94 results about "High intensity lasers" patented technology

A method for laser anti-inflammatory treatment of painful symptomatologies and for tissue regeneration includes generating a pulsed laser beam with laser at a wavelength between 0.75 and 2.5 micrometers. The laser energy is conveyed to a hand unit where the laser beam is preferably defocused. The operator then applies the defocused laser beam the skin of a patient in need of treatment. The average power density per pulse of the defocused laser beam on the skin being 8 W/cm² per pulse or more.

A method of manufacturing a workpiece involves performing any one of various post-processing part modification steps on a workpiece that has been previously subjected to laser shock processing. In one step, material is removed from the compressive residual stress region of the processed workpiece. Alternately, the workpiece may be provided with oversized dimensions such that the removal process removes an amount of material sufficient to generate a processed workpiece having dimensions substantially conforming to design specifications. Alternately, the material removal process is adapted to establish a penetration depth for material removal that coincides with the depth at which the workpiece exhibits maximum compressive residual stress. Alternately, a first high-intensity laser shock processing treatment is performed on the workpiece, followed by the removal of material from the compressive residual stress region, and then a second low-intensity laser shock processing treatment is performed on the workpiece. Material may be removed from the compressive residual stress region through a workpiece surface different from the laser shock processed surface. Material may also be deposited onto the laser shock processed surface.

An infrared seeker head for target tracking missiles has a main detector and an imaging optical system generating an image of a field of view on the main detector. The field of view contains a target such as an enemy aircraft. The missile is guided to the target in accordance with signals from the main detector. The target, if attacked by the missile, emits high-intensity laser radiation towards the missile as a counter-measure. This is to disturb the operation of the seeker head by dazzling or even destroying the main detector. The seeker head contains a device for defending against such disturbances. Various types of such defending devices are described. Incident light is deviated from the main detector. A second-quadrant-detector of reduced sensitivity guides the missile along the disturbing laser beam. Another embodiment uses attenuating optical elements in front of the main detector under the control of one or more second detectors.

Systems and methods are described that employ high-intensity lasers to set up a thin plasma sheet, also called a waveguide or “hot shell”, in the atmosphere as a function of beam intensity and geometry. A laser beam can be spread and directed with physical optics (e.g., lenses, mirrors, other optical elements, etc.) to generate a thin inverted cone-shaped hot shell waveguide in the atmosphere. The hot shell of the waveguide has a different index of refraction (n) from that of the surrounding air layers and as such serves to internally reflect portions of the entering solar rays entering an aperture in the hot shell, toward the tip of the cone and a solar energy storage component positioned there, thus providing a virtual solar energy concentration system. In another embodiment, the solar energy storage component shuts down or otherwise rejects incoming solar energy when fully charged, to mitigate damage to system components.

A high intensity lighting apparatus (400) includes an outer housing (402); a curved support disk (414) having an array of diode or laser-based integrated light source (410) attached thereto disposed within the housing. Each of the light source (110) includes a tube (112) having a laser or diode chip (111) at one end of the tube. The tubes each have at least one concave shaped exit surface (113) on an end opposite the chip, wherein the concave exit surface converges light emitted from each of the light source to focal points within the housing (402). A shape of the curved support disk (414) converges the respective focal points into a light beam having a common focal plane (441). Adjustable secondary optics (431) are disposed in the housing after the focal plane (441) for creating various angles of transmission of the light beam. The laser can be a diode laser, while the diode can be a light-emitting diode (LED).

The present invention is directed to the creation of zones of permanently altered refractive index characteristics in glass waveguiding devices, including optical fibers and optical waveguides pre-existed in a glass substrate. Such zones in which the refractive index has been permanently altered are created in glass using a very high intensity laser beam which is produced by focusing the light output from an ultrafast pulsed laser at a predetermined target region in the glass. The preferred laser is a Ti:Sapphire amplified, frequency-doubled Erbium-doped fiber laser system, providing light pulses of approximately 100 femtosecond duration, each with an energy of between about 1 nanojoule and 1 millijoule, and preferably at a pulse repetition rate of between 500 Hz and 1 GHz. The repetition rate is chosen to deliver pulses faster than the thermal diffusion time over the dimensions of the volume element being modified. This latter process is to accumulate heat to the point of liquefying the material in order to increase material compliance to the femtosecond writing process and increase the subsequent thermal barrier to relaxation of the written structural element and thereby increase the lifetime of the device or structural function. One or more zones of permanently altered refractive index characteristics can be formed in a waveguiding device, such as an optical fiber by utilizing a focused, pulsed, laser light source which generates a focal region having an intensity greater than the threshold for inducing permanent refractive index changes in the device. The focal region is aligned with the device and relative movement between the focal region and the device has the effect of sweeping the focal region across the device in a predetermined path. The result is a zone within the device in which the refractive index characteristics of the device have been permanently altered so as to control amplitude, phase, spatial propagation or polarization states of light within the material.

