6 results about "Nd:YAG laser" patented technology

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.

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.