CN105762634A - Flexible film random laser device adjustable in polarization degree and preparation method thereof - Google Patents
Flexible film random laser device adjustable in polarization degree and preparation method thereof Download PDFInfo
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- CN105762634A CN105762634A CN201610316126.9A CN201610316126A CN105762634A CN 105762634 A CN105762634 A CN 105762634A CN 201610316126 A CN201610316126 A CN 201610316126A CN 105762634 A CN105762634 A CN 105762634A
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
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Abstract
The invention discloses a flexible film random laser device adjustable in polarization degree and a preparation method thereof. The random laser device is of a film-shaped structure and is prepared from polyvinyl alcohol, polyalcohol and dye nematic-phase liquid crystal micro-droplets, wherein the polyalcohol and the dye nematic-phase liquid crystal micro-droplets are located in a film prepared from the polyvinyl alcohol. The flexible film random laser device changes orientation of nematic-phase liquid crystal molecules in the polyvinyl alcohol film and achieves random laser emergence adjustable in polarization degree by mechanically stretching the polyvinyl alcohol film containing the dye nematic-phase liquid crystal micro-droplets under the condition of laser pumping based on optical anisotropy of nematic-phase liquid crystal, and the random laser polarization direction is parallel to the stretching direction. The flexible film random laser device can achieve the functions of random laser wavelength stabilization and continuous and adjustable polarization degree, has the advantages of being low in cost, simple in structure, convenient to achieve and the like and has the better application value on the aspects of laboratory polarization calibration, system-level performance detection and the like of displays, sensors and polarizing optical remote sensors.
Description
Technical field
The present invention relates to Random Laser field, be specifically related to a kind of adjustable fexible film accidental laser of degree of polarization and preparation method thereof.
Background technology
In recent years, Random Laser has become as the popular research field of international laser educational circles.Random Laser radiation source self-activation Disordered Media, namely radiant light is provided bulk of optical feedback by the Multiple Scattering activated in Disordered Media, thus obtaining bigger gain, because of without extra resonance chamber.Gain medium is entrained in liquid crystal material and polymer by PDLC accidental laser, the refractive index between the refractive index in long axis of liquid crystal molecule direction and polymer is utilized not mate offer scattering, thus forming multiple feedback, form gain, outgoing Random Laser, there is volume little, it is easy to the feature such as integrated.
Polarized light source with medium interaction after the polarization information that can determine with the characteristic of himself of scattering light out, be different from generally measure obtain light intensity, spectrum, the information such as phase place, and the transmission that polarized light is in scattering medium is also regular governed.The available polarization technology of different polarization characteristic according to medium scatters and target reflecting light is got rid of the interference of KPT Scatter light and is improved the definition of image；Utilize polarization means the polarization parameter before and after biological tissue's pathological changes can being measured, contrasting, analyzing, thus providing a kind of new information analysis means to medical diagnosis；Polarized light is utilized to carry out liquid crystal display；Utilize the adjustment of polarized light source degree of polarization, can be used for the polarization calibration of the laboratory of polarization optics remote sensor and the detection of system-level performance；Utilize the relation between degree of polarization and tensile stress, can be used for the sensor of deformation monitoring.
