82 results about "Short pulse laser" patented technology

The invention relates to the technical field of anti-counterfeiting mark manufacturing and detection, in particular to a white spirit bottle cap anti-counterfeiting mark manufacturing method based on laser miniature carving and a detection device.The white spirit bottle cap anti-counterfeiting mark manufacturing method comprises the steps that S1, on the basis of the micro-nano optical principle, micro-nano structure parameters containing periodic grooves and protrusions are generated through algorithm optimization; s2, according to the micro-nano structure parameters, an engraving path file matched with ultra-short pulse laser equipment is generated; when the white spirit bottle cap anti-counterfeiting mark is used, through the micro-nano structure design and multi-angle dynamic information display, the anti-counterfeiting mark has extremely high complexity and uniqueness, the counterfeiting difficulty and the counterfeiting cost are greatly increased, the anti-counterfeiting performance of the white spirit bottle cap can be improved, the dynamic change characteristics of the anti-counterfeiting mark are captured through multi-angle imaging, and the anti-counterfeiting mark has good anti-counterfeiting effect. The micro-nano spectrum analysis module detects the authenticity of the micro-nano structure from the microscopic level, and the micro-nano spectrum analysis module and the micro-nano structure complement each other, so that the accuracy and reliability of detection can be remarkably improved, and the possibility of misjudgment and missed judgment can be reduced.

The application belongs to the technical field of semiconductor power devices, and particularly discloses a method for laser stripping gallium oxide. The method is characterized in that a super-short pulse laser with a predetermined wavelength is irradiated into the gallium oxide, and a two-photon absorption process occurs when the laser is focused at a position with a specific thickness from the surface. The high temperature generated in the process causes thermal decomposition of the gallium oxide, thereby achieving the purpose of stripping the gallium oxide. Compared with the traditional substrate cutting technology, the stripping method can significantly reduce the cutting consumption of the gallium oxide substrate, and the cut substrate can be reused after polishing, which helps to reduce the manufacturing cost of the gallium oxide device.

The application discloses a disk medium high-energy ultra-short pulse laser regenerative amplifier based on CPA technology, comprising: a femtosecond laser seed light source for providing femtosecond seed light; a chirped Bragg fiber grating for expanding the femtosecond seed light into nanosecond laser pulses; an optical coupling input and output device for coupling input of the nanosecond laser pulses and coupling output of the nanosecond laser pulses after amplification processing; a regenerative amplification laser cavity for regenerative amplification processing of the coupled-in nanosecond laser pulses; the optical coupling input and output device comprises a fiber coupling collimation module, an optical isolator, a first 1 / 2 wave plate and a thin film polarizer; the regenerative amplification laser cavity comprises a Pockels cell, a second 1 / 2 wave plate, a first reflection module, a second reflection module, a first telescope module, a second telescope module, a first disk gain medium, a second disk gain medium and a third reflection module; the regenerative amplifier can realize high-repetition-frequency and high-pulse-energy laser pulse output.

The disclosure relates to an optical system comprising a laser source (1) which generates pulsed laser radiation consisting of a temporal sequence of laser pulses in an input laser beam (EL), a splitting element (2) which follows the laser source (1) in the course of the beam and splits each of the laser pulses into laser pulse replicas separated spatially and / or temporally from one another, a combination element (4) which follows the splitting element (2) in the course of the beam and superimposes the laser pulse replicas in a respective laser pulse in an output laser beam. It is the task of the disclosure to provide an improved optical system compared to the prior art. It should be possible to generate particularly short and thus spectrally broadband laser pulses of high power with the optical system. The disclosure proposes that at least one multipass cell (3) is arranged in the beam path between the splitting element (2) and the combination element (4), through which the laser pulse replicas propagate, wherein the multipass cell (3) contains a medium in which the laser pulse replicas undergo nonlinear spectral broadening.

