Abstract

A divided-pulse laser regeneration amplification apparatus includes: a signal light coupling component including a first half-wave plate, a first polarization beam splitter, a first Faraday rotator and a second half-wave plate placed in sequence; and a divided-pulse laser regeneration amplification component including a second polarization beam splitter and a third reflector, the second polarization beam splitter is adjacent to the second half-wave plate and is in a same column as the third reflector and the second half-wave plate; a first quarter-wave plate, a Pockels cell and a first reflector are successively arranged on a first side of the second polarization beam splitter, and a third half-wave plate, a first pulse polarization separation component and a first non-linear pulse amplification component are successively arranged on a second side of the second polarization beam splitter.

IPC Classes  ?

• H01S 3/102 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
• H01S 3/06 - Construction or shape of active medium
• H01S 3/08 - Construction or shape of optical resonators or components thereof
• H01S 3/081 - Construction or shape of optical resonators or components thereof comprising three or more reflectors

Abstract

The present disclosure provides a self-similar regenerative amplification method and an apparatus. The apparatus includes a broadband seed source, a spectrum shaping broader, a self-similar regenerative amplifier and a pulse compressor disposed in order of a light path. The spectrum shaping broader includes a time domain broader and a spectrum shaper. The time domain broader is configured to broaden the seed pulses, and fine-tune a width of the seed pulse. The spectrum shaper is configured to perform spectrum shaping on the broadened pulses to obtain saddle chirped pulses. The pulse regenerative amplification component includes a gain crystal and a nonlinear crystal. The self-similar regenerative amplifier receives the saddle chirped pulses, performs multiple stepwise amplifications and multiple nonlinear spectrum broadenings back and forth on the saddle chirped pulses, and output high-energy chirped pulses to the pulse compressor.

IPC Classes  ?

• H01S 3/00 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
• H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
• H01S 3/16 - Solid materials

Abstract

The present disclosure provides a method of an ultrafast-pulsed laser deposition and a device thereof, wherein a single emitted femtosecond pulse is split, and the split pulses are synchronized in the time domain, and then coupled with each other to form a plasma grating or lattice to excite the target material once; then multiple pulsed lasers are sequentially coupled multiple times with the plasma gratings or lattices to excite the target material multiple times, and the excited target material is deposited and reacted on the substrate to form a thin film.

IPC Classes  ?

• C23C 14/28 - Vacuum evaporation by wave energy or particle radiation
• C03C 17/22 - Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating with other inorganic material
• C23C 14/06 - Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material

Abstract

A pulsed laser deposition method is provided. The method includes emitting a plurality of groups of femtosecond pulses, focusing the plurality of groups of femtosecond pulses into a plurality of groups of femtosecond filaments by lenses, and cross-coupling the plurality of groups of femtosecond filaments to form n beams of plasma gratings; exciting a target material by using a first plasma grating; and adjusting angles of the lenses and time delay between a plurality of beams of femtosecond pulses; coupling and splicing a second plasma grating with the first plasma grating along a grating pattern of the first plasma grating, until a nth plasma grating is coupled and spliced with a (n−1)th plasma grating along a grating pattern of the (n−1)th plasma grating to form a plasma grating channel; and exciting the target material by using the plasma grating channel to complete deposition on a substrate.

IPC Classes  ?

• C23C 14/28 - Vacuum evaporation by wave energy or particle radiation
• C23C 14/54 - Controlling or regulating the coating process

Abstract

A method for film coating by pulsed laser deposition with a plasma grating includes: in step 1, providing a substrate and a target material; in step 2, generating a femtosecond pulsed laser beam which is split by a beam splitting module so as to form a plurality of femtosecond pulsed laser sub-beams; in step 3, performing a first excitation on the target material by one of the split femtosecond pulsed laser sub-beams as a pre-pulse after focus, to generate a first plasma; in step 4, synchronizing the rest of the split femtosecond pulsed laser sub-beams as post-pulses to form, after focus, filaments arriving at a surface of the target material simultaneously, to generate the plasma grating; and in step 5, performing a secondary excitation on the target material by the generated plasma grating to generate a second plasma depositing on the substrate to form the film.

IPC Classes  ?

• C23C 14/28 - Vacuum evaporation by wave energy or particle radiation
• C23C 14/54 - Controlling or regulating the coating process

Abstract

A processing method and apparatus for ultrafast laser deposition of a multilayer film including a diamond-like carbon film, an anti-reflection film and an anti-fingerprint film includes: generating primary plasma by first excitement on a target material with a femtosecond or picosecond pulsed laser beam as a pre-pulse; and generating secondary plasma by second excitement on the target material under plasma grating, formed by allowing two femtosecond pulsed laser beams to intersect at a small include angle for interaction in the primary plasma, for deposition to coat a film.

IPC Classes  ?

• C23C 14/28 - Vacuum evaporation by wave energy or particle radiation
• C23C 14/06 - Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
• C23C 14/02 - Pretreatment of the material to be coated
• C23C 14/54 - Controlling or regulating the coating process
• C03C 17/42 - Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating of an organic material and at least one non-metal coating

Abstract

A photocatalytic material includes activated carbon, titanium dioxide, zinc oxide, graphene, tourmaline powders, a nano-copper solution, carvacrol and deionized water. The photocatalytic material is prepared by mixing the activated carbon, the titanium dioxide, the zinc oxide, the graphene, the tourmaline powders, the nano-copper solution, the carvacrol and the deionized water for a period ranging from 1 to 12 hours. A photocatalytic air screen filter for epidemic prevention includes a substrate and the photocatalytic material. The photocatalytic material is applied on a surface of the substrate, and the photocatalytic material is dried and cured. An amount of the material loaded on the surface of the substrate is in a range of 0.1 to 100 mg/cm2.

