CN104518417A - Quantum dot random optical fiber laser device - Google Patents
Quantum dot random optical fiber laser device Download PDFInfo
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- CN104518417A CN104518417A CN201510027435.XA CN201510027435A CN104518417A CN 104518417 A CN104518417 A CN 104518417A CN 201510027435 A CN201510027435 A CN 201510027435A CN 104518417 A CN104518417 A CN 104518417A
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- quantum dot
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Abstract
The invention discloses a quantum dot random optical fiber laser device and relates to laser devices. The quantum dot random optical fiber laser device comprises a green light source, an optical fiber sample for quantum dot deposition, and a convex lens, wherein the optical fiber sample is pumped on the side surface of the green light source; laser beams output by the green light source are collimated by the convex lens; quantum dots adopt core-shell quantum dots made from CdSe/ZnS and have the core diameters of 2.5 nm and the shell thicknesses of 2.6 nm. By taking multiple layers of quantum dot films and quantum dot clusters on the quantum dot optical fiber sample as the gain of the laser device and the center of multiple scattering, the random optical fiber laser device of 644 nm can be obtained through side pumping of green light; laser is modulated by the potential elimination field and waveguide mode of an optical fiber, so that emitted red light has the characteristics of end beams; the shortcomings of poor beam quality, multispectral output changed along with time and the like for a conventional random laser device are overcome.
Description
Technical field
The present invention relates to a kind of laser, particularly relate to a kind of quantum dot random fiber laser.
Background technology
After people's First Observations such as Briskina to Random Laser [1] and theoretical this phenomenon of confirmation [2,3], Random Laser is found [4-8] again in the gain media that semiconductor nanocrystal, polymer thin films and tissue etc. are unordered.Typical case; nano particle or insulator microballoon are dispersed in homogeneously broadening gain media unevenly; Random Laser is produced by optical pumping; this laser passes through its multiple scattering (from scattering medium; such as nano particle) decide frequency, bandwidth sum direction [9,10] of Output of laser.Quantum dot has the size tunable (by size tuning electronic energy level structure) of emission wavelength along with point, and is easily integrated in solid and liquid, so especially receive publicity.Although the quantum dot laser reported obtains research for the characteristic of size and pumping threshold before, the oscillator of these quantum dots suffer from bad beam quality and the multiline spectrum [11,12] along with time variations.Random Laser may be integrated with larger value for optical system, but the quantum dot accidental laser existed at present is difficult to connect with micro-optic original paper and optical fiber.
List of references:
[1]V.M.Markushev,V.F.Zolin,and Ch.M.Briskina,Zh.Prikl.Spektrosk.45,847(1986).
[2]C.Gouedard,D.Husson,C.Sauteret,F.Auzel,and A.Migus,J.Opt.Soc.Am.B 10,2358(1993).
[3]N.M.Lawandy,R.M.Balachandran,A.S.L.Gomes,and E.Sauvain,Nature 368436(1994).
[4]H.Cao,Y.G.Zhao,S.T.Ho,E.W.Seelig,Q.H.Wang,and R.P.H.Chang,Phys.Rev.Lett.82,2278(1999).
[5]H.-J.Eisler,V.C.Sundar,M.G.Bawendi,M.Walsh,H.I.Smith,and V.Klimov,Appl.Phys.Lett.80,4614(2002).
[6]R.C.Polson,M.E.Raikh,and Z.V.Vardeny,C.R.Physique 3,509(2002).
[7]A.Tulek,R.C.Polson,and Z.V.Vardeny,Nat.Phys.6,303(2010).
[8]R.C.Polson and Z.V.Vardeny,Appl.Phys.Lett.85,1289(2004).
[9]D.S.Wiersma,Nat.Phys.4,359(2008).
[10]A.Costela,L.Cerd_an,and I.Gar_cia-Moreno,Prog.Quantum Electron.37,348(2013).
[11]J.Xu and M.Xiao,Appl.Phys.Lett.87,173117(2005).
[12]J.Renner,L.Worschech,A.Forchel,S.Mahapatra,and K.Brunner,Appl.Phys.Lett.89,231104(2006).
Summary of the invention
The object of the present invention is to provide a kind of quantum dot random fiber laser.
