CN109273985A - A kind of nanowire lasers and preparation method thereof - Google Patents
A kind of nanowire lasers and preparation method thereof Download PDFInfo
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- CN109273985A CN109273985A CN201811307705.2A CN201811307705A CN109273985A CN 109273985 A CN109273985 A CN 109273985A CN 201811307705 A CN201811307705 A CN 201811307705A CN 109273985 A CN109273985 A CN 109273985A
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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
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/1042—Optical microcavities, e.g. cavity dimensions comparable to the wavelength
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/083—Ring lasers
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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
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/1071—Ring-lasers
Abstract
The present invention provides a kind of nanowire lasers and preparation method thereof, belong to field of lasers.The present invention prepares quantum dot-doped polyvinylpyrrolidone nano wire using polyvinylpyrrolidone and cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot, it reuses micro- manipulation method and the quantum dot-doped polyvinylpyrrolidone nano wire is assembled into toroidal cavity resonator, irradiation excitation is carried out to the toroidal cavity resonator using laser.The present invention prepares polymer nano rice noodles using water-soluble quantum dot and polyvinylpyrrolidone (PVP), PVP is a kind of amphiphilic surfactant, quantum dot nano crystal can be made to be dispersed in water well, and it is just mutually compatible with water-soluble quantum dot, there is no the big deficiencies of oil-soluble quantum dot organic solvent toxicity；The present invention reduces the loss of quantum dot-doped polymer nanocomposite line optics conduction, overcomes the problem of ring resonator high threshold without complicated laser design technology and technology of preparing.
Description
Technical field
The present invention relates to field of laser device technology, in particular to a kind of nanowire lasers and preparation method thereof.
Background technique
Organic nano material causes the great interest of people in building nanoscale photonic device and circuit field, this is
Lasing, the outstanding performance of transmission and modulation light are carried out because it has with various structures.The optical property of One-dimensional organic nano-material
Polymer nano rice noodles completely different with the optical property of inorganic nano material, especially quantum dot-doped.Due to luminescence generated by light
High-efficient and stimulated radiation section is big, and the performance that nano-photon device can be improved in quantum dot-doped polymer nano rice noodles refers to
Mark.
Recently, the laser emitter research of polymer nano rice noodles sub-wavelength dimensions optical pumping makes important progress, wherein
Progress shows that polymer nano rice noodles can be assembled and manipulate into various structures.The optical pumping of these devices shows
Many advantages, such as: narrow line width, high Q value and low threshold value, so that it has pole in bio-imaging and optical sensing field
Big application.In the laser structure of various sub-wavelength dimensions optical pumping, knot resonator, micro-loop and loop resonator
It is more noticeable, because multi-mode resonance will be generated when the light path of resonator is equal to the integral multiple of resonant wavelength.
Although the toroidal cavity resonator that quantum dot-doped polymer nano rice noodles form has good emission characteristics and laser hair
Behavior is penetrated, but haves the shortcomings that threshold value is high, some toroidal cavity resonator threshold values are up to 2.6mJ/cm2；And gained quantum dot
The optic delivery loss of doped polymer nano wire is larger.
Summary of the invention
In view of this, it is an object of that present invention to provide a kind of nanowire lasers and preparation method thereof.The present invention uses poly-
Vinylpyrrolidone and cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot prepare quantum dot doped polymer nano wire, reuse the nanometer
Line is assembled into toroidal cavity resonator, and gained toroidal cavity resonator threshold value is low, and optical loss is low, realizes the preparation of low threshold laser.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
A kind of preparation method of nanowire lasers, comprising the following steps:
(1) ultrasound is carried out after mixing cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot aqueous solution and polyvinylpyrrolidonesolution solution
Processing, obtains mixed liquor；
(2) mixed liquor is lifted using czochralski method, obtains quantum dot-doped polyvinylpyrrolidone nano wire；
(3) the quantum dot-doped polyvinylpyrrolidone nano wire is assembled into annular resonance using micro- manipulation method
Device carries out irradiation excitation to the toroidal cavity resonator using laser, obtains nanowire lasers.
Preferably, the solvent of polyvinylpyrrolidonesolution solution includes water and/or alcohols solvent in the step (1)；It is described
Alcohols solvent includes one or more of methanol, ethyl alcohol, acetone and n-butanol.
Preferably, the concentration of polyvinylpyrrolidonesolution solution is 755~972mg/mL in the step (1).
Preferably, cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot aqueous solution concentration is 3~5 μm of ol/L in the step (1).