IPC Classes  ?

• B01D 53/88 - Handling or mounting catalysts
• B01J 35/00 - Catalysts, in general, characterised by their form or physical properties
• B01J 37/00 - Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
• B01J 21/18 - Carbon
• A61L 9/22 - Ionisation
• A01N 59/16 - Heavy metals; Compounds thereof
• A01N 31/08 - Oxygen or sulfur directly attached to an aromatic ring system
• B01J 21/06 - Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
• F24F 8/167 - Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using catalytic reactions
• B01D 53/86 - Catalytic processes
• B01D 46/00 - Filters or filtering processes specially modified for separating dispersed particles from gases or vapours

Abstract

Provided are a nonlinear polarization filtering method, device, and apparatus. The device comprises a pump source, a coupler, a birefringent medium, and several polarizers; wherein the pump source is applied to output a pump laser, so as to make a photo-induced birefringence effect occur at the birefringent medium; the polarizer is applied to polarize a signal light according to a preset polarizing angle; and the coupler is applied to couple the pump laser and the signal light into the birefringent medium, wherein an angle except 0° exists between the birefringent medium and the preset polarizing angle of the polarizer.

IPC Classes  ?

• G02B 27/28 - Optical systems or apparatus not provided for by any of the groups , for polarising
• H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
• G02F 1/39 - Non-linear optics for parametric generation or amplification of light, infrared, or ultraviolet waves

Abstract

A frequency stabilizing system for high precision single-cavity multi-frequency comb includes a single-cavity multi-comb pulse oscillator, a frequency detection system, and a frequency feedback control system. The single-cavity multi-comb pulse oscillator is configured to output mode-locked pulse trains with a certain repetition rate difference at two or more central wavelengths. The frequency detection system is configured to detect the frequency signal, and output the corresponding electrical signal. The frequency feedback control system is configured to process the electrical signal from the frequency detection system, and transmit it to the frequency response component in the single-cavity multi-comb pulse oscillator to control a strain of the frequency response component, so as to realize feedback control on the frequency (repetition rate, repetition rate difference, and carrier envelope offset frequency) of the mode-locked pulse trains.

IPC Classes  ?

• H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
• H01S 3/1112 - Passive mode locking
• H01S 3/00 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
• H01S 3/137 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
• H01S 3/16 - Solid materials

Abstract

A method for preparing a core-shell structure photocatalytic material includes: obtaining a titanyl sulfate solution by mixing and reacting sulfuric acid and metatitanic acid; obtaining a mixed solution by adding a porous material having a hydrophilic surface into the titanyl sulfate solution; adding an alkali into the mixed solution to obtain a precipitation product by reacting the alkali with the titanyl sulfate coated on the surface of the porous material; and filtering, washing, drying and calcining the precipitation product to obtaining a core-shell structure photocatalytic material with the porous material as a core and a mesoporous quantum titanium oxide as a shell.

IPC Classes  ?

• B01J 21/06 - Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
• B01J 21/18 - Carbon
• B01J 29/06 - Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
• B01J 21/16 - Clays or other mineral silicates
• B01J 35/00 - Catalysts, in general, characterised by their form or physical properties
• B01J 35/10 - Solids characterised by their surface properties or porosity
• B01J 37/04 - Mixing
• B01J 37/03 - Precipitation; Co-precipitation
• B01J 37/02 - Impregnation, coating or precipitation
• B01J 37/00 - Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
• B01J 37/06 - Washing
• B01J 37/08 - Heat treatment

Abstract

A high-precision repetition rate locking apparatus for an ultra-fast laser pulse includes: an electronic controlling component comprising: a standard clock, configured to provide a high-precision frequency standard; a pulse generator (PG), configured to provide an electrical pulse signal with adjustable repetition rate, pulse width and voltage magnitude; and a signal generator (SG), connected to the standard clock and the PG, and configured to provide a stable frequency signal for the PG, a phase-shift adjusting component, connected to the electronic controlling component and configured to implement phase modulation through electrically induced refractive index change; a resonant cavity component, comprising a phase shifter, a doped fiber, a laser diode, a wavelength division multiplexer and a reflector, and configured to generate a mode-locked pulse; and a detection system, configured to measure a repetition rate of an output pulse.

IPC Classes  ?

• H01S 3/11 - Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
• H01S 3/091 - Processes or apparatus for excitation, e.g. pumping using optical pumping
• H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude

Abstract

A mid-infrared upconversion imaging method and a mid-infrared upconversion imaging device are provided, which are used for imaging detection in a mid-infrared wavelength band, and related to a technical field of infrared imaging. The method includes directing pump laser and mid-infrared light into a chirped crystal component located in an optical cavity to obtain visible light; and imaging an object with the visible light.

IPC Classes  ?

• H04N 5/33 - Transforming infrared radiation
• H04N 5/225 - Television cameras

Abstract

A hyperspectral imaging method includes: providing time-domain synchronous mid-infrared ultrashort pulse and near-infrared ultrashort pulse as pump light and signal light, respectively; subjecting the signal light to optical time-stretching to broaden a pulse width of the signal light; directing the time-stretched signal light to a target sample to be detected; directing the pump light to a time delayer to adjust the time when the pump light reaches a silicon-based camera; spatially combining the time-stretched signal light from the target sample with the pump light from the time delayer; directing combined light to a silicon-based camera where the signal light is detected through non-degenerate two-photon absorption of the signal light under the action of the pump light to acquire hyperspectral imaging data; and obtaining an image of the target sample based on the hyperspectral imaging data.

