Patents Examined by B. R. R. Holloway
  • Patent number: 4867510
    Abstract: A device and method for doubling the frequency of electromagnetic radiation of a given frequency are described. The device comprises a substrate (1) on which is provided a first layer (2) and a second layer (3). One of the first and second layers (2) has a plasma oscillation frequency equal to the given frequency for causing an electric field at twice the given frequency to be produced across the device in response to electromagentic radiation at the given frequency being incident on the device normally of the first and second layers (2and 3). A thus-produced electric field is converted to electromagnetic radiation at twice the given frequency by the said other of the first and second layers (3) which forms a waveguide for electromagnetic radiation at twice the given frequency. A further layer (2') similar to the said one layer (2) may be provided so that the said other layer (3) is sandwiched between the said one and further layers (2 and 2').
    Type: Grant
    Filed: March 16, 1989
    Date of Patent: September 19, 1989
    Assignee: U.S. Philips Corp.
    Inventor: Peter J. Dobson
  • Patent number: 4866729
    Abstract: To generate atomic iodine in the fundamental state, a combustion reaction between a combustion supporter and a fuel, of which one at least is an iodine compound, are injected into a chamber. Means to enable the two products to be measured out with an excess of the iodine compound with respect to the stoichiometric proportions of the combustion and means to initiate the combustion reaction are provided.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: September 12, 1989
    Assignee: Office National d'Etudes et de Recherches Aerospatiales
    Inventors: Claude Verdier, Bruno Leporcq, Eric Georges, Roger Barraud
  • Patent number: 4866499
    Abstract: A photosensitive diode element and method of manufacture. The diode element is comprised of a first layer of n-type hydrogenated amorphous-silicon forming a cathode, and a second layer of p+ type material forming an anode, the second layer overlying the first layer and being transparent to optical energy. As a result of using hydrogenated amorphous-silicon, the phtosensitive diode element according to the present invention has characteristics of high photoconductivity, controllably variable optical gap, and thin film structure. A photosensitive diode array formed from the subject diode elements is easily fabricated, employs straightforward circuitry for addressing each diode element, and is characterized by low crosstalk between elements, maximized optical sensitivity and broad dynamic range.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: September 12, 1989
    Assignee: Mitel Corporation
    Inventor: Metin Aktik
  • Patent number: 4866720
    Abstract: A method for efficiently producing a multicolored laser beam. The second harmonic of a 1.06 micron wavelength laser beam is produced from a YAG laser. The second harmonic has a wavelength equal to 0.53 micron. The second and third harmonics of a 1.32 micron wavelength laser beam are simultaneously produced from a second YAG laser. The second harmoic has a wavelength equal to 0.66 micron and the third harmonic has a wavelength equal to 0.44 micron. The produced harmonics from the previous steps are combined to form a multicolored laser beam.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: September 12, 1989
    Assignee: Rockwell International Corporation
    Inventor: Sandor Holly
  • Patent number: 4863387
    Abstract: A separable connector for mounting printed circuit boards which permits easy removal or swiveling for repair or replacement. The connector has a chassis or surface mounting header having a plurality of solder connections to interconnect with main circuits. The header has sockets with latches for receiving mounting pins on a cylindrical connector securely attached to a printed circuit board with rivets and solder connections. The cylindrical connector has wrap-around contacts on a cylindrical shaft mating with concave contacts on the header which maintain electrical contact as the circuit board swivels.
    Type: Grant
    Filed: December 22, 1987
    Date of Patent: September 5, 1989
    Inventors: Alvin A. Snaper, Jerome D. Snaper
  • Patent number: 4864583
    Abstract: The turn-on delay of a gas laser is significantly reduced by creating a region of higher electric field intensity between the plasma discharge-confining region of the laser and the laser anode. This is accomplished by creating one or more regions of higher conductivity along the surfaces of the laser tube structure. In one embodiment, a conductive strip is placed upon the surface of the capillary tube containing the plasma discharge. In other embodiments, a second electrode for concentrating the electric field in the preferred region of the tube is included.
    Type: Grant
    Filed: April 14, 1988
    Date of Patent: September 5, 1989
    Assignee: Uniphase Corporation
    Inventors: Dale E. Crane, Yi Qin
  • Patent number: 4864584
    Abstract: A laser device having a support structure of unitary form including having connected first and second portions, the first of which extends outwardly from the connection portion to a free end which is defined by a groove and spaced surfaces on opposite sides thereof. A crystal gain medium is positioned in the groove and diode laser pump sources are located on opposite sides of the groove on the spaced surfaces and are constructed of heat sink members attached to the surfaces and a plurality of laser diodes mounted on selected ones of the heat sinks in positions to optically couple the laser diode outputs to the crystal gain medium rod.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: September 5, 1989
    Assignee: Laser Diode Products, Inc.
