306 results about "Pulsed laser beam" patented technology

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 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.

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.

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.

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.

A biological information detection device is disclosed that includes a first laser oscillator that oscillates a first pulsed laser beam adapted for detection of a lactic acid or lactic acid salt; a second laser oscillator that oscillates a second pulsed laser beam adapted for detection of a pyruvic acid; an irradiation mechanism that emits the first pulsed laser beam and the second pulsed laser beam to blood; a light receiving sensor that receives a detected laser beam output from the blood; and a control unit. The control unit outputs oscillation instructions for oscillating the first pulsed laser beam and the second pulsed laser beam, cuts out detected signals provided from the light receiving sensor as time segment data for time periods, and calculates respective quantities of the lactic acid or lactic acid salt and the pyruvic acid in the blood based on the time segment data.

The invention relates to a hard light resisting method of a laser radar and related equipment. The method comprises the following steps: controlling a laser receiving module to acquire an optical signal within the exposure time after a laser transmitting module transmits a pulse laser beam according to the current exposure time, and converting the optical signal into an electric signal; extracting a bottom noise value according to the electric signal; if the current exposure time is the ith-gear exposure time and the bottom noise value is greater than or equal to an upshift threshold value from the ith gear to the (i + 1) th gear, taking the (i + 1) th-gear exposure time as the target exposure time; if the current exposure time is the jth-gear exposure time and the bottom noise value is smaller than or equal to a downshift threshold value from the jth gear to the (j-1) th gear, taking the (j-1) th-gear exposure time as target exposure time; wherein the upshift threshold value corresponding to the smaller-gear exposure time is higher than the downshift threshold value corresponding to the adjacent larger-gear exposure time. According to the invention, the complex environment adaptability of the sweeping robot is improved.

Laser processing device (40) comprising: a clamping table (54) which holds a wafer (10) having a front side (10a) and a back side (10b); a laser beam application means (44) that applies a laser beam to the wafer (10) which is held by the clamping table (54); and a processing feed means (43) that performs a relative processing feed of the clamping table (54) and the application means (44) for a laser beam, wherein the application means for a laser beam comprises a laser oscillator (44b) which oscillates a pulsed laser beam, and a focusing device (44a) which focuses the pulsed laser beam oscillated by the laser oscillator (44b) in order to apply the pulsed laser beam to the wafer (10) which is held by the clamping table (54), and The pulsed laser beam, oscillated by the laser oscillator (44b), includes burst pulses (BP), each of which has several subpulses that are gradually amplified stepwise from a lower energy to a high energy, and the burst pulses (BP) are applied to the wafer (10) to form shielding tunnels (100), each containing a small hole (102) and an amorphous phase (104) surrounding the small hole, wherein the application means (44) is configured for a laser beam to form a circular small hole (102) and a circular amorphous phase (104), each extending from the front side (10a) to the rear side (10b) of the wafer (10), wherein the focusing device (44a) is movable in the direction of the optical axis and configured such that the focal point is positioned at a predetermined position in the wafer (10). is.

The present invention provides an inspection device that inspects the internal condition of an object being measured from its back surface. [Solution] The inspection device comprises a holding means, an ultrasonic vibration generating means 40, an ultrasonic vibration capturing means 70, and an image generating means 110. The ultrasonic vibration generating means comprises an oscillator 41 that emits a pulsed laser beam LB1, and a fiber bundle 43 composed of multiple rings in which multiple optical fibers are arranged in multiple rings of different diameters that form concentric circles. The length of the optical fibers constituting the fiber bundle is formed to increase from the configuration of a large ring with a large diameter that forms the concentric circles to the configuration of a small ring with a small diameter that forms the concentric circles. The pulsed laser beam is first irradiated onto the upper surface of the object to be measured from the optical fibers constituting the large ring, and then the pulsed laser beam is gradually irradiated onto the upper surface of the object to be measured from the optical fibers constituting the small ring with a time difference, thereby focusing the ultrasonic vibration at a desired internal position of the object to be measured.

