Patents Examined by Galen J. Hansen
  • Patent number: 5123027
    Abstract: In a thin film micro-optic gyroscope (MOG) (10) a waveguide resonator structure (14) has an optical transmission path formed within a surface of a substrate (12). In one embodiment the path includes a predetermined amount of dopant (12a) for providing regenerative gain to radiation of a predetermined wavelength propagating through the path. The dopant is provided at a predetermined concentration and is substantially uniformly distributed throughout the path. By example, the substrate is comprised of neodymium-doped glass. A pump source is optically coupled to the path for exciting the dopant to emit radiation, the pump source providing radiation at a wavelength of approximately one-half of the predetermined wavelength. For the example of neodymium-doped glass the predetermined wavelength is 1.06 microns.
    Type: Grant
    Filed: June 13, 1990
    Date of Patent: June 16, 1992
    Assignee: Northrop Corporation
    Inventor: Anthony W. Lawrence
  • Patent number: 5123022
    Abstract: In a laser system for converting infrared laser light waves to visible light comprising a source of infrared laser light waves and means of harmoic generation associated therewith for production of light waves at integral multiples of the frequency of the original wave, the improvement of said means of harmonic generation comprising a crystal having the chemical formulaX.sub.2 Y(NO.sub.3).sub.5 .multidot.2 nZ.sub.2 owherein X is selected from the group consisting of Li, Na, K, Rb, Cs, and Tl; Y is selected from the group consisting of Sc, Y, La, Ce, Nd, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Al, Ga, and In; Z is selected from the group consisting of H and D; and n ranges from 0 to 4.
    Type: Grant
    Filed: October 16, 1990
    Date of Patent: June 16, 1992
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Christopher A. Ebbers, Laura E. Davis, Mark Webb
  • Patent number: 5117436
    Abstract: A solid state laser rod of an anisotropic material is more efficiently side pumped by using cylindrical lenses and a half-wave plate with linear laser diode arrays disposed along the length of the solid state laser rod such that the polarization of the diode array light is rotated to achieve a maximum absorption coefficient in the laser rod material. In addition, Fresnel reflection losses at the lens and laser rod surfaces are reduced by a 90.degree. polarization rotation.
    Type: Grant
    Filed: March 29, 1990
    Date of Patent: May 26, 1992
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Frank Hanson
  • Patent number: 5109388
    Abstract: A long pulse, fast flow laser system and method in which a laser having a gas inlet and a gas outlet and electrical discharge electrodes has its inlet connected through a valve to a source of laser gas and its outlet connected to a vacuum. A control circuit opens the valve upon a request for laser firing. The valve permits the laser gas to flow through the laser to the vacuum at high speed. A high-voltage power supply is triggered, creating an electrical discharge across the electrodes. After the end of the laser pulse, the valve is shut to cut off the flow of laser gas and the vacuum is reconstituted.
    Type: Grant
    Filed: September 24, 1990
    Date of Patent: April 28, 1992
    Assignee: Laser Engineering, Inc.
    Inventor: Robert I. Rudko
  • Patent number: 5095489
    Abstract: A semiconductor laser device having a pair of cavity facets provided confronting to each other and conducting a laser oscillation at wavelength .lambda., includes a reflection film having a reflectivity R.sub.1 against a laser light of wavelength .lambda. provided on one of cavity facets among the pair of cavity facets, and partial reflection films having a reflectivity R.sub.2 higher than the reflectivity R.sub.1 against laser light of wavelength .lambda., provided at a plurality of portions of the laser oscillation regions in parallel with each other on the reflection film. Therefore, a semiconductor laser device in which the active layer emits light uniformly without arising filamentation is obtained.
    Type: Grant
    Filed: September 21, 1990
    Date of Patent: March 10, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yutaka Nagai, Kenji Ikeda
  • Patent number: 5089727
    Abstract: A modulator circuit provides pulses of electrical energy to an electrical load in response to a trigger signal. A normally nonconductive Mosfet is included in a series circuit path with the electrical load and a capacitor. A silicon controlled rectifier (SCR) is coupled to the gate electrode of the MOSFET. A trigger signal renders the SCR conductive to thereby render the MOSFET conductive which discharges the capacitor through the electrical load to provide a pulse of electrical energy having a rapid rise time to the electrical load. The electrical load can be a laser diode which emits a pulse of light for use in an optical ranging device in response to the pulse of electrical energy. The accuracy of the ranging device is proportional to the rise time of the pulse of light.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: February 18, 1992
    Assignee: Motorola, Inc.