The present invention is provided with sample fiber, the convex lens of green-light source, deposition quantum dot.
The sample fiber of described green-light source profile pump deposition quantum dot, the laser beam convex lens that green-light source exports collimate, quantum dot adopts core, the shell type quantum point of CdSe/ZnS material, and the nuclear diameter of quantum dot is 2.5nm, and the thickness of the shell of quantum dot is 2.6nm.
Described green-light source can adopt Nd:YAG times of frequency modulation Q wavelength at 530nm lasing light emitter, repetition rate 10Hz, and the about 10ns of pulse duration, the single pulse energy of output is adjustable.
The sample fiber of described deposition quantum dot adopts following methods preparation:
Be dissolved in by quantum dot in solvent toluene, obtain mixed solution, the concentration of mixed solution is 165mg/ml; Then peel optical fiber off coat, insert in the capillary of 320 μm; Be filled into by mixed solution in capillary, treat that toluene volatilizees, solid-state quantum dot will stay the periphery of optical fiber; Then cut flat fiber end face with optical fiber cutter, obtain the sample fiber of deposition quantum dot, the about 3cm of sample fiber of gained deposition quantum dot is long.
The thickness of quantum dot film is about 244nm, compared to the quantum dot film thickness of individual layer 8nm, is approximately 30 layers; In addition, the cluster of quantum dot can be clear that from scanning electron microscopy; Diameter about hundreds of nanometer of this cluster is to several micron.
Described convex lens can adopt focal length to be the lenticular lens of 50mm.
Green-light source and convex lens can adopt commercial product.
The present invention, by the multi-layer quantum point film above this quanta point optical fiber sample and quantum dot cluster, jointly as the gain of laser and the center of multiple scattering, can obtain the random fiber laser of 644nm through green glow profile pump.This laser is modulated by the waveguide mode of disappear potential field and the optical fiber of optical fiber, makes the ruddiness of transmitting have end and emits beam characteristics.Change the beam quality of traditional accidental laser bad luck and the shortcoming such as multiline output along with time variations.By narrowing of spectrum and time domain impulse, laser characteristics is proved, obtaining pumping threshold is 2.6mJ/cm
2, 4.5 × 10
-7cm
3the laser pulse of 37W peak power, 3.6ns pulse duration, 0.13 μ J is created in the gain media of micro volume.
Visible laser of the present invention adopts quantum dot to be deposited directly to optical fibers.The quantum dot film thick by the about 244nm plating multilayer and quantum dot cluster, it is inner and by the mode modulation of optical fiber that these gain medias are in the potential field that disappears of optical fiber, the Fiber quantum dot laser of the beam quality that the light intensity creating red emission is concentrated.Laser is 2.6mJ/cm at the pumping threshold of 532nm wavelength
2, spectrum and time domain impulse narrow after reaching laser threshold simultaneously.4.5 × 10
-7cm
3the laser pulse of 37W peak power, 3.6ns pulse duration, 0.13 μ J is created in the quantum dot of micro volume.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of quantum dot random fiber laser.
Fig. 2 is the scanning electron microscope diagram of quanta point optical fiber sample.
Fig. 3 is arrow indicating section enlarged drawing in Fig. 2.
Fig. 4 is along with the spectrum of increase along fiber axis to (exporting from fiber end face) of pumping light intensity develops.
Fig. 5 is the time domain waveform of pumping source and Fiber quantum point fluorescence/laser.
Fig. 6 exports the change of single pulse energy along with pumping light intensity.
Fig. 7 is the laser beam characteristic that high-speed camera (ICCD) is measured.
Embodiment
See Fig. 1, core of the present invention is the sample fiber (mark 2) of deposition quantum dot, and wherein the green glow pumping source (mark 1) of business maturation, nanometer adjusting bracket (mark 3) and convex lens (marking 4) are respectively as pumping source, adjusting means and collimated light beam device.