The invention provides an ultrashort pulse laser ceramic grading method and equipment for realizing the method. The method comprises the following steps: a) adopting an ultrashort pulse laser beam which is generated by a specific SESAM passive mode-locking seed laser and a regenerative amplifier and has the pulse width of 1-15 ps and the monopulse energy of 10 mu J-1 mJ; b) focusing the ultrashort pulse laser beam into a processing light spot with the light spot diameter of 5-50 microns through a light beam shaping transmission module; c) controlling the focused laser beam to perform grain-dividing path processing on the surface of the ceramic workpiece at a scanning speed of 10-1000 mm / s to realize grain-dividing joint cutting with a depth-to-width ratio of more than 10: 1; according to the method, the energy difference between single pulses is smaller than or equal to + / -2%, the difference of peak power between the pulses is smaller than or equal to + / -3%, and the method is stable in working performance, high in consistency, short in action time / low in damage and high in machining precision.

The present invention relates to a method and apparatus for processing a workpiece (4), in particular to a method and apparatus for imprinting an anti-glare function through a laser pulse (100) of a laser (1), wherein the apparatus comprises: a laser (1), in particular a short pulse laser or an ultrashort pulse laser, configured to provide a laser beam (10) including a laser pulse (100); a first diffusion lens (2) and a second diffusion lens (2'), each configured to scatter the laser beam (10) and imprint a locally randomized intensity distribution on the laser beam (10) at a focal plane (12), wherein the first diffusion lens (2) and the second diffusion lens (2') sequentially scatter the laser beam (10); and at least one optical focusing system (3) configured to focus the laser beam (10) onto a focal area (120) within a focal plane (12) on the workpiece (4), wherein the laser beam (10) is applied to the workpiece (4) and consequently the workpiece is processed. The invention includes a progression device (5) configured to move a laser beam (10) and a workpiece (4) by one step (V) relative to each other, wherein the progression device includes a scanner device (50) having a first scanner element (500) and a second scanner element (502), the movement of the scanner elements (500, 502) generates one step, the second scanner element (502) includes a second diffusion lens (2'), and the movement of the scanner elements changes a locally randomized intensity distribution.

The present application belongs to the technical field of laser and material interaction, and relates to a kind of optical element laser irradiation damage prediction method, system and terminal.The damage prediction method includes: establishing the three-dimensional geometric model of optical element, defining the material attribute parameter and environmental parameter of optical element, and constructing laser energy deposition function;With laser energy deposition function as laser heat source, a three-dimensional transient model of solid heat transfer and solid mechanics bidirectional coupling is constructed, and the boundary conditions of solid heat transfer and solid mechanics are set;Dynamic damage evolution equation is constructed, the laser irradiation surface of optical element is meshed, the solver is configured based on condition criterion, the current damage variable distribution is obtained by solving, the material attribute parameter is updated based on the current damage variable distribution, the damage variable distribution is continuously calculated after updating, until the preset termination condition is reached, and the damage prediction result is obtained.The present application can comprehensively and accurately predict the complex transient physical process of material under the action of high-repetition-rate short-pulse laser.

The invention discloses polycrystalline diamond defect detection and repair equipment and an intelligent repair method. The method comprises the following steps: preprocessing a to-be-processed area of a to-be-detected product, performing excitation scanning, obtaining distribution data of an internal fluorescence signal, and generating a fluorescence signal distribution diagram; carrying out image analysis on the fluorescence signal distribution diagram, identifying and positioning an abnormal fluorescence signal region in the fluorescence signal distribution diagram, constructing a three-dimensional coordinate model according to the abnormal fluorescence signal region, and processing by adopting ultra-short pulse laser processing equipment to form a repair channel; providing a repair alloy, and filling the repair alloy into the repair channel through a directional infiltration technology to realize metallurgical bonding repair of the internal defect area; an optical traceable signal detection mechanism is introduced into a polycrystalline diamond material, and an ultrashort pulse laser micro-channel processing and directional infiltration repairing process is combined, so that positioning and in-situ repairing of internal defects are realized, and the overall mechanical property of the material is effectively recovered; therefore, the service life of the product is obviously prolonged, and the machining reliability is improved.

