CN117595069A - Laser antenna for optical code communication and application thereof - Google Patents
Laser antenna for optical code communication and application thereof Download PDFInfo
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Classifications
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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
-
- 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
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/36—Structure or shape of the active region; Materials used for the active region comprising organic materials
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5051—Laser transmitters using external modulation using a series, i.e. cascade, combination of modulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Lasers (AREA)
Abstract
The invention relates to a laser antenna for optical coding communication and application thereof, wherein the laser antenna comprises a cavity-containing microstructure laser gain material and a photo-curing matrix for wrapping the cavity-containing microstructure laser gain material, the cavity-containing microstructure laser gain material is a lead halide perovskite micron-level or submicron-level microstructure, and the cavity-containing microstructure laser gain material is uniformly dispersed in the photo-curing matrix and generates stimulated radiation phenomenon under pulse laser pumping. The light-cured matrix is an organic polymer and is used for maintaining the cavity-containing microstructure laser gain material. The laser antenna for optical coding communication and the application thereof, disclosed by the invention, are capable of transmitting information by using laser for the first time, and the characteristics of high brightness, strong directivity, good monochromaticity and strong coherence of the laser are maintained.
Description
Technical Field
The invention relates to the technical field of optical wireless communication, in particular to a laser antenna for optical coding communication and application thereof.
Background
In the field of communications, a radio frequency antenna is a communication device that can re-emit a modulated signal after receiving the modulated signal, and in optics, an optical device that re-emits an optical signal after receiving the optical signal is defined as an optical antenna.
Visible light communication, also called free space optical communication FSO, is a communication mode using free space as a transmission channel, wherein the technology of using laser for communication is a wireless laser communication technology, which has the advantages of high code rate, high bandwidth, flexibility and the like. The technology is mainly applied to the fields of aerospace and military national defense in early stage, but with the development of the technology, the technology is gradually applied to ground communication. Atmospheric laser communication is laser communication using the atmosphere as a transmission medium. Wireless laser communication can be classified into atmospheric laser communication, underwater laser communication, and the like according to the difference of free space channels. In addition, in order to meet the development and debugging requirements of the space multi-node laser communication system, researchers often realize the auto-collimation and high directivity of laser communication through a huge system of a lens group and a beam splitting component.
In deep space exploration, in order to further reduce the carrying resource requirement of communication load on the flight platform, researchers integrate microwave communication load and laser communication load into an integrated communication load, and realize mutual backup through flexible switching of the two communication frequency bands, so as to improve the reliability of a deep space communication link, improve the compatibility of a deep space communication system, improve the deep space communication quality and save deep space flight platform resources.
With the high-speed development of the fields of integrated circuits, quantum communication and the like, the micro-nano laser material attracts attention by virtue of small volume, low energy consumption, excellent optical performance and the like, has wide application prospect, and is expected to be applied in the future.
In the micro-nano laser material, the whispering gallery mode microcavity is used as a resonant cavity, the micro-nano laser material is used as a gain medium, and the requirement of laser generation is met under the excitation of a pumping source, so that the laser can be generated. The whispering gallery phenomenon is a phenomenon that, because electromagnetic waves are totally reflected when they propagate from an optically dense medium to an optically sparse medium, in a whispering gallery mode microcavity, continuous total reflection occurs when light propagates along the inner wall of the boundary of the geometric structure, and the light beam is confined on the annular boundary, thereby generating a phenomenon. Due to the advantages of small mode volume, ultrahigh Q value and low threshold, the micro-nano laser gain material containing the whispering gallery mode resonant cavity, namely the cavity-containing microstructure laser gain material, can realize single-mode laser with narrow pulse width and high quality factor under the condition of low threshold excitation.
The perovskite cavity-containing micro-structure material can generate laser with low threshold, high cavity quality factor, narrow pulse width and wide tunable visible light spectrum range under the excitation of pulse light through the whispering gallery mode micro-cavity. However, the effective application of the micro-nano laser material microstructure is difficult to realize in the prior art, and the micro-nano laser material with the micro-size can be observed, characterized and tested by a high-precision tip method in a laboratory, but the application is not realized in practical engineering.
The cavity-containing microstructure can be prepared by a simple chemical vapor deposition technology, the perfect smooth surface and the regular geometric structure ensure that the cavity-containing microstructure can form an ideal whispering gallery structure optical microcavity, low-threshold and narrow-bandwidth single-mode laser can be realized in a single microstructure, and the single-mode laser emission can be continuously tuned in the whole visible light range by modulating the size and the morphology of the halide component and the microstructure. However, the growth of the cavity-containing microstructure based on the research in the direction is prepared on the substrate, the cavity-containing microstructure is exposed in the environment, and the microstructure can be destroyed even fall off from the substrate under the action of a tiny force, so that the practical application and engineering are difficult.