A beam terminator for a high-power laser beam comprises a thermally conductive body including a beam-trapping chamber. A tapered spiral channel extends into the conductive body for guiding the beam. The beam is partially absorbed while propagating along the channel to the trapping chamber. What remains of the beam is absorbed in the trapping chamber.

A fusion welding method includes the steps of: generating a hybrid laser beam obtained by mixing a low-intensity laser beam with a first high-intensity laser beam and a second high-intensity laser beam; moving the hybrid laser beam along a gap between a first member and a second member; and melting the first member and the second member in the periphery of the gap with the hybrid laser beam, and filling the gap with the melt of the first member and the melt of the second member to weld the first member and the second member, wherein the first high-intensity laser beam is applied to the area of the first member to which the low-intensity laser beam is applied, and the second high-intensity laser beam is applied to the area of the second member to which the low-intensity laser beam is applied.

Systems and methods are described that facilitate refueling a vehicle with electrical energy by targeting receiver thereon and pointing a high-intensity laser source at the receiver. Vertical multi-junction (VMJ) photocells receive the laser energy and convert the laser energy into electrical energy. The laser source can operate at a range of output power levels depending on the vehicle's energy needs. The laser source can be pulsed or continuous near-infrared laser source. A heat exchanger can be coupled to the receiver to dissipate laser energy not converted into electrical energy. If the vehicle has a propeller, the heat exchanger can be mounted to the vehicle in the propeller wash path.

A smoking device, such as a water pipe or a bong, having an integrated laser diode ignition source. The laser diode ignition source provides a long-lasting life span, and does not require the smoker to use a fuel-based lighter that is not recyclable and requires continuous refilling of the fuel cartridge. Furthermore, the laser diode ignition source does not leave any undesirable aftertaste to the organic material. The ignition source is located within a housing, protected from the environment and wind. The ignition source applies a high intensity laser beam to ignite organic material, such as smokable substances, locating within a bowl adjacent to the ignition source.

A laser drilling system (100) for drilling rocks, soil and engineering materials with the aid of high-intensity laser light is described, which comprises an optical drill (104) for supplying laser light for the drilling of said materials provided with sensors (106); a control and operations center (101) comprising computer and supervising software with integrated logic; a cooling and debris withdrawal system (105) an energy source (102); an energy conductor (103) provided with sensors (107) and laser systems (201) for emitting high-intensity laser light and optical fibers (123) for conducting the so-generated laser light, so that the information collected by sensors (106), (107) supply said control and operations center (101) and said control and operations center (101) determines improved operation conditions of the optical drill (104) for the drilling of said solid materials or mixtures of solid and liquid materials relative to state-of-the-art drilling systems. The drilling method employing the system of the invention is also described.

The invention discloses a fast dark-field detection method for surface microdefects of a large-caliber fused quartz optical element. The method includes the steps that firstly, a bright-field area array CCD microscope system is adopted to position the optical element so as to determine the position of the optical element in an absolute coordinate system; then, a spectral confocal ranging system is adopted to determine a high-intensity laser irradiation light-outlet surface equation of the optical element; finally, a dark-field linear array CCD microscope system is adopted to conduct one-way line-by-line fast raster scanning on the surface of the large-caliber fused quartz optical element moving precisely so as to obtain microdefect information, and the bright-field area array CCD microscope system is adopted to monitor the optical element on line. By means of the method, full-caliber automatic scanning for surface microdefects of the optical element is achieved, the detection efficiency is greatly improved, and the full-caliber fast scanning and detecting time for surface microdefects of the optical element can be controlled within 30 min.

The invention provides a high-strength laser welding method of a dissimilar metal assembly part. The high-strength laser welding method comprises the steps of (1) clamping an A metal upright post by adopting a positioning die, and keeping fixed; (2) heating the upper end of the A metal upright post to a softening state; (3) inserting the upper end of the A metal upright post which is induced, heated and softened into a copying hole of a B metal base so as to obtain a dissimilar metal laser welding preassembly part; (4) starting an ultrasonic vibration source connected with a positioning die assembly, and turning on laser, so that a laser welding head is driven to perform penetration fusion welding by an XYZ three-axis moving system along the contour line of the connecting surface of the A metal upright post and the B metal base; and (5) moving the dissimilar metal laser welding assembly part to a conveying belt, and then falling into a material box. According to the high-strength laser welding method, the welding effects of no filler, large penetration and narrow welding seam can be realized, so that the dimensional accuracy of the laser welding seam is greatly increased. The invention further provides a high-strength laser welding device of the dissimilar metal assembly part.

