517 results about "Pulsed laser beam" patented technology

A processing method of a workpiece with a circular disc shape includes sticking a tape to one surface of the workpiece and integrating the workpiece and a frame through the tape, holding the workpiece by a holding unit with the interposition of the tape, and irradiating the other surface of the workpiece located on the opposite side to the one surface with a pulsed laser beam having such a wavelength as to be absorbed by the workpiece from the side of the other surface. In irradiating the laser beam, the other surface is annularly irradiated with the laser beam in the state in which the orientation of the laser beam is adjusted in such a manner that the laser beam has an angle of incidence formed due to inclination with respect to a normal to the other surface of the workpiece by a predetermined angle.

The invention provides a wafer laser stripping method and device, and belongs to the technical field of wafer manufacturing, and the method comprises the steps: 1, transmitting a pulse laser beam I through a nanosecond laser, focusing the pulse laser beam I to a first depth H1 in a to-be-processed wafer, and carrying out scanning processing to form a first modified layer; step 2, a pulse laser beam II is emitted through a nanosecond laser, the pulse laser beam II is focused at a second depth H2 of the wafer to be processed for scanning processing, a stripping layer is formed, the energy of the pulse laser beam II is smaller than that of the pulse laser beam I, and the second depth H2 is smaller than the first depth H1; and step 3, stripping the surface of the to-be-processed wafer in a vacuum adsorption mode to obtain a target wafer. According to the method, crack induction, crack propagation and target wafer stripping can be carried out by adopting one device, the required stripping force is small, and stripping of the target wafer can be realized by only needing the force of 40-60N.

The invention discloses a cloud and mist particle acquisition probe based on interference particle imaging, and the probe comprises a sheet-shaped laser emission unit which is used for emitting sheet-shaped pulse laser beams, expanding the laser beams, adjusting the incident position and the incident angle, and irradiating cloud and mist particles to generate scattered light signals; the scattered light signal acquisition unit is used for collecting scattered light signals and recording the scattered light signals on the camera; the mechanical unit comprises a first measuring arm used for installing the sheet-shaped laser unit and a second measuring arm used for installing the scattered light signal acquisition unit, and the first measuring arm and the second measuring arm are connected through a connecting section and are installed on the base; and the signal processing system is used for processing the scattered light interference signal recorded by the camera to obtain cloud and mist particle parameters. The acquisition probe provided by the invention ensures stable operation of a photoelectric system in a low-temperature complex and severe cloud environment, improves the accuracy of interference particle imaging measurement, and realizes real-time measurement of cloud particle parameters suitable for different industrial scenes.

The invention discloses a coaxial composite laser welding method and a welding method of a flat wire motor winding, and relates to the technical field of laser welding, coaxial composite laser beams are adopted to act on the surface of a high-reflection material to form a welding pool, the coaxial composite laser beams comprise an outer ring laser beam and a core laser beam, the outer ring laser beam is a pulse laser beam, and the core laser beam is a core laser beam; the core laser beam is a continuous laser beam, the continuous laser beam forms a main molten pool, the pulse laser beam forms an auxiliary molten pool, and the main molten pool and the auxiliary molten pool have overlapped parts. The continuous laser and the pulse laser are combined, the main molten pool formed by the continuous laser and the auxiliary molten pool formed by the pulse laser are communicated in an overlapped mode, the pulse laser disturbs molten metal in the auxiliary molten pool and drives the molten metal in the main molten pool to achieve the oscillation stirring effect, and the laser energy absorption efficiency of the high-reflection material can be improved; and the energy distribution of the heat source can be optimized by adjusting the energy proportion and the focus point position, the energy state of the heat source is accurately controlled, and zero splashing is achieved.

The invention relates to the technical field of laser radars, in particular to a laser radar near-field saturation suppression method and device based on signal splicing. The method comprises the following steps: transmitting a pulse laser beam and receiving a scattering echo signal, dividing the echo signal into a transmission light signal and a reflection light signal through an intensity beam splitter prism, and respectively obtaining a far-field channel photon profile and a near-field channel photon profile through the transmission light signal and the reflection light signal; fusing and splicing the far-field channel photon profile and the near-field channel photon profile to obtain a corrected distance square signal profile; and performing atmospheric detection by using a laser radar system, and inverting atmospheric parameters by correcting a distance square signal profile. Meanwhile, the invention discloses a device for executing the method, by adopting the laser radar near-field saturation suppression method and device based on signal splicing, the problem of near-field signal saturation of a high-power laser radar can be effectively solved, and the overall performance index of the laser radar is greatly improved while the detection precision is guaranteed.

