170 results about "Infrared laser beam" patented technology

A head mounted display system with at least one retinal display unit having a curved reflector positioned in front of one eye or both eyes of a wearer. The unit includes a first set of three modulated visible-light lasers co-aligned and adapted to provide a laser beam with selectable color and a first scanner unit providing both horizontal and vertical scanning of the laser beam across a portion of the curved reflector in directions so as to produce a reflection of the color laser beam through the pupil of the eye onto a portion of the retina large enough to encompass the fovea. The unit also includes a second set three modulated visible-light lasers plus an infrared laser, all lasers being co-aligned and adapted to provide a color and infrared peripheral view laser beam, and a second scanner unit providing both horizontal and vertical scanning of the visible light and infrared laser beams across a portion of the curved reflector in directions so as to produce a reflection of the scanned color and infrared laser beams through the pupil of the eye onto a portion of retina corresponding to a field of view of at least 30 degrees×30 degrees.

A laser beam delivery system is disclosed, which allows transmission of high-power infrared light through a hollow core photonic band gap (HC-PBG) fiber made of non-silica-based glass. In this system, the infrared beam first passes through input coupling optics which focus the beam onto the hollow core of the HC-PBG fiber. In front of the input end of the HC-PBG fiber, there is provided a mask with a hole aligned with the hollow core, and the infrared beam first passes through this hole before entering the hollow core of the HC-PBG fiber. This protects the photonic band gap structure from being damaged by the beam. After passing through the HC-PBG fiber, which may be from one to several hundred meters in length, the infrared beam exits at the output end of the fiber and passes through output coupling optics which collimate and focus the beam onto a desired target. The various components of the system may be water cooled during the operation or subjected to a gas purge to prevent condensation or gas ionization.

An optical parametric oscillator (OPO) is described that efficiently converts a near-infrared laser beam to tunable mid-infrared wavelength output. In some embodiments, the OPO includes an optical resonator containing a nonlinear crystal, such as periodically-poled lithium niobate. The OPO is pumped by a continuous-wave fiber-laser source having a low-power oscillator and a high-power amplifier, or using just a power oscillator). The fiber oscillator produces a single-frequency output defined by a distributed-feedback (DFB) structure of the fiber. The DFB-fiber-laser output is amplified to a pump level consistent with exceeding an oscillation threshold in the OPO in which only one of two generated waves (“signal” and “idler”) is resonant within the optical cavity. This pump source provides the capability to tune the DFB fiber laser by straining the fiber (using an attached piezoelectric element or by other means) that allows the OPO to be continuously tuned over substantial ranges, enabling rapid, wide continuous tuning of the OPO output frequency or frequencies.

A head worn display system with at least one retinal display unit having a curved reflector positioned in front of one eye or both eyes of a wearer. The unit includes a first set of three modulated visible-light lasers co-aligned and adapted to provide a foveal laser beam with selectable color and a first scanner unit providing both horizontal and vertical scanning of the laser beam across a small portion of the curved reflector in directions so as to produce a reflection of the color laser beam through the pupil of the eye onto a portion of the retina large enough to encompass the fovea. The unit also includes a second set three modulated retinal visible-light lasers plus an infrared laser, all lasers being co-aligned and adapted to provide a color and infrared peripheral view laser beam, and a second scanner unit providing both horizontal and vertical scanning of the visible light and infrared laser beams across a portion of the curved reflector in directions so as to produce a reflection of the scanned color and infrared laser beams through the pupil of the eye onto a portion of retina corresponding to a field of view of at least 30 degrees×30 degrees.

An optical head is provided for a free space optical communications system. The optical head is utilized for transmitting and receiving modulated infrared laser beams. The optical head includes an optical amplifier, a circulator, an ultrafine-steering element, a fine-steering element, a course-steering element, and a fine track sensor. Additionally, a method is provided for facilitating airborne free space optical communications between an airborne host platform and a link platform. Each platform has an optical head which transmits and receives data via modulated infrared laser beams, wherein the host includes at least an optical head having a fine, coarse, and ultrafine steering element configured in a cascaded three-tier steering element architecture.

