CN103647208B - A kind of method of bimodal radiation wavelength in effective control particular dye random medium - Google Patents
A kind of method of bimodal radiation wavelength in effective control particular dye random medium Download PDFInfo
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- CN103647208B CN103647208B CN201310614164.9A CN201310614164A CN103647208B CN 103647208 B CN103647208 B CN 103647208B CN 201310614164 A CN201310614164 A CN 201310614164A CN 103647208 B CN103647208 B CN 103647208B
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Abstract
The present invention discloses a kind of method of bimodal radiation wavelength in effective control particular dye random medium.Comprise the following steps: first pass through the femtosecond laser pumping source of particular centre frequency to dielectric memory all long-life light wave modes carry out single-frequency pumping, obtain the particular space distribution of amplitudes corresponding to each smooth wave mode successively, secondly enveloping outer enclosure the normalization of extracting each distribution of amplitudes corresponding to space coordinates point obtain light wave spatial modulation function Fe (x), directly mate the light intensity transmitance of respective coordinates point in light modulator with this Light Modulation functional value, thus the effective control with outgoing wavelength is accurately modulated in the space realizing pump light.
Description
Technical field
The present invention relates to a kind of method of bimodal radiation wavelength in effective control particular dye random medium.This system belongs to
Random Laser field, is using rhodamine 6G methanol solution dyestuff and two kinds of materials of TiO2 nanometer scattering particles as random medium,
Femtosecond laser is as the pump light source of gain scattering random medium, and carrys out package space light wave tune with light wave modulation function Fe (x)
Spatial transmission rate g (x) of device processed realizes the space of pumping light intensity and accurately modulates, thus realizes effective control of outgoing wavelength.
Background technology
In recent decades, Chinese scholars had found the Random Laser radiation that intensity is higher in different medium, especially
Its phenomenon observed in ZnO quasiconductor random medium with H.Cao of Northwestern Univ USA et al. is as representative.They are with annular
Chamber and photon localization theory describe the characteristics of luminescence in random medium ideally, these characteristics and traditional laser instrument
Stimulated radiation significantly different.Random Laser radiation is under the excitation of pump light, and light wave is added into the height in gain material
Random closed-loop path is formed after density scattering material Multiple Scattering.
Subsequently, a lot of scientists including Lawandy are found that in mixed with the particular dye solution of scattering particles
Bimodal radiation phenomenon.More common a kind of theoretical explanation is that Vaveliuk " monomer dimer " is theoretical: bimodal radiation is
Due to two kinds of fluorescence aggregation monomers and dimeric existence, there is energy exchange between them, this process is mainly monomer
Upper energy level particle to a radiationless transition process of dimeric upper energy level.Whole bimodal radiative process can be split as two
The radiation field that group is associated, is added two radiation field intensities in time series, carries out Fourier transformation, can obtain bimodal radiation
Spectrogram.Owing to two main peaks are positioned near specific mid frequency, it is easier to distinguish, and for radiation main peak and its week
The burr small peak on limit is not easy to distinguish on the contrary.The present invention proposes bimodal radiation in a kind of effectively control particular dye random medium
Method, effectively can filter out main peak and filter small peak.
Summary of the invention
The invention provides a kind of method of bimodal radiation in effective control particular dye random medium.The method can be accurate
Really distinguish the main peak with bimodal radiation in the random medium of the rhodamine 6G mixed with nanometer scattering particles TiO2 and burr
Small peak, and efficiently control output wavelength.