The invention relates to the technical field of solar cells, and particularly discloses a method for improving conductive contact of a micro-area of an N-type cell, which comprises the following steps of: (1) performing first micro-area conductive treatment on one side of a cell grid line of the N-type cell: scanning a first side edge of the cell grid line through a first pulse laser beam, and applying a first reverse bias voltage to the cell at the same time; and (2) performing second micro-area conductive treatment on the other side of the cell grid line of the N-type cell: scanning a second side edge, opposite to the first side edge, of the cell grid line through a second pulse laser beam, and applying second reverse bias voltage to the cell at the same time. According to the method, the pulse laser beams with more concentrated energy are used for carrying out single-side scanning on the two side edges of the grid line of the battery piece respectively, and precise treatment on the metal electrode on the basis of not damaging the passivation layer of the battery can be realized, so that the contact performance of the battery is optimized, the contact resistance of the battery is greatly reduced, and the performance of the battery piece is improved.

The invention discloses a device for realizing micro-nano optical control on a planar solid substrate. The device comprises a pulse laser; the energy adjusting element is used for adjusting the energy of the pulse laser emitted by the pulse laser; the focusing objective lens is used for focusing the incident pulse laser beam to form a driving light spot; the substrate is used for supporting a controlled micro-nano sample; the two-dimensional motion mechanism is used for controlling and driving the relative position of the light spot and the micro-nano sample; the substrate is in Van der Waals contact with the micro-nano sample; and during control, the driving light spot is asymmetrically focused on the micro-nano sample. The method is easy and convenient to operate and high in repeatability, has the remote and non-contact characteristics of general light control, and can realize high-precision, arbitrary-direction and long-distance optical control on a solid interface with high adhesion force in a breakthrough manner under the condition that no special requirements are provided for experimental instruments.

The invention discloses an intelligent mango harvesting device, belongs to the field of fruit harvesting equipment, and aims to solve the technical problems of fruit damage and inaccurate maturity judgment caused by contact detection of existing mango harvesting equipment. According to the technical scheme, the method is characterized in that a laser emission module emits a pulse laser beam with the wavelength of 10.3-10.6 microns, and the pulse laser beam is focused by a lens group and then irradiated to a detection area which is 5-15 cm away from the surface of the mango; the laser interacts with ethylene molecules to generate a photoacoustic signal, and the photoacoustic signal is received by a microphone with a sound insulation cover; the signal processing unit converts the photoacoustic signal into a digital electric signal, and the controller calculates the ethylene concentration according to the digital electric signal and compares the ethylene concentration with a preset threshold to judge the maturity. The device is mainly used for automatic lossless harvesting in a mango garden, and the fruit damage rate is remarkably reduced.

The laser beam splitting processing device comprises an annular track, a rotating mirror module is located at the center position of the annular track, and N beam splitting light path modules are evenly distributed on the annular track; the laser device is a pulse laser device, the frequency of a laser beam output by the laser device is fHz, the laser beam emitted by the laser device enters the rotating mirror module after being collimated by the collimator, the rotating mirror module can rotate by 360 degrees around the center of an optical axis under the action of the driving device, and the rotating speed of the driving device is x revolutions per second. The control system is in control connection with the laser device and the driving device, the frequency of laser beams output by the laser device and / or the rotating speed of the driving device are regulated and controlled to meet the following formula: f = N.x, f, N and x are positive integers, the laser beams are emitted by the rotating mirror module, and the emitted laser beams are irradiated in the light splitting optical path modules while rotating, each light splitting optical path module receives a pulse laser beam, and precise regulation and control of light splitting of the beam is achieved.

A method of analyzing one or ejecta, specifically kinematic properties, resulting from a dynamic event. The method comprising using a single trigger, single image sensor three dimensional photography system comprising a first plurality of pulsed laser beams, a stage for the dynamic event to occur and be observed and where the first plurality of pulsed laser beams converge. The laser beams are recombined into a single pulsed laser beam after the stage for capture on the single image sensor to a subframe for each pulsed laser beam, the subframes being combined into a unique frame for each time step. The frames are analyzed with respect to time to determine the displacement, velocity and / or acceleration thereof.