Preferably, polyvinylpyrrolidone and cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot mass ratio are in the mixed liquor
5~10:1.
Preferably, the power being ultrasonically treated in the step (1) is 900~1200W, and the time is 30~50min.
Preferably, the czochralski method in the step (2) specifically: by glass optical fiber bore immerse mixed liquor in 1~3 second, so
Afterwards with the speed lifting glass optical fiber cone of 0.1~2 meter per second.
Preferably, the diameter of quantum dot-doped polyvinylpyrrolidone nano wire is 200~800nm in the step (2),
Length is 50~1000 μm；
The quantum dot-doped concentration of the quantum dot-doped polyvinylpyrrolidone nano wire is 3200~3700 μm-3。
Preferably, the process for carrying out irradiation excitation to the toroidal cavity resonator using laser in the step (3) is specific
Are as follows: irradiation excites the annular resonance after beam of laser is focused on the hot spot that diameter is 50 microns by 100 times of microcobjective
Device；
The wavelength of the laser is 350~550nm.
The present invention provides the nano lasers of the preparation of preparation method described in above scheme.
The present invention provides a kind of preparation method of nanowire lasers, the present invention is by polyvinylpyrrolidonesolution solution and selenium
It is ultrasonically treated after cadmium-zinc sulphide core-shell structure copolymer quantum dot aqueous solution mixing, obtains mixed liquor, then prepared using czochralski method
Quantum dot-doped polyvinylpyrrolidone nano wire reuses micro- manipulation method for the quantum dot-doped polyvinylpyrrolidone
Nano wire is assembled into toroidal cavity resonator, carries out irradiation excitation to the toroidal cavity resonator using laser, obtains nanometer of the invention
Laser line generator.The present invention prepares polymer nano rice noodles using water-soluble quantum dot and polyvinylpyrrolidone (PVP), and PVP is one
Kind of amphiphilic surfactant, can be such that quantum dot nano crystal is dispersed in water well, and just with water-soluble quantum dot
Mutually compatible, there is no the big deficiencies of oil-soluble quantum dot organic solvent toxicity；The present invention uses cadmium selenide-zinc sulphide core-shell structure copolymer amount
Son point is used as Laser emission gain media；The present invention reduces quantum without complicated laser design technology and technology of preparing
The loss of point doped polymer nano wire optic delivery, overcomes the problem of ring resonator high threshold, in following nanometer light
Strong coherent source of diving will be served as in sub- device and circuit.Embodiment the result shows that, nanometer line laser provided by the invention
Device is able to carry out multi-mode laser transmitting, and threshold value is down to 100 μ J/cm2, optic delivery loss is only 60~80cm-1。
Detailed description of the invention
Fig. 1 is the TEM figure and EDS spectrum of quantum dot-doped polyvinylpyrrolidone nano wire prepared by the embodiment of the present invention 1；
Fig. 2 is the SEM figure of quantum dot-doped polyvinylpyrrolidone nano wire prepared by the embodiment of the present invention 1；
Fig. 3 is the device that the embodiment of the present invention 1 carries out optical characterisation to quantum dot-doped polyvinylpyrrolidone nano wire
Schematic diagram；
Fig. 4 be the embodiment of the present invention 1 prepare quantum dot-doped polymer nano rice noodles one end by local excition when it is dark
Field optical microscope picture；
Fig. 5 is the spectrogram of toroidal cavity resonator prepared by the embodiment of the present invention 1；
Fig. 6 is the SEM figure of toroidal cavity resonator prepared by the embodiment of the present invention 1.
Specific embodiment
The present invention provides a kind of preparation methods of nanowire lasers, comprising the following steps:
(1) ultrasound is carried out after mixing cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot aqueous solution and polyvinylpyrrolidonesolution solution
Processing, obtains mixed liquor；
(2) mixed liquor is lifted using czochralski method, obtains quantum dot-doped polyvinylpyrrolidone nano wire；
(3) the quantum dot-doped polyvinylpyrrolidone nano wire is assembled into annular resonance using micro- manipulation method
Device carries out irradiation excitation to the toroidal cavity resonator using laser, obtains nanowire lasers.
The present invention is by cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot (CdSe-ZnScore-shell quantum dot) aqueous solution and gathers
It is ultrasonically treated after the mixing of vinylpyrrolidone solution, obtains mixed liquor.In the present invention, the cadmium selenide-zinc sulphide core-
The concentration of shell quantum dot aqueous solution is preferably 3~5 μm of ol/L, more preferably 4 μm of ol/L；The cadmium selenide-zinc sulphide core-shell structure copolymer amount
The diameter of son point is preferably 4~6nm, more preferably 5nm；The present invention is to the cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot source
There is no particular/special requirement, uses commercially available cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot.
