69results about How to "High energy laser" patented technology

A method and apparatus of providing endovascular therapy. The steps include arranging optical fibers within a catheter, the catheter having a tip whose length is at least 1 cm and whose diameter of less than 1 millimeter, connecting an excimer laser to the optical fibers; and delivering laser energy from the excimer laser in excess of 60 fluence at 40 Hertz through the optical fibers. The delivering of the laser energy may be to non-calcified or calcified deposits of an atherosclerotic lesion to ablate the same. The method also includes the step of inserting the catheter through an artery by pushing the same until the tip is in within laser energy striking distance of the atherosclerotic lesion.

A method and apparatus for performing simultaneous multi-point measurements of multiple velocity components in a gas flow is described. Pulses of laser light are directed to a measurement region of unseeded gas to produce Rayleigh or Mie scattered light in a plurality of directions. The Rayleigh or Mie scattered light is collected from multiple directions and combined in a single collimated light beam. The Rayleigh or Mie scattered light is then mixed together with a reference laser light before it is passed through a single planar Fabry-Perot interferometer for spectral analysis. At the output of the interferometer, a high-sensitivity CCD camera images the interference fringe pattern. This pattern contains the spectral and spatial information from both the Rayleigh scattered light and the reference laser light. Interferogram processing software extracts and analyzes spectral profiles to determine the velocity components of the gas flow at multiple points in the measurement region. The Rayleigh light rejected by the interferometer is recirculated to increase the accuracy and the applicability of the method for measurements at high temperatures without requiring an increase in the laser energy.

The present invention provides methods, systems, and apparatus for calibrating a laser ablation system, such as an excimer laser system for selectively ablating a cornea of a patient's eye. The invention also facilitates alignment of eye tracking cameras that measure a position of the eye during laser eye surgery. A calibration and alignment fixture for a scanning laser beam delivery system having eye tracking cameras may include a structure positionable in a treatment plane. The structure having a feature directing laser energy incident thereon to a calibration energy sensor, at least one reference-edge to determine a characteristic of the laser beam (shape, dimensions, etc.), and an artificial pupil to determine alignment of the eye tracking cameras with the laser system.

The invention provides a cluster film formation system in which, in a cluster formation container 5, target 1 is irradiated with laser beams 2 to generate material vapor, which generates a shock wave 4 of an inert gas, and the shock wave 4 is reflected by a wall of the cluster formation container 5 to confine the material vapor having progressed in a particular region, and atoms or molecules of the material vapor and the inert gas collide with each other mutually to form groups of clusters, which are made to flow out through an outflow window 7, and sprayed deposited on a substrate 9 to form a cluster film 10. Corresponding to augmentation of energy strength of the laser beams 2, a cross section area of the laser beams 2 on the surface of the target is made large, thereby an increase in the amount of generation of the material vapor and efficient generation of the shock wave of the inert gas both are realized, and at the same time, the cluster formation container is enlarged so that the reflected wave of the shock wave meets conditions for confining the material vapor.

The present invention provides methods, systems, and apparatus for calibrating a laser ablation system, such as an excimer laser system for selectively ablating a cornea of a patient's eye. The invention also facilitates alignment of eye tracking cameras that measure a position of the eye during laser eye surgery. A calibration and alignment fixture for a scanning laser beam delivery system having eye tracking cameras may include a structure positionable in a treatment plane. The structure having a feature directing laser energy incident thereon to a calibration energy sensor, at least one reference-edge to determine a characteristic of the laser beam (shape, dimensions, etc.), and an artificial pupil to determine alignment of the eye tracking cameras with the laser system.

The present invention relates to a light-emitting amorphous silicon carbide nanoparticle preparation method, and belongs to the technical field of photoelectric materials. The method is mainly characterized in that the silicon carbide polycrystalline ceramic sheet surface is subjected to a polishing treatment, focusing is performed onto the polycrystalline ceramic sheet immersed in deionized water by using excimer pulse laser, and during the irradiation process, a three-dimensional controllable platform carries a beaker to slowly translate so as to make the laser irradiation position on the ceramic sheet be continuously changed, such that finally the amorphous silicon carbide nanoparticles suspended in the deionized water and having the diameter of about 10 nm is obtained, wherein the surface is hydrophilic so as to ensure that the amorphous nanoparticles can be stably suspended in the ionized water and do not produce settling. In addition, the amorphous silicon carbide nanoparticles have strong and stable blue light emission, and have good application prospects in the fields of photoelectricity and biomedicine.

The invention discloses a skin-core type poly(lactic acid) (PLA)/poly[(3-hydroxybutyrate)-co-(3-hydroxyvalerate)] (PHBV) composite fiber and a preparation method thereof, and belongs to the field of high polymer materials. The preparation method of the skin-core type PLA/PHBV composite fiber specifically includes the steps: 1, respectively drying the raw material PLA in a skin layer and a raw material PHBV in a core layer, wherein moisture content of the PLA and the PHBV is not more than 200 ppm; and 2, weighing the raw materials PLA and PHBV obtained in the step 1 according to a composite spinning ratio to perform compositely spinning, melting spinning, cross air blowing, applying oil, winding, online stretching, and thermoforming to obtain the skin-core type PLA/PHBV composite fiber, wherein the number of holes in a spinning plate used during a spinning process is 24-144. The material prepared according to the method is high in breaking strength, and can be applied to the fields of medical materials, agricultural textile, disposable goods and package materials.