But in Random Laser field, Random Laser can realize the outgoing of linear polarization Random Laser or the adjustment of Random Laser degree of polarization by following several ways.The article " Quasi-Two-DimensionalDiffusiveRandomLaserAction " that the DiederikS.Wiersma group of (1) 2004 year European non-linear laboratory delivers, realize liquid crystal molecule along direction of an electric field orientation by extra electric field, and realize the outgoing of linear polarization (e polarized light) light；The article " Emissionpolarizationofrandomlasersinorganicdyesolutions " that the SebastianKnitter group of (2) 2012 years Munster, Germany universities delivers, by mixed dye in glycerol and nanoparticle, and by line polarized light pumping, it is achieved the outgoing of linear polarization Random Laser；The article " Band-edgeandrandomlasinginpaintableliquidcrystalemulsion s " that the H.J.Coles group of (3) 2012 years univ cambridge uks delivers, adulterate cholesteric liquid crystal microdroplet in PVA film structure, cholesteric liquid crystal drip in liquid crystal molecule helically structural arrangement, this structure outgoing has the Random Laser of random polarization characteristic；The article " Polarizationandpolarizationcontrolofrandomlasersfromdye-dopednematicliquidcrystals " that the Yao Feng phoenix group of (4) 2013 years Harbin Institute of Technology delivers, pass through friction orientation, cause the orientation of liquid crystal molecule in liquid crystal cell, and according to the guest-host effect between dye molecule and liquid crystal molecule, it is achieved the outgoing of linear polarization Random Laser；nullThe article " Aplasmonicrandomlasertunablethroughstretchingsilvernanow iresembeddedinaflexiblesubstrate " that the Zhai Tianrui group of (5) 2015 years Beijing University of Technology delivers，By the PDMS solution containing nano silver wire and laser dye R6G is spin-coated in silicone rubber substrate，Form waveguiding structure，Utilize the surface plasma bulk effect of nano silver wire and the waveguiding effect of PDMS film structure，Realize the outgoing of random polarization Random Laser，And by stretching PDMS film，Force nano silver wire reorientation and fracture，Random Laser wavelength blue shift、Strength reduction，And realize polarization direction and be directed predominantly perpendicular to the Random Laser outgoing of draw direction，The polarization polarizability of Random Laser is converted to 1.51 (namely degree of polarization is converted to 0.20 by 0.02) from 1.04.
In prior art, the implementation of linear polarization Random Laser outgoing, as controlled by extra electric field, energy consumption is higher, and extra electric field reaches 120KV/cm；By the linear polarization Random Laser that friction orientation controls, the shortcomings such as its liquid crystal cell inner dye liquid crystal compound is liquid, has structure complexity, bad mechanical property；Being dripped by the cholesteric liquid crystal that adulterates in PVA film, outgoing Random Laser is random polarization, and foreseeable, due to the helical arrangement of liquid crystal molecule in liquid crystal drop, even if taking stretching mode, also cannot realize the adjustment of Random Laser degree of polarization；Being contained the nano-particle solution of dyestuff by line polarized light pumping, it is achieved linear polarization Random Laser outgoing, mobility is high, and structure is complicated, limits its application in display etc..By stretching the nano silver wire PDMS substrate containing dyestuff, utilize fracture and the reorientation of nano grain of silver line, it is achieved the adjustment of Random Laser degree of polarization, the degree of polarization adjustment from 0.02 to 0.20, its range of accommodation is little, and optical maser wavelength is unstable, strength reduction, structure is complicated, and preparation cost is high.
Summary of the invention
It is an object of the invention to provide a kind of adjustable fexible film accidental laser of degree of polarization and preparation method thereof, to solve when realizing linear polarization Random Laser of existence in prior art, energy consumption is high, structure is complicated, and when realizing the adjustable Random Laser of degree of polarization, degree of polarization range of accommodation is narrow, optical maser wavelength is unstable and the problem such as strength reduction, complicated process of preparation.
For achieving the above object, the technical solution used in the present invention is:
A kind of adjustable fexible film accidental laser of degree of polarization, it is membrane structure, being made up of polyvinyl alcohol, polyhydric alcohol, dyestuff nematic droplets, polyhydric alcohol and dyestuff nematic droplets are positioned at the thin film that polyvinyl alcohol is constituted, and the weight/mass percentage composition of each component is:
Polyvinyl alcohol: 30wt%～89.5wt%；
Polyhydric alcohol: 0.5wt%～10wt%；
Dyestuff nematic droplets: 10wt%～60wt%；
Wherein, dyestuff nematic droplets is made up of laser dye and nematic liquid crystal, and in dyestuff nematic droplets, the mass percent of laser dye is 0.1wt%～2wt%；
This fexible film accidental laser is using laser as pump light source, after pump light incides fexible film facet surface, it is perpendicular to fexible film facet surface outgoing Random Laser, the degree of polarization of Random Laser changes with the change of the tensile elongation of fexible film laser instrument, to realize Random Laser degree of polarization from the continuously adjustabe in 0 0.9 scopes, and the polarization direction of Random Laser is consistent with draw direction, wavelength stabilized laser.