    Inventor: Danny W. Martin
  • Patent number: 4864260
    Abstract: The present invention relates to a clamping device for joining two waveguides used for propagating microwaves. The waveguides are of the type comprising hollow microwave propagation channels having at their meeting ends connection flanges in abutting relationship, the flanges being provided with aligned openings. The clamping device comprises a top wall and a pair of generally parallel side walls depending from the top wall. A metallic pin is mounted to one of the side walls and projects toward the other side wall which is provided with a cut-out portion facing the pin. In use, the pin is inserted through a pair of aligned openings in the flanges and the clamping device is pressed toward the flanges to turn about the axis of the pin until the flanges are deeply received between the side walls.
    Type: Grant
    Filed: January 4, 1988
    Date of Patent: September 5, 1989
    Assignee: Lab-Volt (Quebec) Ltd/Ltee
    Inventor: Bertrand Huard
  • Patent number: 4862473
    Abstract: A semiconductor laser apparatus includes a groove of a specified length that is formed by etching an end portion of a semiconductor laser element, and a higher harmonic generating device having a waveguide of approximately the same cross-sectional dimensions as the dimensions of the resonator that is mounted in the semiconductor laser element. The higher harmonic generating device is secured by being fused in the groove with the optical axis of the waveguide coinciding with the optical axis of the resonator.
    Type: Grant
    Filed: October 8, 1987
    Date of Patent: August 29, 1989
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Seiki Yano, Toshiki Hijikata
  • Patent number: 4862469
    Abstract: The subject invention relates to method of suppressing one of the counterpropagating intracavity pulses generated in a dye laser synchronously pumped by the output of a mode locked Q-switched pump laser. The method includes extracting a portion of one of the pulses generated in the cavity such that the other pulse experiences a greater effective gain. The pulse with the highest effective gain will dominate the other pulse and at the steady state only one pulse will exist in the cavity. In the preferred embodiment, a double pass acousto-optic cell is used to extract the both the unwanted pulse and, at a later time, the high energy, useful pulse. In this case, maximum efficiency is achieved by placing the dye cell at one of a number of well defined locations within the optical cavity.
    Type: Grant
    Filed: October 10, 1986
    Date of Patent: August 29, 1989
    Assignee: Coherent, Inc.
    Inventors: Bernard Couillaud, Gerald M. Mitchell
  • Patent number: 4862468
    Abstract: A first embodiment includes a set of diffraction gratings on the face of a wheel, each grating being set at an angle to select a different spectral line. The wheel is rotated, and as each grating moves into the end-reflector position of the laser's optical path, the laser is fired. Alternate embodiments include a small spinning fold mirror that reflects the beam in a circle about the axis of the laser.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: August 29, 1989
    Assignee: Hughes Aircraft Company
    Inventor: David Fink
  • Patent number: 4862466
    Abstract: A laser emitting apparatus comprising a semiconductor laser and drive unit for applying an excitation current to the semiconductor laser to cause the semiconductor laser to emit a laser beam. A photoreceptor accepts the laser beam and outputs a signal corresponding to the intensity of the laser beam. A first control unit is provided which is operable in response to the signal output from the photoreceptor for controlling the excitation current in order to maintain the laser beam at a predetermined intensity. The apparatus further comprises a unit for outputting an interrupt signal for interrupting the emission of the laser beam, and a second control means unit operable in response to the interrupt signal for reducing the excitation current below a predetermined intensity level regardless of controls effected by the first control unit.
    Type: Grant
    Filed: September 16, 1987
    Date of Patent: August 29, 1989
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Tatsuya Eguchi
  • Patent number: 4858240
    Abstract: An arrangement for the generation of CO.sub.2 laser pulses of high power. In a first step, the laser medium is brought by an electrical pumping pulse into a state of extremely high population inversion and, in a second step, this inversion is decayed suddenly by a Q-switching effect in such a manner, that radiation pulses of extreme power magnification arise. The power is supplied to the laser-gas discharge by a power-supply unit which permits the pulsed supply of pumping energy. The associated laser resonator is formed froma first resonator mirror with a fixed reflectivity R.sub.1,frequency-selective element,a special, highly angle-selective gas discharge tube,and a special component material transparent to the laser radiation that functions as a second resonator mirror with a variable reflectivity R.sub.2. The second unit is comprised of a modulator with a high cutoff frequency in the form of a Fabry-Perot interferometer arrangement with a rapidly changeable optical wavelength.
    Type: Grant
    Filed: November 26, 1986
    Date of Patent: August 15, 1989
    Assignee: VEB Kombinat Feinmechanische Werke Halle
    Inventors: Manfred Pohler, Gisbert Staupendahl, Richard Wittig
  • Patent number: 4858242
    Abstract: Improvement in a laser having a solid transparent housing with two cavities for respectively holding a laser rod and a pump lamp. The rod is embedded along its total length within the housing; the pump lamp is embedded along its total arc and over a substantial length of each of its electrode regions within the housing. clearance between lamp envelope and housing is held to close tolerances. Optional beam tubes provided at the end of the rod at the housing shield the laser beam from thermal distortion. Flashlamps having a cerium-doped quartz envelope are particularly desirable for pumping this laser.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: August 15, 1989
    Assignee: Allied-Signal Inc.