The existing researches on cavity-containing microstructure laser gain materials and micro-nano lasers still have the following problems to be solved: the cavity-containing microstructure laser gain material has weak stability and weak applicability, and a micro-nano laser and a micro-laser light source which can be practically used are not available.
The existing cavity-containing microstructure material has weak stability, such as a micro-nano laser structure prepared by a solution method, such as a cesium-containing lead halide perovskite superlattice structure, and the like, and the structure is destroyed after being kept at room temperature for several days, such as a cavity-containing microstructure grown by a chemical vapor deposition technology is stable on a substrate, but is easily scratched and destroyed.
The existing micro-nano laser field is developed rapidly, and most of the fields are focused on future integrated optical paths, quantum communication, micro-nano laser devices and other future applications, so that the applicability is weak. Micro-nano structures and materials are mainly studied around laboratories, but few are implemented in the prior art.
With the development of laser technology, intensive research is carried out on a stable micro-nano single-mode laser, and a micro-nano material cavity-containing microstructure can realize single-mode laser output under the micron-level or submicron-level size, but the integration is difficult to realize due to the tiny material.
With the development of integrated optical circuits, micro-nano level laser light sources have wider application space, and cavity-containing microstructures prepared by the traditional technology are difficult to transfer to integrated optical circuits/circuit boards, so that the stability is poor and the practicability is weak.
Disclosure of Invention
A first object of the present invention is to provide a laser antenna for optical coded communication, which aims at the problems in the prior art.
For this purpose, the above object of the present invention is achieved by the following technical solutions:
a laser antenna for optical coded communications, characterized by: the laser antenna comprises a cavity-containing microstructure laser gain material and a light-cured matrix wrapping the cavity-containing microstructure laser gain material, wherein the cavity-containing microstructure laser gain material is a micron-level or submicron-level laser gain material containing whispering gallery mode resonant cavities, the cavity-containing microstructure laser gain material is uniformly dispersed in the light-cured matrix, a stimulated radiation phenomenon is generated under pulse laser pumping, single-mode laser is emitted, and the light-cured matrix is an organic polymer and is used for keeping the cavity-containing microstructure laser gain material.
The invention can also adopt or combine the following technical proposal when adopting the technical proposal:
as a preferable technical scheme of the invention: the cavity-containing microstructure laser gain material is selected from lead halide perovskite microstructure, II-VI group compound microstructure, III-V group compound microstructure, silicon microstructure, organic material microstructure, zinc oxide microstructure or diamond mesoporous microstructure.
As a preferable technical scheme of the invention: the cavity-containing microstructure laser gain material adopts a cesium-containing lead halide perovskite micro-level or submicron micro-level microstructure.
As a preferable technical scheme of the invention: the cavity-containing microstructure laser gain material is in a submicron-level sphere or ellipsoid shape with the diameter of 0.4-1 micron or in a micron-level rod-like or cube shape with the diameter of 1-10 microns, and the cavity-containing microstructure laser gain material is in a submicron-level rod-like or cube-like shape with the size of 0.4-1 micron or in a micron-level rod-like or cube-like shape with the size of 1-10 microns.
As a preferable technical scheme of the invention: the cavity-containing microstructure laser gain material does not generate aggregation in the photo-curing matrix, and each 1000 mu m of the light source contains 1-1000 cavity-containing microstructure laser gain materials.
As a preferable technical scheme of the invention: the light-cured matrix is obtained by a polybutylene terephthalate curing method, a polylauryl methacrylate curing method, a polyvinyl fluoride curing method, a polymethyl methacrylate curing method or a polyurethane acrylic ester curing method.
As a preferable technical scheme of the invention: the photocuring matrix is prepared by a polylauryl methacrylate curing method, an organic polymer is formed by a photoinitiator, a photocuring resin and a cross-linking agent, wherein the photoinitiator is (2, 4, 6-trimethylbenzoyl) diphenyl phosphine oxide, the photocuring resin is polylauryl methacrylate, the cross-linking agent is glycol secondary acrylate, and the weight ratio of the cross-linking agent to the glycol secondary acrylate is 0.03-0.07: 20: and 5, mixing and stirring the photoinitiator, the photo-curing resin and the cross-linking agent to obtain a solution-type photo-curing matrix, and forming a solid with stable property under ultraviolet irradiation.
As a preferable technical scheme of the invention: the solution-state light-cured matrix can be cured into a solid structure after being excited by light in the wave band of 300-600 nm.
A second object of the present invention is to provide an application of a laser antenna for optical coded communication, which addresses the problems of the prior art.
For this purpose, the above object of the present invention is achieved by the following technical solutions:
an application of a laser antenna for optical coded communication, characterized in that: the laser antenna is characterized in that the pulse light amplitude is adjusted to carry out optical coding design of 1 and 0 above and below the cavity-containing microstructure laser gain material threshold value in the laser antenna, and stable optical coding communication is realized by taking the cavity-containing microstructure laser gain material stimulated radiation laser threshold value as a coding basis, so that the laser antenna is applied to multiple-input multiple-output serial communication coding.