Preferably, described dyestuff nematic droplets diameter is in 10nm～20um.
Preferably, described polyhydric alcohol is glycerol.It act as plasticizer, improves the flexibility of thin film accidental laser part.
Preferably, the thickness 10um～300um of described fexible film accidental laser.
Preferably, the angle between described pump light incident direction and fexible film facet surface normal is 0 °～30 °.
Preferably, the stretching mode that the stretching of described fexible film accidental laser is taked is simple tension or biaxial tension.
The preparation method of the adjustable fexible film accidental laser of a kind of degree of polarization, comprises the following steps:
A. laser dye and nematic liquid crystal mix homogeneously under ultrasound condition, forms dyestuff nematic liquid crystal mixed solution；
B. by dyestuff nematic liquid crystal mixed solution, polyhydric alcohol add polyvinyl alcohol aqueous solution in, heat and stir；
C. the polyvinyl alcohol water solution of mix homogeneously, polyhydric alcohol, dyestuff nematic liquid crystal solution, through supersound process, prepare into the emulsion containing dye liquid crystal microdroplet；
D. the emulsion containing dye liquid crystal microdroplet is carried out film forming process, evaporate moisture, obtain the polyvinyl alcohol film containing dye liquid crystal microdroplet.
Preferably, in described step b, heating-up temperature is 50 °, and mixing time is 1h.
Preferably, the emulsion containing dye liquid crystal microdroplet is carried out by described step d film forming process method is casting film method or film by wet method.
The operation principle of the present invention: pump light polarization direction is parallel to the draw direction of thin polymer film, before thin polymer film not being carried out stretched operation, nematic liquid crystal director is random orientation distribution in thin polymer film, and the refractivity between nematic liquid crystal and polymer is at no-npWith ne-npBetween random distribution, the Random Laser of outgoing is random polarization, and its degree of polarization is 0, comprises e polarized light and o polarized light.Wherein, noFor the ordinary index of refraction of liquid crystal, neFor the extraordinary refractive index of liquid crystal, npFor refractive index polymer.After thin polymer film stretched operation, nematic liquid crystal molecule, along draw direction orientation, is parallel on draw direction, and the refractivity between liquid crystal and thin polymer film is gradually increased as ne-np, and it being perpendicular to draw direction, the refractivity between liquid crystal and thin polymer film weakens gradually as no-np.Being accordingly parallel to draw direction, scattering strengthens, and causes that Random Laser component in the direction strengthens, and is perpendicular to draw direction, and scattering weakens, and causes that Random Laser component in the direction weakens.Random Laser degree of polarization is increased to 0.9 by 0 gradually along with the increase of draw ratio.
Beneficial effect:
Compared with prior art, the invention have the advantages that
(1) the fexible film accidental laser that prepared by the present invention program, its simple in construction, cost is low, and preparation technology is simple, is conducive to its integrated and large-scale production in Flexible Displays, sensor etc.；
(2) the present invention program realizes the control of Random Laser degree of polarization by stretching the mode of fexible film accidental laser, and the polarization direction of Random Laser is parallel with draw direction, and wavelength stabilized laser, and it is simple which has implementation, the advantage that energy consumption is little；
(3) present invention adopts nematic liquid crystal to prepare into dyestuff nematic droplets with laser dye, and nematic liquid crystal molecule is ambipolar arrangement in liquid crystal droplet.Under stretching condition, liquid crystal molecule tends to stretch out direction arrangement, it is easy to improves and forms refractivity between liquid crystal and polymer.
(4) polyvinyl alcohol is as emulsifying agent, disperses nematic liquid crystal, forms liquid crystal droplet；Polyhydric alcohol adopts glycerol, as plasticizer, improves the flexibility of Laser Devices.
(5) the present invention program can realize Random Laser degree of polarization from the continuously adjustabe in 0 0.9 scopes, has wider range of accommodation, is conducive to improving the precision of the laboratory polarization calibration of polarization optics remote sensor and the detection of system-level performance.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram；
The experimental result that Fig. 2 Random Laser degree of polarization increases with polyvinyl alcohol film draw ratio and changes.