Technical scheme is as follows:
Including femtosecond laser pumping source 1, spatial light modulator 2, gain scattering random medium 3.Wherein:
Femtosecond laser pumping source 1, as the pump light source of gain scattering random medium 3, is hung down by spatial light modulator 2
Directly incide on gain scattering random medium 3.Carry out spatial transmission rate g of package space light modulator 2 by the following method
(x): by the femtosecond laser pumping source 1 of particular centre frequency to each smooth wave mode K1, K2, K3, realize single-frequency pumping encourage,
It is distributed to the spatial amplitude corresponding to each smooth wave mode, as shown in Figure 5.Extract spatial amplitude distribution corresponding to each light wave mode
Enveloping outer enclosure, and normalization obtains Light Modulation function Fe (x), as shown in Figure 6.And with light wave modulation function Fe (x) come
Join spatial transmission rate g (x) of spatial light modulator 2 to realize the space of pumping light intensity and accurately modulate, thus effectively screen
Go out the radiation main peak in bimodal radiation phenomenon and burr small peak.Random medium layer is received by rhodamine 6G methanol solution dyestuff and TiO2
Two kinds of material compositions of Mie scattering granule, random medium produces bimodal radiation phenomenon, wherein comprises around two main peaks and main peak
Some small peaks.Gain scattering random medium 3 is alternately arranged by gain media layer and random medium layer；Wherein gain media layer
Dielectric constant is ε1, its thickness is stochastic variable；The dielectric constant of scattering medium layer is ε2, its thickness is constant.
Corresponding to bimodal radiation two described radiation transistion processes are not completely self-contained, there is energy between them
Exchange, this energy exchange, in addition to double absorption effect, also includes that the upper energy level particle of monomer is to dimeric upper energy level
A radiationless transition process.Write as follow-on level system so two kinds of level structures are combined, so that
The actual process realizing bimodal wavelength is more feasible, and wherein the pumping rate of monomer radiation transistion is set as fixed value, dimer spoke
The pumping rate penetrating transition is set as variable.
The beneficial effects of the present invention is: the inventive method can efficiently control the output wavelength of accidental laser, especially
It can filter out in accidental laser with mixed with bimodal spoke in the rhodamine 6G dyestuff random medium of nanometer scattering particles TiO2
The radiation main peak hit and burr small peak.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the present invention: 1. femtosecond laser pumping source, 2. spatial light modulator, 3. gain scattering
Random medium.
Fig. 2 is the schematic diagram of the modified model level system of random medium.
Fig. 3 is the spatial distribution schematic diagram of random medium internal electric field amplitude the most in the same time.
Fig. 4 is bimodal spectral radiance map in random medium.
Fig. 5 is the spatial amplitude scattergram that each smooth wave mode is corresponding.
Fig. 6 is normalization light wave modulation function Fe (x).
Fig. 7 is the output spectrum figure of random medium after modulation.
Detailed description of the invention:
The detailed description of the invention of system is described in detail by 1-7 below in conjunction with the accompanying drawings: the one in the present invention is effectively
Control the method for bimodal radiation wavelength in particular dye random medium, structural representation as it is shown in figure 1, include femto-second laser 1,
Spatial light modulator 2, gain scattering random medium 3.Gain scattering random medium (3) is by gain media layer and random medium layer
Alternately arranged；Wherein the dielectric constant of scattering medium layer is, thickness is constant s；The dielectric constant of gain media layer is ε1, thickness
For stochastic variable a, a=a0(1+Wr),a0=120nm, W are random strengths, and γ is in the stochastic variable of [-0.5,0.5].
As in figure 2 it is shown, left side correspondence dye monomer laser emission four-level system figure, right side correspondence dimer laser emission
Four-level system figure, so that the actual process realizing bimodal wavelength is more feasible, the wherein pumping rate of monomer radiation transistion
Wp1It is set as that fixed value, the pumping rate of dimer radiation transistion are set as variable Wp2.Two laser emission processes are mutually closed
, there is energy exchange in connection, this energy exchange, in addition to double absorption effect, also includes that the upper energy level particle of monomer is to dimerization
One radiationless transition process of the upper energy level of body.
Fig. 3 is the dynamic evolution process of quasi-morphotype in random medium.In 5 psec moment, quasi-state basically forms, in 10 psecs
In the moment, quasi-state is formed completely.The state that is as the criterion shown in Fig. 4 is the spectrogram of each smooth wave mode when being formed completely.
As it is shown in figure 5, the spatial amplitude scattergram of the light wave mode corresponding to each spatial point coordinate, owing to swashing random
Optical arena does not has traditional cavity resonator structure, and light wave is to form laser, further by the localization phenomenon of multiple scattering parameter
By the femtosecond laser pumping source (1) of particular centre frequency, each smooth wave mode K1, K2, K3 are realized single-frequency pumping to encourage, obtain
Spatial amplitude distribution corresponding to each smooth wave mode.
As shown in Figure 6, extract the enveloping outer enclosure of spatial amplitude distribution corresponding to each light wave mode, and normalization obtains light
Ripple modulation function Fe (x), and spatial transmission rate g (x) of package space light modulator 2 is carried out with light wave modulation function Fe (x)
The space realizing pumping light intensity is accurately modulated, thus effectively filters out the radiation main peak in bimodal radiation phenomenon and burr is little
Peak.
As it is shown in fig. 7, the spectrogram of each light wave mode for the output of this accidental laser, it it is the space through pump light
Accurately after modulation, select pumping laser pattern K1, the spectrogram of K2, K3 output, as seen from the figure, this accidental laser respectively
Effectively effectively can filter out main peak and filter small peak.
Claims (1)
1. the method for bimodal radiation in an effective control particular dye random medium, it is characterised in that: include femtosecond laser pump
Source, Pu (1), spatial light modulator (2), gain scattering random medium (3)；Gain in described gain scattering random medium (3)
Dielectric layer and random medium layer are alternately arranged；Wherein the dielectric constant of gain media layer is ε1, thickness is stochastic variable；Random Jie
The dielectric constant of matter layer is ε2, thickness is constant；And random medium layer is dissipated by rhodamine 6G methanol solution dyestuff and TiO2 nanometer
Penetrate two kinds of material compositions of granule；Comprise around two main peaks and main peak in bimodal radiation spectrum produced by random medium is little
Peak, the light wave mode that two main peaks are corresponding is designated as K1, K2, and the light wave mode that small peak is corresponding is designated as K3；Pass through particular centre frequency
Femtosecond laser pumping source (1) each smooth wave mode K1, K2, K3 are realized single-frequency pumping excitation, obtain corresponding to each smooth wave mode
Distribution of amplitudes, extract the enveloping outer enclosure of the distribution of spatial amplitude corresponding to each light wave mode, and normalization obtain Light Modulation
Function Fe (x), and carry out spatial transmission rate g (x) of package space light modulator (2) with light wave modulation function Fe (x) and realize
The space of pumping light intensity is accurately modulated, thus effectively filters out the radiation main peak in bimodal radiation phenomenon and burr small peak.
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| CN201310614164.9A CN103647208B (en) | 2013-11-28 | 2013-11-28 | A kind of method of bimodal radiation wavelength in effective control particular dye random medium |
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| CN201310614164.9A CN103647208B (en) | 2013-11-28 | 2013-11-28 | A kind of method of bimodal radiation wavelength in effective control particular dye random medium |
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| CN103647208A CN103647208A (en) | 2014-03-19 |
| CN103647208B true CN103647208B (en) | 2016-08-17 |
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| CN109959584B (en) * | 2019-04-01 | 2021-11-16 | 吉林大学 | Femtosecond laser pumping detection system and method for measuring soot particulate dynamics process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5287096A (en) * | 1989-02-27 | 1994-02-15 | Texas Instruments Incorporated | Variable luminosity display system |
| CN102545013A (en) * | 2012-02-16 | 2012-07-04 | 清华大学 | Laser gain device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006132285A1 (en) * | 2005-06-07 | 2006-12-14 | The Furukawa Electric Co., Ltd. | Light source |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5287096A (en) * | 1989-02-27 | 1994-02-15 | Texas Instruments Incorporated | Variable luminosity display system |
| CN102545013A (en) * | 2012-02-16 | 2012-07-04 | 清华大学 | Laser gain device and method |
Non-Patent Citations (3)
| Title |
|---|
| Model for bichromatic laser emisson from a laser dye with nanoparticle scatters;P.Vaveliuk et al.;《PHYSICAL REVIEW A》;20030703;第68卷;第013805-1页到第013805-9页 * |
| Theoretical investigation on temporal properties of random lasers pumped by femtosecond-lasing pulses;Jiantao Lv et al.;《Optics Communications》;20090601;第282卷(第11期);第2106页第2栏第3节，附图5 * |
| 二维随机介质中双波长辐射及模式竞争特性;樊婷等;《中国激光》;20130831;第40卷(第8期);第0806004-2页第1栏第4-13行，第2栏第4-30行，附图2 * |
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