CN111934181B - Low-threshold organic Raman amplifier and application thereof - Google Patents
Low-threshold organic Raman amplifier and application thereof Download PDFInfo
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- CN111934181B CN111934181B CN202010714390.4A CN202010714390A CN111934181B CN 111934181 B CN111934181 B CN 111934181B CN 202010714390 A CN202010714390 A CN 202010714390A CN 111934181 B CN111934181 B CN 111934181B
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
- H01S3/094046—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser of a Raman fibre laser
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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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
Abstract
The invention discloses a low-threshold organic Raman amplifier and application thereof, belonging to the field of laser materials and application. The Raman signal amplification device comprises a pumping source and a Raman amplification unit, wherein an organic gain medium is used as a gain layer and a Raman amplification layer of the Raman amplification unit, the Raman signal is subjected to nonlinear amplification by utilizing the interaction between amplified spontaneous emission light and stimulated Raman scattering light of the organic gain medium, and meanwhile, the device has a wide and adjustable wavelength output window due to the wider gain spectrum of an organic gain material, so that the broadband flux output of the Raman signal can be effectively realized. The method has low cost and simple and quick preparation, and the preparation method of the solution processing can realize patterning preparation and free adjustment of the shape and the size. The device has excellent performance, high gain, wide band pass, low threshold, high signal-to-noise ratio and excellent optical stability, and can be applied to the technical fields of optical communication technology, biological imaging technology and material structure identification.
Description
Technical Field
The invention belongs to the technical field of laser materials and application, and particularly relates to a low-threshold organic Raman amplifier and application thereof.
Background
The raman effect is derived from molecular vibration and rotation, information of molecular vibration energy level and rotation energy level structures can be obtained from raman spectra, and the raman effect is commonly used for structure identification and molecular interaction analysis in the aspect of organic chemistry. Ordinary raman spectroscopy, while providing specific vibrational characteristics of chemical bonds, has low sensitivity. The method can realize extremely high sensitivity based on stimulated Raman scattering, has no background and high contrast of images, and is widely applied to biomedical imaging. In addition, a high-gain, broadband-pass and low-noise raman amplifier can improve transmission capacity and long-distance unrepeatered transmission, and is one of the key points of research in the field of communication at present. The currently commercially used raman amplifier is mainly based on glass fiber, which has good stability but extremely high pumping threshold, and this severely limits the application of raman in nonlinear optics and laser technology. In recent years, organic materials have shown important research value in the field of communication due to their wide luminescence spectrum and large raman shift, and therefore, it is necessary to develop a raman amplifier based on organic materials.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art and better meet the development of an optical communication technology and the application in the technical fields of biological imaging and material structure identification, the invention provides a low-threshold organic Raman amplifier with excellent comprehensive performance and application thereof. The device can simultaneously realize high gain, wide band pass, low threshold, high signal-to-noise ratio, excellent optical stability and low-cost manufacture.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a low-threshold organic Raman amplifier which comprises a pumping source and a Raman amplification unit. The pump source is the method used for conventional ASE characterization: the pump light has a spot area of 0.018cm 2 And a stripe of light of length 4mm, incident perpendicularly to the sample surface.
The Raman amplification unit comprises a gain layer, a Raman amplification layer and a substrate; the gain layer and the Raman amplification layer are the same layer of organic gain material deposited on the upper surface of the substrate, and the refractive index is larger than that of the substrate. The organic gain material selected by the invention has the functions of a gain layer and a Raman amplification layer, and the gain material is directly dispersed in an organic solvent and deposited on a substrate to prepare the gain film.
The organic gain material is micromolecule, star-shaped macromolecule, linear macromolecule, biological dye and fluorescent protein organic gain material or binary compound of the materials.
The substrate is a rigid transparent substrate or elastic plastic. The transparent rigid substrate is: quartz, glass. The elastic plastic is as follows: one of polyethylene terephthalate PET, polyimide PI, polyvinyl alcohol PVA, polymethylsiloxane PDMS, polyurethane acrylate PUA or hydrogel.
The gain layer and the Raman amplification layer are deposited in a spin coating mode, an ink-jet printing mode or a vacuum evaporation mode.
The pumping source is Nd 3+ YAG laserOne of a laser or a titanium sapphire laser.