Compared with the prior art, the invention has the following beneficial effects:
the laser antenna for optical coding communication and the application thereof realize the laser antenna capable of transmitting information by using laser for the first time, keep the characteristics of high brightness, strong directivity, good monochromaticity and strong coherence of the laser, and can be used for optical coding communication.
According to the laser antenna for optical coding communication, the cavity-containing microstructure laser gain material is coated in the organic matrix, so that the cavity-containing microstructure laser gain material is prevented from reacting with the photo-curing matrix, damage of the photo-curing matrix to the cavity-containing microstructure laser gain material is avoided, and meanwhile, the cavity-containing microstructure laser gain material can generate laser under the excitation of pulse laser and reflect the intensity of high-frequency pulse laser in real time; under the excitation of pulse light, the whispering gallery mode laser can be realized, the laser can be emitted when the power reaches a threshold value, and the cavity-containing microstructure laser gain material emits fluorescence when the power is lower than the threshold value.
The laser antenna for optical coding communication and the application thereof solve the problems of weak stability and weak applicability of a micro-nano laser structure, and the cavity-containing micro-structure micro-nano laser gain material prepared by the traditional technology is solidified and packaged, so that the use stability and applicability of the cavity-containing micro-structure micro-nano laser gain material are improved under the condition that the efficiency of stimulated radiation laser phenomenon is ensured under the condition of laser pumping. The laser antenna device can effectively realize the transmission of signals with different frequencies through the excitation of pulse lasers with different frequencies, can generate laser carrying signals under the excitation of high-frequency pulse lasers carrying signals, carries out high-efficiency information transmission, has strong dependence on initial signals, has low signal output error rate, stable performance and excellent communication transmission property, and has wide application prospect in the aspect of laser coding communication.
Drawings
FIG. 1 is a single-mode laser output plot of a laser antenna for optical coded communications in accordance with the present invention, demonstrating the micronano-laser characteristics of the applied cavity-containing microstructured laser gain material;
FIG. 2 is a diagram showing the output laser of a laser antenna for optical code communication according to the present invention under laser pumping;
FIG. 3 is a physical pattern example of a laser antenna for optical code communication according to the present invention;
FIG. 4 is a schematic diagram of a laser antenna for optically encoded communications of the present invention lasing;
FIG. 5 is a schematic diagram of a laser antenna for optical coded communications according to the present invention;
fig. 6 is a data diagram of a laser antenna for optical code communication according to the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and specific embodiments.
The invention provides a device capable of realizing laser signal receiving and transmitting based on research and application of a micro-nano laser gain material with a cavity microstructure and a fluorescent antenna device, overcomes the defect of weak application of the existing micro-nano laser material research, realizes a stable and efficient micro-nano laser device design, effectively realizes laser coding communication through the device, can be applied to multiple-input multiple-output serial communication coding, and effectively improves the laser coding communication rate.
A laser antenna for optically encoded communications, the laser antenna comprising a cavity-containing microstructured laser gain material and a photocurable matrix surrounding the cavity-containing microstructured laser gain material. The cavity-containing microstructure laser gain materials are uniformly dispersed in the light-cured matrix, the aggregation phenomenon of the cavity-containing microstructure laser gain materials in the light-cured matrix is avoided, and 1-1000 cavity-containing microstructure laser gain materials are arranged in every 1000 cubic micrometers on average. The cavity-containing microstructure laser gain material comprises a cesium-containing lead halide perovskite micro-or submicron-level microstructure, stimulated radiation phenomenon is generated under pulse laser pumping, and the photocuring matrix is an organic polymer and is used for maintaining the performance of the cesium-containing lead halide perovskite micro-or submicron-level microstructure.
The laser antenna for optical coding communication contains uniformly dispersed and non-agglomerated lead halide perovskite micro-or sub-micron microstructures, and can generate stimulated radiation laser under laser pumping. When the pumping intensity is lower than the stimulated emission laser threshold value, the lead halide perovskite micro-structure or submicron micro-structure presents a fluorescence state with weak intensity, and when the pumping intensity is higher than the stimulated emission laser threshold value, the lead halide perovskite micro-structure or submicron micro-structure presents a laser state with high intensity. The laser threshold of stimulated radiation is used as an optical coding basis, when the laser threshold is lower than the threshold, the pump light acts on the microstructure to generate weak fluorescence, and when the laser threshold is higher than the threshold, the pump light acts on the microstructure to generate strong laser, and the pump light acts on the microstructure to generate weak fluorescence, so that the pump light acts as '0' in optical coding communication. As shown in fig. 5, the laser with digital signal floats above and below the threshold of the microstructure in the laser antenna, excites the laser antenna, outputs a stable and clean digital signal output laser, is collected by a detector and displayed on an oscilloscope.