The invention belongs to the technical field of machining, and discloses an aero-engine titanium alloy blade strengthening machining system and method. The mechanical arm is used for clamping a blade to be strengthened, and the mechanical arm is electrically connected with the controller; the laser etching unit is electrically connected with the controller and used for outputting a picosecond-level pulse laser beam according to a machining instruction issued by the controller, and the picosecond-level pulse laser beam is used for conducting etching machining on the surface of the blade to be strengthened on the mechanical arm according to a preset light spot path; and the acquisition unit is electrically connected with the controller and is used for acquiring the strengthening pattern of the laser etching unit in the light path calibration process and uploading the acquired strengthening pattern to the controller. The method can improve the machining efficiency, can be used for surface strengthening of the titanium alloy complex thin blade of the aero-engine, overcomes the defects of large deformation and laser-induced shock wave rebound when the traditional technology is applied to the thin-wall blade, and can be used for surface strengthening of high-added-value thin-wall parts in the aerospace field.

The invention relates to a multi-beam fusion deposition system and method, in particular to a multi-beam fusion deposition system, an additive manufacturing method, a metal welding method and a metal cutting method. According to the multi-beam fusion deposition system, in the deposition machining process of additive manufacturing, metal welding, metal cutting and the like, the blue or green laser, the infrared laser and the pulse laser are matched with one another to act on the to-be-machined material in the deposition area in a synergistic mode, so that the laser absorption rate of the to-be-machined material is increased, and the deposition efficiency is improved. Energy waste in the deposition machining process is reduced, the machining efficiency is improved, the machining cost is reduced, meanwhile, the pulse laser beams can stir the preset molten pool formed in the to-be-machined material, convection is formed in the preset molten pool, energy distribution in the preset molten pool is promoted to dynamically change, components are evenly mixed, and the machining efficiency is improved. And meanwhile, bubbles can overflow from the preset molten pool, the deposition machining quality is effectively improved, and the machining defect rate is reduced.

A fractional handpiece and systems thereof for skin treatment include a passively Q-switched laser assembly operatively connected to a pump laser source to receive a pump laser beam having a first wavelength and a beam-splitting assembly operable to scan a solid beam emitted by the passively Q-switched laser assembly and form an array of micro-beams across a segment of skin. The passively Q-switched laser assembly generates a sub-nanosecond pulsed laser beam having a second wavelength. The fractional handpiece may also incorporate a wavelength switching assembly, enabling selective delivery of both the second and third wavelengths, while providing control over the energy output at each wavelength, all within a single handpiece. The passively Q-switched laser assembly has an unstable cavity operation.

A fractional handpiece and systems thereof for skin treatment include a passively Q-switched laser assembly operatively connected to a pump laser source to receive a pump laser beam having a first wavelength and a beam-splitting assembly operable to scan a solid beam emitted by the passively Q-switched laser assembly and form an array of micro-beams across a segment of skin. The passively Q-switched laser assembly generates a sub-nanosecond pulsed laser beam having a second wavelength. The fractional handpiece may also incorporate a wavelength switching assembly, enabling selective delivery of both the second and third wavelengths, while providing control over the energy output at each wavelength, all within a single handpiece. The passively Q-switched laser assembly has an unstable cavity operation.

The invention relates to the technical field of metal surface coating preparation, and discloses a cladding layer surface and deep defect detection method based on pulse laser, which comprises the following steps: clamping and fixing a workpiece; pulse laser excitation and bimodal signal synchronous excitation are carried out; synchronously acquiring and recording dual-channel signals; thermal wave signal processing and surface / near-surface flaw analysis; performing ultrasonic signal processing and deep defect analysis; and carrying out information fusion and three-dimensional flaw reconstruction. According to the invention, the pulse laser beam is utilized to excite the thermal wave and the ultrasonic wave at the same time, various flaws from the surface to the deep layer can be covered through one-time detection, the limitation of a single detection mode is solved, and meanwhile, the depth information of the flaws can be obtained by analyzing the phase diagram of the thermal wave signal; three-dimensional distribution of flaws can be reconstructed by combining ultrasonic time-of-flight (ToF) analysis and infrared sequence images, and accurate positioning and quantitative evaluation are realized.

