81 results about "Laser synthesis" patented technology

The invention discloses a laser hybrid welding method which comprises steps as follows: a laser with a first wavelength, which is used for increasing the absorptivity of a workpiece to be welded to a laser with a second wavelength, is transmitted; the laser with the second wavelength is transmitted; and the laser with the first wavelength and the laser with the second wavelength are synthesized into one laser beam, and simultaneously, the laser beam is focalized on the workpiece to be welded so as to weld the workpiece to be welded. Continuous laser of the laser with the first wavelength is used for illuminating the workpiece to be welded to achieve preheat, and simultaneously, pulse laser of the laser with the second wavelength is used for welding, so that the effect and the speed of high-efficiency laser welding can be achieved, the construction cost is lower, and the requirement for various aspects of heat dissipation, power consumption and the like can be reduced. Besides, the invention further provides a laser hybrid welding device adopting the laser hybrid welding method.

The invention discloses a method of compensating the laser aperture composed radar imaging distance to phase. The method comprises: respectively performing the difference frequency to the target path of the laser aperture composed radar and the target local oscillator path, the reference channel and the reference local oscillator path to obtain echo after difference frequency; calculating the first phase error ratio p(taux) of the target echo based on the second phase of the echo after difference frequency; precompensation the phase error using the p(taux) and constructing the auxiliary function S(p(taux)); obtaining the corresponding phase error ratio p'(taux) by the auxiliary function and compensating and compressing the distance of the target echo signal to the phase error. The invention solves the problem of echo phase error due to instability of the laser waveform, therefore the compensated echo is compressed in the azimuth direction.

The invention discloses a novel all optical fiber laser synthesizer which is used for high-power optical fiber lasers and amplifiers and a preparation method thereof. The novel full optical fiber laser synthesizer is composed of an optical fiber bundle consisting of a plurality of optical fibers with a certain diameter, wherein the optical fiber bundle comprises a rare earth doped fiber 11 in the middle and a plurality of multimode optical fibres 12, the shape of the rare earth doped fiber 11 the coating of which is removed is regular polygon, and the shape of the multimode optical fibre the coating of which is removed is round; all optical fibers in a middle position 02 are tight and close, and the outer surface of the optical fiber bundle is coated with a coating with the refractive index lower than that of pure quartz; and all optical fibers on two end parts 01 and 03 of the optical fiber bundle can be separated, and each optical fiber is independently coated with a coating. The fiber bundle is formed by carrying out wiredrawing on the corresponding optical fiber preform bunch on an optical fiber wire drawer tower in the mode of designed arrangement. The full optical fiber laser synthesizer of the invention has simple preparation process, is suitable to be produced in large batch and has the characteristics of high reliability and low insertion loss.

The invention provides an intermediate infrared super-continuum spectrum laser light source. The intermediate infrared super-continuum spectrum laser light source includes a first laser seed source, a second laser seed source, a first laser pumping source, a second laser pumping source, a firs pump combiner, a second pump combiner, an erbium-doped gain optical fiber, a thulium-doped gain optical fiber, a coupler and a sulfide photonic crystal optical fiber; the firs pump combiner combines light outputted by the first laser seed source and the first laser pumping source into pulsed laser which is amplified by the erbium-doped gain optical fiber; the second pump combiner combines light outputted by the second laser seed source and the second laser pumping source into pulsed laser which is amplified by the erbium-doped gain optical fiber; the coupler combines the two beams of pulsed laser into dual-wavelength laser and couples the dual-wavelength laser into the sulfide photonic crystal optical fiber, so that intermediate infrared super-continuum spectrum laser can be outputted; and the sulfide photonic crystal optical fiber includes an annular wrapping layer and a fiber core arranged at the center of the annular wrapping layer, wherein the fiber core is connected with the annular wrapping layer through supporting arms. With the intermediate infrared super-continuum spectrum laser light source of the invention adopted, the spectral range of the intermediate infrared super-continuum spectrum laser can be extended.