The cesium-containing lead halide cavity-containing microstructure laser gain material has the advantages of simplicity, high efficiency, high yield, low cost and manual controllability, can effectively solve the defects of difficult preparation, harsh preparation conditions, insufficient sample stability and the like in the preparation process of the micro-nano material, and reduces the manufacturing cost of devices.
According to the invention, the Cavity-containing microstructure laser gain material containing cesium lead halide perovskite is selected, and through the Cavity-containing microstructure laser gain material with different sizes, different structures and different halogen ratios, the wide tunable generation of visible light full-band single-mode or multi-mode low-threshold narrow-bandwidth laser can be realized, the applicability is strong, the preparation condition is simple, the condition difficulty of preparing and using a micro-nano laser device is effectively reduced, the optical performance of the Cavity-containing microstructure laser gain material can be stably maintained for a long time, the wavelength of the full spectrum band of visible light is covered, the laser antenna can receive laser signals from the front side or the side under the pulse laser excitation state, the laser coding communication transmission can be efficiently realized, and the Cavity-containing microstructure laser gain material has a great application prospect in the fields of integrated optical circuits, wireless optical communication and the like.
The cesium-containing lead halide perovskite microstructure micro-nano laser gain material is simple to prepare, has controllable performance and can be widely tuned in the whole visible light band. The cavity-containing microstructure laser gain material can realize single-mode laser with narrow pulse width and high cavity quality factor under the action of high-efficiency pulse laser pumping. By combining the preparation thought of the fluorescent antenna and combining the cavity-containing microstructure laser gain material with the photo-curing matrix, a stable laser antenna is formed, the defects of the micro-nano laser material in storage, transfer and application can be effectively overcome, the characteristic of weak stability of the traditional micro-nano laser material device is improved, and the manufacturing cost of the micro-nano laser device is reduced.
The specific technical scheme of the invention is as follows:
a laser antenna for optical coding communication is composed of a cavity-contained microstructure, laser gain material and the photo-solidifying matrix of wrapping material. The cavity-containing microstructure laser gain material is a cesium-containing lead halide perovskite micron-level or submicron-level microstructure, and can generate stimulated radiation phenomenon under pulse laser pumping. The light-cured matrix is an organic polymer and comprises a photoinitiator TPO, light-cured resin LMA and a cross-linking agent EDGM.
The growth preparation of different microstructures is realized by regulating and controlling factors such as growth temperature, growth environment, air flow speed and the like through a chemical vapor deposition technology, and then the growth preparation of the laser antenna is realized by stripping the substrate and dispersing the substrate in a photo-curing matrix. The prepared laser antenna has stable performance, can realize efficient stimulated radiation phenomenon in room temperature environment, and has weaker damage to the cavity-containing microstructure laser gain material in the preparation process.
Through laser signal modulation and optical communication coding technology, the communication performance test is carried out on the laser antenna by combining the communication test platform, so that the laser antenna is verified to be capable of effectively realizing laser coding communication, and the multi-input multi-output efficient communication is expected to be realized.
The invention relates to a laser antenna, in particular to a stable optical device capable of realizing stimulated radiation laser output under laser pumping, which can be used for optical communication or micro-nano laser design and the like.
In the laser antenna for optical coding communication, the cavity-containing microstructure laser gain material is preferably perovskite cavity-containing microstructure, and the photo-curing matrix coating the cavity-containing microstructure laser gain material refers to an organic polymer formed by a photoinitiator (2, 4, 6-trimethylbenzoyl) diphenyl phosphine oxide (hereinafter referred to as TPO), photo-curing resin (hereinafter referred to as PLMA) and a crosslinking agent (hereinafter referred to as EDGM).
In the invention, the cavity-containing microstructure laser gain material adopts the perovskite cavity-containing microstructure, and in the existing micro-nano laser gain material, the perovskite cavity-containing microstructure is easy to prepare, and can be easily prepared only by a chemical vapor deposition technology or an antisolvent method; the perovskite cavity-containing microstructure has good micro-nano laser characteristics, and the structures such as a micro-nanowire, a microsphere, a microcube and the like prepared by using lead halide perovskite can generate single-mode laser with narrow linewidth, high cavity quality factor and low threshold under laser pumping, and meanwhile, the wide tunability of the visible light spectrum range can be realized by changing halogen; the perovskite cavity-containing microstructure has stable properties, can maintain the morphology for a long time under the condition of no external interference, but is easy to damage under the action of tiny force.