The invention belongs to the technical field of laser manufacturing, and relates to a method for regulating and controlling an interface between laser reduction deposited metal and a transparent substrate, which comprises the following steps of: coating a precursor material on the surface of the transparent substrate, and irradiating the interface between the precursor material and the transparent substrate by adopting ultrashort pulse laser through the transparent substrate; and the ultra-short pulse laser scans the interface of the precursor material and the transparent substrate for multiple times according to a preset path for laser direct writing, and a patterned metal structure is obtained. The ultra-short pulse laser penetrates through the transparent substrate from the back to irradiate the precursor material / substrate interface, thickness limitation on the precursor material is avoided, and in the multiple laser scanning process, the temperature of the metal / substrate interface exceeds the chemical bond fracture and recombination temperature, so that more chemical bonds are formed on the two sides of the transition layer, and the performance of the transition layer is improved. The chemical bonding degree of a metal / substrate interface is improved, interface regulation and control of the metal and the transparent substrate are achieved, and a patterned metal structure is obtained.

The invention relates to a laser etching metal model establishing method considering short pulse laser shock peening. The method comprises the steps that thermal ablation and molten pool dynamics are coupled to establish a physical field of a laser etching part; a shock wave pressure model and a material constitutive model are introduced into the physical field of the laser etching part, and a multi-physical-field transient model is established; performing multi-objective optimization on the multi-physical field transient model, and replacing model parameters in the original model with optimized model parameters; by establishing a multi-physical field transient model coupling ablation and shock wave effects, synchronous and high-precision simulation of the laser shock peening effect in the process of etching the microgroove in the metal surface by short-pulse laser is realized; the limitation that shape control machining and performance strengthening are mutually separated in traditional simulation is overcome; understanding of an internal strengthening mechanism in the laser etching process is deepened, and an efficient digital design and prediction tool is provided for integrated process optimization of microgroove high-quality shape control and substrate fatigue performance improvement.

The application belongs to the technical field of ultra-short pulse laser, and particularly relates to a nonlinear fiber loop and full positive dispersion pump protection type 8-shaped cavity and a laser. The nonlinear fiber loop comprises a first circulator provided with three ports, a second circulator provided with three ports and a beam combiner. The first port of the first circulator is used to connect the third port of a coupler, the second port of the first circulator is connected with the third port of the second circulator, and the third port of the first circulator is connected with the output end of the beam combiner. The first port of the second circulator is used to connect the fourth port of the coupler through a first gain fiber, the second port of the second circulator is connected with the signal end of the beam combiner, and the first input end of the beam combiner is connected with a first pump light source.

The application provides a saturable absorption device, a preparation method and a low-threshold starting pulse mode-locked laser, and relates to the technical field of lasers. The application discloses a method for preparing a high-quality bismuth copper selenium oxide single crystal by a chemical vapor transport method, and a saturable absorption device prepared by simply using the high-quality bismuth copper selenium oxide single crystal can be applied to a pulse mode-locked laser, and can generate super-short pulse laser output, has high stability and a high signal-to-noise ratio, and has a low starting threshold.

Diamond through hole forming method and device based on laser coupling high pressure water jet, including the following steps: the diamond to be processed is fixed on a three-dimensional moving processing table, high energy density of an ultrashort pulse laser is used to realize non-thermal melting processing of the diamond, and an initial blind hole with a graphite residual layer is quickly formed on the diamond; a high pressure water jet mixed with a first oxidizing corrosion component is used to act on the initial blind hole, the graphite residual layer on the initial blind hole is removed, and the blind hole is reamed; a high pressure water jet containing a second oxidizing corrosion component is sprayed, and a nanosecond pulse laser is coupled to act on the reamed blind hole, a processing mode similar to water guide laser is formed, and a set through hole structure is obtained. The three-step method of laser direct drilling pretreatment, high pressure chemical water jet reaming processing and chemical assisted laser reaming polishing is adopted, rapid and high precision processing of the diamond through hole is realized, the processing efficiency, precision and quality are greatly improved, the cost can be reduced, and the method is environmentally friendly and efficient.