The present invention relates to a direct laser synthesis and making process of hard alloy coating, and belongs to the field of hard alloy making and applying technology. By means of the hard alloy forming material system and high-energy laser to produce special physical and chemical metallurgical and fast solidification characteristic, hard alloy coating is formed directly through reaction in melting bath. The hard coating is dense, gas hole free and without crack and other faults, combines metallurgically with the base material, has the components, micro structure and performance of the hard alloy and any required shape. The coating may be formed in the surface of various engineering metal parts, and may be used widely in hard alloy cutter, mold antiwear part, etc.

The invention discloses a wavelength measurement method and device based on a laser synthesized wavelength interference principle. An output beam of a reference laser device and an output beam of a laser device to be measured are modulated into orthogonal linearly polarized light which is emitted to a laser synthesized wavelength interferometer to form an interference signal of the reference laser device and an interference signal of the laser device to be measured; when a first pyramid prism of the interferometer moves, a phase difference change 2pi of the two interference signals corresponds to the displacement of the first pyramid prism when the first pyramid prism shifts by a half of a synthesized wavelength lambada S formed by a reference laser wavelength lambada R and a laser wavelength to be measured lambada U; when the lambada S is small, the position where the two interference signals pass by a zero point simultaneously for twice is detected to obtain the value of the lambada S; when the lambada S is large, a second pyramid prism is moved first, the position where the two interference signals pass by the zero point simultaneously for twice is detected, and then the value of the lambada S is obtained in combination with the corresponding relation between displacement of the second pyramid prism and the displacement of the first pyramid prism; lastly, the value of the laser wavelength to be measured is obtained according to the relation between the lambada U and the lambada S and the relation between the lambada R and the lambada S. The wavelength measurement method and device based on the laser synthesized wavelength interference principle are wide in laser wavelength measurement range, strong in resistance to environmental disturbance, and high in wavelength measurement accuracy.

The utility model discloses a wavelength tunable coherent laser beam system based on double gratings and belongs to the field of laser combined beams. The system comprises a semiconductor laser array, a first lens, a dammam grating, a second lens, a diaphragm, a third lens, a blazed grating and a grating rotary device. The second lens, the diaphragm and the third lens form a space filter. The blazed grating is fixed on the grating rotary device. A group of parallel laser beams emitted by the semiconductor laser array converge to reach the dammam grating, and the dammam grating combines the laser beams. The space filter filters zero order light in the combined laser beams, and the filtered zero order light is used as first grade incident light to form a Littrow structure with the blazed grating. First grade direction reflection light is fed back to the dammam grating along an original light path. The beams are divided after reaching the damman grating, are injected into various light-emitting units of the semiconductor laser array and jointly lock the wavelength and phase positions so as to realize coherent combined beams. The wavelength tunable coherent laser beam system combines a plurality of laser beams into a beam of high-power laser, and has the advantages of being high in reliability and good in laser beam quality, working in a single wavelength mode, and the like.

The invention provides a composite of silver nanoparticles decorated with graphene quantum dots (Ag-GQDs) using pulsed laser synthesis. The nanocomposites were functionalized with polyethylene glycol (PEG). A concentration of 150 μg / mL of Ag-GQDs, a non-toxic level for human cells, exhibits strong antibacterial activity against both Gram-Positive and Gram-Negative Bacteria.

The invention discloses a laser synthesis method of LaGaO3 based solid electrolyte. Laser beams are utilized for direct heating to generate the material components of LaGaO3 based solid electrolyte, and the raw materials react in a laser molten pool to generate electrolyte and then is cooled down and solidified. In the invention, a laser sintering rapid synthesis method is utilized to prepare the LaGaO3 based solid electrolyte, the reaction process is simple, the sintering speed is high, tens of grams of samples can be sintered completely in a few seconds, high temperature formed by the high energy of laser beams causes the raw materials to react under a melting state, the reaction of raw materials is very adequate, products manufactured by the laser sintering method has high purity, cooling and solidification are carried out after reaction, therefore, produced products have very high density, and the electrical behavior is very superior.