In Fig. 1,1-polyvinyl alcohol, 2-polyhydric alcohol, 3-dyestuff nematic droplets, 4-pump light, 5-Random Laser, 6-draw direction.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
It is illustrated in figure 1 the adjustable fexible film accidental laser of a kind of degree of polarization of the present invention, it is membrane structure, it is made up of polyvinyl alcohol 1, polyhydric alcohol 2, dyestuff nematic droplets 3, polyhydric alcohol 2 and dyestuff nematic droplets 3 are positioned at the thin film that polyvinyl alcohol 1 is constituted, and the weight/mass percentage composition of each component is:
Polyvinyl alcohol: 30wt%～89.5wt%；
Polyhydric alcohol: 0.5wt%～10wt%；
Dyestuff nematic droplets: 10wt%～60wt%；
Wherein, dyestuff nematic droplets is made up of laser dye and nematic liquid crystal, and in dyestuff nematic droplets, the mass percent of laser dye is 0.1wt%～2wt%；
This fexible film accidental laser is using pump light as light source, after pump light 4 incides fexible film facet surface, it is perpendicular to fexible film facet surface outgoing Random Laser 5, the degree of polarization of Random Laser 5 changes with the change of the tensile elongation of fexible film laser instrument, to realize Random Laser degree of polarization from the continuously adjustabe in 0 0.9 scopes, and the polarization direction of Random Laser 5 is consistent with draw direction 6, wavelength stabilized laser.
Dyestuff nematic droplets diameter is in 10nm～20um.
Polyhydric alcohol is glycerol, it would however also be possible to employ other polyhydric alcohol, and it act as plasticizer, improves the flexibility of thin film accidental laser part.
Thickness 10um～the 300um of fexible film accidental laser.
Angle between pump light incident direction and fexible film facet surface normal is 0 °～30 °.
The stretching mode that the stretching of fexible film accidental laser is taked is simple tension or biaxial tension.
The preparation method of the adjustable fexible film accidental laser of above-mentioned degree of polarization, comprises the following steps:
A. laser dye and nematic liquid crystal mix homogeneously under ultrasound condition, forms dyestuff nematic liquid crystal mixed solution；
B. by dyestuff nematic liquid crystal mixed solution, polyhydric alcohol add polyvinyl alcohol aqueous solution in, heat and stir；
C. the polyvinyl alcohol water solution of mix homogeneously, polyhydric alcohol, dyestuff nematic liquid crystal solution, through supersound process, prepare into the emulsion containing dye liquid crystal microdroplet；
D. the emulsion containing dye liquid crystal microdroplet is carried out film forming process, evaporate moisture, obtain the polyvinyl alcohol film containing dye liquid crystal microdroplet.
In step b, heating-up temperature is 50 °, and mixing time is 1h.
Emulsion containing dye liquid crystal microdroplet is carried out by step d film forming process method is casting film method or film by wet method.
Below according to embodiment, the present invention will be further described, can be better understood from the present invention according to following example.But, concrete material proportion described by embodiment, process conditions and result thereof are merely to illustrate the present invention, and should without the present invention described in detail in restriction claims.
Embodiment 1
A kind of adjustable fexible film accidental laser of degree of polarization, wherein comprises polyvinyl alcohol (np=1.49), glycerol, laser dye PM597, nematic liquid crystal E7 (ne=1.75, no=1.52).Concrete preparation process is as follows:
(1) laser dye PM597 is ultrasonic with nematic liquid crystal E7 mixes, wherein laser dye PM597 accounting 1wt%；
(2) dye liquid crystal mixed solution, glycerol are added the aqueous solution containing 15wt% polyvinyl alcohol, be heated to 50 °, stir 1h, mix homogeneously；
(3) utilize ultrasonic cell disruption instrument (power 325W, frequency 20KHz, ultrasonic 2s, interval 3s, total time 3min), disperse dyes liquid crystal mixed liquor, prepare the viscous emulsion containing dye liquid crystal microdroplet；
(4) by crystalline emulsion by film by wet method on the glass substrate, form long 1cm, wide 0.5cm, the thin film of thickness 40um, thin film is peeled off from glass substrate, forms fexible film accidental laser, wherein polyvinyl alcohol accounting 58.7wt%, glycerol accounting 8.6wt%, dyestuff nematic droplets accounting 32.7wt%.
