 of 1 * 2 type 90:10 is connected with an end of Polarization Controller 18, and an other end of Polarization Controller 18 then links to each other with the first port one 5a of the optical circulator 15 of three ports.Constituted a fiber annular reaction cavity thus.The output pump light of 974nm long wavelength semiconductor laser 20 meets the pumping input 16c of wavelength division multiplexer 16, and 10% output 19c of the output optical coupler 19 of 1 * 2 type 90:10 then is the output of multi-wavelength and Q-modulating pulse laser.When input 974nm pumping light power is 31mW, utilize spectrometer, photodetector and oscilloscope recorded respectively this embodiment output laser multi-wavelength spectrum and to the Q impulse sequential chart of certain wavelength wherein.
Fig. 5 is the output spectrum of this embodiment of measurement.Can be known that by Fig. 5 in the peak power fluctuation range of 3dB, laser has realized that 11 stable wavelength swash and penetrated that its wave-length coverage is at 1556.6～1558.7nm, wavelength interval Δ λ is 0.2nm.
Fig. 6 is the Q impulse sequential chart of this embodiment of measurement.Its repetition rate is 9.9kHz.
Claims (3)
1. based on the multi-wavelength and Q-modulating Rear Earth Doped Fiber Laser of Graphene, it is characterized in that being provided with multi-wavelength frequency stabilization passive Q-switch, rare-earth doped optical fibre, multi-wavelength light comb filter, pumping source, wavelength division multiplexer and output optical coupler;
Said multi-wavelength frequency stabilization passive Q-switch, rare-earth doped optical fibre, multi-wavelength light comb filter, wavelength division multiplexer and output optical coupler are connected in series the fiber annular reaction cavity that constitutes a closure successively mutually; The pump light of pumping source output is through the pumping input injection fibre loop feedback resonant cavity of wavelength division multiplexer, and the output of optical coupler is used for the multi-wavelength and Q-modulating pulse laser that concussion produces in the output cavity.
2. the multi-wavelength and Q-modulating Rear Earth Doped Fiber Laser based on Graphene as claimed in claim 1 is characterized in that said multi-wavelength frequency stabilization passive Q-switch adopts the multi-wavelength frequency stabilization passive Q-switch through the optical fiber compatible type that grapheme material is attached to the fiber end face structure.
3. the multi-wavelength and Q-modulating Rear Earth Doped Fiber Laser based on Graphene as claimed in claim 1 is characterized in that said through grapheme material being attached to the method employing photoinduction sedimentation of fiber end face.
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| CN103337774A (en) * | 2013-05-31 | 2013-10-02 | 西北核技术研究所 | Tunable mode locking fiber laser based on fiber grating and graphene |
| CN103682963A (en) * | 2013-11-29 | 2014-03-26 | 华中科技大学 | Tunable multi-wavelength microfiber laser and production method thereof |
| CN109217086A (en) * | 2018-11-20 | 2019-01-15 | 天津理工大学 | Tunable wave length passive mode-locking ytterbium-doping optical fiber laser based on volume Bragg grating |
| CN110487729A (en) * | 2019-08-12 | 2019-11-22 | 温州大学 | The highly sensitive periodical sensor-based system of inclined optical fiber grating sensor is integrated based on graphene |
| CN114825022A (en) * | 2022-06-27 | 2022-07-29 | 之江实验室 | Adjustable microcavity soliton optical frequency comb system and method based on special doped optical fiber |
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| CN103682963A (en) * | 2013-11-29 | 2014-03-26 | 华中科技大学 | Tunable multi-wavelength microfiber laser and production method thereof |
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| CN109217086A (en) * | 2018-11-20 | 2019-01-15 | 天津理工大学 | Tunable wave length passive mode-locking ytterbium-doping optical fiber laser based on volume Bragg grating |
| CN110487729A (en) * | 2019-08-12 | 2019-11-22 | 温州大学 | The highly sensitive periodical sensor-based system of inclined optical fiber grating sensor is integrated based on graphene |
| CN114825022A (en) * | 2022-06-27 | 2022-07-29 | 之江实验室 | Adjustable microcavity soliton optical frequency comb system and method based on special doped optical fiber |
| CN114825022B (en) * | 2022-06-27 | 2022-09-16 | 之江实验室 | Adjustable microcavity soliton optical frequency comb system and method based on special doped optical fiber |
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Application publication date: 20120104 |