A laser beam source and an operating method thereof is provided for a directional infrared countermeasures (DIRCM) weapon system for defensively countering guided missiles having infrared seeking heads, by directing an infrared laser beam at the guided missile so as to disorient, saturate, or irreversibly destroy the IR detectors and circuitry arranged in the target seeking head. The power, pulse frequency and spectral composition of the laser beam is adjustable and selectable as required to adapt to any particular defensive engagement. To achieve this, the laser beam source comprises an Nd:YAG pumping laser and an optical parametric oscillator including an oscillator crystal arranged in a resonator cavity. The crystal includes a plurality of different periodically polarized crystal zones having different lattice constants. The adjacent zones can be grouped together into selectable crystal zone groups. The beam cross-section of the pumping laser beam corresponds to the cross-section of a single crystal zone or of a crystal zone group encompassing plural zones. The crystal is arranged on a slide table that is slidably displaceable by a servomotor, to move a selected crystal zone or group into the path of the pumping laser beam. Thereby the wavelength components and the relative intensities thereof of the output laser beam can easily be selectively adjusted.

A semiconductor laser device includes a substrate which is made of, e.g., silicon and which has in its principal surface first and second recessed portions formed at a distance from each other. Disposed in the first recessed portion is a first semiconductor laser chip in the form of a function block, which emits an infrared laser beam. Disposed in the second recessed portion is a second semiconductor laser chip in the form of a function block, which emits a red laser beam.

This invention relates to a method and apparatus for improved process control in combustion applications, and particularly those relating to the steelmaking industry. An apparatus is provided for process control in a combustion application comprising a laser to transmit a near-infrared laser beam through off-gas produced by the combustion application, a detector to detect the transmitted laser beam and convert the detected laser beam to an electrical signal, and a control system for providing adjustment of select inputs to the combustion application in response to the electrical signal from the detector. The method of this invention comprises transmitting a near-infrared laser beam through off-gas produced by the combustion application, detecting the transmitted laser beam, and adjusting select inputs of the combustion application in response to the detected transmitted laser beam.

A compact optically-pumped solid-state laser designed for efficient nonlinear intracavity frequency conversion into desired wavelengths using periodically poled nonlinear crystals. These crystals contain dopants such as MgO or ZnO and/or have a specified degree of stoichiometry that ensures high reliability. The laser includes a solid-state gain media chip, such as Nd:YVO₄, which also provides polarization control of the laser; and a periodically poled nonlinear crystal chip such as PPMgOLN or PPZnOLT for efficient frequency doubling of the fundamental infrared laser beam into the visible wavelength range. The described designs are especially advantageous for obtaining low-cost green and blue laser sources.

The invention discloses an infrared temperature measurement detection method for detecting solder joint reliability of a circuit board, which belongs to the technical field of faulty soldering detection of solder joints and solves the problem that the prior method cannot detect the faulty solder point of which the appearance is normal. The infrared temperature measurement detection method comprises the following steps of: 1, concentrating an infrared laser beam emitted by an infrared laser device on a solder joint to be detected of the circuit board, using a thermal infrared imager to obtain a dynamic image of the solder joint to be detected and a dynamic image of a lead wire part of the solder joint to be detected, and getting temperature distribution curves of the solder joint to be detected and the lead wire part of the solder joint to be detected; 2, overlaying the temperature distribution curve of the solder joint with that of the lead wire part of the solder joint to be detected according to same proportion; 3, judging the overlaying result: when the two temperature distribution curves have same distribution trend, and the highest temperature points on the two temperature distribution curves are synchronous, judging that the solder joint to be detected is a qualified solder joint; otherwise, judging that the solder joint to be detected is unqualified. The infrared temperature measurement detection method is suitable for detecting the solder joint reliability of the circuit board.