The invention discloses a gradient porous enhanced heat exchange plate with vertical microchannels and a preparation method thereof, and the preparation method comprises the following steps: stamping a substrate to form a required macroscopic flow channel; a metal gradient porous layer with the average pore diameter gradually decreasing from the side close to the base plate to the side away from the base plate is constructed on the surface of the base plate with the macroscopic flow channel through a thermal spraying technology; performing scanning etching on the surface of the metal gradient porous layer by adopting short pulse laser equipment to form a series of vertical micro-channels; and carrying out thermal diffusion treatment on the sheet in a protective atmosphere. According to the method, the process of stamping and then thermal spraying is combined with laser etching, high-temperature deformation of the substrate is avoided, capillary force and a steam escape path are optimized through a gradient aperture structure, and directional high-speed steam escape and interface metallurgical bonding are achieved through the vertical microchannel array and thermal diffusion treatment; therefore, the heat transfer coefficient, the critical heat flux and the structural reliability of the heat exchange plate are synergistically improved.

The application discloses a kind of magnesium lithium welding wire surface ultrafast laser pretreatment laser fuse device and method, including welding torch, welding wire supply device and fiber laser head, further include: fiber laser fuse manufacturing system, fiber laser fuse manufacturing system is used to output fiber laser, realize welding wire melting, the molten pool of stable welding piece additive process;Red-green laser layering cleaning system is used to output the high stability ultra-short pulse laser of triangular distribution, realizes the laser cleaning of magnesium lithium alloy welding wire surface;Cleaning process monitoring system is used for welding wire surface quality state feedback;Waste gas treatment system is used to collect the waste gas waste generated in cleaning process;Low-temperature atmosphere system is used to ensure that cleaning process is in low-temperature environment, avoid magnesium alloy dust spontaneous combustion.

The application provides a kind of laser repair system and method for annulus fibrosus injury based on gradient light spot and alternate pulse, belong to biomedical laser technology field, including: gradient light spot generation module is configured to generate annular light spot with energy gradient;Alternate pulse module is configured to generate and output alternate short pulse laser and long pulse laser;Minimally invasive operation integrated unit, its inside integrated gradient light spot generation module and alternate pulse module, and be configured to adapt minimally invasive operation scene;Gradient light spot generation module and alternate pulse module cooperate to realize laser repair to annulus fibrosus injury.The application realizes the layered accurate repair of annulus fibrosus injury by the synergistic effect of gradient light spot generation module, alternate pulse module and minimally invasive operation integrated unit, avoids tissue thermal injury while improving repair effect, and adapts minimally invasive operation scene.

This application relates to the field of non-stick titanium cookware technology, and in particular to a surface treatment method for an uncoated non-stick titanium cookware based on a multi-level micro-nano composite structure. The method includes the following steps: Step 1: After heating the raw material of the cookware body sheet, it is placed on an embossing machine. The embossing machine embosses the raw material of the cookware body sheet, creating different patterns inside the cookware. The embossed raw material is then stretched through a mold to form a preliminary shape of the cookware body. Then, a stamping machine is used to close the edges of the raw material and perform multiple embossing processes to create a layered texture, forming the cookware body. In this application, titanium metal makes the entire non-stick cookware lighter and easier to use. The pure aluminum intermediate layer increases heat conduction efficiency, improving the non-stick effect. Multiple polishing processes make the surface of the non-stick cookware smoother, enhancing its non-stick performance and appearance. Micropores are etched on the surface of the cookware body using an ultra-short pulse laser device, achieving the non-stick effect.

The invention relates to a device and a method for processing a workpiece (4) by means of laser pulses (100) of a laser (1), in particular for imparting an anti-glare function, the device comprising: a laser (1), in particular a short-pulse laser or an ultra-short-pulse laser, which is configured to provide a laser beam (10) with laser pulses (100); a first scattering sheet (2) and a second scattering sheet (2'), each of which is configured to scatter the laser beam (10) and to impart a locally randomized intensity distribution to the laser beam (10) in a focal plane (12), wherein the first scattering sheet (2) and the second scattering sheet (2') successively scatter the laser beam (10); at least one focusing optic (3), which is configured to focus the laser beam (10) onto a focal region (120) in the focal plane (12) on the workpiece (4), wherein the workpiece (4) is subjected to the laser beam (10) and is thus processed; a feed device (5), which is configured to move the laser beam (10) and the workpiece (4) relative to one another with a feed (V), wherein the feed device comprises a scanner device (50) with a first scanner element (500) and a second scanner element (502), wherein the movement of the scanner elements (500, 502) generates the feed, wherein the second scanner element (502) comprises the second scattering sheet (2'), wherein the movement of the scanner elements changes the locally randomized intensity distribution.