    Inventors: Lawrence H. Molitor, Edward J. Stearns
  • Patent number: 5088095
    Abstract: In this invention an optical fiber doped with a rare earth element and coupled to be pumped with a laser is coupled to an optical feedback loop. The feedback loop couples the output signal of the fiber amplifier to the input of the fiber amplifier. A narrow bandwidth filter coupled to the feedback loop allows a selected wavelength of the amplified spontaneous emission to pass from the output of the fiber amplifier to the input of the fiber amplifier. The feedback signal has a wavelength which is different from that of the pump signal and the wavelengths of the signals to be amplified. In operation, when bursts of optical signals from at least two discrete word or frequency division multiplexed channels are amplified in the fiber amplifier, the undesired fluctuations of gain of the output signals normally due to transient saturation of the erbium-doped filter amplifier are substantially eliminated.
    Type: Grant
    Filed: January 31, 1991
    Date of Patent: February 11, 1992
    Assignee: AT&T Bell Laboratories
    Inventor: Martin Zirngibl
  • Patent number: 5088098
    Abstract: A thermoelectric cooler temperature control circuit provides a periodic control signal having a substantially constant peak-to-peak magnitude and an average value dependent on a sensed temperature to be regulated. The control signal is coupled to control the heating or cooling of a thermoelectric cooler. In a preferred embodiment, complementary positive and negative going control signal pulse streams are provided. A switch selectively couples one of the complementary pulse streams to cool the thermolectric cooler or the other stream to heat the cooler. The control signal pulse streams can be pulse width modulated signals.
    Type: Grant
    Filed: October 16, 1990
    Date of Patent: February 11, 1992
    Assignee: General Instrument Corporation
    Inventors: Mathias Muller, Dean Stoneback
  • Patent number: 5085494
    Abstract: A fiber optic cable splice means for splicing a fiber optic cable having a pair of fiber retaining elements with an opening for receiving the buffer casing at an end of a fiber optic cable with its bare optic fiber extending therefrom. A cavity within each element provides a fiber deflection chamber for protecting therein the bare optic fiber. The retaining elements are crimped for securing therewith the buffer casing and its optic fiber. A housing or tubular unit has end sections which receive therein a respective one of the retaining elements, and are crimped for securing the retaining elements therewith. An optical fiber alignment means is contained within the unit for aligning and optically joining together the ends of the optic fibers which extend from the retaining elements. The retaining elements may have an insert through which the optic fiber extends for securing the fiber by the crimping of the retaining elements.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: February 4, 1992
    Assignee: Aurora Optics, Inc.
    Inventors: Laurence N. Wesson, Nellie L. Cabato
  • Patent number: 5084880
    Abstract: A room temperature laser system for producing a CW Laser emission at substantially 2.7 microns is disclosed. In a preferred embodiment, the laser system comprises a laser diode source for producing a CW pump beam at a preselected wavelength; and a fiber laser doped with erbium activator ions to produce an output CW laser emission at a wavelength in the range of 2.71-2.78 microns when the fiber laser is pumped by the CW pump beam.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: January 28, 1992
    Assignee: The United States of America as represented by the Sectretary of the Navy
    Inventors: Leon Esterowitz, Roger E. Allen
  • Patent number: 5084890
    Abstract: A 2.7Sg(m)m laser comprises a single mode fluoro-zirconate optical fibre doped with 0.086 mole % Er.sup.3+. C-W operation of the usually self-terminating lasing transition .sup.4 I.sub.11/2 to .sup.4 I.sub.13/2 is achieved by applying excitation energy to a suitable wavelength and intensity to elevate ions from the lower lasing level to maintain a population inversion between the upper and lower lasing levels during lasing. The laser may be pumped at a single wavelength of about 785 nm by a semiconductor laser.
    Type: Grant
    Filed: November 14, 1990
    Date of Patent: January 28, 1992
    Assignee: British Telecommunications public limited company
    Inventor: Michael C. Brierley
  • Patent number: 5084886
    Abstract: A laser construction having a laser medium mounted on a mounting structure, and one or more diode laser pumped sources each formed by a plurality of laser diodes arranged in arrays and mounted on a mounting structure adjacent to the side of the laser medium in position such that when they are stimulated to lase their output radiation energy will be directed at the laser medium, insulation between the mounting structures for the laser medium and the laser diodes, and separate coolers for the mounting structures for the medium and for the pump sources including electrical connections thereto for controlling the temperature of the respective coolers. The invention also resides in such a structure wherein the medium is formed of separate medium portions, and the pump source on are mounted on separate mounting structures and are positioned separately excite the separate medium portions so as to produce separate laser output radiations therefrom.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: January 28, 1992
    Assignee: Laser Diode, Inc.
