81 results about "Nanosecond laser" patented technology

The invention provides an infrared femtosecond and infrared nanosecond laser combined machining system and a bionic machining method, and relates to the technical field of laser surface machining. According to the method, rapid rough machining and pre-structure construction are achieved through nanosecond laser, then fine modification and micro-nano structure regulation and control are conducted through femtosecond laser, the machining efficiency and the structure quality can be remarkably improved through the synergistic effect of the nanosecond laser and the femtosecond laser, meanwhile, the heat influence is reduced, high-precision and low-damage machining of the SiC surface is achieved, and the machining quality is improved. And a technical support is provided for constructing a surface structure with special functionality.

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 application relates to a substrate with micro-nano composite texture and a preparation method and application thereof, and belongs to the technical field of biological medicine. The preparation method comprises the following steps: S1, adopting a nanosecond laser to perform texture treatment on pretreated metal titanium, forming micro texture on the surface of the metal titanium, and obtaining micro texture metal titanium; S2, uniformly stirring ammonium fluoride in ethylene glycol, then uniformly stirring water in the ethylene glycol, and obtaining an electrolyte; S3, connecting the positive pole of a direct current power supply to the micro texture metal titanium as an anode, connecting the negative pole of the direct current power supply to a platinum electrode as a cathode, and performing magnetic field assisted anodic oxidation treatment on the micro texture metal titanium in the electrolyte, so that nano texture is formed on the surface of the micro texture metal titanium; and after cleaning and drying, a substrate with micro-nano composite texture is obtained. The substrate is applied to a drug-loaded coating of a metal implant, can realize micro-nano multi-scale cooperation, integrates the macrostructure advantage of the micron texture and the surface characteristics of the nanotube, and greatly improves the comprehensive performance of the drug-loaded coating.

The utility model relates to the field of stainless steel plate coloring equipment, in particular to a workbench for nanosecond laser coloring equipment, which comprises a frame and a cooling and supporting integrated device installed through the frame, the cooling and supporting integrated device comprises a plurality of branch pipelines, a plurality of supporting pieces are installed on the branch pipelines at intervals, and the supporting pieces are connected with the frame. A discharge port is formed in the part, between every two adjacent supporting pieces, of the branch pipeline, and the discharge ports are formed upwards; one end of each branch pipeline is closed, the other end of each branch pipeline is communicated with the main pipeline, the branch pipelines are connected in parallel, and the main pipeline is connected with a cooling medium source. By means of the working table, cooling treatment can be provided for the stainless steel plate in the treatment process, and meanwhile the interference influence on suction and collection work of dust particles of a dust removal structure above the working table can be avoided.

The invention relates to a method for displaying latent fingerprints based on nanosecond laser preparation and oxide film transfer. Belongs to the field of latent fingerprint development. The method comprises the following steps that a transparent material is attached to metal, nanosecond laser penetrates through the transparent material and irradiates the surface of the metal through multi-line scanning, the metal is subjected to phase change, generated metal oxide molten particles are attached to the surface of the transparent material, and a compact metal oxide layer is formed. The oxide layer is arranged above the latent fingerprint, and after laser multi-line scanning, the oxide film and the transparent material interface form a high-voltage area. Through heat conduction, the oxide attached to the latent fingerprint is heated to be subjected to phase change, is driven by high pressure to be transferred to the surface of the fingerprint, is in contact with a latent fingerprint sample at a relatively low temperature and then deposits to push the molten mass to the surface of the latent fingerprint, and the molten mass deposits to form a film. But as skin secretions are attached to the ridge line, the deposition capacity of a molten mass is weak, the contrast ratio of the skin secretions and the molten mass is enhanced, and fingerprints appear. The method has the advantages of simplicity in operation, no pollution, low cost and the like. The method has potential application prospects in the criminal investigation field.