An embodiment of the invention provides a myriawatt-level ultra-high-power all-fiber continuous fiber laser system, which comprises a total electric control module, at least two laser modules connected with the total electric control module respectively, and a laser synthesis module connected with the output ends of the at least two laser modules. The total electric control module is used for controlling on or off of each laser module, and monitoring operation states of each laser module and the laser synthesis module; the laser module is used for independently generating preset first-power laser; and the laser synthesis module is used for coupling the laser output by the started laser modules and outputting coupled preset second-power laser. The system realizes output of high-power laser;and meanwhile, through the modular design of each laser module integrating an electronic control submodule, power submodule and a laser unit, the myriawatt-level ultra-high-power all-fiber continuousfiber laser system is allowed to have concise structural and functional design, and is easy to realize commercial mass production.

The invention discloses a method for applying an M sequence to phase encoding system imaging radar pulse compression. The method is applied to a laser synthetic aperture radar imaging system. With the method adopted, the problem of imaging quality reduction and existence of virtual images which are caused by excessive sidelobe which is further caused by a situation that a traditional pulse compression system adopts a fast convolution method to perform pulse compression, can be solved. According to the method of the invention, phase codes are the M sequence, and the algorithm of pulse compression is a periodic convolution method. The method is characterized in that a matrix which is used for the pulse compression and is constructed in a manner that the M sequence is prolonged and is subjected to shifting operation so as to form the matrix is used so as to match the design of a filter. With the method adopted, sidelobe suppression can be realized under the premise that the complexity of the algorithm is not increased, and the sidelobe can be suppressed to be 1 / P under the condition that the length of code elements is P.

The invention discloses a transition metal chalcogenide compound horizontal homogeneous junction solar cell and a preparation method thereof, and belongs to the field of semiconductor materials. The solar cell comprises an insulating substrate, an electrode A, an electrode B, an n-type transition metal chalcogenide compound film and a p-type transition metal chalcogenide compound film; the electrode A and the electrode B are located at the two ends of the insulating substrate respectively; and the n-type transition metal chalcogenide compound film and the p-type transition metal chalcogenide compound film are composed of the same compound, and are transversely connected to form a p-n junction. The method adopts a laser synthesis method to prepare the n-type transition metal chalcogenide compound film, and by virtue of the horizontal homogeneous p-n junction, the lattice mismatch rate of p-n junction is effectively lowered, and the interface defects are reduced; the electrodes are matched with a thin film work function to form high ohmic contact; and the electrodes and the thin films are combined by van der waals force, so that damage of an electrode preparation process to the thinfilms can be effectively avoided, the caused problems of stress, metal diffusion and the like are solved, and the conversion efficiency of the solar cell applying the thin films is improved.

The invention discloses a method laser synthesis of cobaltosic oxide nano particles. According to the invention, a cobalt metal target material is taken as a raw material, the surface of the target material is cleaned and dried, then the target material is placed in a beaker, deionized water is added; a nanosecond pulse laser is turned on, the cobalt metal target material is burned; after laser effecting, a solution in the beaker is taken out, the solution is subjected to centrifugal enrichment, then is placed in a refrigerator for refrigeration and solidification, the solution is placed in a vacuum freeze drier, and the cobaltosic oxide nano particles through laser synthesis can be obtained. The cobaltosic oxide nano particles have high specific surface area and abundant oxygen vacancy, has zinc air battery performance which exceeds that of commercial precious metals platinum carbon and ruthenium dioxide under normal-temperature normal-pressure and common synthesis environment, synthesis process is simple, control is easy, the nano-material output is abundant, cost is low, no toxic raw material is used, and the method has large application prospect.

The laser synthesis process of negative thermal expansion coefficient material belongs to the field of laser technology application. Under the direct heating of laser beam, the raw materials for the negative thermal expansion coefficient material are reacted in a laser bath and solidified fast. The laser is CO2 gas laser or Nd:YAG solid laser of laser wavelength 10.6 micron or 1.06 micron, power density of 0.2-1.5 kW / sq cm and laser scanning speed of 0.2-12 mm / s. The negative thermal expansion coefficient material is ZrW2O8, HfW2O8, Zr1-xHfxW2O8 with x in 0-1.0, Zr1-xHfxMo2O8 with x in 0-1.0, ZrMo2-xWxO8 with x in 0-2.0 or HfMo2-xWxO8 with x in 0-2.0. The present invention has the features of fast synthesis speed, low cost, no pollution and being suitable for continuous production.

