16 results about "Nd:YAG laser" patented technology

The invention belongs to the technical field of nondestructive testing, and discloses a gold ore and iron ore metal content detection method. The method comprises the following steps: acquiring an XRF energy spectrum by using an X-ray tube, acquiring an LIBS spectrum by using double-pulse Nd: YAG laser, and acquiring a Raman spectrum by using a semiconductor laser; performing baseline correction on the LIBS spectrum, performing Savitzky-Golay smoothing pretreatment on the Raman spectrum, and respectively extracting three types of spectrum characteristics; constructing a physical constraint network model, inputting XRF, LIBS and Raman features, and then outputting the correction content, fusion weight and LIBS dominant factors of Fe / Au elements; and finally, through a dynamic weight fusion strategy, combining XRF, LIBS fusion weights and network output parameters, calculating to obtain the content of the gold ore and the content of the iron ore. The technical breakthrough of multi-element cooperative detection and complex matrix interference suppression is realized, and the detection precision of Fe and Au is effectively improved.

The invention provides a single-line excitation OH plane laser-induced fluorescence temperature measurement system and method, and belongs to the technical field of aero-engine special tests, the system comprises an Nd: YAG laser, a sheet light shaping lens group, two ICCD cameras and a data acquisition device, the laser outputs quadruplicated pulse laser, the sheet light shaping lens group is arranged at the output end of the laser, and the data acquisition device is arranged at the output end of the laser. Laser sheet light is output through the sheet light shaping lens group to illuminate a to-be-detected area in the flame and reacts with OH groups in the flame to generate fluorescent light; the cameras are respectively arranged opposite to flames, are respectively in communication connection with the data acquisition device, are respectively provided with a band-pass optical filter with different bandwidths, and are used for synchronously measuring fluorescence to obtain a bispectral fluorescence image, and the data acquisition device is used for carrying out data processing on the image to realize two-dimensional temperature distribution measurement. Through the processing scheme provided by the invention, the measurement system configuration and the data processing flow are remarkably simplified, and the light spot quality and the signal-to-noise ratio are improved.

The invention discloses a green laser assembly, an optical module and application of the green laser assembly in photovoltaic assembly processing, a shell is provided with a first fixed reflector coated with a reflecting film for reflecting 1064nm, a first acousto-optic Q switch and a second acousto-optic Q switch are orthogonally arranged, an Nd: YAG laser uses an Nd: YAG crystal rod with the diameter of 6mm and the length of 166mm, and a second fixed reflector coated with a reflecting film for reflecting 1064nm is arranged on the Nd: YAG crystal rod. The first dichroscope transmits 1064nm and reflects 532nm to improve the conversion efficiency of frequency multiplication, the LBO crystal 16 is placed close to the second dichroscope to improve the power density and the conversion efficiency, and the second dichroscope reflects 1064nm and transmits 532nm. And the light with the wavelength of 532nm transmitted by the second dichroscope is coupled into an input end optical fiber of the optical fiber beam splitter after passing through the optical isolator and the first lens. The short-wavelength green laser is adopted, the photovoltaic welding strip is mainly composed of the copper base material and the tin alloy, the green laser absorptivity is far larger than the near-infrared wavelength (about 1 micron) absorptivity, and the laser absorptivity of the welding strip is remarkably improved.

Disclosed is a system for and method of performing target metrology in an extreme ultraviolet light source in which illumination for a target imaging / detection system is selected to have a center wavelength less than 400 nm. In some embodiments the illumination is additionally selected to have a line width of at least 4 nm. In some embodiments illumination is obtained as a second harmonic of a Ti:sapphire laser or as a harmonic of an Nd:YAG laser.

The present invention provides a high-energy linearly polarized 1319nm laser, comprising n Pelling-Broca prisms, n+1 Nd:YAG laser modules, a high-reflection mirror, an output mirror, and a Q-switch, where n is an integer greater than or equal to 1. The output mirror and the high-reflection mirror serve as cavity mirrors to form a resonant cavity. The Nd:YAG laser modules and the Pelling-Broca prisms are alternately arranged within the resonant cavity, with each Pelling-Broca prism located between two Nd:YAG laser modules. The Q-switch is located between the high-reflection mirror and the Nd:YAG laser module or between the output mirror and the Nd:YAG laser module. The technical solution of the present invention can produce high-energy 1319nm laser output.

The invention discloses a preparation method of a large-size nonlinear optical crystal NaI3O8, and belongs to the technical field of nonlinear optical crystal preparation. The large-size nonlinear optical crystal NaI3O8 is successfully prepared by taking iodine pentoxide and sodium nitrate as raw materials and adopting a hydrothermal synthesis method by controlling the raw material ratio and the cooling rate, the preparation method is simple, and the crystal is short in growth cycle, large in size and high in purity. Hazardous substances such as nitric acid are not adopted, the preparation process is safe, meanwhile, the method does not increase structural and process complexity, preparation is convenient, and environmental pollution is not increased. A Q-switched Nd: YAG laser is used for outputting laser with the wavelength of 1064nm as fundamental frequency light, the obtained NaI3O8 crystal material is subjected to a powder frequency doubling test, and a result shows that the crystal material has a relatively strong frequency doubling effect.