(5) 532nm (the frequency 10Hz produced with Nd:YAG laser instrument, pulsewidth 8ns) light source is as pump light, being that fexible film surface is incided at 15 ° of angles with film surface normal, the polarization direction of pump light is parallel with the long limit of fexible film laser instrument, all can observe Random Laser before and after film surface；
(6) along thin film long side direction, being stretched fexible film laser instrument restrained stretching length symmetrically and evenly by mechanical platform, it is achieved the adjustment of Random Laser degree of polarization, the degree of polarization range of accommodation of Random Laser is 0 0.82.The polarization direction of Random Laser is consistent with the draw direction of accidental laser, and optical maser wavelength is positioned at 578 ± 1nm.
(7), when fexible film is non-stretched, the degree of polarization of Random Laser is 0；When stretching 2 times, the degree of polarization of Random Laser is 0.31；When stretching 3 times, the degree of polarization of Random Laser is 0.55；When stretching 4 times, the degree of polarization of Random Laser is 0.75；When stretching 4.5 times, the degree of polarization of Random Laser is 0.81；When stretching 5 times, the degree of polarization of Random Laser is 0.82, the measurement result of its outgoing Random Laser degree of polarization as in figure 2 it is shown, in figure angle be the angle between optical axis and the draw direction of analyzer.
Embodiment 2
A kind of adjustable fexible film accidental laser of degree of polarization, wherein comprises polyvinyl alcohol (np=1.49), glycerol, laser dye PM597, nematic liquid crystal E7 (ne=1.75, no=1.52).Concrete preparation process is as follows:
(1) laser dye PM597 is ultrasonic with nematic liquid crystal E7 mixes, wherein laser dye PM597 accounting 0.1wt%；
(2) dye liquid crystal mixed solution, glycerol are added the aqueous solution containing 15wt% polyvinyl alcohol, be heated to 50 °, stir 1h, mix homogeneously；
(3) utilize ultrasonic cell disruption instrument (power 325W, frequency 20KHz, ultrasonic 2s, interval 3s, total time 3min), disperse dyes liquid crystal mixed liquor, prepare the viscous emulsion containing dye liquid crystal microdroplet；
(4) by crystalline emulsion by film by wet method on the glass substrate, form long 1cm, wide 0.5cm, the thin film of thickness 10um, thin film is peeled off from glass substrate, forms fexible film accidental laser, wherein polyvinyl alcohol accounting 89.5wt%, glycerol accounting 0.5wt%, dyestuff nematic droplets accounting 10wt%.
Embodiment 3
A kind of adjustable fexible film accidental laser of degree of polarization, wherein comprises polyvinyl alcohol (np=1.49), glycerol, laser dye PM597, nematic liquid crystal E7 (ne=1.75, no=1.52).Concrete preparation process is as follows:
(1) laser dye PM597 is ultrasonic with nematic liquid crystal E7 mixes, wherein laser dye PM597 accounting 2wt%；
(2) dye liquid crystal mixed solution, glycerol are added the aqueous solution containing 15wt% polyvinyl alcohol, be heated to 50 °, stir 1h, mix homogeneously；
(3) utilize ultrasonic cell disruption instrument (power 325W, frequency 20KHz, ultrasonic 2s, interval 3s, total time 3min), disperse dyes liquid crystal mixed liquor, prepare the viscous emulsion containing dye liquid crystal microdroplet；
(4) crystalline emulsion is obtained by casting film legal system the thin film of thickness 300um, thin film is peeled off from glass substrate, forms fexible film accidental laser, wherein polyvinyl alcohol accounting 30wt%, glycerol accounting 10wt%, dyestuff nematic droplets accounting 60wt%.