An optical imaging system according to an embodiment disclosed in the present document may include: a laser module configured to radiate an ultrashort pulse laser beam; a microscope module configured to transmit the radiated ultrashort pulse laser beam to an eye of a subject and detect reflected light from the eye or (auto)fluorescence in the eye using an image sensor; a control module configured to generate a tau-related image in which a modification of tau proteins is detectable from the reflected light detected through the image sensor; and an output device configured to display the tau-related image.

The invention provides a high repetition frequency pulse train ultrashort pulse laser reduction direct writing method, which is applied to the technical field of laser processing and comprises the following steps: preparing precursor ink which comprises metal salt or metal oxide, polyhydric alcohol, deionized water and a dispersing agent; coating the precursor ink on the surface of a transparent substrate to form a liquid film; according to the target metal pattern, performing reduction direct writing on the surface of the transparent substrate by adopting ultra-short pulse laser of a high-repetition-frequency pulse string; and washing and blow-drying redundant precursor ink on the surface of the transparent substrate through deionized water and ethyl alcohol respectively, and obtaining a target metal pattern on the surface of the transparent substrate. According to the method, the heat influence of the substrate is effectively reduced, and the applicability of the laser direct writing technology based on the photothermal effect to different transparent substrate materials is expanded.

A diffractive optical element, such as a plasma grating, can be made by directing two laser beams so that they overlap in a nonlinear material to form an interference pattern in the nonlinear material. The interference pattern can modify the index of refraction in the nonlinear material to produce the diffractive optical element. This diffractive optical element may be used to separate the peak of a laser pulse from light preceding the peak thereby increase the temporal contrast of a laser pulse such as a compressed laser pulse.

The invention discloses short pulse laser cutting equipment applied to semi-penetrating cutting of a composite material, and relates to the technical field of laser cutting. An inclined through groove is formed in the supporting plate, a rubber gasket ring is clamped to the inclined through groove of the supporting plate, an empty groove frame is slidably installed at the inclined through groove of the supporting plate, the top of the empty groove frame is higher than the top of the supporting plate, and the supporting plate is matched with the empty groove frame, air in the inclined through groove is pumped through an air pump, and an air pressure difference is generated between the air and the outside; during sliding, the empty groove frame is pushed by atmospheric pressure through the material to obliquely slide downwards in the oblique through groove, meanwhile, in the sliding process, the material is pulled and flattened towards the two sides while oblique sliding is conducted through adsorption between the empty groove frame and the bottom of the material, and meanwhile the bottom of the material is tightly attached to the top of the supporting plate; and the situation that the distance between the top of the material and the laser cutter is different, so that the cutting depths of different positions are different in the semi-penetrating cutting process, and the semi-penetrating cutting quality is affected is avoided.

The invention discloses a high-quality and high-efficiency thinning processing method for a laser lift-off semiconductor. According to the method, the semiconductor substrate is subjected to dual-stage laser treatment by using short pulse laser, so that surface undulation can be quickly removed and efficiently thinned. The first-stage laser treatment is used for removing surface fluctuation of the stripping surface and forming a modified structure convenient for subsequent processing, and the second-stage laser treatment is used for thinning the substrate to a target thickness. And the substrate subjected to laser treatment is finely thinned through the grinding wheel, so that the thickness of a damaged layer is effectively reduced, and the surface quality and the subsequent processing efficiency are improved. The method is suitable for substrates made of hard and brittle materials such as silicon carbide, gallium nitride and diamond, has the advantages of being high in thinning efficiency, small in damage, low in cost and high in applicability, and remarkably optimizes the overall processing flow of the semiconductor substrate.