Mark 2 is the sample fiber of described deposition quantum dot, manufacture method is as follows: quantum dot adopts core, shell type quantum point (the Oceannanotech company of the U.S. of CdSe/ZnS material, emission wavelength is positioned at 630nm), the thickness of its nuclear diameter and shell is respectively 2.5nm and 2.6nm.Quantum dot is dissolved in toluene as solvent solution after ultrasonic wave dispersion, concentration is 165mg/ml.Then this peels coat off without nuclear optical fibre (Canadian INO company), inserts in the capillary of 320 microns.Individual three-dimensional adjustable shelf fixed capillary and optical fiber respectively, makes optical fiber accurately be positioned at the centre in the hole of capillary between two.Utilize capillarity easily will suck capillary afterwards, treat that toluene volatilizees, solid-state quantum film and cluster will stay the periphery of optical fiber.Through measuring, the thickness of this quantum dot film is about 244nm, compared to the quantum dot film thickness of individual layer 8nm, is approximately 30 layers.In addition, can be clear that the cluster of quantum dot from scanning electron microscopy, diameter is approximately hundreds of nanometer to several micron.Then cut flat polishing fiber end face with optical fiber cutter, the quanta point optical fiber sample that 3cm is long can be obtained.
Mark 1 is 532nm Nd:YAG frequency multiplication adjusting Q pulse laser source, and repetition rate 10Hz, the about 10ns of pulse duration, the single pulse energy continuously adjustabe of output, in the invention as pumping source.In order to obtain laser, single pulse energy is transferred to higher than 2.5mJ/cm
2.
Mark 3 is the three-dimensional fiber nanometer adjustment rack with optical fiber intermediate plate, by tuning XYZ axle, is got on this sample fiber by the light beam of pumping source.
Mark 4 is the lenticular lens of 50mm for convex lens are focal length, and place the end face 50mm place of distance optical fiber, the Random Laser of dispersing of output will be collimated.
In order to the installation of this laser is clearly described, mark A is the approach axis of pumping laser.Mark B is the outbound course of 644nm Random Laser after collimation.According to above explanation, by the random optical-fiber laser utilizing this invention to obtain quantum dot.
The present invention can deposit the sample fiber of 30 layers of quantum dot film and quantum dot cluster, and this sample is not only as the gain of laser, and simultaneously plural layers and cluster form laserresonator as the center of multiple scattering.The random pulses laser of 644nm is produced with the 532nm green glow Nd:YAG pulse laser profile pump of business maturation.
Described green-light source, quanta point optical fiber sample, convex lens are used separately as laser pumping source, gain/resonant cavity, and export collimation.Spot size is the sample fiber of 1cm × 350 μm green glow profile pump 3cm length, and the Random Laser of generation is exported by the end face of optical fiber.The feature of this Random Laser is pulse duration 3.6ns, and repetition rate 10Hz, peak power is up to 37W.
Described sample fiber is the optical fiber compatible type device built by CdSe/ZnS quanta point material being attached to fiber outer surface.
The present invention, by traditional accidental laser without fixing outbound course, poor zlasing mode, unstable multiline, by the waveguide of optical fiber, outputs and has stable output wavelength, the random fiber laser of the beam quality that light intensity is concentrated.
The scanning electron microscope diagram of quanta point optical fiber sample is see Fig. 2.Shown by Fig. 2, the end face without nuclear optical fibre of 125 μm of diameters, further the part that black arrow indicates is amplified.In Fig. 2, arrow indicating section enlarged drawing is see Fig. 3.As seen from Figure 3, quantum dot film maximum ga(u)ge is 244nm.Along with the spectrum of increase along fiber axis to (exporting from fiber end face) of pumping light intensity develops see Fig. 4.The time domain waveform of pumping source and Fiber quantum point fluorescence/laser is see Fig. 5.Wherein pump power is 14.1mJ/cm
2, this value is higher than pumping threshold, and wider pulse is pumping pulse, and narrower is output laser pulse.Export single pulse energy along with the change of pumping light intensity is see Fig. 6, exporting maximum single pulse energy is 134nJ, and corresponding pulse duration is 3.6ns, and can find out that the threshold value of laser is about ~ 2.5mJ/cm
2.The laser beam characteristic that high-speed camera (ICCD) is measured is see Fig. 7.