The application discloses a kind of for CFRP big depth-diameter ratio array hole multi-pulse width laser composite processing system and method.The system includes: multi-pulse width laser generation module, for outputting two initial laser beams;Beam shaping module, for the optical axis of two initial laser beams is adjusted to coaxial, the initial laser beam is shaped, adjusts the polarization state of initial laser beam, initial laser beam is modulated into two sub laser beams, adjusts the energy distribution of two sub laser beams, two sub laser beams are converted into two mirror image symmetrical distribution in the focusing laser beam array of two sides of the CFRP matrix to be processed.The application can be applicable to the high-efficiency high-precision processing of CFRP big depth-diameter ratio array hole, and nanosecond laser is used to improve processing efficiency, and femtosecond laser is used to effectively inhibit carbon fiber delamination and thermal damage of resin matrix.

This invention relates to an atomic-level manufacturing method and apparatus for two-dimensional metal oxide nanosheets based on controllable micro-explosion, belonging to the field of functional nanomaterials and atomic-level precision manufacturing technology. This invention uses transition metal energetic complexes and energetic oxygen compounds as metal-oxygen integrated precursors. Under the constraint of an array-type nano-confined microcavity, controllable micro-explosions are synchronously triggered by nanosecond lasers to achieve nanosecond-level stoichiometric precision in the directional self-assembly of two-dimensional metal oxide nanosheets. The preparation cycle of this invention is reduced to less than 10 minutes, and the overall energy consumption is less than 1% of that of the traditional hydrothermal method. The product has excellent specific surface area, photocatalytic and cycling performance, and is 100% compatible with existing mass production lines. It is suitable for large-scale manufacturing in fields such as photocatalysis, energy storage, gas sensors, and environmental governance.

This invention discloses a two-dimensional infrared spectroscopy system and its detection method that combines acid-base step and pulsed heating. The system includes a femtosecond laser, an optical parametric amplifier and difference frequency generator, a frequency divider, an electronic time delay generator, a nanosecond laser, a detachable optical parametric oscillator providing 355nm light pulses, an optical parametric oscillator providing 2020nm light pulses, a monochromator and a mercury cadmium telluride array detector, an integrator and data acquisition card, a computer, a chopper, a time-resolved pulse generation chamber, and a sample chamber. This invention retains the original pulsed heating trigger mode by using a nanosecond light source with a detachable optical parametric oscillator providing 355nm light pulses. It achieves convenient switching between the acid-base step and pulsed heating modes through a dichroic mirror and a reversible reflector. Before and after switching, the propagation direction of the nanosecond pulses is completely consistent, and the relative time delay is corrected by the electronic time delay device.

The invention relates to the technical field of lasers, in particular to a multi-wavelength output nanosecond laser. The laser comprises a pumping source, a pumping coupling device, a pumping end mirror, a gain crystal, a Q-switching device, a turning mirror, a frequency tripling crystal, a frequency doubling crystal and a tail end mirror. A pumping source, a pumping coupling device, a pumping end mirror, a gain crystal, a Q-switching device and a turning mirror are sequentially arranged in the light emitting direction of the pumping source. A turning mirror, a frequency tripling crystal, a frequency doubling crystal and a tail end mirror are sequentially arranged along the reflection direction of the turning mirror; the tail end mirror is a plane mirror, the end face, facing the frequency doubling crystal, of the tail end mirror is plated with a fundamental frequency light partial reflection film and a frequency doubling light high reflection film, and the transmittance of the fundamental frequency light partial reflection film is 2%-98%. The multi-wavelength output nanosecond laser provided by the invention can synchronously output multi-wavelength nanosecond laser with adjustable power pulse width by controlling the transmittance of the film layer of the output lens at the tail end.