The invention is suitable for the fields of aircraft component configuration, power device design and measuring instrument design and development, and provides a combined test device for a low-altitude flight spark-ignition optical engine, which comprises a spark-ignition optical engine suitable for low-altitude flight. The system further comprises a first Nd: YAG laser, a second Nd: YAG laser, a dye laser, a first spectrometer, a second spectrometer, a first ICCD, a second ICCD and a DG 645 digital delay generator. Real-time synchronous measurement of in-cylinder component concentration and temperature designed and developed for a low-altitude flight spark-ignition engine can be realized, and research work of in-cylinder combustion characteristics and pollutant generation performance of the low-altitude flight engine can be explored based on the test device. And an important combined test device is provided for development design and performance optimization of a low-altitude flight power device.

The invention discloses a hybrid welding device based on three-beam laser collaborative operation and a welding method of the hybrid welding device, and belongs to the technical field of laser hybrid welding. The device comprises a computer, a multi-laser master control system, a high-power continuous MOPA optical fiber laser, a Q-switched pulse optical fiber laser, an Nd: YAG laser, a laser welding system, a laser forging system, a laser polishing system, a mechanical arm and a temperature sensor. According to the method, three laser processes of laser welding, laser forging and laser polishing are integrated in a continuous process, and a computer is matched with all systems, so that the apparent quality of a welding seam is improved, the roughness is reduced, the residual stress is regulated and controlled, and microdefects are reduced in one process at the same time; and the processing efficiency and the comprehensive performance of the joint are obviously improved. According to the method, the plastic deformation resistance of weld metal can be reduced, the effect of eliminating defects and implanting pressure stress through laser forging can be improved, and the polishing efficiency and precision can be improved.

The application belongs to the technical field of nondestructive testing, and discloses a gold ore and iron ore metal content detection method; the method comprises the following steps: XRF energy spectrum is acquired by using an X-ray tube, LIBS spectrum is collected by using a double-pulse Nd:YAG laser, and Raman spectrum is acquired by using a semiconductor laser; baseline correction is performed on the LIBS spectrum, Savitzky-Golay smoothing pretreatment is implemented on the Raman spectrum, and three types of spectral features are extracted respectively; a physical constraint network model is constructed, the corrected content of Fe / Au elements, the fusion weight and the LIBS dominant factor are outputted after the XRF, LIBS and Raman features are inputted; finally, the content of the gold ore and the iron ore is calculated by combining the XRF, LIBS fusion weight and network output parameters through a dynamic weight fusion strategy; the application realizes a technical breakthrough of multi-element collaborative detection and complex matrix interference suppression, and effectively improves the detection precision of Fe and Au.

The invention relates to the technical field of water quality health analysis, in particular to a paper-based laser-induced breakdown spectroscopy detection method for manganese content in water, which comprises the following steps: preparing a manganese element mother solution, diluting the manganese element mother solution into standard solutions with a series of concentrations, dropwise adding 10 microliters of the standard solutions by using quantitative filter paper as a carrier, and drying to obtain a solid sample; a sample is placed in a light-transmitting sample chamber, an Nd: YAG laser is adopted for excitation to generate plasmas, a plasma emission spectrum is collected through a light path system, one of the plasmas is selected in the wavelength range of a spectrograph to serve as a research spectral line of the Mn element, a Czerny-Turner spectrograph is used for collecting characteristic spectral lines, and finally a spectral intensity-concentration standard curve is established to achieve quantitative analysis. According to the method, the manganese element in the water is collected as a solid sample through the paper-based material, so that rapid quantitative detection of the manganese element is realized, the detection limit of the manganese element in the water is reduced, and meanwhile, effective detection of the low-concentration manganese element is realized by optimizing laser parameters and spectrum acquisition conditions.

The invention discloses a graphene oxide / MXene-carbon fiber hierarchical composite film based on laser synchronous reduction and micro-nano structure regulation and a preparation method of the graphene oxide / MXene-carbon fiber hierarchical composite film. The method comprises the following three steps: (1) etching a Ti3AlC2MAX phase by adopting HCl / HF-LiCl to prepare a single-layer MXene colloidal solution; (2) sequentially depositing an MXene layer and a graphene oxide (GO) layer on a commercial carbon fiber substrate (the surface density is 10g / m < 2 >) through a vacuum-assisted suction filtration technology, and performing vacuum drying to form a precursor; and (3) performing selective area irradiation on the precursor by using an Nd: YAG laser, synchronously realizing GO reduction and microstructure regulation and control, and finally obtaining the reduced graphene oxide (rGO) / MXene-carbon fiber hierarchical composite film. The film has the anti-oxidation-electric conduction-mechanical cross-scale synergistic characteristic, and shows excellent photo-thermal / electro-thermal conversion, super-hydrophobicity, electromagnetic shielding and other multifunctional integration performance.