The invention relates to laser processing, and provides a laser melting and strengthening combined processing system which comprises a continuous laser device, a laser processing device, a laser processing device, a laser processing device and a laser processing device, and is characterized in that the continuous laser device is used for generating continuous laser beams and melting powder materials through a melting light path; the ultrafast laser is used for generating an ultrafast pulse laser beam and carrying out strengthening processing on the surface of the product subjected to melting processing through a strengthening light path; and the galvanometer assembly is used for receiving the continuous laser beam guided out by the melting light path and the ultrafast pulse laser beam guided out by the strengthening light path. The invention further provides a laser melting and strengthening combined machining method. According to the combined machining system, the continuous laser is firstly adopted for 3D printing, then the ultrafast laser is adopted for strengthening the printing surface, the mechanical strength of a printed piece can be effectively improved, the ultrafast laser and the continuous laser share the galvanometer assembly, and space arrangement of a printing cavity is facilitated.

The present invention discloses a laser-arc hybrid welding device and welding method for aluminum alloys. The device comprises a laser generating device, a non-melting inert gas shielded arc welding gun, and a metal active gas shielded welding gun. The non-melting inert gas shielded arc welding gun adopts a direct current positive connection, while the metal active gas shielded welding gun adopts a direct current reverse connection. The angle between the non-melting inert gas shielded arc welding gun and the laser beam is 25° to 45°. Along the welding direction, the non-melting inert gas shielded arc welding gun is in front, and the metal active gas shielded welding gun is in the back. The laser beam is a variable power square wave pulse laser beam, and the power ratio of high-power laser pulses to low-power laser pulses is 2:1. This design improves energy utilization, increases the single-shot penetration depth of the weld and the welding speed, and simultaneously reduces workpiece assembly requirements, improves weld quality, and improves weld formation.

A fluid nanoparticle measuring device according to an exemplary embodiment of the present invention may include: a flow cell configured to allow flow of a liquid sample containing nanoparticles; a laser generating unit that irradiates the flow cell with a pulsed laser beam; a flow control unit that controls the flow of the liquid sample within the flow cell; and a signal detection unit that detects a signal from a plasma generated in the flow cell by the pulsed laser beam, wherein the signal detection unit includes a spectrometer that performs spectral analysis of the light signal from the plasma to obtain information about the nanoparticles.

The invention relates to a method for producing a polymorphic or pseudo-polymorphic crystalline phase from a plurality of compounds (C, D, S1, S2), the method comprising steps of preparing (I) a supersaturated solution from the compounds, homogenizing (II) the supersaturated solution in an ultrasonic bath, transferring (III) the supersaturated solution into a plurality of heated tubes (54), aging (V) the solutions transferred into the tubes for a predetermined period of time, exposing the tubes (54) to a polarized pulsed laser beam before and / or during exposure, followed in situ by nucleation and then growing cocrystals inside the tubes (54), and filtering the exposed solutions in order to recover cocrystals having a size greater than a predetermined minimum size. This method is carried out in order to obtain cocrystallization from at least one active substance (D) and a coformer (C) in at least a first solvent (S1) and a second solvent (S2).

The invention provides an isotope quantitative analysis method and system based on laser-induced breakdown spectroscopy, and relates to the technical field of laser spectrums.The method comprises the steps that a liquid analysis environment is constructed according to the form of a sample to be detected; focusing a pulse laser beam in the liquid analysis environment to ablate a sample to be detected so as to generate plasma; collecting an emission spectrum signal generated in the plasma cooling process; and extracting an isotope characteristic spectral line of a target element from the emission spectrum signal, and carrying out isotope quantitative analysis based on spectral line information of the isotope characteristic spectral line. According to the device and the method, spectral line broadening and self-absorption can be effectively inhibited in mechanism, the resolution ratio of the isotope spectral line is remarkably improved, the device is simple, the cost is low, and a reliable and economical solution is provided for realizing high-performance isotope in-situ and rapid quantitative analysis in the fields of nuclear industry and the like by a laser-induced breakdown spectroscopy technology.

A time imparting method for imparting a time to two or more pieces of pulse data of a laser apparatus that burst-oscillates a pulse laser beam, includes causing a first processor including a real-time system to receive a first light emission trigger signal from a laser irradiation device and to measure a time interval between a previously received second light emission trigger signal and the first light emission trigger signal in the real-time system, and causing a second processor to receive the time interval from the first processor, and when the time interval is smaller than a set value, to impart a time obtained by adding the time interval to a time imparted to pulse data of a pulse laser beam corresponding to the second light emission trigger signal, to pulse data of a pulse laser beam corresponding to the first light emission trigger signal.