The invention belongs to the technical field of the preparation of a high-frequency dielectric ceramic material and particularly relates to a fast laser synthesis method of CaTiO3-CaTiSiO5. The method comprises the following steps of: fully mixing, grinding and compacting analytically pure CaCO3 powder, TiO2 powder and SiO2 powder serving as raw materials, irradiating the raw materials by using 600 to 1,300W CO2 laser beams to make the raw materials react; and then cooling and condensing the reaction product to form ceramics so as to obtain the CaTiO3-CaTiSiO5, wherein the substance molar ratio of CaCO3, TiO2 to SiO2 is 1:1:0.5. The method has the advantages of simple process, high purity, low cost, and low energy consumption; and the obtained sample has the advantages of high density, high dielectric constant and high process repetitiveness.

The invention belongs to the technical field of preparing a microwave dielectric ceramic material, and particularly relates to a laser synthesis method for barium tetratitanate. The method comprises the following steps of: taking BaCO3 and TiO2 powder as raw materials; fully mixing, grinding and pressing the powder; then irradiating the materials with a CO2 laser beam of 600 to 1,000W to make the materials react; and cooling and solidifying the mixture into ceramic to finally obtain the barium tetratitanate. The ratio of amount of substance of the BaCO3 to the TiO2 is 1:4. The method has the advantages of simple process, low cost, low time consumption and low energy consumption; and the obtained samples have high density, high dielectric constant and good process repeatability.

The invention discloses a multi-wavelength laser modulation one-dimensional bar code reader and an implementing mode of the multi-wavelength laser modulation one-dimensional bar code reader. The bar code reader comprises laser tubes, collimating lenses, a light beam combiner mirror, a reflecting mirror, a photoelectric receiving sensor and an analog-digital decoding circuit. The multiple laser tubes are arranged, wavelengths of lasers emitted by the laser tubes are different, each laser tube corresponds to one collimating lens, the lasers emitted by the laser tubes enter the light beam combiner mirror through the corresponding collimating lenses, a laser synthetic beam is irradiated on the reflecting mirror, the lasers are reflected by the reflecting mirror and then irradiated on one-dimensional bar codes, and the photoelectric receiving sensor receives information reflected by the one-dimensional bar codes, converts optical signals into electric signals, and then sends the electric signals to the analog-digital decoding circuit. The multi-wavelength laser modulation one-dimensional bar code reader can eradiate interference of light of the external environment, the defect that one-dimensional bar codes which are printed in the color similar to the color of the lasers can not be correctly read in the prior art is overcome, and the multi-wavelength laser modulation one-dimensional bar code reader has the advantages of being wide in application occasions and accurate in recognition.

The invention relates to a laser emission system. The system comprises a first light source device, a second light source device, an optical splitter, and a synthesizer. The first light source deviceand the second light source device are optically connected to the optical splitter. The optical splitter is optically connected to the synthesizer. The first light source device and the second light source device are used for emitting a polarized laser. The polarized laser comprises a P state laser and an S state laser. The optical splitter is used to transmit the P state laser in the polarized laser and reflect the S state laser, or to transmit the S state laser in the polarized laser and reflect the P state laser. The synthesizer is used to synthesize the two paths of polarized lasers outputby the optical splitter into one path of laser. By using the laser emission system, the polarized lasers emitted by the first light source device and the second light source device pass through the optical splitter and the synthesizer, and then the two paths of lasers are combined into one path so that the frequency of the laser emitted by the laser emission system is doubled; and the frequency of the laser emitted by the laser emission system is increased and then the performance of the laser emitted by the laser emission system is improved.

The invention discloses a coherent laser synthesis system, which comprises a laser source and a lens array, and is characterized in that the lens array comprises a plurality of lenses, and the lenses are arranged according to a preset non-equal-period non-uniform spatial density Fermat spiral array, wherein the laser source is used for generating a plurality of laser beams, the laser beams meet coherence conditions, and the plurality of laser beams are in one-to-one correspondence with the plurality of lenses; and the lens is used for receiving the multiple laser beams and collimating the multiple laser beams, so that the laser beams emitted by the lens are coherently superposed in a far field to obtain a combined beam. According to the invention, the lenses are arranged according to the Fermat spiral array with non-equal period and non-uniform space density, so that the lens array is arranged in a manner of compact center and sparse edge, and the sidelobe intensity of the coherent combination far field is weakened while the power ratio in the barrel of the coherent combination far field is improved.