In the invention, the photo-curing matrix coated with the micro-nano laser gain material adopts an organic polymer of LMA-EDGM-TPO, and the LMA-EDGM-TPO organic polymer does not react with the perovskite cavity-containing microstructure laser gain material, and can form a stable body structure. Experiments are compared with the conditions of the laser antenna under the condition that polymethyl methacrylate (PMMA) material and LMA material are used as curing resin, and experiments show that the laser antenna prepared by taking the PMMA material as the curing matrix is difficult to mold and has poor coating effect, and the LMA material forms a stable block under the irradiation of ultraviolet light and has good coating effect. EDGM is added as a cross-linking agent, so that the curing efficiency is enhanced while the LMA material is prevented from reacting with the perovskite material. By adding TPO as a photoinitiator, the molding rate and stability of the structure of the cured body can be effectively improved, and along with the rising of the concentration of TPO in a photo-curing solution, the shorter the time required by the structure of the cured body is, the faster the molding speed is, but the too high concentration of TPO can cause uneven internal stress of the prepared optical antenna to generate cracks. The mass fraction ratio of the LMA solution, the EDGM solution and the TPO solution is adjusted to be 20:5: and (3) mixing and stirring 0.03-0.07 to obtain a solution-type photo-curing matrix, wherein the solution-type photo-curing matrix can be cured into an optical antenna with a bulk structure after being excited by light in a wave band of 300-600 nm for 6-10 min.
FIG. 1 is a schematic illustration of a Cavity microstructure laser gain Material-CsPbBr of a lead halide perovskite containing cesium used in the present invention 3 Single mode laser output map of the microsphere. CsPbBr of 0.5-3 microns size 3 The microsphere can realize the excitation of the laser with the wave band of about 540nm under the ultra-fast laser pumping. Due to the whispering gallery effect, the output laser wavelength is related to the size of the microsphere microcavity, and the output micro-nano laser can be finely regulated and controlled by regulating and selecting the size of the microsphere. The prepared perovskite micro-nano laser gain material has obvious stimulated radiation phenomenon, as shown in figure 1, realizes the stimulated radiation phenomenon of the dependence of the power of the excitation laser, and has the advantages of narrow output laser pulse and high microcavity quality factor. FIG. 1 demonstrates the applicationThe micro-nano laser characteristic of the cavity-containing microstructure laser gain material.
FIGS. 2 and 3 show that the perovskite micro-nano laser gain material is CsPbBr based on a LMA, EDGM, TPO composition photo-curing matrix 3 And a single-mode laser output graph and a laser antenna graph which are manufactured by the microspheres. The laser antenna prepared by the scheme of the invention can obtain stable single-mode laser output by using ultra-fast laser pumping, and the used laser antenna is a cuboid-shaped laser antenna with the thickness of 1mm. Under the irradiation of ultraviolet light, the laser antenna is light green. Fig. 2 illustrates the output laser condition of the prepared laser antenna under the laser pumping, and fig. 3 illustrates a sample pattern of the prepared laser antenna.
Fig. 4 is a conceptual diagram of a laser antenna according to the present invention. The laser antenna in the conceptual diagram is based on a light-cured matrix composed of LMA, EDGM, TPO, and the perovskite micro-nano laser gain material is CsPbBr 3 And (3) manufacturing microspheres. Under the excitation of 405nm ultrafast laser, we can collect laser with narrow pulse width from the front and the side.
Fig. 5 is a schematic diagram of a laser antenna communication test according to the present invention. By modulating the laser signal, the high-precision, stable and efficient laser coding communication is realized. The laser gain material threshold of the cavity-containing microstructure in the laser antenna is adjusted up and down by adjusting and controlling the laser signal, so that whether an output signal exists or not can be effectively realized. The signals are defined as a 0 signal and a 1 signal, and the output signals are demodulated and reproduced to finish the reading of the signals. Compared with the traditional laser communication, the communication mode directly controls whether laser exists as a 0 signal and a 1 signal, so that the energy loss during laser switching and energy adjustment is greatly reduced, the energy is saved, the environment is protected, and meanwhile, the efficient transmission rate can be ensured.
Fig. 6 is a diagram of laser antenna communication test data according to the present invention, and optical code communication based on a laser antenna is performed by using OOK code communication method. By modulating the laser signal, according to the test principle described in fig. 5, an actual sampling signal of a red dotted line part shown in fig. 6 is obtained, and an output signal of a green solid line part shown in fig. 6 is obtained through simple extraction and processing, so that signal transmission stability is demonstrated compared with the original signal. Therefore, the laser antenna for optical coding communication can effectively reduce the influence of background noise in the optical coding communication, improves the communication speed and accuracy, and has great application prospects in the fields of indoor high-speed wireless optical communication, deep space laser communication, underwater optical communication, optical flexible sensors, optical calculation and the Internet of things.
Example 1
This example illustrates how a photo-cured matrix based on LMA, EDGM, TPO composition was prepared with a perovskite micro nano laser gain material of CsPbBr 3 And the laser antenna of the microsphere is used for realizing laser output. The preparation method comprises the following steps:
(1) Placing the cleaned silicon wafer substrate and the proportioned precursor material into a tube furnace for chemical vapor deposition, controlling the reaction temperature and atmosphere, and completing the annealing process to lead CsPbBr 3 The microspheres are grown on a silicon wafer. Under 405nm femtosecond laser (200 fs,10 khz) pumping, capturing an output signal by using an ultrafast spectrometer to obtain a single-mode laser output power dependence graph as shown in figure 1.