The invention discloses a humidity-driven soft actuator and a preparation method thereof, the actuator takes a patterned black polyimide (PI) film as a substrate, and the substrate is compounded with two-dimensional transition metal carbide Ti3C2Tx (MXene) / amylopectin amp; a functional layer is formed by Amylose / carbon nanotubes (CNTs), when the functional layer absorbs moisture and expands, the actuator is bent towards the PI side, and when the functional layer is dehumidified and contracts, the actuator is bent reversely; the bending response direction is defined through the substrate gap direction of nanosecond laser machining, and the initial curvature and the bending degree are regulated and controlled through vacuum hot pressing treatment. The components cooperate to endow the actuator with rapid humidity response capability and excellent mechanical stability. The technical problems that an existing humidity driving actuator is poor in programmability and an interface is prone to stripping are solved, an external driving source is not needed, the technology is simple, convenient and controllable, and the potential application value in the fields of soft robots, flexible intelligent equipment and the like is shown.

The invention provides a space propulsion method of a nanosecond-femtosecond composite light filament, which is used for solving the problem of low long-distance laser propulsion efficiency. The method specifically comprises the following steps: forming a kilometer-level length filament through a space filament forming principle of femtosecond laser, stabilizing the power density at 1013-1015W / cm < 2 > magnitude by utilizing a light intensity clamping effect, and realizing dozens of kilometer-level low-loss energy transmission; meanwhile, the transmission direction of the nanosecond laser is adjusted through the optical lens group, the formed nanosecond filament and the femtosecond laser are coaxially transmitted or transmitted at a certain angle and act on the same position, a plasma channel generated by the filament enables the transmission loss of the high-energy nanosecond laser to be greatly reduced, and the energy absorption of the target material to the nanosecond laser is remarkably improved; therefore, the surface of the target material is melted, gasified and even ionized in an extremely short time, a large number of high-speed reverse-spraying plasma plumes are generated, and high specific impulse and thrust are obtained. The method is suitable for various target materials, and precise control over the thrust, the specific impulse and the propelling direction can be achieved by regulating and controlling laser parameters.

The invention discloses a nanosecond laser precision machining method for a SiCf / SiC composite material, and belongs to the field of laser machining and advanced composite material manufacturing. The method comprises the following steps: carrying out linear ablation or surface ablation on a pretreated SiCf / SiC composite material by adopting nanosecond pulse laser with the wavelength of 355 nm; the laser energy density, the scanning speed, the scanning times, the line overlapping ratio and the scanning path are optimized through the system, and high-precision and low-damage machining is achieved. The core optimization parameters are as follows: the laser energy density is 5.33 J / cm < 2 >, the scanning speed is 200mm / s, the line overlapping rate is 66.58%, and a one-way scanning mode is adopted. Through the combination of experiments and simulation, the mechanism (melting, evaporation, decomposition, and material removal by liquid drop splashing and gas volatilization) of nanosecond laser ablation of SiCf / SiC is disclosed, the heat affected zone, the oxidation phenomenon and the recondensate defect are effectively controlled, the quality and the contour precision of the machined surface are remarkably improved, and the machining precision is improved. The method is suitable for micromachining of key components such as aerospace engine hot end components and medical high-end equipment.

The invention provides nanocrystalline surface hardened austenitic stainless steel and a preparation method thereof.The microstructure of the stainless steel is an isomerous austenitic structure wrapped by nanometer isometric crystals, and the preparation method of the nanocrystalline surface hardened austenitic stainless steel comprises the following steps that firstly, the austenitic stainless steel plate is subjected to low-temperature cross rolling deformation treatment, and rolling deformation in different directions is controlled; inducing to form deformation-induced martensite strip structures which are uniformly distributed and mutually crossed; then a rapid heating technology is used for enabling deformation to induce the martensite to inversely change into hardened austenite; then nanosecond laser melting treatment is conducted on the surface of the stainless steel plate, so that nano-sized isometric crystals are obtained on the surface; and finally, the steel plate subjected to laser melting is subjected to warm rolling deformation treatment, residual tensile stress introduced to the melting surface is converted into pressure stress, and the surface corrosion resistance is further improved while the yield strength of the steel plate is improved. While the yield strength of the austenitic stainless steel is improved, good corrosion resistance and plasticity can also be considered.