A method includes emitting an ultra-short pulse laser beam from a laser source. The method also includes forming the laser beam into a plurality of discrete beams via an optical array, where intersecting discrete beams form a structured light pattern comprising a plurality of voxels. A first subset of the plurality of voxels defining a line and a second subset of the plurality of voxels lie outside the line. The method also includes forming a plurality of voids in a substrate by aligning the structured light pattern onto the substrate, each voxel of the plurality of voxels forming a discrete void in the substrate, each void separated by the substrate. The method includes, after forming the plurality of voids in the substrate at a plurality of different positions, forming an article by separating one portion of the substrate from a base portion of the substrate.

A time to angle camera sorting system that uses a short pulsed laser, a lens, an array of DMDs, a camera, and a processor. As the laser illuminates the space before it, DMDs turn on and off between their tilt angles, and diffracted light is returned and captured. The light data is sent to the processors which are programmed, configured, or structured to map the time of arrival of the light data with the angle data of the DMDs associated with each light data point, and then process an image based on the mapped time to angle mapped data.

This invention discloses an impact fabrication method for interlayer particle-reinforced composite structures in metals, belonging to the field of composite material preparation and laser processing technology. The method includes: providing a metal matrix and a metal flyer; pre-forming a particle layer on the side of the metal flyer facing the metal matrix; coating an absorption layer and covering it with a constraint layer; irradiating the surface of the flyer with a short-pulse laser to induce high-voltage plasma driving the flyer to impact the matrix at high speed, causing the particle layer to be pressed into the matrix surface, while simultaneously achieving solid-state welding between the flyer and the matrix at the particle gaps to form a particle-reinforced composite layer; repeating the above steps layer by layer to obtain a multilayer particle-reinforced metal matrix composite structure. This invention introduces a particle-reinforcing phase at the metal interlayer interface, achieving uniform distribution and firm embedding of particles, avoiding harmful interfacial reactions, and can prepare multilayer gradient composite structures of the same and different metals. This method has a wide process window and broad material adaptability, applicable to aerospace, electronic packaging, wear-resistant components, and other fields.

The invention discloses a Raman grating magneto-optical trap gravimeter realized by pulse laser. The Raman grating magneto-optical trap gravimeter comprises a central controller, a coherent laser generator and a grating magneto-optical trap gravimeter, the central controller controls the coherent laser generator and is used for outputting control voltage so as to control operation of the seed light laser, the optical fiber electro-optical modulator, the pulse laser generator, the multi-stage optical fiber amplifier and the optical fiber acousto-optic modulator. The seed light laser outputs continuous laser to be injected into the optical fiber electro-optical modulator; the optical fiber electro-optical modulator adopts a radio frequency signal to modulate input continuous laser and then injects the continuous laser into the pulse laser generator; the pulse laser generator continuously converts laser into short-pulse laser and injects the short-pulse laser into the multi-stage optical fiber amplifier; a frequency doubling crystal after short pulse laser amplification; frequency is increased and converted into the required laser wavelength, the laser wavelength is injected into the optical fiber acousto-optic modulator, and the output of the optical fiber acousto-optic modulator is injected into the grating magneto-optical trap gravimeter. The device is simple in structure and low in cost, and the research, development, production and application cost of the device is reduced.

The invention relates to a picosecond laser vision self-adaptive intelligent cutting method for an OLED screen body, and the method comprises the steps: obtaining the surface image data of a to-be-cut OLED screen body in real time, and recognizing the actual contour features and position; generating a self-adaptive cutting path matched with the individual features of the OLED screen body in combination with a preset target cutting graph and the recognized actual contour features and positions; according to the self-adaptive cutting path, a picosecond laser cutting head is driven to conduct positioning, and a picosecond laser is started to generate an ultra-short pulse laser beam; and laser cutting operation is carried out on the OLED screen body along the self-adaptive cutting path, so that the purpose of improving the cutting precision, quality and adaptability of the special-shaped screen is achieved.