(2) CsPbBr grown on the surface of silicon wafer by using Polydimethylsiloxane (PDMS) material 3 The microspheres adhere. Will be adhered with CsPbBr 3 Placing the PDMS of the microsphere in toluene, stirring for 3min to make CsPbBr 3 The microspheres were dispersed in toluene and PDMS removed.
(3) CsPbBr 3 Transferring the microsphere-toluene solution into a vacuum drying oven for drying to volatilize the solvent partially to obtain concentrated CsPbBr 3 Microsphere-toluene solution.
(4) According to 20:5: preparing LMA-EDGM-TPO solution (hereinafter referred to as curing solution) with mass ratio of 0.03, and mixing CsPbBr with mass ratio of 0.01wt% to 0.1wt% 3 Transferring the microsphere-toluene solution into a curing solution to obtain CsPbBr 3 Microsphere-curing solution.
(5) CsPbBr 3 Transferring the microsphere-curing solution into a quartz mold, irradiating with ultraviolet lamp at 405nm 6W and 365nm 6W for more than 6 min, and stripping the mold to obtainTo CsPbBr 3 A microsphere laser antenna.
(6) And under 405nm femtosecond laser (200 fs,10 khz) pumping, obtaining a single-mode laser luminescence spectrum chart by using an ultrafast spectrometer as shown in figure 2.
Experiments prove that CsPbBr before and after curing 3 The intensity of the laser generated by the microspheres does not change significantly, as shown in fig. 1 and 2. CsPbBr 3 The threshold of the stimulated lasing before curing of the microspheres was about 20. Mu.W, and the threshold of the stimulated lasing after curing was about 30. Mu.W, indicating that the curing process was specific to CsPbBr 3 The damage to the microspheres is small and after curing the microspheres can still achieve laser output under laser pumping while maintaining the properties of narrow pulse width and high cavity quality factor.
Example 2
This example illustrates how a photo-cured matrix based on LMA, EDGM, TPO composition can be prepared with a perovskite micro nano laser gain material of high concentration CsPbBr 3 The laser antenna of the microsphere realizes multimode laser output, and the stability of the laser antenna is verified. The preparation method comprises the following steps:
（1）CsPbBr 3 microsphere preparation, peel-off mode and formulation of curing solution CsPbBr was prepared according to the mass fraction of 0.5wt% as in example 1 3 Transferring the microsphere-toluene solution into a curing solution to obtain high-concentration CsPbBr 3 Microsphere-curing solution.
(2) High concentration CsPbBr 3 Transferring the microsphere-curing solution into a quartz mold, irradiating with ultraviolet lamp of 405nm 6W and 365nm 6W for more than 10min, and stripping the mold to obtain CsPbBr 3 Microsphere multimode laser antenna. And under 405nm femtosecond laser (200 fs,10 khz) pumping, obtaining a multimode laser output power dependence graph by using an ultrafast spectrometer as shown in figure 3.
According to the embodiment, the concentration of the microspheres in the solidification matrix is improved, and under the excitation of light spots with the same size, the defocused large-area excitation of the microspheres can be realized, and multimode laser is output. The high-intensity laser can be excited in a defocusing large area by adjusting and controlling the size of the microspheres to enable the cavity structure to be close.
Example 3
This example illustrates how CsPbBr-based can be prepared 3 /CsPbI 3 A laser antenna for the microsphere. The preparation method comprises the following steps:
(1) CsPbBr was prepared in a similar manner to example 1 3 Microsphere and CsPbI 3 And (3) microspheres.
(2) Preparation of the stripping and curing solution for microspheres in example 1, csPbBr was prepared at a ratio of 0.005wt% to 0.5wt% and 0.005wt% to 0.5wt% by mass 3 Microsphere and CsPbI 3 Transferring the microspheres into a curing solution to obtain CsPbBr 3 /CsPbI 3 Microsphere-curing solution.
(3) CsPbBr 3 /CsPbI 3 Transferring the microsphere-curing solution into a quartz mold, irradiating with ultraviolet lamp of 405nm 6W and 365nm 6W for more than 8 min, and stripping the mold to obtain CsPbBr 3 /CsPbI 3 A laser antenna for the microsphere.
In this embodiment, by changing the halogen ratio, a laser antenna with variable output wavelength is provided, and since the cesium-containing lead halide perovskite micro-nano laser gain material has a property of being widely tunable in the full spectrum band range of visible light, the design scheme of the laser antenna in the full spectrum band of visible light is illustrated in this embodiment.