    Inventors: Jerry W. Kuper, William E. Langert, Joseph J. Barrett
  • Patent number: 4856012
    Abstract: An apparatus for controlling light output of a pulse-excited laser oscillator which detects the energy level of laser light output and controls a driving circuit to interrupt the application of a driving voltage to a flash lamp when the level of laser light output is equal to a predetermined level so that a stable laser light output is obtained in each pulse in real time.
    Type: Grant
    Filed: August 4, 1987
    Date of Patent: August 8, 1989
    Assignee: NEC Corporation
    Inventor: Hiroo Takenaka
  • Patent number: 4856016
    Abstract: A gas laser tube comprises an elongated insulative envelope for containing a laser active medium therein, and an anode electrode and a cathode electrode provided in the elongated envelope for an electric discharge therebetween within the envelope. The anode electrode is formed of a metallic disc having an outer surface in ceaseless contact with an inner surface of the envelope. Further, the metallic disc having at least one slot formed in the outer surface thereof to extend between a pair of opposite end surfaces of the metallic disc.
    Type: Grant
    Filed: July 31, 1987
    Date of Patent: August 8, 1989
    Assignee: NEC Corporation
    Inventor: Takashi Kanamoto
  • Patent number: 4856009
    Abstract: The disclosure is directed to a method and apparatus for precisely controlling the frequency of a laser, and for precise control of distance. In a disclosed embodiment, a laser beam is split, modulated to obtain a frequency differential, and coupled to an interferometer which is designed to produce two processed beams having intensities that vary at the same ac frequency, but at a phase difference that is indicative of the laser frequency. The processed beams are converted to ac electrical signals which are coupled to phase control circuitry. The phase control circuitry determines the phase between the electrical signals and produces a control signal for controlling the laser frequency. Phase offset increments are introduced in the phase detection process, these phase offset increments resulting in controlled changes in the laser frequency. The laser frequency can be computed and read out as a function of the phase offset increments.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: August 8, 1989
    Assignee: University Patents, Inc.
    Inventors: John L. Hall, Miao Zhu
  • Patent number: 4853933
    Abstract: A radiation generator in which substantially all the radiation modes are locked with respect to one another comprises a radiation generating cavity defined by mirrors and a crystal for generating a continuous train of non-transform limited pulses of coherent radiation. An external cavity is positioned in association with the radiation generating cavity whereby radiation may pass in use in both directions between the two cavities. The external cavity is defined by a medium having a non-linear transmission characteristic which may be substantially non-dispersive for radiation from the generating cavity, and/or which has a negative group delay dispersion. The radiation path length is such that pulses fed into the external cavity are fed back to the radiation generating cavity in synchronism with a later pulse from the generating cavity.
    Type: Grant
    Filed: September 30, 1987
    Date of Patent: August 1, 1989
    Assignee: British Telecommunications
    Inventors: Keith J. Blow, David C. Wood
  • Patent number: 4850762
    Abstract: A sealing mechanism acts between a quick-change tool holder and a tool adapter receivable therein. The sealing mechanism is an elastomer seal in the form of a V-flange elastomer seal ring mounted on a metal member which has a coaxial cylindrical outer surface and an axially inwardly facing shoulder to establish the elastomer seal member in position. This seal member has a generally conical seal member first portion with an external peripheral surface engaging a planar surface on the quick-change tool holder. This prevents contaminants, such as fine chips, from entering the interior of the quick-change tool holder. The foregoing abstract is merely a resume of the one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
    Type: Grant
    Filed: December 17, 1987
    Date of Patent: July 25, 1989
    Assignee: Kennametal Inc.
    Inventor: Valdas S. Ramunas
  • Patent number: 4852106
    Abstract: An optical system for producing an optical output having a beat frequency. The shifter has a beam splitter for splitting a laser radiation generated by a laser source, into a first and a second laser beam, and includes an acoustooptical modulator for deflecting the first laser beam and thereby changing the frequency of the first laser beam. The shifter further has an optical-path changing device such as a convex lens or parabolic reflector for changing an optical path of the first laser beam deflected by the acoustooptical modulator, into parallelism with the optical axis of the changing device. The focal point of the optical-path changing device is located at a point of emission of the deflected first laser beam. A mixer is provided for mixing the deflected first laser beam with the second laser beam, thereby causing an interference between the first and second laser beams, to produce a beat frequency equal to a difference between the frequencies of the first and second laser beams.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: July 25, 1989
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Motohito Hino, Yoshinori Bessho