Has the advantages that: compared with the prior art, the low-threshold organic Raman amplifier and the application thereof provided by the invention have the following advantages: the organic Raman amplification unit of the invention fully utilizes the wider gain spectrum and the higher gain value of the organic gain material to amplify the Raman signal, thereby obtaining the low-threshold organic Raman amplifier with excellent comprehensive performance. The interaction between the amplified spontaneous emission spectrum of the organic gain medium and the spectrum of the stimulated Raman scattering signal enables the output Raman signal to generate nonlinear amplification, and meanwhile, the wider gain spectrum enables the device to have a wider wavelength output window, so that broadband flux output can be effectively realized. In addition, the method has low cost and simple and quick preparation, and the preparation method of solution processing can realize patterning preparation and free adjustment of shape and size. In a word, the device has excellent performance, high gain, wide band pass, low threshold, high signal-to-noise ratio and excellent optical stability, and can be applied to the technical fields of optical communication technology, biological imaging technology and material structure identification.
Drawings
Fig. 1 is a graph of the output intensity and threshold of a low threshold organic raman amplifier.
FIG. 2 is a schematic diagram of the molecular structure of the organic gain medium SpL (2) -1 used in examples 1-3.
Fig. 3 is a wavelength tuning chart of stimulated raman scattering in example 1.
Detailed Description
The invention will be further described with reference to the following figures and examples.
Examples
The present invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the specific material ratios, process conditions and results thereof described in the examples are illustrative only and should not be taken as limiting the invention as detailed in the claims.
The invention provides a low-threshold organic Raman amplifier which comprises a pumping source and a Raman amplification unit.
The Raman amplification unit comprises a gain layer, a Raman amplification layer and a substrate; the gain layer and the Raman amplification layer are the same layer of organic gain material deposited on the upper surface of the substrate, the refractive index of the gain layer and the Raman amplification layer is larger than that of the substrate, and the gain layer is small molecule, star-shaped macromolecule, linear macromolecule, biological dye and fluorescent protein organic gain material or binary compound of the materials.
The substrate is a rigid transparent substrate or elastic plastic.
The transparent rigid substrate is: quartz, glass. The elastic plastic is as follows: one of polyethylene terephthalate (PET), Polyimide (PI), polyvinyl alcohol (PVA), polymethyl siloxane (PDMS), polyurethane acrylate (PUA) and hydrogel.
The gain layer and the Raman amplification layer are deposited in a spin coating mode, an ink-jet printing mode or a vacuum evaporation mode.
The pumping source is Nd 3+ YAG laser or titanium sapphire laser.
Example 1
Selecting a transparent quartz plate as a substrate, selecting linear macromolecular SpL (2) -1 (the structural formula is shown in figure 2) with high gain and low threshold as a gain medium, and dispersing the SpL (2) -1 in a toluene solution, wherein the concentration of the solution is 30 mg/mL; the preparation method of spin coating is adopted, and spin coating is carried out by using a spin coater with the set rotating speed of 2000rpm and the set acceleration of 1000 rpm. The mixture was placed on a heating table and annealed at 60 ℃ for 10 minutes. The prepared low-threshold organic Raman amplifier realizes the stimulated Raman scattering wavelength tuning from 468nm to 501nm (shown in figure 3), and obtains 29.6 mu J/cm 2 The ultra-low threshold (shown in fig. 1) is far lower than that of an inorganic raman amplifier, and is the lowest value in the prior report.
Example 2
Selecting polyethylene terephthalate (PET) as a substrate, selecting a spirofluorene ladder-shaped structure material SpL (2) -1 with high gain and low threshold as a gain medium, wherein the concentration of a solution is 30 mg/mL; the PET was placed on the print platform and heated to 55 ℃ with a control dot spacing of 10 μm and a line spacing of 10 μm, on which the gain layer was printed. The mixture was placed on a heating table and annealed at 60 ℃ for 30 minutes. A flexible organic raman amplifier that is bendable can be realized.
Example 3
Selecting Polymethylsiloxane (PDMS) as a substrate, selecting a micromolecular material poly [ 2-methoxy-5- (2-ethylhexyloxy) -1, 4-phenylacetylene ] (MEH-PPV) as a gain medium, wherein the concentration of the solution is 10 mg/ml; placing the PDMS substrate on a glass sheet, carrying out plasma treatment for 3 seconds, and carrying out spin coating by adopting a spin coating preparation method and setting a rotating speed of 2000rpm and an acceleration of 1000rpm by using a spin coater. The mixture was placed on a heating table and annealed at 60 ℃ for 10 minutes. A flexible organic raman amplifier that is bendable and stretchable can be realized.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (9)
1. A low-threshold organic Raman amplifier is characterized by comprising a pumping source and a Raman amplification unit, wherein the Raman amplification unit comprises a gain layer, a Raman amplification layer and a substrate; the gain layer and the Raman amplification layer are the same layer of organic gain material deposited on the upper surface of the substrate, and the refractive index is larger than that of the substrate;
the organic gain material has the functions of a gain layer and a Raman amplification layer at the same time;
the interaction between the amplified spontaneous emission spectrum of the organic gain medium and the spectrum of the stimulated Raman scattering signal enables the output Raman signal to generate nonlinear amplification;
the organic gain material is linear macromolecule SpL (2) -1 or micromolecule MEH-PPV;
when the organic gain material is linear macromolecule SpL (2) -1, the excitation wavelength is 440nm to 468 nm.
