396 results about "Pulsed laser beam" patented technology

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 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.

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 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 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.

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 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.

The present invention relates to a method and to a device for correcting the shape of an optical component (1) using pulsed laser radiation. For this purpose, the component (1) is measured and excess material (7) is determined by way of comparison with a target geometry (6) and is at least partially removed by machining using at least one pulsed laser beam (4) with pulse durations of > 1 μs in order to at least approximate the actual geometry (5) to the target geometry (6). During machining, the component (1) is rotated at a rotational speed about an axis of rotation, wherein the distance of the laser beam (4) to the axis of rotation is changed at least temporarily. The rotational speed, the beam diameter of the laser beam (4) on the component (1) and the temporal pulse interval between the pulses of the laser beam (4) are selected such that material regions of the component (1) removed by successive pulses of the laser beam (4) do not overlap.

The present application relates to the field of metal protection technology and specifically discloses a method for coating a titanium aviation fastener with a molybdenum disulfide protective layer, comprising the following steps: S1. Fastener surface treatment: polishing the fastener surface to obtain a fastener with a surface roughness of 0.05-0.07 microns, cleaning it with an organic solvent, and then using a pulsed laser beam to form a honeycomb micropore array on the material surface with a pore size of 5-10 μm and a depth of 20-50 μm, thereby obtaining a pre-treated fastener; S2. Molybdenum disulfide coating: applying the molybdenum disulfide coating to the pre-treated fastener surface, storing it at room temperature for 12 hours, and then coating it with a hydrophobic protective layer; S3. Room temperature curing: curing the fastener coated with the hydrophobic protective layer at room temperature for 4-6 hours to obtain. The method of the present application can be used for surface protection of titanium aviation fasteners and has the advantages of good wear resistance and corrosion resistance.

The invention relates to a method and a device for regulating and controlling the structure performance of a nickel-based high-temperature alloy in pulse laser-assisted additive manufacturing, and belongs to the technical field of additive manufacturing. The method comprises the following steps: controlling the oxygen content in a sealed forming cabin of an LPBF forming device, and paving nickel-based high-temperature alloy powder on a substrate of the sealed forming cabin; and the pulse laser and the continuous laser are controlled to output laser beams, the pulse laser beams and the continuous laser beams are coupled in a polarization beam combination or wavelength beam combination mode, and after the focal length of the coupled laser beams is adjusted, the nickel-based superalloy powder on the substrate is subjected to fusion forming. According to the method, the pulse laser and the continuous laser are coupled into the coaxial light spots, in-situ synchronous disturbance on the molten pool in the LPBF additive manufacturing process is achieved, the solidification behavior of the nickel-based high-temperature alloy can be accurately regulated and controlled, epitaxial growth of columnar crystals is effectively broken, formation of fine isometric crystals is promoted, and the yield of the nickel-based high-temperature alloy is improved. And the anisotropy and cracking risk of the material can be reduced.

The invention relates to the technical field of resin material processing, in particular to a method for preparing a laser cladding metal coating on the surface of a resin-based material, which comprises the following steps of: pulse laser cladding: synchronously sending a metal cladding material to a position right below a pulse laser beam, so that the metal cladding material forms high-speed molten drops and is sprayed to the surface of the resin-based material; a metal cladding layer is formed after cooling; wherein the pulse width of the pulse laser beam ranges from 0.2 ms to 1000 ms, the power of the pulse laser beam ranges from 50 W to 200 W, and the feeding rate of the metal cladding material ranges from 3 particles per second to 8 particles per second. The problem that the resin-based material is easily damaged when a traditional laser cladding technology is applied to the metallization modification process of the surface of the resin-based material can be solved.

An autocorrelator and a pulse amplifying device including the same are provided. The autocorrelator includes a parabolic mirror configured to transmit and reflect pulse laser beam, a prism on one side of the parabolic mirror and configured to split the pulse laser beam, a first lower retro-reflector under the prism and provided at a first distance from the prism to reflect a portion of the pulse laser beam, a first upper retro-reflector on the prism, provided at a second distance different from the first distance from the prism, and configured to reflect another portion of the pulse laser beam to generate a first time difference between pulses of the pulse laser beam upper retro-reflector, and a first sensor under the parabolic mirror and configured to receive the pulse laser beam to detect a pulse width of the pulse laser beam.

A pulse width extension system, a laser apparatus, and a method of manufacturing an electronic device are provided. A pulse width expansion system according to one aspect of the present disclosure expands the pulse width of an incident pulse laser beam and emits the pulse laser beam, the pulse width expansion system comprising: a pulse width expansion optical system configured to include a beam splitter and a plurality of mirrors; a housing that houses the pulse width expansion optical system; at least one target configured so as to be able to discriminate a portion irradiated with the pulsed laser light; and a target movement mechanism capable of disposing the at least one target on an optical path of the pulse laser light including the pulse width expansion optical system and retracting the at least one target from the optical path.

The invention relates to the technical field of quantum sensing and optical instruments, and discloses integrated equipment for representing nitrogen vacancy color center quantum characteristics and sensing sensitivity, which comprises a laser module, an inverted optical microscope module, an electronic control and data acquisition module and a system software control module, the laser module realizes continuous laser beam output or pulse laser beam output through light path selection; the inverted optical microscope module receives the laser beam and collects the nitrogen vacancy color center of the sample, and selectively guides fluorescence to the confocal single photon counting branch or the analog signal detection branch through the light path selection mechanism; the electronic control and data acquisition module is responsible for driving each device and processing signals from different detection branches; and the system software control module cooperates with each module to execute quantum characteristic characterization and sensing sensitivity evaluation tasks. Through deep integration of software and hardware, dual-mode measurement is realized on a single platform, and the device has the advantages of high function integration level, compact structure, convenience in operation and high measurement efficiency.

The invention discloses a metal fatigue damage detection method based on double-grating laser ultrasonic multi-parameter measurement, and relates to the technical field of metal fatigue damage detection. According to the invention, a double-cycle transient grating is formed on the surface of a to-be-detected metal material by using a pulse laser beam modulated by a double-spacing slit mask, so that double-frequency high-strength resonant ultrasonic surface wave non-contact excitation is realized, and an ultrasonic surface wave signal is acquired through a laser interferometer based on the non-contact excitation. And performing fast Fourier transform on the measurement signal to obtain frequency spectrum information of the measurement signal, and detecting the metal fatigue damage according to multiple laser ultrasonic characteristic parameters extracted from the frequency spectrum information. Ultrasonic detection on the surface of the metal material to be detected is achieved through an all-optical means, the effects of no damage, complete non-contact and high accessibility are achieved, and the detection precision and resolution of local fatigue damage are improved.