IPC Classes  ?

• G01N 21/35 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light

Abstract

An electrically tunable non-reciprocal phase shifter, an electrically tunable polarization filter, a NALM mode-locked laser and a Sagnac loop are provided. The electrically tunable non-reciprocal phase shifter includes a modulation crystal device, a birefringent crystal device, a Faraday rotator, and a fiber coupler. The phase shifter is configured to couple two beams of light to a fast axis and a slow axis of the modulation crystal device, respectively; and change a refractive index difference between the fast axis and the slow axis to introduce different phase delays for the two beams of the light, so as to control a non-reciprocal linear phase shift amount between the two beams of the light.

IPC Classes  ?

• H01S 3/08 - Construction or shape of optical resonators or components thereof
• G02B 27/28 - Optical systems or apparatus not provided for by any of the groups , for polarising
• H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
• G02F 1/21 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference

Abstract

A multipulse-induced spectroscopy method based on a femtosecond plasma grating includes: pre-exciting a sample on a stage by providing a femtosecond pulse to form the femtosecond plasma grating; providing a post-pulse on the sample at an angle to excite the sample to generate a plasma, wherein the post-pulse comprises one or more femtosecond pulses, there is a time interval between the femtosecond pulse and the post-pulse, and the time interval is less than a lifetime of the femtosecond plasma grating; and receiving and analyzing a fluorescence emitted from the plasma to determine element information of the sample.

IPC Classes  ?

• G01N 21/71 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
• G01J 3/18 - Generating the spectrum; Monochromators using diffraction elements, e.g. grating
• G02B 27/10 - Beam splitting or combining systems

Abstract

A process for preparing a graphene quantum material includes: providing a carbon-containing precursor; decomposing the carbon-containing precursor with ultra-fast laser to obtain the graphene quantum material; optionally reducing graphene oxide into graphene with laser; and optionally subjecting the graphene quantum material to microwave heating.

IPC Classes  ?

• C01B 32/194 - After-treatment

Abstract

A detection method based on laser-induced breakdown spectroscopy enhanced by a two-dimensional plasma grating includes: generating a femtosecond laser pulse by a femtosecond laser, and splitting the femtosecond laser pulse into three sub-pulses by a beam splitting unit; focusing the three sub-pulses separately by a focusing unit to allow focused sub-pulses to be overlapped at an intersection in space, wherein before reaching the intersection, the three sub-pulses form two planes; synchronizing the three sub-pulses in a time domain by adjusting optical paths of the three sub-pulses in such a way that they have the same optical length and the three sub-pulses arrive at the intersection in space simultaneously and form the two-dimensional plasma grating; and exciting a sample on a stage based on the two-dimensional plasma grating to generate a plasma cluster, and acquiring a spectrum of the sample.

IPC Classes  ?

• G01N 21/71 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
• G01N 21/01 - Arrangements or apparatus for facilitating the optical investigation
• G01N 21/64 - Fluorescence; Phosphorescence

Abstract

An ecosystem for deep water environment restoration includes: a light-collecting device; an underwater lighting system connected to the light-collecting device and configured to provide light to a deep water layer of a water body; a photocatalytic bionic net comprising a photocatalytic material and a fiber and placed in the deep water layer; and an aquatic plant. When the photocatalytic material receives the light, the photocatalytic material is able to adsorb organic pollutants of the water body to the photocatalytic bionic net and catalyze degradation of the organic pollutants of the water body, concentrate microorganisms to allow the microorganisms to decompose the organic pollutants into nutrients required for growth of the aquatic plant, and absorb the light to catalyze decomposition of water to produce oxygen. When the aquatic plant receives the light, the aquatic plant is able to perform photosynthesis to release oxygen.

IPC Classes  ?

• C02F 1/30 - Treatment of water, waste water, or sewage by irradiation
• C02F 1/72 - Treatment of water, waste water, or sewage by oxidation

Abstract

The present disclosure provides an electrode material and a method for preparing the same. The electrode material includes 3 to 7 wt % of a graphene material, 4 to 8 wt % of a photocatalytic nano-material, 3 to 9 wt % of a binder system, and a balance of a glass fiber cloth, based on a total weight of the electrode material. The method includes providing a graphene-based precursor solution; The present disclosure provides an electrode material and a method for preparing the same. The electrode material includes 3 to 7 wt % of a graphene material, 4 to 8 wt % of a photocatalytic nano-material, 3 to 9 wt % of a binder system, and a balance of a glass fiber cloth, based on a total weight of the electrode material. The method includes providing a graphene-based precursor solution; agitating and dispersing a glass fiber cloth to obtain an uniform slurry; wet forming the slurry to obtain a glass fiber sheet, and cleaning and drying the glass fiber sheet; putting the glass fiber sheet into the graphene-based precursor solution for in-situ synthesis to obtain a glass fiber paper; and immersing the glass fiber paper with a binder system and drying the glass fiber paper to obtain the electrode material.

IPC Classes  ?