The preparation method comprises the following steps that firstly, an austenitic stainless steel plate is subjected to cross warm rolling treatment, and the yield strength of the steel plate is improved; then, the surface of the steel plate is subjected to remelting treatment through high-frequency pulse nanosecond laser combined with an ultra-fast cooling technology, and 280-510 nm isometric crystals are formed on the surface of the steel plate; and finally, stress relief annealing is conducted on the workpiece obtained after laser melting, residual stress generated in the laser melting process is eliminated, the plasticity of experimental steel is guaranteed, and finally the high-strength corrosion-resistant austenitic stainless steel is obtained.

The application discloses a kind of magnetic particle film and preparation method thereof.The preparation method of the magnetic particle film of the application comprises: quartz matrix is subjected to metal vapor vacuum arc ion implantation process, laser annealing process, to obtain magnetic particle film.The application obtains the preparation method of the magnetic particle film suitable for transparent substrate, simple process, effective magnetic modification, small and uniform particle size, high controllability and good repeatability by combining metal vapor vacuum arc ion implantation technology with nanosecond laser annealing, and setting and controlling by specific process parameters.Moreover, the magnetic particle film with sub-10 nanometer particle size and uniform distribution can be prepared by the above method, which has wide application prospect in high-density magnetic recording, micro-magnetic sensor and the like.

The invention provides a nickel-based superalloy surface cleaning method, and relates to the technical field of alloy surface treatment. In the inert atmosphere, nanosecond laser cleaning is carried out on the nickel-based superalloy. The method provided by the invention is a gas-assisted nanosecond laser cleaning method for the high-temperature alloy surface, the cleaning mode is a non-contact cleaning process, the alloy surface does not need to be contacted during working, and surface oxides and oil stains can be effectively removed by strictly controlling the conditions of the nanosecond laser cleaning process, so that the alloy surface is not damaged; alloy deformation and hot cracks cannot be caused; meanwhile, in the laser cleaning process, inert gas is utilized to enable the treated sample to be in an inert gas protection environment, oxygen is prevented from making contact with the alloy surface to cause secondary oxidation pollution, and the alloy quality is guaranteed; in addition, accurate and efficient cleaning can be achieved in the specified position and the specified area of the surface of the special-shaped part, meanwhile, no chemical cleaning agent is needed in the cleaning process, and the method is safer and more environmentally friendly.

This invention relates to a method for simultaneously enhancing the mechanical and optical properties of reactive sintered silicon carbide (RB-SiC) using laser irradiation, belonging to the field of ceramic material surface modification technology. The method includes the following steps: cleaning, grinding, polishing, and drying the RB-SiC surface; and irradiating the RB-SiC surface with a nanosecond laser in a nitrogen atmosphere to obtain surfaces with different micro / nano structures and silicon-based nitride contents. Adjusting the silicon-based nitride content can increase the surface hardness of RB-SiC, with a maximum increase of 44.6%. Furthermore, the formation of silicon-based nitrides with high refractive index and unique micro / nano structures reduces the surface reflectivity of RB-SiC from over 20.8% in the 200-2500 nm wavelength range to 1%, a reduction of 95.2% compared to the original surface. The method of this invention has the advantages of simple operation, high efficiency, and low cost. This method can simultaneously achieve an increase in the surface hardness and a decrease in reflectivity of RB-SiC, facilitating its practical application as a surface functional material.