Example 4
This example illustrates how a LMA, EDGM, TPO composition-based photocurable matrix can be prepared with a laser gain material of CsPbBr 3 A microcubed laser antenna, and thus realizing laser output. The preparation method comprises the following steps:
(1) Placing the cleaned silicon wafer substrate and the proportioned precursor material into a tube furnace for chemical vapor deposition, controlling the reaction temperature and atmosphere, and completing the annealing process to lead CsPbBr 3 The micron-sized cubes are grown on a silicon wafer. And capturing an output signal by using an ultrafast spectrometer under 405nm femtosecond laser (200 fs,10 khz) pumping.
(2) CsPbBr growing on silicon wafer surface by PDMS material 3 The microcubes adhere. Will be adhered with CsPbBr 3 Placing microcubed PDMS in toluene, stirring for 3min to obtain CsPbBr 3 Microcubes are dispersed in the armorPDMS was removed from benzene.
(3) CsPbBr 3 Transferring the microcube-toluene solution into a vacuum drying oven for drying to volatilize the solvent partially, thereby obtaining concentrated CsPbBr 3 Microcube-toluene solution.
(4) According to 20:5: preparing LMA-EDGM-TPO solution (hereinafter referred to as curing solution) with mass ratio of 0.03, and mixing CsPbBr with mass ratio of 0.01wt% to 0.1wt% 3 Transferring the microcube-toluene solution into a curing solution to obtain CsPbBr 3 Microcube-curing solution.
(5) CsPbBr 3 Transferring the microcube-curing solution into a quartz mold, irradiating with ultraviolet lamp of 405nm 6W and 365nm 6W for more than 6 min, and stripping the mold to obtain CsPbBr 3 A microcube laser antenna.
(6) And (3) under 405nm femtosecond laser (200 fs,10 khz) pumping, obtaining a single-mode laser luminescence spectrum by using an ultrafast spectrometer.
The laser performance of perovskite microstructures with other shapes and the preparation and verification of laser antennas based on other microstructures are proved through experiments.
Example 5
This example illustrates how to prepare a photo-cured matrix based on PMMA composition with a perovskite micro nano laser gain material of CsPbBr 3 And the laser antenna of the microsphere is used for realizing laser output. The preparation method comprises the following steps:
(1) Placing the cleaned silicon wafer substrate and the proportioned precursor material into a tube furnace for chemical vapor deposition, controlling the reaction temperature and atmosphere, and completing the annealing process to lead CsPbBr 3 The microspheres are grown on a silicon wafer. And capturing an output signal by using an ultrafast spectrometer under 405nm femtosecond laser (200 fs,10 khz) pumping.
(2) The PMMA powder material and the toluene solution were heated and stirred at 60 degrees to obtain a saturated PMMA-toluene solution.
(3) CsPbBr growing on silicon wafer surface by PDMS material 3 The microspheres adhere. Will be adhered with CsPbBr 3 Placing the PDMS of the microsphere in toluene, stirring for 3min to make CsPbBr 3 The microspheres were dispersed in toluene and PDMS removed.
(4) CsPbBr 3 Transferring the microsphere-toluene solution into a vacuum drying oven for drying to volatilize the solvent partially to obtain concentrated CsPbBr 3 Microsphere-toluene solution.
(4) Concentrated CsPbBr 3 Mixing and stirring the microsphere-toluene solution and the PMMA-toluene solution to obtain CsPbBr 3 Microsphere-curing solution.
(5) CsPbBr 3 Transferring the microsphere-curing solution into a quartz mold, irradiating with ultraviolet lamp of 405nm 6W and 365nm 6W for more than 6 min, standing to volatilize toluene therein, and stripping the mold to obtain CsPbBr 3 microsphere-PMMA laser antenna.
(6) And (3) under 405nm femtosecond laser (200 fs,10 khz) pumping, obtaining a single-mode laser luminescence spectrum by using an ultrafast spectrometer.
The laser antenna preparation method based on other photo-curing matrixes is proved by the experiments, and the universality of the photo-curing matrix selection of the laser antenna is verified.
Example 6
This example illustrates how a laser antenna based on LMA, EDGM, TPO composition of photo-cured matrix with micro-nano laser gain material as CdS microspheres can be prepared and laser output can be achieved. The preparation method comprises the following steps:
(1) The CdS semiconductor quantum dot polymer microspheres are synthesized by suspension polymerization in the presence of an inert diluent.
(2) Stripping of microspheres and preparation of curing solution according to example 1, cdS microspheres were transferred into the curing solution according to mass fractions of 0.005wt% to 0.5 wt%.
(3) Transferring the CdS microsphere-curing solution into a quartz mold, irradiating for more than 6 minutes by using ultraviolet lamps with the wavelength of 405nm 6W and 365nm 6W, and stripping the mold to obtain the CdS microsphere-PLMA laser antenna.