• H01M 4/583 - Carbonaceous material, e.g. graphite-intercalation compounds or CFx
• H01M 4/36 - Selection of substances as active materials, active masses, active liquids
• H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• H01M 4/80 - Porous plates, e.g. sintered carriers
• H01M 4/48 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
• H01M 4/04 - Processes of manufacture in general

Abstract

A fiberglass filter element includes: 6 to 12 wt % of zinc oxide-based composite photocatalytic nanoparticles; 3 to 9 wt % of an adhesive system; and 79 to 91 wt % of a superfine fiberglass cotton. The zinc oxide-based composite photocatalytic nanoparticles includes: a rod-like or flower-like zinc oxide photocatalytic nanoparticle (A); a photocatalytic nanoparticle (B), which is one or more selected from graphene, graphene oxide, reduced graphene oxide and graphene quantum dots; a photocatalytic nanoparticle (C), which is one or more selected from a silver nanoparticle and a silver nanowire; and a photocatalytic nanoparticle (D), which is one or more selected from titanium oxide, tin oxide and tungsten oxide.

IPC Classes  ?

• C03C 3/093 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium containing zinc or zirconium
• C03C 13/04 - Fibre optics, e.g. core and clad fibre compositions
• A61L 9/20 - Ultraviolet radiation
• B01D 39/20 - Other self-supporting filtering material of inorganic material, e.g. asbestos paper or metallic filtering material of non-woven wires

Abstract

Provided is a method for preparing a graphene material from an industrial hemp material by laser induction, which uses a skin, a stem and/or a root of industrial hemp as a carbon precursor-containing material and reduce the carbon precursor-containing material into graphene by laser induction, so as to prepare graphene, graphene quantum dots, a graphene mesoporous material and a graphene composite material.

IPC Classes  ?

• C01B 32/184 - Preparation
• B01J 19/12 - Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves

Abstract

A method for preparing a boron carbide material includes: providing raw materials of a boron material, a carbon material and a rare earth oxide, wherein an element molar ratio B:C of the boron material to the carbon material is in a range of 4:1 to 4:7, and the rare earth oxide is in an amount of 5 wt % or less based on a total weight of the raw materials, mixing and milling the raw materials to obtain a mixture, compressing the mixture into a tablet form by a tablet press, and sintering the compressed mixture by a laser, wherein the laser has a laser wavelength of 980 nm, a laser power in a range of 100 to 3000 W, and a laser irradiation time of 3 to 60 s.

IPC Classes  ?

• C04B 35/563 - Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on carbides based on boron carbide
• C04B 35/626 - Preparing or treating the powders individually or as batches
• C04B 35/634 - Polymers
• C04B 35/638 - Removal thereof

Abstract

A method for preparing an infrared radiation ceramic material includes mixing and ball milling raw materials of Fe2O3, MnO2 and CuO in a mass ratio to obtain a mixed powder; pressing the mixed powder; adjusting laser spot, laser power and laser sintering time of a laser; irradiating or sintering by a first laser the pressed mixed powder in a crucible for a high-temperature solid-phase reaction to obtain an AB2O4 type ferrite powder; obtaining a first mixture by mixing the AB2O4 type ferrite powder and a cordierite powder in a mass ratio; adding a sintering aid and a nucleating agent for ball milling; obtaining a second mixture by mixing the first mixture and a binder for aging; pressing the second mixture; and irradiating or sintering the pressed second mixture by a second laser to obtain the infrared radiation ceramic material.

IPC Classes  ?

• C04B 35/26 - Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on ferrites
• C04B 41/00 - After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
• C04B 35/645 - Pressure sintering

Abstract

A Raman spectrometric imaging method, including: placing a sample on a two-dimensional translation stage; emitting a first light beam by a first optical comb light source; dividing the first light beam into a pump light beam and a depletion light beam to illuminate the sample; guiding the pump light beam to illuminate a region of the sample to excite molecules of the sample in the region; guiding the depletion light beam to the region of the sample to make excited molecules at a periphery of the region to return into a vibrational ground state; emitting a second light beam as a probe light beam by a second optical comb light source to the remaining excited molecules to generate a CARS signal; recording the CARS signal for imaging; moving the two-dimensional translation stage to scan other regions of the sample to form an image of the sample.

IPC Classes  ?

• G01J 3/44 - Raman spectrometry; Scattering spectrometry
• G01N 21/65 - Raman scattering

Abstract

A driving and stabilization system for a pump laser, and a pump laser system. The driving and stabilization system includes a constant current stabilization device, a constant temperature stabilization device, a power detection device, an environment detection device, and a control device. The constant current stabilization device includes a voltage comparison circuit, a constant current driving circuit, and a switch protection circuit. The constant temperature stabilization device includes an internal constant temperature stabilization circuit and an external constant temperature stabilization circuit.

IPC Classes  ?

• H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
• H01S 3/00 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
• H01S 3/0941 - Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a semiconductor laser, e.g. of a laser diode
• H01S 5/024 - Arrangements for thermal management
• H01S 5/068 - Stabilisation of laser output parameters
• H01S 5/0683 - Stabilisation of laser output parameters by monitoring the optical output parameters

Abstract

A device for fabricating a quartz microfluidic chip by a femtosecond pulse cluster. The device includes: a femtosecond pulse cluster laser source configured to output a femtosecond pulse cluster; a beam splitting and interference system, configured to split the femtosecond pulse cluster into a plurality of parts, and to converge split parts to form a femtosecond pulse cluster plasma or a femtosecond pulse cluster plasma grating; a sample system configured to move the electronic displacement platform where a quartz glass is placed to control a position where the parts of the femtosecond pulse cluster are converged on the quartz glass; and a hydrofluoric acid immersion system configured to immerse the quartz glass in a diluent hydrofluoric acid solution to remove an ablated part of the quartz glass to form the quartz microfluidic chip.