The invention discloses a method and device for preparing spherical metal powder through combined atomization, and belongs to the technical field of metal powder preparation. The device comprises a metal melting system, a water atomizing system, a powder drying system, a laser spheroidizing system, a powder collecting system, a gas circulating system and a control system. A water atomization method has the characteristics of low cost, high production efficiency and small granularity but the prepared powder is uneven in morphology and high in oxygen content; a laser spheroidizing method is highin laser energy and directivity controllability and can spheroidize irregular powder; and the two methods are combined so that advantages can be combined and disadvantages can be overcome, and the combined method is suitable for preparing spherical metal powder. The method and device have good application prospects in actual production of advanced manufacturing technologies such as 3D printing.

A method of x-ray and gamma-ray generation via laser Compton scattering uses the interaction of a specially-formatted, highly modulated, long duration, laser pulse with a high-frequency train of high-brightness electron bunches to both create narrow bandwidth x-ray and gamma-ray sources and significantly increase the laser to Compton photon conversion efficiency.

The invention provides a nitride-based light emitting diode chip and a manufacturing method thereof. Focusing at a position having a distance of 10mum-40mum to a back face of a substrate inwards is carried out, laser energy increases, laser frequency is adjusted, hidden laser cutting is realized in the substrate to form a hole through ablation penetrating through the back face of the exposed substrate, accessory substances such as burn marks and chippings generated during hidden laser cutting are effectively discharged, light absorption of the accessory substances can be reduced, light emission at side walls of the light emitting diode increases, and light emitting efficiency is improved, moreover, as the substrate and the hole have different refractive indexes, and laser scratch makes side faces of an LED chip coarsen similarly, a light removal angle is improved, increase of axial light is realized, and integral light emitting efficiency of the LED chip is improved.

The invention discloses a great-core-diameter optical fiber coupler, which comprises an input optical fiber and n output optical fibers, wherein the n is greater than or equal to 1 but smaller than or equal to 6, the core diameter of the input optical fiber is 200 to 600mum, the core-to-sheath ratio range of the input optical fiber is 1:1.04 to 1:1.25, the core diameter of each output optical fiber is 200 to 400mum, the core-to-sheath ratio of the output optical fiber is identical to that of the input optical fiber, the input optical fiber and the output optical fibers are fixed and twisted in a coupling region, one end, in the coupling region, of the input optical fiber is the output end of the input optical fiber, the other end of the input optical fiber is the input end of the input optical fiber, one end, in the coupling region, of each output optical fiber is the input end of each output optical fiber, and the other end of each output optical fiber is the output end of the output optical fiber. The great-core-diameter optical fiber coupler has the advantages that the optical fiber coupling difficulty is low, the light splitting ratio of the coupler is uniform, the optical fiber uncoaxiality caused by optical fiber accumulation in the coupling region is reduced, the light spot divergence angle is smaller than 30 degrees, the transmittance is greater than 70 percent, any light splitting ratio can be realized, and the light splitting ratio deviation is +/-7 percent.

The invention provides a multi-beam laser amplification scanning processing system and method based on light field regulation and control. The method comprises the following steps: expanding emitted laser; modulating the expanded laser by using a hologram to obtain multi-beam laser with preset light field distribution; carrying out energy amplification on the multi-beam laser to obtain high-powermulti-beam laser; and controlling high-power multi-beam laser to scan and process a workpiece to be processed. The multi-beam laser amplification scanning processing system and method based on light field regulation and control can flexibly regulate and control light beams and carry out power amplification, can realize high-precision, high-quality, high-efficiency and infinite-amplitude laser processing, and have wide application prospects.

The invention discloses a small-taper high-quality efficient machining device and method for via holes in the surface of a packaging substrate. According to the method, firstly, an ultrasonic vibration auxiliary laser machining system is built, then the packaging substrate is cleaned and clamped on a clamp for laser drilling, and a precise movement workbench is controlled to focus laser on the upper surface of the packaging substrate; then, the coupling vibration frequency of the packaging substrate is searched through an ultrasonic vibration auxiliary device, and ultrasonic vibration parameters are set; laser processing parameters are set through a computer, a laser scanning track is drawn, and scanning track parameters are set; then, a computer controls a short pulse laser to output laser, an ultrasonic vibration device is started at the same time, and a scanning galvanometer is used for controlling the laser to conduct via hole machining on the packaging substrate along a set path; and after the via holes are machined, the packaging substrate is cleaned to obtain a finished product. According to the method, laser processing is assisted by ultrasonic vibration, and material removal is carried out by adopting a laser multi-ring cutting processing track, so that the taper of the via holes is reduced, and the machining efficiency is greatly improved.