The invention provides a micro-droplet fluorescence signal detection device. The micro-droplet fluorescence signal detection device comprises a light source synthesis module for synthesizing a plurality of lasers with different wavelengths into mixed exciting light; an objective lens which is located on a light conduction path of the mixed exciting light and can confocal the mixed exciting light on the micro-droplet to be detected so as to excite and generate a plurality of different fluorescence signals corresponding to different lasers, and collimate the plurality of different fluorescence signals into parallel light; an optical processing module which comprises a convex lens and an optical fiber, and the first end of the optical fiber is located on the focus of the side, away from the objective lens, of the convex lens so as to receive and transmit a plurality of different fluorescence signals focused on the convex lens; and a signal receiving module used for processing a plurality of different fluorescence signals received and transmitted by the optical fiber. The optical fiber is adopted as a rear-end fluorescence collection and transmission component, the loss of fluorescence signals is effectively reduced, the optical processing module and the signal receiving module are independently connected through the optical fiber, the signal receiving module can be randomly arranged in the space, and the arrangement flexibility of the system is improved.

The invention discloses a multi-channel laser absorption spectrum measuring system. The measuring system comprises an adjustable laser device group, a laser synthesis unit, a laser dividing unit, a Fabry-Perot interferometer, a first detector, a to-be-detected gas cavity, a second detector and a display device, wherein the adjustable laser device group comprises multiple adjustable laser devices; the laser synthesis unit is used for converging lasers sent from the multiple adjustable laser devices into a synthesized laser beam; the laser dividing unit is used for dividing the synthesized laser beam sent from the laser synthesis unit into a first laser beam and a second laser beam which are the same; the Fabry-Perot interferometer is used for laser frequency calibration; the first detector is positioned at the rear end of the Fabry-Perot interferometer and is used for detecting the intensity of the first laser beam passing through the Fabry-Perot interferometer; the to-be-detected gas cavity is used for containing to-be-detected gas; the second detector is positioned at the rear end of the to-be-detected gas cavity and is used for detecting the intensity of the second laser beam passing through the to-be-detected gas cavity; the display device is used for displaying a detection result. The measuring system has the advantages of large coverage range of adjustable output laser wave length, no frequent replacement of optical paths in the use of the measuring system, and the like.

The invention relates to an optical fiber beam combining and splitting device, and belongs to the technical field of lasers, the optical fiber beam combining and splitting device adopts a type structure, and the application effect of the optical fiber beam combining and splitting device is that lasers in root input optical fibers are combined and then distributed into root output optical fibers, which is equivalent to the use of an individual type structure optical fiber beam combiner, wherein MxP1=P is the number of the input optical fibers and M>=2 is the number of the output optical fibers. The optical structure is an integrated structure, the characteristic that the outer ring can accommodate more optical fibers than the inner ring on the cross section of the optical fiber bundle formed by the root input optical fibers is fully utilized, and the equivalent tapering ratio of the optical fibers is reduced compared with that of a structural optical fiber beam combiner. According to the invention, the number of optical devices in the laser can be reduced, layout, wiring and integration of the laser are simplified, miniaturization and light weight of the laser are facilitated, and by adopting the type structure, the tapering ratio of the optical fiber can be reduced, the synthesis efficiency can be effectively improved, the thermal load can be reduced, and the temperature rise rate can be inhibited.

The invention relates to the field of white laser light source manufacturing, and concretely relates to a white laser light source generating device and method. The device comprises: a first pump laser used for generating first pump laser; a second pump laser used for generating second pump laser, wherein the wavelength of the first pumping laser is smaller than that of the second pumping laser; a laser beam combiner used for combining the first pumping laser and the second pumping laser which enter the laser beam combiner from different incident light path directions into pumping laser with the same emergent light path direction, namely combined pumping laser; and a periodically poled crystal which generates purple laser from part of the first pumping laser in the combined pumping laser, generates green laser from the second pumping laser, and generates white laser from the purple laser, the green laser and the remaining first pumping laser in the combined pumping laser. The periodically poled crystal converts two beams of incident pumping laser into purple laser and green laser at the same time, so that the necessary conditions for generating a white laser light source are met.