The invention relates to the technical field of metal processing, and discloses a titanium chopstick head laser surface hardening method, a controller and a hardening device.Chopsticks with titanium chopstick heads are vertically fixed in a containing groove through a fixing clamp, and heat conduction liquid is injected into the containing groove so that the parts, except for the titanium chopstick heads, of the chopsticks can be placed in the heat conduction liquid; adjusting the focus of a nanosecond laser galvanometer in the laser assembly to be aligned with the titanium chopstick head, controlling the nanosecond laser galvanometer to scan the surface of the titanium chopstick head according to preset laser parameters, and hardening the surface of the titanium chopstick head; controlling a ceramic wafer in the test assembly to scratch the hardened titanium chopstick head, and detecting scratches on the ceramic wafer; if the scratch is not detected, the fixing clamp is loosened, so that the chopsticks sink into the bottom of the heat conduction liquid and enter a containing area arranged at the bottom of the containing groove. The titanium chopstick head has the beneficial effects that the technical effect of improving the structural compactness of the oxidation layer is achieved, and the oxidation layer can still ensure that the titanium chopstick head does not fade after tens of thousands of friction experiments.

The invention discloses a dental implant laser processing system and method, the dental implant laser processing system is used for processing a microgroove structure on a dental implant, the dental implant laser processing system comprises a first light path assembly, a second light path assembly, a beam combining assembly and a processing head, the first light path assembly is used for outputting femtosecond laser; the second light path assembly is used for outputting nanosecond laser; the beam combining assembly is located on a transmission path of the femtosecond laser and the nanosecond laser so as to realize space coupling of the femtosecond laser and the nanosecond laser; the machining head is located on the light emitting path of the beam combining assembly and used for enabling the femtosecond laser and the nanosecond laser to act on the dental implant to be machined, and a microgroove structure is machined. The machining precision and the precision of the microgroove structure are improved, no subsequent machining procedure is needed, the machining cost is reduced, and the machining efficiency is improved.

The application relates to the field of micro-nano processing technology, in particular to a system, a method and an application for preparing a flexible transparent electrode by nanosecond laser processing, the system comprising: a laser emission module for emitting a nanosecond laser beam; a galvanometer deflection module for deflecting the nanosecond laser beam; a water bath cooling module for placing a film material, one side of the film material being in contact with water in the water bath cooling module, and the other side being etched by the deflected nanosecond laser beam; and an ultrasonic module for ultrasonic cleaning of the etched film material. The flexible transparent grid-shaped electrode is prepared by the combination of laser etching, galvanometer deflection, water bath cooling and finally ultrasonic burr removal, the transparent grid-shaped electrode has the characteristics of high conductivity, high light transmittance and excellent mechanical flexibility, and the requirement for equipment is reduced and the production cost is greatly reduced.

The utility model provides a time-domain double-pulse delay-adjustable high-power nanosecond laser, which comprises a passive Q-switched resonant cavity, a single-lamp double-rod amplification module, a first single-lamp single-rod amplification module, a second single-lamp single-rod amplification module, a light beam collimation module, a half-wave plate and a delay light path control module which are sequentially arranged, the centers of the single-lamp double-rod amplification module, the first single-lamp single-rod amplification module, the second single-lamp single-rod amplification module, the light beam collimation module, the half-wave plate and the delay light path control module are arranged on the same horizontal line. According to the utility model, laser pulse output with adjustable time-domain double-pulse laser delay time is realized, intelligent regulation and control of the double-pulse laser delay time are effectively realized, and the ubiquitous problems of low energy utilization rate and generation of plasma shielding effect in traditional laser shock peening are improved.

The application relates to a two-dimensional van der Waals heterojunction one-step synchronous manufacturing method and device based on controllable micro-explosion, and belongs to the technical field of two-dimensional heterojunction devices and atomic-level precision manufacturing. The application adopts layered nanometer limited microcavities and multi-channel layered liquid injection technology, prepares corresponding material-energy integrated precursors for each layer of the heterojunction, synchronously triggers controllable micro-explosion through nanosecond laser, and realizes in-situ formation of the two-dimensional van der Waals heterojunction with no defects and clean interfaces between layers in one step, and the complex process of traditional layer-by-layer growth + transfer is completely abandoned. The application compresses the heterojunction preparation cycle from tens of hours to within 10 minutes, the interface flatness is Ra<0.3nm, 100% compatible with existing semiconductor production lines, and is suitable for large-scale manufacturing in the fields of advanced logic chips, quantum devices, radio frequency devices and the like.