IPC Classes  ?

• B23K 26/0622 - Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
• B23K 26/06 - Shaping the laser beam, e.g. by masks or multi-focusing
• B23K 26/067 - Dividing the beam into multiple beams, e.g. multi-focusing
• B23K 26/324 - Bonding taking account of the properties of the material involved involving non-metallic parts
• B23K 26/362 - Laser etching
• B23K 26/40 - Removing material taking account of the properties of the material involved
• B23K 26/50 - Working by transmitting the laser beam through or within the workpiece
• B23K 26/55 - Working by transmitting the laser beam through or within the workpiece for creating voids inside the workpiece, e.g. for forming flow passages or flow patterns
• B23K 26/57 - Working by transmitting the laser beam through or within the workpiece the laser beam entering a face of the workpiece from which it is transmitted through the workpiece material to work on a different workpiece face, e.g. for effecting removal, fusion splicing, modifying or reforming
• B23K 101/40 - Semiconductor devices
• B23K 103/00 - Materials to be soldered, welded or cut

Abstract

A method for producing a conductive glass fiber mesh with laser induced coating graphene comprises: (I) preparing a glass fiber paper coated with a carbon-containing precursor material; (II) subjecting the glass fiber paper coated with the carbon-containing precursor material to laser irradiation to reduce the carbon-containing precursor material into the laser induced coating graphene, obtaining a glass fiber paper coated with the laser induced coating graphene; and (III) folding the glass fiber paper coated with the laser induced coating graphene to obtain the conductive glass fiber mesh with laser induced coating graphene.

IPC Classes  ?

• C03C 25/12 - General methods of coating; Devices therefor
• C03C 25/44 - Carbon, e.g. graphite
• H01B 1/06 - Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances

Abstract

A method for manufacturing a large-area volume grating includes: (1) splitting a laser beam into two or more laser beams, converging the two or more laser beams into a sample at an angle less than 60° to form a first plasma grating; (2) moving the sample in a longitudinal direction of a plane vertical to the first plasma grating to etch out a first prefabricated volume grating; (3) moving the sample laterally to form a second plasma grating, an effective cross section of the first prefabricated volume grating partially overlapping with that of the second plasma grating, then moving the sample in a longitudinal direction of a plane vertical to the second plasma grating to etch out a second prefabricated volume; and (4) repeating steps (2) and (3) n times to obtain a volume grating in any size.

IPC Classes  ?

• C03C 23/00 - Other surface treatment of glass not in the form of fibres or filaments
• B23K 26/06 - Shaping the laser beam, e.g. by masks or multi-focusing
• B23K 26/0622 - Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
• B23K 26/067 - Dividing the beam into multiple beams, e.g. multi-focusing
• B23K 26/08 - Devices involving relative movement between laser beam and workpiece
• B23K 26/14 - Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
• B23K 26/362 - Laser etching
• G02B 5/18 - Diffracting gratings
• B23K 103/00 - Materials to be soldered, welded or cut

Abstract

A method for processing a chip based on deep learning and an apparatus for processing a chip based on deep learning are provided. The method includes scanning the chip with femtosecond laser in a predetermined polarization state to produce a main scanning trajectory and periodic nano-stripes on both sides of the main scanning trajectory, so as to form a nano-ridge structure on a surface of the chip; obtaining a super-resolution microscopic image of the nano-ridge structure by super-resolution microscopy; obtaining a target image; reconstructing the target image based on deep learning for image super-resolution to obtain the reconstructed image, and recognizing and processing the reconstructed image to obtain characteristic parameters of the nano-ridge structure as input parameters for deep learning for femtosecond laser processing; adjusting processing parameters of the chip according to the output values of the deep learning model for femtosecond laser processing; and outputting the optimized nano-ridge structure.

IPC Classes  ?

• B23K 26/364 - Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
• G06T 3/40 - Scaling of a whole image or part thereof
• G06T 7/00 - Image analysis
• B23K 26/03 - Observing, e.g. monitoring, the workpiece
• B23K 26/402 - Removing material taking account of the properties of the material involved involving non-metallic material, e.g. isolators
• B23K 26/082 - Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
• B23K 26/0622 - Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
• G06N 20/00 - Machine learning

Abstract

A laser velocimetry method and system are provided. In the method, an ultrashort pulse laser is subjected to temporal broadening, beam splitting and spectrum broadening in sequence to from a three-dimensional measurement space. When an object moves in the measurement space, a first signal light s_1, a second signal light s_2, a third signal light s_3 are generated, based on which velocity components vy, vx, and vx of the target object can be obtained, respectively, so as to obtain the velocity of the object in accordance with a formula of v=vx·i+vy·j+vz·k.

IPC Classes  ?

• G01S 17/58 - Velocity or trajectory determination systems; Sense-of-movement determination systems
• G01S 7/481 - Constructional features, e.g. arrangements of optical elements

Abstract

A glass fiber filter element for visible light photocatalysis and air purification and a method for preparing the same. The glass fiber filter element includes 4 to 7 wt % of nanoparticles including at least one selected from zinc oxide, graphene oxide, titanium oxide, and reduced graphene oxide, 2 to 7 wt % of silver nanowires, 3 to 12 wt % of an adhesive system, and 78 to 91 wt % of a glass fiber mat, based on the total weight of the glass fiber filter element. The glass fiber mat is made of at least two glass fibers with different diameters, and the diameters are in a range of 0.15 to 3.5 μm. The nanoparticles have a particle size from 1 to 200 nm, and the silver nanowires have a diameter of 15 to 50 nm.