In the present invention, the solvent of the polyvinylpyrrolidonesolution solution preferably includes water and/or alcohols solvent；The alcohol
Class solvent preferably includes one or more of methanol, ethyl alcohol, acetone and n-butanol, more preferably ethyl alcohol；The polyethylene pyrrole
The concentration of pyrrolidone solution is preferably 755~972mg/mL, more preferably 850mg/mL.
After the present invention preferably mixes cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot aqueous solution and polyvinylpyrrolidonesolution solution
It is stirred, makes two kinds of solution after mixing, then be ultrasonically treated.In the present invention, the time of the stirring is preferably 2
~4h, more preferably 3h；The present invention does not have particular/special requirement to the revolving speed of the stirring, can be by cadmium selenide-zinc sulphide core-shell structure copolymer amount
Son point aqueous solution and the polyvinylpyrrolidonesolution solution are uniformly mixed.In the present invention, the time of the ultrasonic treatment
Preferably 30~50min, more preferably 40min, power are preferably 900~1200W, more preferably 1000W.
In the present invention, the cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot aqueous solution and polyvinylpyrrolidonesolution solution body
Product is than being preferably 340 μ L:0.8mL；Polyvinylpyrrolidone and cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot in the mixed liquor
Mass ratio is preferably 5~10:1, more preferably 6~8:1.
The present invention prepares polymer nano rice noodles using water-soluble quantum dot and polyvinylpyrrolidone (PVP), and PVP is a kind of
Amphiphilic surfactant can be such that quantum dot nano crystal is dispersed in water well, and just with water-soluble quantum dot phase
Compatible, there is no the big deficiencies of oil-soluble quantum dot organic solvent toxicity.
After obtaining mixed liquor, the present invention lifts the mixed liquor using czochralski method, obtains quantum dot-doped poly- second
Alkene pyrrolidone nano wire.In the present invention, the czochralski method specifically: glass optical fiber is bored and is immersed in mixed liquor 1~3 second,
Then with the speed lifting glass optical fiber cone of 0.1~2 meter per second.In the present invention, by after glass optical fiber cone lifting, solvent is rapid
Evaporation can form quantum dot-doped polyvinylpyrrolidone nano wire between glass optical fiber cone and mixed liquor.In the present invention
In, the pull rate of the glass optical fiber cone is preferably 0.5~1.5 meter per second, more preferably 1 meter per second.The present invention will lift speed
Degree control is within the above range, it is ensured that the quantum dot-doped polyvinylpyrrolidone nanowire surface of gained is smooth, reduces and passes
Lead loss.
In the present invention, the diameter of the quantum dot-doped polyvinylpyrrolidone nano wire is preferably 200~800nm,
More preferably 300~600nm, length are preferably 50~1000 μm, and more preferably 100~800 μm；The quantum dot-doped poly- second
The quantum dot-doped concentration of alkene pyrrolidone nano wire is preferably 3200~3700 μm-3, more preferably 3500 μm-3；The present invention will
The doping concentration control of quantum dot within the above range, can reduce the self-absorption loss of laser, while guarantee laser
Luminous efficiency.
After obtaining quantum dot-doped polyvinylpyrrolidone nano wire, the present invention uses micro- manipulation method by the quantum dot
Doping polyvinylpyrrolidone nano wire is assembled into toroidal cavity resonator, carries out irradiation to the toroidal cavity resonator using laser and swashs
Hair, obtains nanowire lasers.The present invention preferably under the microscope, by micro-nano adjusting bracket and micro-nano needle point to nano wire into
The three-dimensional of row physics such as pushes away, draws at the operation, and microscope is ined succession computer, can observe assembling situation in real time by computer monitor, directly
Until assembling required structure；The present invention does not have particular/special requirement to the concrete shape of the annular, as long as being capable of forming annular
?.
After assembling obtains toroidal cavity resonator, the present invention carries out irradiation excitation to the toroidal cavity resonator using laser.At this
In invention, the process of the irradiation excitation specifically: it is 50 microns that beam of laser, which is focused on diameter by 100 times of microcobjective,
Hot spot after irradiation excite the toroidal cavity resonator；The wavelength of the laser is preferably 350~550nm, more preferably 500nm.