The invention discloses a photoacoustic noninvasive blood glucose detector which comprises a laser emitting circuit, a probe, a signal processing circuit and a control circuit, wherein the laser emitting circuit is used for generating laser signals; the probe is used for detecting tissue blood glucose according to the laser signals; the signal processing circuit is used for processing probe signals; the control circuit is used for achieving blood glucose judgment and component control; and the laser emitting circuit comprises a pulse emitting circuit for transmitting a pulse signal to drive laser diodes, a switch circuit for controlling on / off of laser diode branches, a plurality of laser diodes, a light beam combiner for combining multiple paths of laser into one path of light to be output, and an optical coupler which is arranged between the laser diodes and the light beam combiner. As the laser emitting circuit adopts multiple laser diodes, multiple paths of pulse light can be emitted, rich photoacoustic spectrum information can be acquired through stimulation of multiple wavelengths, and the detection precision of the blood glucose detector can be greatly improved.

;The invention relates to a high-frequency NO-PLIF imaging measurement device and method for a combustion field, and the device comprises a high-frequency laser which is used for generating 1064nm laser with the repetition frequency of 100kHz and outputting 355nm laser after triple frequency multiplication of the 1064nm laser, wherein the 355nm laser is divided into a first 355nm laser beam and asecond 355nm laser beam through a first lens a seed laser module which is used for generating 822.3 nm seed laser; an optical parametric oscillator which is used for converting the first beam of 355 nm laser input by the high-frequency laser and the 822.3 nm laser input by the seed laser module to generate 624.7 nm laser; an NO-PLIF module which is used for synthesizing 624.7 nm laser input by theoptical parametric oscillator and a second beam of 355 nm laser input by the high-frequency laser into 226 nm light, wherein the 226 nm light is gathered in a standard gas pool through a convex lensto react with NO to generate a PLIF optical signal; and an imaging measurement module which is used for imaging the PLIF optical signal and then processing the PLIF optical signal in the computer to obtain the flame temperature of the combustion field to be measured.

The invention provides a laser synthesis system and a high-power laser experimental apparatus. The laser synthesis system comprises a pulse seed source, a beam splitting module, a first amplifying module, a second amplifying module and a beam combining module, wherein the pulse seed source is used for emitting laser pulse and transmitting the laser pulse to the beam splitting module; the beam splitting module separates the laser pulse into first light wave and second light wave according to the polarization property, and transmits the first light wave and the second light wave to the first amplifying module and the second amplifying module correspondingly, wherein the polarization directions of the first light wave and the second light wave are perpendicular to each other; the first amplifying module is used for amplifying the first light wave and transmitting the amplified first light wave to the beam combining module; the second amplifying module is used for amplifying the second light wave and transmitting the amplified second light wave to the beam combining module; and the beam combining module performs synthesis on the first light wave and the second light wave to obtain thesynthesized laser. Through the mode of performing beam splitting and amplifying treatment firstly and then performing synthesis treatment, overlaying and amplifying of two paths of signals can be realized to obtain the high-power pulse laser through synthesis, with higher stability; and in addition, the damaged rate of related devices is greatly lowered.

The invention provides a diagnosis device and a diagnosis method for multi-beam ultra-short pulse time synchronization and phase synchronization. The diagnosis device consists of a first reflecting mirror, a second reflecting mirror, a phase delayer, a time delayer, a lens, a CCD, a concave cylindrical mirror, a self-coherent signal generator, a phototube, an optical filter and a guide rail, wherein the sequential concave cylindrical mirror, the self-coherent signal generator, the phototube and the optical filter form a self-coherent detection module, the CCD is a phase detection module, and the self-coherent detection module and the phase detection module are fixed on a flat plate in a paratactic mode. The diagnosis device and the diagnosis method can achieve a time synchronization and phase synchronization diagnosis function during multi-beam petawatt laser synthesis and have important guiding and monitoring effects on high-energy petawatt laser output.