IPC Classes  ?

• B01J 23/50 - Silver
• A61L 9/18 - Radiation
• B01D 39/20 - Other self-supporting filtering material of inorganic material, e.g. asbestos paper or metallic filtering material of non-woven wires
• B01D 46/00 - Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
• B01D 53/88 - Handling or mounting catalysts
• B01J 21/18 - Carbon
• B01J 23/04 - Alkali metals
• B01J 23/06 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of zinc, cadmium or mercury
• B01J 35/23 - in a colloidal state
• B01J 35/39 - Photocatalytic properties
• B01J 35/58 - Fabrics or filaments
• B01J 37/02 - Impregnation, coating or precipitation
• B01J 37/10 - Heat treatment in the presence of water, e.g. steam
• C03C 25/1095 - Coating to obtain coated fabrics
• C03C 25/16 - Dipping
• C03C 25/46 - Metals
• C03C 25/47 - Coatings containing composite materials containing particles, fibres or flakes, e.g. in a continuous phase

Abstract

The present disclosure discloses a method and apparatus for manufacturing a microfluidic chip with a femtosecond plasma grating. The method is characterized in that two or more beams of femtosecond pulse laser act on quartz glass together at a certain included angle and converge in the quartz glass, and when pulses achieve synchronization in time domain, the two optical pulses interfere; Benefited by constraint of an interference field, only one optical filament is formed in one interference period; and numbers of optical filaments are arranged equidistantly in space to form the plasma grating. The apparatus for manufacturing the microfluidic chip includes a plasma grating optical path, a microchannel processing platform, and a hydrofluoric acid ultrasonic cell.

IPC Classes  ?

• B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate
• B23K 26/55 - Working by transmitting the laser beam through or within the workpiece for creating voids inside the workpiece, e.g. for forming flow passages or flow patterns
• G01J 3/26 - Generating the spectrum; Monochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filter
• G02B 26/00 - Optical devices or arrangements for the control of light using movable or deformable optical elements

Abstract

The present disclosure discloses a method and apparatus for preparing a femtosecond optical filament interference direct writing volume grating/chirped volume grating. The method is characterized in that optical filaments are formed in glass by using femtosecond pulse laser, and plasma is controlled to quickly scan in the glass and etch a volume grating or chirped volume grating structure by adjusting the focal length of convex lens, laser energy and movement of motor machine. The apparatus includes a femtosecond pulse laser module, a pulse chirp management module, a pulse time domain shaping module, a laser separation and interference module, a glass volume grating processing platform module and a camera online imaging module.

IPC Classes  ?

• G02B 5/18 - Diffracting gratings
• G03H 1/04 - Processes or apparatus for producing holograms
• G03H 1/02 - HOLOGRAPHIC PROCESSES OR APPARATUS - Details peculiar thereto - Details

Abstract

A device and a method for direct printing of a microfluidic chip based on a large-format array femtosecond laser. The large-format array femtosecond laser with multi-parameter adjustable laser beam state is used to achieve large-format laser interference. The interference state, interference combination and exposure mode of the large-format array femtosecond laser are regulated, and multiple exposures are superimposed to output the desired pattern for the microfluidic chip, enabling the direct printing processing of the microfluidic chip.

IPC Classes  ?

• B01L 3/00 - Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
• B23K 26/03 - Observing, e.g. monitoring, the workpiece
• B23K 26/06 - Shaping the laser beam, e.g. by masks or multi-focusing
• B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate
• G06F 30/3308 - Design verification, e.g. functional simulation or model checking using simulation

Abstract

A silicon nitride phased array chip based on a suspended waveguide structure, which includes a silicon nitride waveguide area and a suspended waveguide area. The silicon nitride waveguide area includes a silicon substrate, a silicon dioxide buffer layer, a silicon dioxide cladding layer and a silicon nitride waveguide-based core layer. The silicon nitride waveguide-based core layer includes an optical splitter unit, a first curved waveguide, a thermo-optic phase shifter and a spot-size converter. The suspended waveguide area includes a second curved waveguide and an array grating antenna.

IPC Classes  ?

• G02B 6/12 - Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
• G02B 6/122 - Basic optical elements, e.g. light-guiding paths
• G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour

Abstract

A method for processing a micro-channel of a micro-fluidic chip using multi-focus ultrafast laser, in which an array-type multi-focus femtosecond laser is used to perform fractional ablation on the micro-fluidic chip, and then pulse laser is used to perform secondary ablation on the micro-fluidic chip. Ultrasonic-assisted hydrofluoric acid etching is performed on the micro-fluidic chip after ablation to obtain a true three-dimensional micro-channel on the micro-fluidic chip. A device for processing a micro-channel of a micro-fluidic chip using multi-focus ultrafast laser is also provided.

IPC Classes  ?