(4) Under the femtosecond laser pumping, a single-mode laser luminescence spectrum is obtained by using an ultrafast spectrometer.
Experiments prove that the laser antenna preparation method based on other micro-nano laser gain materials verifies the universality of the laser gain material selection of the laser antenna.
Example 7
This example illustrates how a laser antenna based on LMA, EDGM, TPO composition of photo-cured matrix with micro-nano laser gain material as ZnO microspheres can be prepared and used to achieve laser output. The preparation method comprises the following steps:
(1) Synthetic ZnO microspheres were formed on a quartz glass substrate by using a solid state laser.
(2) Peeling off the microspheres and preparing the curing solution according to example 1, the ZnO microspheres are transferred into the curing solution according to the mass fraction of 0.005-0.5 wt%.
(3) Transferring the ZnO microsphere-curing solution into a quartz mold, irradiating for more than 6 minutes by using ultraviolet lamps with the wavelength of 405nm 6W and 365nm 6W, and stripping the mold to obtain the ZnO microsphere-PLMA laser antenna.
(4) Under the femtosecond laser pumping, a single-mode ultraviolet laser luminescence spectrum is obtained by using an ultrafast spectrometer.
Experiments prove that the laser antenna preparation method based on other micro-nano laser gain materials verifies the universality of the laser gain material selection of the laser antenna.
The above detailed description is intended to illustrate the present invention by way of example only and not to limit the invention to the particular embodiments disclosed, but to limit the invention to the precise embodiments disclosed, and any modifications, equivalents, improvements, etc. that fall within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A laser antenna for optical coded communications, characterized by: the laser antenna comprises a laser gain material containing a cavity microstructure and a light-cured matrix wrapping the laser gain material containing the cavity microstructure, wherein the laser gain material containing the cavity microstructure is a micron-sized or submicron-sized laser gain material which is uniformly dispersed in the light-cured matrix, and the light-cured matrix is an organic polymer and is used for keeping the laser gain material containing the cavity microstructure.
2. A laser antenna for optically encoded communications as claimed in claim 1, wherein: the cavity-containing microstructure laser gain material is selected from lead halide perovskite microstructure, II-VI group compound microstructure, III-V group compound microstructure, silicon microstructure, organic material microstructure, zinc oxide microstructure or diamond mesoporous microstructure.
3. A laser antenna for optically encoded communications as claimed in claim 1, wherein: the cavity-containing microstructure laser gain material adopts a cesium-containing lead halide perovskite micro-level or submicron micro-level microstructure.
4. A laser antenna for optically encoded communications as claimed in claim 1, wherein: the cavity-containing microstructure laser gain material is in a submicron-level sphere or ellipsoid shape with the diameter of 0.4-1 micron or with the diameter of 1-10 microns;
or the cavity-containing microstructure laser gain material is in a submicron-level rod shape or cube shape with the size of 0.4-1 micron or the size of 1-10 microns.
5. A laser antenna for optically encoded communications as claimed in claim 1, wherein: the cavity-containing microstructure laser gain material does not generate aggregation in the photo-curing matrix, and each 1000 mu m of the light source contains 1-1000 cavity-containing microstructure laser gain materials.
6. A laser antenna for optically encoded communications as claimed in claim 1, wherein: the light-cured matrix is obtained by a polybutylene terephthalate curing method, a polylauryl methacrylate curing method, a polyvinyl fluoride curing method, a polymethyl methacrylate curing method or a polyurethane acrylic ester curing method.
7. A laser antenna for optically encoded communications as claimed in claim 6, wherein: the photocuring matrix is prepared by a polylauryl methacrylate curing method, an organic polymer is formed by a photoinitiator, a photocuring resin and a cross-linking agent, wherein the photoinitiator is (2, 4, 6-trimethylbenzoyl) diphenyl phosphine oxide, the photocuring resin is polylauryl methacrylate, the cross-linking agent is ethylene glycol diacrylate, and the weight ratio of the cross-linking agent to the ethylene glycol diacrylate is 0.03-0.07: 20: and 5, mixing and stirring the photoinitiator, the photo-curing resin and the cross-linking agent to obtain a solution-type photo-curing matrix, and forming a solid with stable property under ultraviolet irradiation.
8. A laser antenna for optically encoded communications as claimed in claim 7, wherein: the solution-state light-cured matrix is cured into a solid structure after being excited by light with the wave band of 300nm-600 nm.
9. Use of a laser antenna for optically encoded communication according to any of claims 1-8, characterized in that: the laser antenna is characterized in that the pulse light amplitude is adjusted to carry out optical coding design of 1 and 0 above and below the cavity-containing microstructure laser gain material threshold value in the laser antenna, and stable optical coding communication is realized by taking the cavity-containing microstructure laser gain material stimulated radiation laser threshold value as a coding basis, so that the laser antenna is applied to multiple-input multiple-output serial communication coding.
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