The invention provides a preparation method and device of a three-dimensional periodic structure, and the method comprises the steps: obtaining a target three-dimensional multi-focus light spot array according to the size of a single periodic structure of the three-dimensional periodic structure, a preset focus light spot number and a preset focus light spot layer number; according to the target three-dimensional multi-focus light spot array, target three-dimensional multi-focus light spot light field distribution is obtained; obtaining a three-dimensional multi-focus light spot phase distribution diagram according to the target three-dimensional multi-focus light spot light field distribution; loading the three-dimensional multi-focus light spot phase distribution diagram to a spatial light modulator so as to modulate an incident light field formed by an initial pulse laser beam output by a laser into a three-dimensional multi-focus light spot light field; and according to the three-dimensional multi-focus light spot light field and a preset laser scanning path used for representing the shape of the single periodic structure of the three-dimensional periodic structure, processing the sample to prepare the three-dimensional periodic structure.

The invention discloses a coaxial double-beam welding method and coaxial double-beam welding equipment, and relates to the technical field of metal laser welding methods.The coaxial double-beam welding method comprises the following steps that S1, a to-be-welded workpiece is pretreated, and then the to-be-welded workpiece is fixed; s2, the continuous laser beam and the pulse laser beam are coaxially coupled into a composite laser beam, the spraying direction of molten pool shielding gas is adjusted, and the sprayed molten pool shielding gas is aligned to a molten pool; s3, the composite laser beam is adjusted, and the spot diameter d of the composite laser beam irradiating the molten pool is controlled; s4, the average output power and the defocusing amount of the continuous laser are set to be delta z2, the average output power and the defocusing amount of the pulse laser are set to be delta z2, and the frequency is f and the pulse width; and S5, welding is conducted, and meanwhile molten pool shielding gas is sprayed to the molten pool till welding is finished. Continuous laser and pulse laser are coaxially coupled to form a composite laser beam, the composite laser beam jointly acts on a molten pool, the temperature distribution gradient is accurately controlled by regulating and controlling the coaxial double-beam heat source state, and therefore the problem of thin plate welding deformation is solved.

The invention discloses a time sequence beam combining device based on laser nonlinear frequency conversion. The laser beam combining device comprises N light paths, N is larger than or equal to 2, and the first light path comprises a first nonlinear frequency conversion module used for converting fundamental frequency pulse laser into a first frequency conversion laser beam; each nth light path comprises a first double-color beam combiner and a first nonlinear frequency conversion module which are sequentially arranged along the light path, and the first double-color beam combiner is used for coaxially combining the incident fundamental frequency pulse laser of the light path and the (n-1) th frequency conversion laser beam from the (n-1) th light path; the first nonlinear frequency conversion module performs frequency conversion on the fundamental frequency pulse laser in the coaxial combined beam and obtains an nth frequency conversion laser beam with the repetition frequency of nf through an (n-1) th frequency conversion laser beam, n is greater than or equal to 2 and less than or equal to N, the N beams of fundamental frequency pulse laser have the same repetition frequency f, pulse sequences are not overlapped in time, and the n is greater than or equal to 2 and less than or equal to N; and the laser beam combining device outputs a beam-combined variable-frequency laser beam of which the repetition frequency is Nf and the wavelength is smaller than that of the fundamental frequency pulse laser beam.

The invention provides a laser-induced plasma visualization experiment platform and a use method. The laser-induced plasma visualization experiment platform comprises a laser-induced breakdown module, an image acquisition module and a control module, the laser-induced breakdown module comprises a laser used for emitting pulse laser, an attenuator, a beam compressor and a beam splitter are sequentially arranged in the pulse laser propagation direction of the laser, and a reflector, an amplification objective lens and a cuvette are arranged in the propagation direction of a beam of pulse laser split by the beam splitter; the image acquisition module comprises a high-speed camera and an ICCD (Intensified Charge Coupled Device) camera, and a lens of the high-speed camera and a lens of the ICCD camera are both compared with the cuvette; the control module comprises a computer control submodule and a signal generator, the computer control submodule is in communication connection with the signal generator, the high-speed camera and the ICCD camera, and the signal generator is in communication connection with the laser, the high-speed camera and the ICCD camera. According to the platform, the whole dynamic process of induced breakdown of nanosecond pulse laser in liquid is visualized.