• B23K 26/55 - Working by transmitting the laser beam through or within the workpiece for creating voids inside the workpiece, e.g. for forming flow passages or flow patterns
• B01L 3/00 - Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
• B23K 26/067 - Dividing the beam into multiple beams, e.g. multi-focusing
• B23K 26/361 - Removing material for deburring or mechanical trimming
• B23K 26/70 - Auxiliary operations or equipment

Abstract

A method and a system for automatically controlling mode-locking of an optical frequency comb, where the stored control parameters of the working condition in the mode-locked state is combined with the collected working feedback parameters of the optical frequency comb system to dynamically adjust and control the working power of the pump source or/and the temperature of the working environment of the pump source, which not only greatly shortens the control time for stable mode-locking and realizes a fast mode-locking control, but also reduces unnecessary power consumption, thereby further guaranteeing the energy-saving effect of power adjustment control process. The present disclosure well maintains the stable working conditions of the optical comb system, and realizes the mode-locking optimization control of an update mode for the big data, thereby effectively improving the mode-locking control process of the optical frequency comb system, and providing higher operation stability and measurement accuracy.

IPC Classes  ?

• H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
• H01S 3/1106 - Mode locking
• H01S 3/1109 - Active mode locking
• H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
• H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating

Abstract

A method and a system for controlling an optical frequency comb, where the working power of the pump source is dynamically adjusted and controlled, which not only greatly shortens a control time of a stable mode-locking and realizes a fast mode-locking control, but also quickly stabilizes the power control of stable working condition, thereby reducing unnecessary power consumption caused by power reciprocating oscillation tracking controls and better achieving the energy-saving effect of the power adjustment control process. The temperature of the working environment of the pump source is dynamically adjusted and controlled, so that the environment temperature can quickly reach the reference environment temperature required for mode-locking, which not only creates a good temperature condition for the mode-locking of the optical comb system, but also improves the efficiency of environment temperature stability control in the stable working conditions.

IPC Classes  ?

• G02F 1/35 - Non-linear optics
• H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
• H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation

Abstract

Provided is a system for measuring gas temperature and component concentrations in a combustion field based on optical comb. The system includes two pulse laser devices, two continuous laser devices, a beam splitting device, a measurement path, an interference signal detecting device, an optical processing and electrical processing device and a signal acquisition and analysis device. The measurement path refers to the combustion field to be measured. The interference signal detecting device outputs an interference signal. The optical processing and electrical processing device includes several optic elements and electrical elements, and outputs an adaptive compensation signal and an asynchronous sampling clock signal after a series of processing on output of the two pulse laser devices and two continuous laser devices. The signal acquisition and analysis device outputs the measurement result based on the adaptive compensation signal, the asynchronous sampling clock signal and a stable interference signal.

IPC Classes  ?

• G01N 21/31 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
• G01J 5/58 - Radiation pyrometry, e.g. infrared or optical thermometry using extinction effect
• G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups

Abstract

The present disclosure relates to a gain optical fiber heat-dissipating device for high power ultra-fast laser, including a gain optical fiber and a heat-dissipating structure. The heat-dissipating structure includes a metal tube, a flexible heat-conducting layer and a water-cooling structure. The gain optical fiber is passed through the metal tube, and the flexible heat-conducting layer is provided between the metal tube and the gain optical fiber. The water-cooling structure is provided on the metal tube to reduce temperature of the gain optical fiber. The gain optical fiber heat-dissipating device according to the present disclosure can dissipate the heat through a water-cooling mode, and realize rapid heat dissipation, thus improving heat-dissipating efficiency.

IPC Classes  ?

• H01S 3/04 - Arrangements for thermal management
• H01S 3/067 - Fibre lasers
• H01S 3/042 - Arrangements for thermal management for solid state lasers

Abstract

Provided are a time and frequency control method and system for optical comb. The method includes: controlling an optical comb measuring system to start and to generate an optical comb; obtaining monitoring data, wherein the monitoring data comprises a working temperature, a mode-locked frequency and a light pump power, wherein the mode-locked frequency comprises a repetition frequency and a carrier envelope phase locked at the end of starting the optical comb measuring system; determining whether an offset of the mode-locked frequency exceeds a self-feedback adjustment range of a hardware adjustment circuit; and in response to any of the repetition frequency and the carrier envelope phase exceeds the self-feedback adjustment range, adjusting the working temperature and the light pump power until the mode-locked frequency returns back into the self-feedback adjustment range.

IPC Classes  ?

• H01S 3/13 - Stabilisation of laser output parameters, e.g. frequency or amplitude
• H01S 3/00 - Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
• H01S 3/1106 - Mode locking
• H01S 3/131 - Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation

Abstract

A three-port silicon beam splitter chip includes an input waveguide, three output waveguides, and a coupling region disposed between the input waveguide and the output waveguides and being in a square shape. The input waveguide and the output waveguide have a same width K, where 490 nm

IPC Classes  ?

• G02B 27/10 - Beam splitting or combining systems
• G02B 6/125 - Bends, branchings or intersections
• G02B 6/13 - Integrated optical circuits characterised by the manufacturing method

Abstract

The disclosure provides a super-resolution fast-scanning coherent Raman scattering imaging method. The method: using pump light and Stokes light; combining the pump light and the Stokes light to obtain combined light; expanding/collimating the combined light; the combined light after the expanding/collimating entering a galvanometer, passing through a group of a scanning lens/a tube lens and being focused on a back focal plane of a microobjective and incidenting into a biological sample, such that the biological sample is excited to emit anti-Stokes light; collecting the excited anti-Stokes light by a detector. This method is characterized by deflecting, at different angles, a single light spot focused on the microobjective through a diffractive optics group including DOE and a dispersive element, into a plurality of 1×N light spots to incident into the biological sample, such that the anti-Stokes light excited from smaller molecules and being condensed and filtered, is collected by the detector.