    Inventor: Danny W. Martin
  • Patent number: 5081639
    Abstract: The present invention provides a diffraction limited, high numerical aperture (fast) cylindrical microlens. The method for making the microlens is adaptable to produce a cylindrical lens that has almost any shape on its optical surfaces. The cylindrical lens may have a shape, such as elliptical or hyperbolic, designed to transform some particular given input light distribution into some desired output light distribution. In the method, the desired shape is first formed in a glass preform. Then, the preform is heated to the minimum drawing temperature and a fiber is drawn from it. The cross-sectional shape of the fiber bears a direct relation to the shape of the preform from which it was drawn. During the drawing process, the surfaces become optically smooth due to fire polishing.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: January 14, 1992
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: James J. Snyder, Patrick Reichert
  • Patent number: 5077745
    Abstract: Part of a solid-state lasing medium is made to be a mode locking section. An ultrasonic transducer being supplied with a high-frequency voltage generates an ultrasonic wave to propagate through the mode locking section. As a result, laser light pulses having a repetition frequency determined by the frequency of the ultrasonic wave are output from a laser apparatus.
    Type: Grant
    Filed: April 6, 1990
    Date of Patent: December 31, 1991
    Assignee: Hamamatsu Photonics K. K.
    Inventors: Shinichiro Aoshima, Kenshi Fukumitsu
  • Patent number: 5077746
    Abstract: A monochromatic dye laser is constructed from a short cavity laser 61 with an external narrow bandwidth amplifier 62 designed to pass only a single mode. The frequency of the SCL is controlled by a servo fed from an interferometer which monitors the spacing of the laser mirrors, while the pass frequency of the NBA is controlled by a servo 68 fed by photodetectors 65,66 which monitor the amplitude of peripheral bands.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: December 31, 1991
    Assignee: National Research Development Corporation
    Inventor: Paul Ewart
  • Patent number: 5075893
    Abstract: Apparatus 10 (FIG.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: December 24, 1991
    Assignee: Battelle Memorial Institute
    Inventors: Harold M. Epstein, Jeffrey L. Dulaney
  • Patent number: 5075573
    Abstract: The invention relates to a low-noise amplification device of an optical wave. Signal wave (F.sub.s) to be amplified interferes with a pump wave (F.sub.p) in such a nonlinear medium (1) as a photorefractive crystal. To reduce the noise considerably, even to eliminate it, the establishing of noise-generating interferences therefore is prevented by moving, by rotation around an axis O, the nonlinear medium.
    Type: Grant
    Filed: May 16, 1990
    Date of Patent: December 24, 1991
    Assignee: Thomson-CSF
    Inventors: Jean-Pierre Huignard, Henri Rajbenbach
  • Patent number: 5072451
    Abstract: A molecular crystal comprising a molecule represented by formula (I) shown below: ##STR1## The crystal has high blue light transmittance and non-linear optical characteristics.
    Type: Grant
    Filed: January 18, 1991
    Date of Patent: December 10, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masaki Okazaki, Makoto Ishihara, Koji Matsuo
  • Patent number: 5072135
    Abstract: Disclosed is a laser pulse generator in which a single pulse is generated from a train of pulses. The amplitude of this single pulse is the addition of the amplitudes of the pulses of the train of pulses. This addition is done in a non-linear crystal inserted in an optical loop. The train of pulses takes the place of a pump wave applied to the non-linear crystal and the signal circulating in the optical loop takes the place of a signal wave. This signal wave therefore benefits from a transfer of energy coming from the pump wave because of the interaction in the non-linear crystal.
    Type: Grant
    Filed: July 6, 1990
    Date of Patent: December 10, 1991
    Assignee: Thomson-CSF
    Inventors: Jean-Pierre Huignard, Jean-Luc Ayral, Patrice Jano
  • Patent number: 5070505
    Abstract: A micro-laser is formed from a substantially thin etalon of a self-doubling crystal which has two opposite faces and which is positioned, relative to a close coupled and diode pumped source of optical radiation, for resonantly enhanced phase-matched harmonic generation along an axis of propagation which is substantially perpendicular to the two faces of the etalon.
    Type: Grant
    Filed: January 7, 1991
    Date of Patent: December 3, 1991
    Assignee: Amoco Corporation
    Inventor: George J. Dixon