The liquid-assisted micromachining methods include methods of processing a substrate made of a transparent dielectric material. A working surface of the substrate is placed in contact with a liquid-assist medium. A pulsed laser beam is generated and separated into a plurality of beamlets that are formed into a plurality of focus spots that have a fluence to induce multiphoton absorption in the transparent dielectric material. The plurality of focus spots are moved from an initial position in the liquid-assist medium through the substrate and simultaneously moved in one or more directions perpendicular to an optical axis so that each of the plurality of focus spots independently modifies the material along a separate modification path in a continuous volume of the transparent dielectric material. The continuous volume is removed from the substrate to form a feature in the substrate. Optical components formed using the processed substrate are also disclosed.

Disclosed is a method for cutting a metal-glass strip, comprising: applying a pulsed laser beam having a wavelength of less than or equal to 555 nanometers to the strip, the pulsed laser beam being formed from a series of pulses, each pulse having a duration of less than 10 picoseconds, and advantageously less than 1 picosecond, the crystallization temperature of the metal glass being less than 500 DEG C, and the light energy of the laser beam incident on the strip is between 1 microjoule / pulse and 10 microjoule / pulse.

A method for processing glass elements is provided. The method includes introducing a perforation line for parting a glass element introduced into the glass element during or after a hot processing process at an elevated temperature of at least 100° C. Spaced-apart filamentary flaws are introduced into the glass element along the predetermined course of the perforation line by a pulsed laser beam of an ultrashort pulse laser, and, during or after the introduction of the filamentary flaws, the glass element is cooled down so as to produce a temperature gradient, which induces a mechanical stress at the filamentary flaws, whereby the breaking force required for parting the glass element along the perforation line is reduced.

A spectral linewidth adjusting method includes: adjusting a timing of a first trigger signal for amplifying and converting a portion of a first pulse laser beam to a second pulse laser beam and / or a timing of a second trigger signal for amplifying and converting a portion of second continuous light to a third pulse laser beam and adjusting a spectrum of a fourth pulse laser beam obtained by performing sum-frequency mixing of the second and third pulse laser beams to a first spectrum in a non-Gaussian shape; and modulating a wavelength of the second continuous light within time corresponding to one pulse of the third pulse laser beam and adjusting the spectrum of the fourth pulse laser beam to a second spectrum having a spectral linewidth wider than the first spectrum through generation of a modulation signal for supplying the modulation signal to an optical phase modulator.

The invention provides a wafer composite scribing process. The wafer composite scribing process comprises the following steps that S1, a modified layer is formed in a wafer cutting channel through focusing of a pulse laser beam; s2, a blade is used for conducting scribing, scribing is conducted on the cutting channel laser marks generated in the step S1, and the newest surface cutting channel is formed under the condition that the modified layer is not cut through; s3, splitting is conducted in sequence along the newest surface cutting channel; a modified layer is formed in a wafer cutting channel through focusing of a pulse laser beam, then a blade is used for cutting into the interior of the cutting channel from the surface of the wafer, and the newest surface cutting channel is formed under the condition that the cutting channel is not cut through. And finally, sequentially carrying out chip splitting along the newest surface cutting channel to obtain a chip with a vertical cutting channel, a complete split chip, a standard size and no edge breakage.

The invention discloses an airport intelligent laser bird repelling system and method based on multi-sensor fusion, and relates to the technical field of airport safety protection, and the system comprises a flying bird coarse positioning module, a flying bird fine tracking module, a flying bird laser repelling module and a remote monitoring module. The flying bird coarse positioning module adopts a phased array millimeter wave radar to carry out wide area scanning on a designated area of an airport, and outputs coarse positioning coordinates of a flying bird. Then, the bird fine tracking module uses a laser scanning radar and a medium-wave infrared camera to cooperatively carry out high-precision tracking scanning on the bird in the target area, and outputs the three-dimensional coordinate of the bird in real time. The remote monitoring module displays an airport area map and a bird infrared image on an indoor console in real time, and provides a manual control interface for an operator at the same time. And finally, the bird laser repelling module controls a high-energy laser transmitter of the bird repelling machine to output a high-energy pulse laser beam to a bird body according to the three-dimensional coordinates of the bird, and the bird in the target area is accurately repelled.