The present invention provides the nano lasers of the preparation of preparation method described in above scheme.Nanometer laser provided by the invention
Device threshold value is low, is able to carry out multi-mode laser transmitting, and optic delivery loss is small, has broad application prospects.
A kind of nano laser provided by the invention and preparation method thereof is described in detail below with reference to embodiment,
But they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
(1) 680 milligrams of PVP are dissolved in 0.8 milliliter of dehydrated alcohol, obtain PVP ethanol solution.
(2) 340 microlitres of cadmium selenides-zinc sulphide core-shell structure copolymer quantum dot (5 nanometers of diameter), (4 micromole of concentration is every for aqueous solution
Rise) it is diluted into the PVP ethanol solution prepared, obtained mixed solution is stirred at room temperature 3 hours, then 40 points of ultrasonic treatment
Clock obtains the uniform mixed liquor for being suitble to draw nano wire.
(3) glass optical fiber is bored and is immersed in mixed liquor 3 seconds, then bored with the speed lifting glass optical fiber of 1 meter per second, with
The rapid evaporation of ethanol solution, a quantum dot-doped polymer nano rice noodles just are drawn out, gained quantum dot doped polymeric
The doping concentration of quantum dot is 3500 μm in object nano wire-3。
(4) by a diameter be 500 nanometers quantum dot-doped polymer nano rice noodles by micro- manipulation Technical form at
The SEM figure of one toroidal cavity resonator, gained toroidal cavity resonator is as shown in Figure 6.It is 550 nanometer lasers by 100 times by a branch of wavelength
Microcobjective to focus on diameter be that irradiation excites entire resonator after 50 microns of hot spot.
Gained quantum dot doped polymer nano wire is characterized:
(a) gained quantum dot doped polymer nano wire is observed using transmission electron microscope, gained TEM figure and
EDS spectrum is as shown in Figure 1；According to Fig. 1 as can be seen that quantum dot is entered inside polymer nanocomposite line by intact doping, and it polymerize
The diameter of object nano wire is 500 nanometers.
(b) gained quantum dot doped polymer nano wire is observed using scanning electron microscope, gained SEM schemes such as
Shown in Fig. 2；According to fig. 2 as can be seen that gained quantum dot doped polymer nanowire surface is smooth.
(c) as optical microscopy, the quantum dot doped polymer nano wire to obtained by carries out optical characterisation, and experimental provision is such as
Shown in Fig. 3.One wavelength is used as pumping for 550 nanometers of picosecond pulse lasers (10 kHz repetitive rates, 300 picoseconds of pulsewidths) and receives
The excitaton source of rice noodles；By 100 times of object lens (numerical aperture 0.65), pump light is focused onto the hot spot of 50 micron diameters；Light
The optical filter that photoluminescence signal successively passes through dichroscope after being collected by object lens and cutoff wavelength is 550 nanometers.By optical filter
Light spectrometer and CCD are individually directed to carry out the acquisition respectively of spectrum and image by beam splitter.
Optical characterisation is the results show that gained quantum dot doped polymer nano wire has absorption characteristic and photic hair to light
Light characteristic.
(d) the one of end for the laser that wavelength is 550 nanometers being focused on nano wire, utilizes microspectrophotometer
(CRAIC 20/20PV) acquires the emission spectrum along nanowire surface everywhere, probes into quantum dot-doped polymer nano rice noodles
Guide properties, dark field optical microscope picture when quantum dot-doped polymer nano rice noodles one end is by local excition are as shown in Figure 4.
Result of study shows that gained quantum dot doped polymer nano wire has guide properties, and optical signal can be compared with low-loss (70cm-1)
It is transmitted at a distance.
Toroidal cavity resonator is tested for the property:
(a) spectral characteristic of gained toroidal cavity resonator is tested, test condition is that room temperature irradiation focuses；Test result
9 spikes, i.e. multi-mode laser are generated in the range of as shown in figure 5, can be seen that in wavelength from 550 to 650 nanometer according to Fig. 5
Pattern count be 9, illustrate resonator of the invention can be realized multi-mode laser transmitting.
(b) threshold value of gained toroidal cavity resonator is tested using power adjustable laser pumping method method, as the result is shown institute
The threshold value for obtaining toroidal cavity resonator is 100 μ J/cm2。
It is tested using Q value (quality factor) of the spectral collection method to toroidal cavity resonator, gained annular is humorous as the result is shown
The Q value of vibration device can reach 400.
The above results show that the present invention can be realized the multi-mode laser transmitting of Low threshold, from the photic of toroidal cavity resonator
Luminous signal can be realized the preparation of low threshold laser.