The invention discloses a dual-wavelength laser polarization splitting multiplexing emission system and method and application, the system comprises a Rayleigh Raman laser emission module, a resonance fluorescence laser emission module and a laser emission switching module, the Rayleigh Raman laser emission module emits a 532 nm laser beam, the resonance fluorescence laser emission module emits a 589 nm laser beam, and the laser emission switching module is connected with the Rayleigh Raman laser emission module and the resonance fluorescence laser emission module. The Rayleigh Raman laser emission module and the resonance fluorescence laser emission module share one high-power Nd: YAG laser; the laser emission switching module comprises a high-power PBS and an electrically-controlled rotary high-damage-threshold half-wave plate, the electrically-controlled rotary high-damage-threshold half-wave plate is used for controlling the polarization angle of an emitted laser beam, and the high-power PBS is used for controlling the emission direction of the laser beam. The dual-wavelength laser polarization splitting multiplexing emission technology provided by the invention can well meet the high specification requirements of the full-upper atmosphere temperature measurement laser radar on dual wavelength, high power and the like of laser emission, and is applied to the full-upper atmosphere temperature measurement laser radar.

A system for mitigating pollution from hydraulic fracturing uses a laser reduction liquid (LRL) unit operable to receive flow back from a wellhead. The LRL unit includes a CO2 filtration unit for filtering CO2 from the flow back, a CO2 purification unit for purifying the filtered CO2, and a reaction unit including Q-driven ND:YAG laser and a reaction site at which a pulsed laser beam from the Q-driven ND:YAG laser is directed at the purified CO2 in the presence of a photocatalyst to thereby convert the CO2 into methanol and water.

The invention provides a terahertz light source based on gas stimulated Raman pumping optical difference frequency, which comprises an Nd: YAG laser, a stimulated Raman gas cell and a nonlinear optical crystal which are sequentially arranged, a first lens is arranged between the Nd: YAG laser and the stimulated Raman gas cell, and a second lens is arranged between the Nd: YAG laser and the stimulated Raman gas cell. A second lens is arranged between the stimulated Raman gas cell and the nonlinear optical crystal; laser emitted by the Nd: YAG laser enters the stimulated Raman gas cell, first laser and second laser are generated through a stimulated Raman process, the wavelength of the first laser is lambda1, the wavelength of the second laser is lambda2, and the first laser and the second laser generate an optical parameter difference frequency effect in the nonlinear optical crystal to generate terahertz light. The terahertz light source is simple in structure, large in output energy and high in stability.

The application provides a mid-infrared laser based on hydrogen Raman laser and optical parametric oscillation, comprising a Nd:YAG laser, a hydrogen stimulated Raman cell and an optical parametric oscillator, wherein the Nd:YAG laser emits circularly polarized laser, the circularly polarized laser enters the hydrogen stimulated Raman cell, and multi-wavelength laser is generated through a stimulated Raman process; and specific wavelength laser in the multi-wavelength laser excites the optical parametric oscillator to generate mid-infrared laser. In the application, 1064nm circularly polarized laser generates 2.1mu m laser through hydrogen stimulated Raman, and the 2.1mu m laser pumps ZGP OPO to generate 3-5mu m infrared laser. The working principle of the laser of the application is simple, and compared with the scheme of Tm:YLF, Ho:YAG and OPO emitting light in turn, the complexity is significantly reduced, and the advantages of the stable and reliable Nd:YAG laser are fully utilized.

The invention discloses a mid-infrared three-wavelength laser crystal material and a preparation method and application thereof, and belongs to the field of inorganic functional crystal materials. The chemical formula of the intermediate infrared three-wavelength laser crystal material is KDyYGdF10. And the crystal is grown by adopting a Bridgman method. The laser crystal material has ultra-wide-band absorption and emission performance, can realize light emission in the middle-infrared band of 2500-3300 nm and the middle-infrared band of 4100-4400 nm under pumping of 1277 nm, and has peak wavelengths of 2849 nm, 4235 nm and 4273 nm respectively. The laser crystal material has the characteristics of low phonon energy, low melting point, same-component melting and the like, the absorption wavelength of the laser crystal material is matched with that of a commercial Nd: YAG laser pumping source, the absorption peak intensity is high, the absorption of pump light by the crystal is facilitated, so that fluorescence emission with peak wavelengths of 2849 nm, 4235 nm and 4273 nm in a middle-infrared band is realized, and the laser crystal material is a middle-infrared laser crystal material with great application potential.