The above is only the preferred embodiment of the present invention; it is noted that, for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (9)
1. the adjustable fexible film accidental laser of degree of polarization, it is characterized in that: it is membrane structure, it is made up of polyvinyl alcohol, polyhydric alcohol, dyestuff nematic droplets, polyhydric alcohol and dyestuff nematic droplets are positioned at the thin film that polyvinyl alcohol is constituted, and the weight/mass percentage composition of each component is:
Polyvinyl alcohol: 30wt%～89.5wt%；
Polyhydric alcohol: 0.5wt%～10wt%；
Dyestuff nematic droplets: 10wt%～60wt%；
Wherein, dyestuff nematic droplets is made up of laser dye and nematic liquid crystal, and in dyestuff nematic droplets, the mass percent of laser dye is 0.1wt%～2wt%；
This fexible film accidental laser is using laser as pump light source, after pump light incides fexible film facet surface, it is perpendicular to fexible film facet surface outgoing Random Laser, the degree of polarization of Random Laser changes with the change of the tensile elongation of fexible film laser instrument, to realize Random Laser degree of polarization from the continuously adjustabe in 0 0.9 scopes, and the polarization direction of Random Laser is consistent with draw direction, wavelength stabilized laser.
2. the adjustable fexible film accidental laser of degree of polarization according to claim 1, it is characterised in that: described dyestuff nematic droplets diameter is in 10nm～20um.
3. the adjustable fexible film accidental laser of degree of polarization according to claim 1, it is characterised in that: described polyhydric alcohol is glycerol.
4. the adjustable fexible film accidental laser of degree of polarization according to claim 1, it is characterised in that: the thickness 10um～300um of described fexible film accidental laser.
5. the adjustable fexible film accidental laser of degree of polarization according to claim 1, it is characterised in that: the angle between described pump light incident direction and fexible film facet surface normal is 0 °～30 °.
6. the adjustable fexible film accidental laser of degree of polarization according to claim 1, it is characterised in that: the stretching mode that the stretching of described fexible film accidental laser is taked is simple tension or biaxial tension.
7. a preparation method for the adjustable fexible film accidental laser of degree of polarization as described in as arbitrary in claim 1-6, comprises the following steps:
A. laser dye and nematic liquid crystal mix homogeneously under ultrasound condition, forms dyestuff nematic liquid crystal mixed solution；
B. by dyestuff nematic liquid crystal mixed solution, polyhydric alcohol add polyvinyl alcohol aqueous solution in, heat and stir；
C. the polyvinyl alcohol water solution of mix homogeneously, polyhydric alcohol, dyestuff nematic liquid crystal solution, through supersound process, prepare into the emulsion containing dye liquid crystal microdroplet；
D. the emulsion containing dye liquid crystal microdroplet is carried out film forming process, evaporate moisture, obtain the polyvinyl alcohol film containing dye liquid crystal microdroplet.
8. the preparation method of the adjustable fexible film accidental laser of degree of polarization according to claim 7, comprises the following steps: in described step b, and heating-up temperature is 50 °, and mixing time is 1h.
9. the preparation method of the adjustable fexible film accidental laser of degree of polarization according to claim 7, comprises the following steps: the emulsion containing dye liquid crystal microdroplet is carried out by described step d film forming process method is casting film method or film by wet method.
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| CN106169693A (en) * | 2016-08-23 | 2016-11-30 | 东南大学 | A kind of dyestuff auto polymerization thin film accidental laser and preparation method thereof |
| CN109586156A (en) * | 2019-01-18 | 2019-04-05 | 东南大学 | Adjustable accidental laser of a kind of polarization repetition and preparation method thereof |
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| CN103825163A (en) * | 2014-03-04 | 2014-05-28 | 东南大学 | Device and method for emitting double-faced random lasers with different polarization directions |
| CN104538828A (en) * | 2014-12-29 | 2015-04-22 | 北京工业大学 | Solid random laser device for tuning wavelength through stretching method |
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| US20070091967A1 (en) * | 2005-10-06 | 2007-04-26 | Xiaoming Tao | Laser emitting material, method for making the same and use thereof |
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| CN103825163A (en) * | 2014-03-04 | 2014-05-28 | 东南大学 | Device and method for emitting double-faced random lasers with different polarization directions |
| CN104538828A (en) * | 2014-12-29 | 2015-04-22 | 北京工业大学 | Solid random laser device for tuning wavelength through stretching method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106169693A (en) * | 2016-08-23 | 2016-11-30 | 东南大学 | A kind of dyestuff auto polymerization thin film accidental laser and preparation method thereof |
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