2. A low threshold organic raman amplifier according to claim 1, wherein said substrate is a rigid transparent substrate or a flexible plastic.
3. A low threshold organic raman amplifier according to claim 2, wherein said rigid transparent substrate is quartz or glass.
4. A low threshold organic raman amplifier according to claim 2, wherein said elastic plastic is: one of polyethylene terephthalate PET, polyimide PI, polyvinyl alcohol PVA, polymethyl siloxane PDMS, polyurethane acrylate PUA and hydrogel.
5. A low threshold organic raman amplifier according to claim 1, wherein said pump source is Nd 3+ YAG laser or titanium sapphire laser.
6. The method of any one of claims 1 to 5, wherein the organic gain material is dispersed in a toluene solution, and the gain thin film is deposited on the substrate; and then placing the substrate on a heating table, and annealing to obtain the low-threshold organic Raman amplifier.
7. The method of claim 6, wherein the concentration of the organic gain material in the toluene solution is 10-30 mg/mL.
8. The method of claim 6, wherein the organic gain material is deposited by one of spin coating, ink jet printing, or vacuum evaporation.
9. Use of a low threshold organic raman amplifier according to any one of claims 1 to 5 in the fields of optical communication technology, bioimaging technology and material structure identification technology.
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| CN1624992A (en) * | 2004-12-21 | 2005-06-08 | 中国科学院上海光学精密机械研究所 | Self-excited solid laman laser |
| CN101807774A (en) * | 2010-04-29 | 2010-08-18 | 天津大学 | Self-stimulated Raman scattering laser of In-Band pump |
| CN102244361A (en) * | 2011-05-26 | 2011-11-16 | 深圳大学 | Self-Raman frequency conversion self-mode locking solid laser |
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| US5448582A (en) * | 1994-03-18 | 1995-09-05 | Brown University Research Foundation | Optical sources having a strongly scattering gain medium providing laser-like action |
| US6623977B1 (en) * | 1999-11-05 | 2003-09-23 | Real-Time Analyzers, Inc. | Material for surface-enhanced Raman spectroscopy, and SER sensors and method for preparing same |
| CN1296766C (en) * | 2003-10-22 | 2007-01-24 | 四川大学 | Fluorescent dye reinforced Raman laser frequency-shift appartus and use |
| JP2005309295A (en) * | 2004-04-26 | 2005-11-04 | Nec Corp | Element, device, and system for optical amplification |
| CN107533270B (en) * | 2015-05-13 | 2022-04-26 | 古河电气工业株式会社 | Raman amplification light source, Raman amplification light source system, Raman amplifier, and Raman amplification system |
| CN108173115A (en) * | 2016-12-07 | 2018-06-15 | 中国科学院大连化学物理研究所 | A kind of tunable Ramar laser |
| CN107880872A (en) * | 2017-10-13 | 2018-04-06 | 中山大学 | A kind of surface-enhanced Raman fluorescent dual module nano-probe based on conjugated polymer and preparation method thereof |
| CN108767133B (en) * | 2018-06-18 | 2020-07-28 | 南京邮电大学 | Optical pump organic light emitting diode with high gain and manufacturing method thereof |
| CN108777431B (en) * | 2018-06-18 | 2020-07-03 | 南京邮电大学 | Method for realizing dual spontaneous emission amplification by using organic laser gain medium film |
| CN108808449B (en) * | 2018-06-22 | 2020-05-08 | 南京邮电大学 | Organic laser thin-film device based on triplet exciton amplifier and application |
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| CN1624992A (en) * | 2004-12-21 | 2005-06-08 | 中国科学院上海光学精密机械研究所 | Self-excited solid laman laser |
| CN101807774A (en) * | 2010-04-29 | 2010-08-18 | 天津大学 | Self-stimulated Raman scattering laser of In-Band pump |
| CN102244361A (en) * | 2011-05-26 | 2011-11-16 | 深圳大学 | Self-Raman frequency conversion self-mode locking solid laser |
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