Commercial aircraft are protected from attack by infrared seeking guided missiles through the utilization of a ground-based directed infrared countermeasure system in which the deployment of an IR guided missile is detected off-aircraft and more particularly on the ground. An infrared laser beam is projected towards the detected missile such that the projected laser infrared radiation impinges upon the missile from the rear. The off-axis infrared radiation illuminates the IR transmissive dome at the head of the missile where it is internally reflected back towards the IR detector carried by the missile through the total internal reflection characteristics of the dome. The domes of these missiles are typically made of a high index of refraction IR transmissive materials such that the material is prone to total internal reflection. The infrared laser generated radiation is a modulated so as to interfere with the guidance system of the missile causing it to execute a turn and plunge to the ground. In one embodiment, the long wavelength infrared laser is a 100-W laser with a beam width of 100 microradians, thus to provide a zone of protection of about three miles.

The invention discloses a normal displacement and angle sensing optical measuring head and a measuring method thereof, optical measuring head laser light which is sent out by a semiconductor laser sequentially passes through a spectro-grating, a spectroscope and a reflecting mirror to be collimated into the collimated light beam, and the collimated light beam is reflected via a right-angle prism to enter a microobjective; the light beam which is reflected by an object to be measured returns back according to the same way to the spectroscope, and then is focused on a four-quadrant detector through an astigmatic lens; and laser light which is sent out by an infrared laser light source sequentially passes through a light guide optical fiber, a collimating lens and a focus lens to be focused on an infrared reflecting mirror to form a focus point which is superposed with the front focus of the microobjective, the infrared laser light is vertically reflected into the microobjective through the infrared reflecting mirror, the parallel infrared laser beam which is exited from the microobjective is reflected to the microobjective through the object to be measured, and an infrared beamsplitter reflects the returned infrared laser beam onto a two-dimensional phase-sensitive detector (PSD). The measuring head and the measuring method thereof can be effectively used for geometrical error measurement and calibration of the three freedom degrees of a linear guide rail, surface topographic reconstruction of a free-form surface and the like.

The present invention discloses a long-distance laser barrier clearing system, belonging to the field of photoelectric technologies and being applied to fields of maintenance of overhead transmission lines, long-distance explosion, barrier clearing of toxic chemical environments, and so on. The long-distance laser barrier clearing system includes a support. An infrared laser is disposed above the support. A holder for adjusting a horizontal direction and a pitch angle of the infrared laser is disposed between the support and the infrared laser. An adjustable condenser lens is arranged at the front end of the infrared laser. The adjustable condenser lens is internally provided with a lens group for diffusing and focusing the infrared laser beam. An optical sighting telescope for observing sundry processing conditions is arranged above the tail end of the infrared laser. A visible light indicator is arranged above the front end of the optical sighting telescope. The infrared laser is connected with a power case by using a power line. Compared with the prior art, the long-distance laser barrier clearing system has the advantages of lowering labor intensity, reducing cost, and improving working efficiency and security.

Electronic devices may be provided with display structures such as glass and polymer layers in a liquid crystal display. The glass layers may serve as substrates for components such as a color filter layer and thin-film transistor layer. The polymer layers may include films such as a polarizer film and other optical films. During fabrication of a display, the polymer layers and glass layers may be laminated to one another. Portions of the polymer layers may extend past the edges of the glass layers. Laser cutting techniques may be used to trim away excess portions of the polymer layer that do not overlap underlying portions of the glass layers. Laser cutting may involve application of an adjustable infrared laser beam.

An ordinary golf ball is cleaned and then heated with an emulsion depositing in the dimples a hologram having the capacity to reflect a pre-selected wavelength of laser-beam. If a player temporarily losses such ball, a hand-held unit directs an infra-red laser beam of said pre-selected wavelength, desirably one not absorbed by atmospheric moisture, such as 1310 nm. Said hand-held unit contains an analyzer evaluating the light reflected back to such analyzer and attributable to such laser bean of said pre-selected wave-length. By evaluating the intensity of such reflected light, the golfer can target the location of the temporarily lost ball. Upon approaching the lost ball the angle at which the unit would be held would be modified for focusing on the lost ball. Earphones, meters, or other diagnostic equipment can monitor the intensity of the light reflected back from such laser beam. Such hand held analyzer of reflected light involves an investment which is small enough that a golf club can include the rental of such a unit as a part of the rental for a golf cart. Preliminary estimates indicated that any country club failing to utilize the present invention will encounter greater losses from lost balls than those practicing the present invention, because the cost of periodically regenerating the hologram for a ball represents such a small fraction of the cost of a replacement ball.