A method can adjust an extreme ultraviolet (EUV) energy output of an EUV light generation system. The method can include irradiating a droplet with a pre-pulse laser beam suitable to reshape the droplet into a target. The method can further include irradiating the target with a rarefaction pulse laser beam suitable to modify one or more of a density of the target or an absorption characteristic of the target. The method can further include irradiating the modified target with a main pulse laser beam suitable to generate EUV light. The method can further include measuring an EUV energy output of the EUV light with a sensor. The method can further include adjusting at least one of the rarefaction pulse laser beam or the main pulse laser beam in response to the measured EUV energy output.

A method and system for generating deep ultraviolet (DUV) laser light is disclosed, in one embodiment the DUV laser system includes a fiber laser source configured to emit a poised fundamental laser beam in the near-infrared with a pulse duration of less than 400 femtoseconds (fs), a nonlinear crystal assembly comprising first, second, and third nonlinear crystals that is configured to convert the fundamental laser beam to produce a fifth harmonic laser beam having a wavelength in a range from 200 nanometers (nm) to 230 nm, and at least one compensation plate disposed in at least one position preceding at least one of the first, second, and third nonlinear crystals and configured such that a pair of pulsed laser beams transmitted through the at least one compensation plate are spatially and temporally overlapped within the at least one of the first, second, and third nonlinear crystals.

The invention provides a quantum bit addressing device, which comprises a laser generation assembly suitable for providing an initial pulse laser beam; the modulation component is suitable for modulating the initial pulse laser beam according to an externally input radio frequency signal so as to output a one-dimensional beam array comprising a plurality of laser beams with different diffraction angles; the optical waveguide chip is suitable for converting the one-dimensional light beam array into an addressing light beam array corresponding to the arrangement mode of the quantum bit array; the optical assembly is suitable for focusing the addressing light beam array to the quantum bit array so as to perform addressing control, measurement or trapping on at least one target quantum bit in the quantum bit array; wherein each addressing light beam in the addressing light beam array is in one-to-one correspondence with each quantum bit in the quantum bit array.

The invention provides an all-optical neural network system and an optical information processing method. The system comprises a pulse laser light source used for emitting a pulse laser beam; the digital micro-mirror device is used for loading the input image information and coding the input image information to the laser beam irradiated on the surface of the digital micro-mirror device; the phase modulation device is used for carrying out phase modulation on the laser beam which is emitted from the surface of the digital micromirror device and carries the input image information so as to form an optical signal with preset light intensity distribution on an output plane; the optical fiber delay line array device comprises an optical fiber delay line array and a beam combiner and is used for applying different time delays to the optical signals with preset light intensity distribution and combining and outputting the optical signals; the single-pixel high-speed detector is used for receiving the optical signal output from the optical fiber delay line array device and converting the optical signal into an electric signal at a high speed; and the signal acquisition and processing module is used for acquiring the electric signal to obtain one-dimensional pulse time domain waveform signal data so as to obtain input image information.

Provided is a pulse width expansion device for expanding the pulse width of a pulsed laser beam, the pulse width expansion device including a first optical pulse stretcher, a second optical pulse stretcher, a third optical pulse stretcher, and a fourth optical pulse stretcher disposed on the optical path of the pulsed laser beam, the first optical pulse stretcher, the second optical pulse stretcher, the third optical pulse stretcher, and the fourth optical pulse stretcher being disposed on the optical path of the pulsed laser beam. The optical path length of the delay optical path of the first optical pulse stretcher is L1, the optical path length of the delay optical path of the second optical pulse stretcher is L2, the optical path length of the delay optical path of the third optical pulse stretcher is L3, and the optical path length of the delay optical path of the fourth optical pulse stretcher is L4. When n is an integer of 2 or more, L2 is an integer multiple of 2 or more of L1, L3 satisfies (n-0. 75) * L1 < = L3 < = (n-0.25) * L1, and L4 satisfies (n-0.25) * L1 < = L4 < = (n + 0.25) * L1.