The present invention deposition ~ 30 layers of CdSe/ZnS quantum dot film and quantum dot cluster wrap up 125 μm of diameters without nuclear optical fibre, obtain the pulse random fiber laser of 644nm.This laser is 4.5 × 10
-7cm
3peak power 37W is created, the laser pulse of pulse duration 3.6ns in the quantum dot gain of micro volume.Compare without fixing outbound course, the beam quality of difference, the accidental laser of unstable multiline with traditional, the advantages such as the present invention has stable output wavelength, the beam quality that light intensity is concentrated, make it be applied to biomedical and photosystem integration field.
Claims (4)
1. quantum dot random fiber laser, is characterized in that the sample fiber, the convex lens that are provided with green-light source, deposition quantum dot;
The sample fiber of described green-light source profile pump deposition quantum dot, the laser beam convex lens that green-light source exports collimate, quantum dot adopts core, the shell type quantum point of CdSe/ZnS material, and the nuclear diameter of quantum dot is 2.5nm, and the thickness of the shell of quantum dot is 2.6nm.
2. quantum dot random fiber laser as claimed in claim 1, is characterized in that described green-light source adopts Nd:YAG times of frequency modulation Q wavelength at 530nm lasing light emitter, repetition rate 10Hz.
3. quantum dot random fiber laser as claimed in claim 1, is characterized in that the sample fiber of described deposition quantum dot adopts following methods preparation:
Be dissolved in by quantum dot in solvent toluene, obtain mixed solution, the concentration of mixed solution is 165mg/ml; Then peel optical fiber off coat, insert in the capillary of 320 μm; Be filled into by mixed solution in capillary, treat that toluene volatilizees, solid-state quantum dot will stay the periphery of optical fiber; Then cut flat fiber end face with optical fiber cutter, obtain the sample fiber of deposition quantum dot.
4. quantum dot random fiber laser as claimed in claim 1, is characterized in that described convex lens adopt focal length to be the lenticular lens of 50mm.
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| CN201510027435.XA CN104518417A (en) | 2015-01-20 | 2015-01-20 | Quantum dot random optical fiber laser device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242762A (en) * | 2018-03-08 | 2018-07-03 | 太原理工大学 | A kind of adjustable Random Laser chip based on two-sided PDMS folds |
| CN109586155A (en) * | 2018-12-07 | 2019-04-05 | 东南大学 | Based on mesoporous SiO2The accidental laser of spherical shell combination of inner and outside quantum dot film |
| CN110190510A (en) * | 2019-06-05 | 2019-08-30 | 上海大学 | A kind of optical resonator and preparation method thereof based on semiconductor-quantum-point self assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393299A (en) * | 2008-11-06 | 2009-03-25 | 中国计量学院 | Ultra-continuous wideband white light source of quanta point optical fiber |
| US20100020388A1 (en) * | 2005-11-08 | 2010-01-28 | Alcatel | Amplifying optical fiber |
-
2015
- 2015-01-20 CN CN201510027435.XA patent/CN104518417A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100020388A1 (en) * | 2005-11-08 | 2010-01-28 | Alcatel | Amplifying optical fiber |
| CN101393299A (en) * | 2008-11-06 | 2009-03-25 | 中国计量学院 | Ultra-continuous wideband white light source of quanta point optical fiber |
Non-Patent Citations (3)
| Title |
|---|
| CHENG CHENG AND XUEFENG PENG: "spectral characteristics of a quantum-dot(CdSe/ZnS)-doped fiber in low concentrations", 《OURNAL OF LIGHTWAVE TECHNOLOGY》 * |
| H. CHEN ET AL.: "Hybrid quantum dot/fiber lasers and optoplasmonic amplifiers", 《THE COLLOQUIUM ON PHYSICS OF QUANTUM ELECTRONICS》 * |
| 李其扬等: "CdSe/CdS/ZnS量子点光纤的增益研究", 《发光学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242762A (en) * | 2018-03-08 | 2018-07-03 | 太原理工大学 | A kind of adjustable Random Laser chip based on two-sided PDMS folds |
| CN109586155A (en) * | 2018-12-07 | 2019-04-05 | 东南大学 | Based on mesoporous SiO2The accidental laser of spherical shell combination of inner and outside quantum dot film |
| CN110190510A (en) * | 2019-06-05 | 2019-08-30 | 上海大学 | A kind of optical resonator and preparation method thereof based on semiconductor-quantum-point self assembly |
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