The application provides a vacuum electroplating process and an electroplating device using nano silver ions to improve efficiency, which comprises the following steps: placing silver pieces into water, obtaining nano silver glue by irradiating with nanosecond laser pulses; adding a surfactant to the nano silver glue and obtaining highly dispersed nano silver particles by laser pulses; introducing argon gas with a certain pressure into a vacuum chamber, performing laser treatment on the surface of a substrate by pulse laser; adding the nano silver particles into the vacuum chamber, performing vacuum magnetron sputtering on the substrate, and projecting the focused laser pulses onto the surface of the required electroplating position of the substrate, so as to obtain an electroplated part; spraying a protective film on the electroplated surface of the electroplated part; performing laser treatment on the surface of the substrate by using pulse laser, then performing vacuum magnetron sputtering on the substrate, and projecting the focused laser pulses onto the surface of the required electroplating position of the substrate, so as to accurately lock the electroplating position and effectively improve the electroplating efficiency.

The application discloses a super-hydrophobic coating and a preparation method and application thereof, wherein PDMS is mixed with a curing agent to configure a PDMS solution; then PTFE microparticles are mixed with the PDMS solution, ultrasonic dispersion is carried out, and spin coating is carried out on a substrate surface; vacuumizing, drying and solidifying are carried out to form, and then nanosecond laser processing is carried out to obtain the super-hydrophobic coating. The application adds the PTFE microparticles in the PDMS solution, improves the power generation effect, reduces the light transmittance of the friction layer, makes nanosecond laser processing on the coating surface feasible, and ensures that the super-hydrophobic friction layer prepared by laser processing can keep excellent power generation effect of the friction nanogenerator in a high-humidity environment.

The application provides a laser texturing device and method for improving the adhesion of gear end face to lubricating oil, the device comprises a rack, the upper surface of the rack is marked as an experimental platform, a positioner and a controller are placed on the experimental platform, the experimental platform is equipped with a lifting mechanism, a gear to be processed is installed on the chuck of the positioner, the controller can control the start and stop of the positioner and the rotation of the chuck, the lifting mechanism can drive the laser head to move up and down to realize the focusing of laser on the gear end face, the laser head is connected with a nanosecond laser through an optical fiber, the laser head and the nanosecond laser are connected with the controller, the nanosecond pulse laser emitted by the nanosecond laser is incident to the laser head, and the nanosecond pulse laser is emitted after sequentially passing through a collimating and expanding mirror, an X-Y scanning galvanometer and a focusing mirror in the laser head; the gear at the chuck is subjected to laser texturing treatment through the nanosecond pulse laser from the laser head. The device and method can reduce the escape of lubricating oil from the gear end face and the gasket.

The invention discloses a multi-layer nanosecond laser galvanometer glass punching technology. The technology comprises the following steps that firstly, equipment debugging is conducted; 2, preparing materials; thirdly, laser drilling is conducted; step 4, performing subsequent treatment; wherein in the third step, debugged equipment is used, and a two-section method or a multi-section process is adopted for punching machining; according to the invention, the laser drilling process is changed into two or more sections from the original one-time drilling of a hole with the thickness of the whole glass, a higher rising speed and higher laser power are set at the front section of the drilling, and another group of drilling parameters is replaced when the distance between the drilling hole and the upper surface of the glass is 0.5-1mm: the lower laser power is selected, the rising speed is reduced, and the drilling speed is reduced; therefore, generation and accumulation of heat are reduced, the purpose of reducing surface edge breakage is achieved, and the machining efficiency is guaranteed; and during product switching, the positions of the suction cups on the suction cup frame are adjusted, positioning of different products can be rapidly completed, and the variety switching machining process is more convenient and faster.