According to the present invention there is provided a method for preparing a lithographic printing plate, the method including the steps of(1) providing an imaging element including on a lithographic hydrophilic support as contiguous top layer a heat-sensitive coating including a compound capable of converting light to heat and a compound, which becomes more hydrophilic under the action of heat;(2) imagewise exposing the imaging heat-sensitive composition with a high intensity laser emitting a laser beam with an intensity at the surface of the heat-sensitive composition of tat least 2 mW/mum2 thereby at least partially removing the heat-sensitive composition to expose at least partially the lithographic support.

A system is provided for generating high-energy particles and for inducing nuclear reactions. The system includes a laser and for emitting a laser beam, an irradiation target for receiving the laser beam and producing high-energy particles, and a secondary target for receiving the high-energy particles, thereby inducing a nuclear reaction. A method is also provided including producing a laser beam of high-intensity with an ultra-short pulse duration, irradiating the laser beam onto an irradiation target in order to ionize the irradiation target and produce a collimated beam of high-energy particles, and colliding the collimated beam of high-energy particles onto a secondary target containing a nuclei, thereby inducing a nuclear reaction on the secondary target.

The invention discloses a self-repairing polymer material and a repairing method thereof. The self-repairing polymer material is characterized by being prepared from 0.2%-4% of functional nano-powder and the balance of a polymer; the repairing method of the self-repairing polymer material comprises the following steps: irradiating a wound surface with a moderate-strength laser beam for 1-10 minutes, and self-repairing and healing the polymer wound. The nano-powder with a solar-thermal conversion function is adopted; a restoration agent containing an unsaturated olefin monomer is not adopted, so that the environmental pollution is avoided; the resin can be repaired only by physical action; the problem that the product performance is reduced due to broken polymer molecular chain caused by high-strength laser is avoided; and the preparation process is simple and feasible; and the production cost is low.

The invention provides an optical tweezers control method based on hollow light dimension adjustment and an optical tweezers control device based on hollow light dimension adjustment. The optical tweezers control method comprises the steps that one modulated laser beam and another modulated laser beam are incident to a nonlinear medium and hollow light is acquired; the hollow light is expanded andcollimated and then divided into two beams of child hollow light through a third polarizing beam splitting cube; the two beams of child hollow light is the first child hollow light and the second child hollow light; the first child hollow light is incident to a first imaging device; the second child hollow light is converged to a sample pool through a fourth focusing lens, wherein sample participles are sprayed in the sample pool and the sample participles are captured at the light trap position by the second child hollow light; and movement of the sample participles is adjusted by adjustingthe light intensity of the modulated laser beams. The phase of the modulated laser beams is changed by the modulated laser beams so that the modulated laser beam far field light intensity distributionpresents in a way that the middle intensity is zero and the surrounding is a circle of high intensity laser, and then three-dimensional operation is performed on the light absorbing particles in theair by using the dimension adjustable hollow light beams.

The invention discloses a measurement method of chirp characteristics of linear chirp pulses, and belongs to the linear optics measuring technologies. The measurement progress includes the steps that femtosecond laser pulses are divided into two beams by a light splitting sheet, one beam serves as reference pulses, and the other beam is stretched by a pulse stretcher to serve as to-be-measured chirp pulses; the two beams enter a spectrograph successively in a coaxial transmission mode to form frequency spectrum interference fringes; chirp pulse spectrums and the frequency spectrum interference fringes of different kinds of delay time are collected, and then chirp characteristic parameters of the chirp pulses are obtained through simple data processing. The method needs neither nonlinear material nor high-strength laser condition, can measure the linear chirp pulses of picosecond even subpicosecond levels, and is high in measurement accuracy.

A method for activating particles for internal radiopharmaceutical use, said particles comprising precursor nuclides to be activated, is disclosed. The method comprises: directing a high-intensity laser beam onto converting means to produce an irradiating field; and irradiating said particles comprising precursor nuclides in said irradiating field to activate said precursor nuclides, thereby obtaining radiolabeled particles.

To prevent an inadvertent output of high intensity laser beam toward an observer. A projector of rear-projection type comprises a light source 101 that outputs a laser beam and a scanner 106 that scans a screen 120 with the laser beam. In the projector, when a laser beam with energy exceeding an accessible emission limit due to failure of the light source 101 or the scanner 106 is outputted, at least one optical member (a lens optical system 103, a scanner 106, a reflection mirror 109, a screen 120 or the like)located in an optical path of the laser beam is arranged so as to be broken or altered in quality and to prevent the beam with energy exceeding the accessible emission limit from being output from the screen 120.