Embodiment 2
Other conditions and embodiment 1 are identical, only quantum dot in quantum dot doped polymer nano wire obtained by rate-determining steps (3)
Doping concentration be 3300 μm-3。
Gained quantum dot doped polymer nano wire is characterized according to the method for embodiment 1, acquired results and implementation
Example 1 is similar, and optic delivery loss is only 65cm-1。
Gained toroidal cavity resonator device is tested for the property according to the method for embodiment 1, the threshold value of toroidal cavity resonator can be obtained
For 100 μ J/cm2, Q value is 380.
Embodiment 3
Other conditions and embodiment 1 are identical, and only the diameter of quantum dot doped polymer nano wire obtained by rate-determining steps (3) is
200nm。
Gained quantum dot doped polymer nano wire is characterized according to the method for embodiment 1, acquired results and implementation
Example 1 is similar, and optic delivery loss is only 80cm-1。
Gained toroidal cavity resonator is tested for the property according to the method for embodiment 1, the threshold value that can obtain toroidal cavity resonator is
100μJ/cm2, Q value is 450.
Embodiment 4
Other conditions and embodiment 1 are identical, and only the diameter of quantum dot doped polymer nano wire obtained by rate-determining steps (3) is
800nm。
Gained quantum dot doped polymer nano wire is characterized according to the method for embodiment 1, acquired results and implementation
Example 1 is similar, and optic delivery loss is only 60cm-1。
Gained toroidal cavity resonator is tested for the property according to the method for embodiment 1, the threshold value that can obtain toroidal cavity resonator is
100μJ/cm2, Q value is 420.
As can be seen from the above embodiments, preparation method provided by the invention is by cadmium selenide (CdSe)-zinc sulphide (ZnS)
The quantum dot-doped polyvinylpyrrolidone nano wire of core-shell structure copolymer is assembled into a toroidal cavity resonator, can be realized the more of Low threshold
Mould shines, and optic delivery loss is small, has broad application prospects.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of preparation method of nanowire lasers, comprising the following steps:
(1) it is carried out at ultrasound after mixing cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot aqueous solution and polyvinylpyrrolidonesolution solution
Reason, obtains mixed liquor；
(2) mixed liquor is lifted using czochralski method, obtains quantum dot-doped polyvinylpyrrolidone nano wire；
(3) the quantum dot-doped polyvinylpyrrolidone nano wire is assembled into toroidal cavity resonator using micro- manipulation method, made
Irradiation excitation is carried out to the toroidal cavity resonator with laser, obtains nanowire lasers.
2. preparation method according to claim 1, which is characterized in that polyvinylpyrrolidonesolution solution in the step (1)
Solvent include water and/or alcohols solvent；The alcohols solvent includes one of methanol, ethyl alcohol, acetone and n-butanol or several
Kind.
3. preparation method according to claim 1 or 2, which is characterized in that polyvinylpyrrolidone is molten in the step (1)
The concentration of liquid is 755~972mg/mL.
4. preparation method according to claim 1, which is characterized in that cadmium selenide-zinc sulphide core-shell structure copolymer in the step (1)
The concentration of quantum dot aqueous solution is 3~5 μm of ol/L.
5. preparation method according to claim 1 or 4, which is characterized in that in the mixed liquor polyvinylpyrrolidone and
Cadmium selenide-zinc sulphide core-shell structure copolymer quantum dot mass ratio is 5~10:1.
6. preparation method according to claim 1, which is characterized in that the power being ultrasonically treated in the step (1) is 900
~1200W, 30~50min of time.
7. preparation method according to claim 1, which is characterized in that the czochralski method in the step (2) specifically: by glass
Glass optical taper immerses in mixed liquor 1~3 second, then with the speed lifting glass optical fiber cone of 0.1~2 meter per second.
8. preparation method according to claim 1 or claim 7, which is characterized in that quantum dot-doped polyethylene in the step (2)
The diameter of pyrrolidones nano wire is 200~800nm, and length is 50~1000 μm；
The quantum dot-doped concentration of the quantum dot-doped polyvinylpyrrolidone nano wire is 3200~3700 μm-3。
9. preparation method according to claim 1, which is characterized in that use laser to the ring in the step (3)
Shape resonator carries out the process of irradiation excitation specifically: it is 50 micro- that beam of laser, which is focused on diameter by 100 times of microcobjective,
Irradiation excites the toroidal cavity resonator after the hot spot of rice；
The wavelength of the laser is 350~550nm.
10. the nano laser of the preparation of preparation method described in claim 1~9 any one.
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