The invention discloses a method and a system for measuring the depth resolution attenuation coefficient of a sample based on OCT. According to the rule that the attenuation coefficient is different due to the fact that the concentration of the particle is different, the internal microstructure of medium space can be imaged by measuring the optical attenuation coefficient of the resolution of the medium space. Near-infrared laser beams adopt the single-time scattering manner when passing by a sample shallow layer area, and adopt the multi-time scattering manner when passing by a deep area. According to the method and the system, a single-time scattering model for depth resolution is adopted for measuring the scattering coefficient of the sample shallow layer area, and the scattering coefficient of the sample deep area is measured by adopting a multi-time scattering model based on the extended Huygens-Fresnel principle and combining with a segmentation fitting technology. Interference spectrum signals collected from the OCT system are subjected to data processing, the strength data of the OCT can be correspondingly converted into shallow layer and deep layer attenuation coefficient data, the reconstructed shallow layer high-spatial-resolution scattering coefficient image and deep layer high-measurement-accuracy scattering coefficient image are spliced, and the high-resolution and high-measurement-accuracy attenuation coefficient imaging of the sample can be realized.

The invention discloses a multilayered photosensitive material for processing into a flexographic printing plate by direct patterning with an infrared laser beam. The multilayered material comprises: (A) a substrate; (B) a photosensitive resinous layer having sensitivity to light excepting infrared light and comprising (b1) an elastomeric binder resin, (b2) a polymerizable monomeric compound and (b3) a polymerization initiator formed on the substrate (A); (C) a barrier layer of a composition comprising a resin such as a polyvinyl pyrrolidone and alkali-soluble cellulose compounds, which transmits light other than infrared light and is removable in the development treatment, formed on the photosensitive resinous layer (B); and (D) a masking layer of a composition comprising (d1) a film-forming binder resin, (d2) an infrared absorbing compound and (d3) a compound having no transmissivity to lights other than infrared light and removable by irradiation with an infrared laser beam, formed on the barrier layer (C).

The invention discloses a flip-chip welding spot defect back view temperature measurement detecting method, and relates to a detecting method of chip welding spot defects. In order to overcome the defect that an existing detecting technology cannot satisfy actual production demands, flip-chip welding spot defects are detected according to the method that a thermal imager and an infrared laser are arranged on one side of a base of a flip-chip respectively, the infrared laser device is flush with a flip-chip base welding disk to be detected, power and pulse width parameters are adjusted, thermal excitation is conducted on the welding disk, the thermal imager detects the temperature rising process of the base welding disk to be detected in real time, and at the same time, a thermo-gram of a temperature rising highest point is observed and shot. Therefore, the welding spot defects are judged according to a temperature rise curve and the thermo-gram. A spot-by-spot detecting method is adopted in the flip-chip welding spot inveracious welding detecting method, and therefore the flip-chip welding spot inveracious welding detecting method has the advantages of being free of abrasion, high in defect identification rate, and visual and simple in judging. In addition, technological range of application is wide, the method is also applicable to defect detecting during chip side ball embedding and defect detecting during base side ball embedding in three-dimensional assembling.

The invention relates to a method of atmospheric liquid mass spectrometry analysis, which comprises the following steps: shooting a liquid sample with a laser beam, wherein, the liquid sample comprises medium and solution of specimen and solvent; the medium transferring energy to the specimen and assisting the specimen desorption; the desorbed specimen combining with a charged particle generated with an electrospray ionization unit to form a specimen ion; the specimen ion entering a mass analyzer and generating a mass spectrometry analysis result. Furthermore, if the solution is water solution, mass spectrometry analysis result also can be obtained through shooting the solution directly with an infrared laser beam without adding medium. The invention has the advantages that mass spectrometry analysis results with high reliability of one or more liquid samples are obtained quickly without complicated pretreatment. The invention also provides a mass spectrograph for performing the method, which comprises a bearing unit for laying the liquid sample, a mass analyzer, a detector, an electrospray ionization unit, and a laser desorption unit.