IPC Classes  ?

• G01J 3/44 - Raman spectrometry; Scattering spectrometry
• G01N 21/65 - Raman scattering
• G01J 3/28 - Investigating the spectrum

Abstract

Provided are a method and a system for measuring a transient time width of an ultrashort pulse in real time. The method includes: performing an interaction of a laser pulse to be measured with a linear chirped pulse in a second-order non-linear medium, to generate a sum-frequency beam, wherein an intensity sag occurs in the chirped pulse after the interaction; performing a time spreading by a time stretching system on the chirped pulse with the intensity sag; detecting the spread chirped pulse with the spread intensity sag by a photoelectric detector, and measuring and recording a time width τ′ of the spread intensity sag by an oscilloscope; and obtaining the transient time width τ of the laser pulse to be measured according to a formula of τ=τ′/M, where M is an amplification coefficient of the time stretching system.

IPC Classes  ?

• G01J 11/00 - Measuring the characteristics of individual optical pulses or of optical pulse trains

Abstract

The present disclosure provides a stealth dicing method and apparatus. With the method, the focusing element focuses the laser beam on the surface of material to be diced, and the dynamic-equilibrium plasma channel is formed in the material to be diced by means of self-focusing and defocusing effect of plasma generated by ionizing the material to be diced. The modified layer may be formed in the material to be diced throughout the plasma channel, so as to realize stealth dicing.

IPC Classes  ?

• H01L 21/78 - Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
• H01L 21/268 - Bombardment with wave or particle radiation with high-energy radiation using electromagnetic radiation, e.g. laser radiation
• B23K 26/064 - Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
• B23K 26/08 - Devices involving relative movement between laser beam and workpiece
• B23K 26/06 - Shaping the laser beam, e.g. by masks or multi-focusing
• B23K 26/0622 - Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
• B23K 26/402 - Removing material taking account of the properties of the material involved involving non-metallic material, e.g. isolators
• B23K 26/53 - Working by transmitting the laser beam through or within the workpiece for modifying or reforming the material inside the workpiece, e.g. for producing break initiation cracks
• B23K 26/073 - Shaping the laser spot
• B23K 103/00 - Materials to be soldered, welded or cut

Abstract

Provided is a method for preparing a graphene-copper calcium titanate CCTO based ceramic composite dielectric material, which includes: dissolving metal ion sources in respective solvents to obtain respective solutions, and mixing the solutions evenly to obtain a precursor collosol of the CCTO based ceramic; allowing the precursor collosol of the CCTO based ceramic to stand for aging, followed by adding a graphene oxide dispersion to mix with the precursor collosol evenly, drying the resulting mixture to obtain dry precursor powders of the graphene-CCTO based ceramic, which are then grinded into fine powders, followed by irradiating by a low-power laser to obtain graphene-CCTO based ceramic composite powders; and compacting and molding the graphene-CCTO based ceramic composite powders, followed by catalytic synthesis with a high-power laser to obtain the graphene-CCTO based ceramic composite dielectric material.

IPC Classes  ?

• C04B 35/462 - Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on titanium oxides or titanates based on titanates

Abstract

n to obtain a mixture, ball-milling the mixture until a particle size of the mixture is not greater than 1 μm with a medium selected from a group consisting of ethanol, acetone, deionized water and a combination thereof, to obtain a powder, drying the powder at a temperature in a range of 60 to 80° C., and sintering the powder with a laser irradiation having a laser wavelength of 980 nm, an irradiation power ranging from 50 to 1500 W and an irradiation period of 3 s to 8 min to obtain the ceramic material.

IPC Classes  ?

• C01G 25/00 - Compounds of zirconium
• H01M 8/1253 - Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides the electrolyte containing zirconium oxide
• C01B 33/20 - Silicates

Abstract

Disclosed is a method for preparing a carbon-reinforced metal-ceramic composite material, including: mixing raw materials of carbon, copper, zinc, titanium, copper oxide, calcium oxide and titanium dioxide, ball-milling the raw materials with a medium of ethanol to obtain a mixture, drying and milling the mixture to obtain a powder, sintering the powder with a laser having an irradiation power ranging from 100 to 600 W and an irradiation period of 3 min to 10 min to obtain a product, and rapidly cooling the product to allow a temperature of the product to be decreased to the room temperature within 5 min to obtain the carbon-reinforced metal-ceramic composite material.

IPC Classes  ?

• C04B 35/46 - Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on titanium oxides or titanates
• C04B 35/78 - Ceramic products containing macroscopic reinforcing agents containing non-metallic materials

Abstract

A method for preparing a graphene based composite wave-absorbing material includes: dissolving a water soluble barium salt and a water soluble iron salt into deionized water, respectively; mixing barium salt solution and iron salt solution according to a molar ratio of Ba:Fe of 1:12 to obtain a precursor solution; dispersing a graphene material in deionized water to form a graphene dispersion; adding citric acid, nitric acid and the graphene dispersion into the precursor solution in sequence to form a mixture solution; stirring the mixture solution at a temperature of 50 to 75° C. to obtain a sol; coating and drying aged sol on a substrate to obtain a coating layer; and sintering the coating layer by a laser irradiation.

IPC Classes  ?

• C01B 32/198 - Graphene oxide
• C01B 32/194 - After-treatment
• B01J 13/00 - Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
• B05D 1/00 - Processes for applying liquids or other fluent materials
• B05D 3/06 - Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation