Having An Applied Magnetic Field Patents (Class 372/37)
  • Patent number: 11394168
    Abstract: A master oscillator configured as a seed laser for a laser optical module includes a reduced size, temperature controlled non-planar ring oscillator, a piezo-electric transducer mounted on the non-planar ring oscillator, a pump laser diode, and coupling optics configured to couple a laser output of the pump laser diode to an end face of the non-planar ring oscillator. The pump laser diode may operate as a single-mode pump.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: July 19, 2022
    Assignee: United States of America as represented by the Administrator of NASA
    Inventors: Anthony Yu, Kenji Numata
  • Patent number: 11162530
    Abstract: A gas laser apparatus includes: a magnetic bearing including an electromagnet capable of controlling a magnetic force, and configured to rotatably support a rotary shaft of a fan in a magnetically levitated state by the magnetic force, the fan being configured to supply a laser gas; an electromagnet control unit configured to control the magnetic force of the electromagnet based on displacement of a levitated position of the rotary shaft and adjust the levitated position; a motor configured to generate torque for rotating the fan; a magnetic coupling configured to couple the rotary shaft and a drive shaft of a motor with a magnetic attractive force and transmit the torque of the motor to the rotary shaft; an attractive force estimating sensor configured to detect a parameter that enables an attractive force of the magnetic coupling to be estimated; an attractive force measuring unit configured to measure the attractive force of the magnetic coupling based on the detected parameter; and a correction unit confi
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: November 2, 2021
    Assignee: Gigaphoton Inc.
    Inventors: Masaharu Miki, Osamu Wakabayashi
  • Patent number: 10734980
    Abstract: A system, method, and apparatus for pulsed charging applications comprises a bulk capacitor operably connected to a power source, an inductor connected to the bulk capacitor with a charge switch, a pulse capacitor connected to the inductor, a freewheeling diode connecting a point between the charge switch and the inductor to a point after the pulse capacitor, a second diode connecting the inductor to the pulse capacitor, and a pulse switch connecting the pulse capacitor to a load.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: August 4, 2020
    Assignee: FERMI RESEARCH ALLIANCE, LLC
    Inventors: Chris Jensen, Howard Pfeffer, Kenneth Quinn, Matthew Kufer
  • Patent number: 10322204
    Abstract: Provided herein is an ultraviolet sterilization and disinfection apparatus. One or multiple low-pressure ultraviolet lamps are arranged within the ultraviolet sterilization and disinfection apparatus. A configuration method therefor is such that the inner diameters of the low-pressure ultraviolet lamps are ?30-36 mm and the tube current density is: 0.250-0.800 A/cm2; alternatively the inner diameters are ?26-30 mm and the tube current density is: 0.280-0.850 A/cm2; alternatively, the inner diameters are ?20-26 mm and the tube current density is: 0.300-1.100 A/cm2; alternatively, the inner diameters are ?15-20 mm and the tube current density is: 0.340-1.350 A/cm2. The method allows the ultraviolet dosage of the ultraviolet sterilization and disinfection apparatus to be increased, thus increasing efficiency in sterilization and disinfection.
    Type: Grant
    Filed: February 13, 2014
    Date of Patent: June 18, 2019
    Inventor: Zhiming He
  • Patent number: 10141711
    Abstract: Laser amplification utilizing plasma confinement of a gas laser gain media is described. The gas laser gain media is compressed into plasma utilizing a self-reinforcing magnetic field referred to a plasma pinch (e.g., a flow stabilized z-pinch). In the pinch, the gas laser gain media is compressed to a high density, which improves the gain of the media. Coherent light is transmitted through the plasma pinch, which is amplified by the plasma pinch.
    Type: Grant
    Filed: April 7, 2016
    Date of Patent: November 27, 2018
    Assignee: The Boeing Company
    Inventors: Mark Joseph Clemen, Jr., James A. Grossnickle, Dejan Nikic
  • Patent number: 9915833
    Abstract: A Faraday rotator mirror, including: a polarizing beam splitter, a polarizing beam converging device made from birefringent crystal, a Faraday rotator, a reflecting mirror. In operation, light rays from an optical coupling element pass through the polarizing beam splitter, the polarizing beam converging device, the Faraday rotator, and the reflecting mirror, in that order, and then return back through the Faraday rotator, the polarizing beam converging device, and the polarizing beam splitter, in that order, and are output from the optical coupling element in reverse to the original incidence path.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: March 13, 2018
    Assignee: Opsmith Technologies Co., Ltd.
    Inventor: Sisi Chen
  • Patent number: 9705288
    Abstract: A vertical external cavity surface emitting laser (VECSEL) structure includes a heterostructure and first and second reflectors. The heterostructure comprises an active region having one or more quantum well structures configured to emit radiation at a wavelength, ?lase, in response to pumping by an electron beam. One or more layers of the heterostructure may be doped. The active region is disposed between the first reflector and the second reflector and is spaced apart from the first reflector by an external cavity. An electron beam source is configured to generate the electron beam directed toward the active region. At least one electrical contact is electrically coupled to the heterostructure and is configured to provide a current path between the heterostructure and ground.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: July 11, 2017
    Assignee: Palo Alto Research Center Incorporated
    Inventors: Thomas Wunderer, Noble M. Johnson, John E. Northrup
  • Patent number: 9653869
    Abstract: Techniques and architecture are disclosed for preserving optical surfaces (e.g., windows, coatings, etc.) in a flowing gas amplifier laser system, such as a diode-pumped alkali laser (DPAL) system. In some instances, the disclosed techniques/architecture can be used, for example, to protect optical surfaces in a DPAL system from: (1) chemical attack by pump-bleached alkali vapor atoms and/or ions; and/or (2) fouling by adherence thereto of reaction products/soot produced in the DPAL. Also, in some instances, the disclosed techniques/architecture can be used to substantially match the geometry of the pumping volume with that of the lasing volume, thereby minimizing or otherwise reducing the effects of amplified spontaneous emission (ASE) on DPAL output power. Furthermore, in some cases, the disclosed techniques/architecture can be used to provide a DPAL system capable of producing a beam output power in the range of about 20 kW to 10 MW, or greater.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: May 16, 2017
    Assignee: University of New Hampshire
    Inventors: F. William Hersman, David W. Watt
  • Patent number: 9351800
    Abstract: A hybrid tracking system utilizing at least one combined light emitting diode (LED) and magnetoresistance sensor. The hybrid tracking system includes optical tracking technology and electromagnetic (EM) tracking technology with at least one combined LED and magnetoresistance reference sensor attached to a fixed object, at least one combined LED and magnetoresistance sensor attached to an object being tracked, and a processor coupled to the at least one combined LED and magnetoresistance reference sensor and the at least one combined LED and magnetoresistance sensor for processing signals from the at least one combined LED and magnetoresistance reference sensor and the at least one combined LED and magnetoresistance sensor. The combined LED and magnetoresistance sensor includes at least one magnetoresistance sensor and at least one LED that are integrated into a single package.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: May 31, 2016
    Assignee: General Electric Company
    Inventors: Daniel Eduardo Groszmann, William Hullinger Huber, Jon Thomas Lea, Laurent Jacques Node-Langlois, Christopher Allen Nafis
  • Patent number: 9059554
    Abstract: A discharge-pumped gas laser device may include a laser chamber, a pair of discharge electrodes provided in the laser chamber, a fan with a magnetic bearing being provided in the laser chamber and configured to be capable of circulating a gas in the laser chamber, a housing configured to contain the laser chamber, and a magnetic bearing controller connected to the magnetic bearing electrically, being capable of controlling the magnetic bearing, and provided in the housing separately from the laser chamber.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: June 16, 2015
    Assignee: GIGAPHOTON INC.
    Inventors: Akihiko Kurosu, Junichi Fujimoto, Yosuke Ishizuka, Takashi Matsunaga, Osamu Wakabayashi
  • Patent number: 8947769
    Abstract: An apparatus for tunable generation of terahertz photons is provided. The apparatus comprises a three level magnon laser, an injection means, a terahertz antenna, and a tuning means. The terahertz antenna further comprises a magnon gain medium that supports generation of nonequilibrium magnons. The magnon gain medium is selected from the group consisting of: a ferromagnetic semiconductor; a dilute magnetic semiconductor (DMS); a half-metallic ferromagnet (HMF); and a ferromagnetic conductor, with a gap in the density of states of the minority electrons around the Fermi energy.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: February 3, 2015
    Assignee: Terahertz Technologies LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Patent number: 8593724
    Abstract: A four level magnon laser comprising: a Magnon Gain Medium, wherein the Magnon Gain Medium supports generation of nonequilibrium magnons, and a means for pumping nonequilibrium electrons into Magnon Gain Medium. Propagation of nonequilibrium electrons in Magnon Gain Medium causes generation of nonequilibrium magnons. Magnon Gain Medium comprises ferromagnetic materials at room temperatures including the half-metallic ferromagnets.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: November 26, 2013
    Assignee: Terahertz Technologies LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Patent number: 8587788
    Abstract: A laser gyro for measuring the angular velocity or the angular position relative to a defined rotation axis includes: an optical ring cavity; a solid-state amplifying medium; and a non-reciprocal magneto-optic device; which are arranged so that four linearly polarized propagation modes can propagate within the cavity, the magneto-optic device introducing a frequency bias between the modes propagating in a first direction and the modes propagating in the opposite direction. In the device, the cavity also includes a stabilizer device for stabilizing the intensity of the four propagation modes at substantially equivalent levels, said device comprising at least one optical element made of a non-linear crystal of the frequency-doubling type.
    Type: Grant
    Filed: May 6, 2011
    Date of Patent: November 19, 2013
    Assignee: Thales
    Inventors: Sylvain Schwartz, Gilles Feugnet, Jean-Paul Pocholle
  • Patent number: 8503494
    Abstract: Various embodiments are disclosed for a thermal management system and related method for selectively thermally isolating and thermally connecting a target component. One embodiment of a system includes a first component having a first surface proximate to a target component, and an electromagnet between the first surface and the target component. A second component is spaced apart from the first component to form a gap that serves as a thermal boundary between the first component and the second component. A carrier fluid disposed within the gap includes multiple thermally conductive, ferrous particles. The carrier fluid is configured to align at least a portion of the thermally conductive, ferrous particles when the electromagnet generates a magnetic field that attracts the particles, and to displace at least a portion of the particles when the electromagnet generates a magnetic field that repels the particles.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: August 6, 2013
    Assignee: Microsoft Corporation
    Inventor: Dawson Yee
  • Patent number: 8427740
    Abstract: An apparatus and method for generating modulated terahertz radiation are provided. The apparatus comprises: (A) a means for generating Terahertz radiation by pumping nonequilibrium electrons into Magnon Gain Medium (MGM); wherein the nonequilibrium electrons emit nonequilibrium magnons, and wherein interaction between nonequilibrium magnons in the Magnon Gain Medium (MGM) causes generation of Terahertz radiation; and (B) a means for modulating the generated Terahertz radiation. The Magnon Gain Medium (MGM) is selected from a magnetic material that supports generation of non-equilibrium magnons at room temperatures. The modulating means further comprises: an AC magnetic field generator, or an AC electric field generator.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: April 23, 2013
    Assignee: Terahertz Technologies LLC
    Inventor: Boris G. Tankhilevich
  • Patent number: 8422529
    Abstract: A tunable laser light source having emission wavelengths in a visible or an adjoining spectral region includes a rotationally disposed laser substrate having more than one emission wavelength, a drive unit coupled to the laser substrate, a pulsed light source having a pulse transmitter, a trigger device, and a signal-delay unit. The trigger device, the signal-delay unit and the pulse transmitter are sequentially connected downstream of the drive unit.
    Type: Grant
    Filed: August 19, 2010
    Date of Patent: April 16, 2013
    Assignee: Karlsruher Institut Fuer Technologie
    Inventors: Thomas Woggon, Soenke Klinkhammer, Sebastian Valouch, Johannes Bach, Uli Lemmer
  • Patent number: 8031397
    Abstract: A magnon laser comprising: a Magnon Gain Medium, wherein the Magnon Gain Medium supports generation of nonequilibrium magnons, and a means for pumping nonequilibrium electrons into the Magnon Gain Medium. Propagation of nonequilibrium electrons in Magnon Gain Medium causes generation of nonequilibrium magnons. Magnon Gain Medium comprises ferromagnetic materials at room temperatures including the half-metallic ferromagnets.
    Type: Grant
    Filed: November 1, 2008
    Date of Patent: October 4, 2011
    Assignee: Terahertz Technologies, LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Patent number: 7986454
    Abstract: An apparatus and method for tunable generation of terahertz waves at room temperatures are provided. The apparatus for tunable terahertz generation comprises: (A) a terahertz antenna further comprising a magnon gain medium; (B) a means for generating the nonequilibrium magnons in the magnon gain medium; wherein the terahertz antenna is configured to emit generated terahertz photons; and (C) a means for tuning frequency of terahertz photons emitted by the terahertz antenna. The magnon gain medium is selected from the group consisting of: {a ferromagnetic semiconductor; a dilute magnetic semiconductor (DMS); a half-metallic ferromagnet (HMF); and a ferromagnetic conductor, with a gap in the density of states of the minority electrons around the Fermi energy}.
    Type: Grant
    Filed: December 2, 2008
    Date of Patent: July 26, 2011
    Assignee: Terahertz Technologies LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Patent number: 7982946
    Abstract: An apparatus and method for generating modulated terahertz radiation are provided. The apparatus comprises: (A) a means for generating Terahertz radiation by pumping nonequilibrium electrons into Magnon Gain Medium (MGM); wherein the nonequilibrium electrons emit nonequilibrium magnons, and wherein interaction between nonequilibrium magnons in the Magnon Gain Medium (MGM) causes generation of Terahertz radiation; and (B) a means for modulating the generated Terahertz radiation. The modulating means further comprises: an AC magnetic field generator, or an AC electric field generator.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: July 19, 2011
    Assignee: Terahertz Technologies LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Patent number: 7929586
    Abstract: An electromagnetic pumped alkali metal vapor cell system is provided. The system comprises a vapor cell and windings. The vapor cell contains alkali metal and a buffer. The windings are positioned around the vapor cell and are configured to create an electromagnet field in the vapor cell when an AC signal is applied to the windings. The electromagnetic field pumps unexcited alkali vapor into unionized D1 and D2 states.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: April 19, 2011
    Assignee: Alliant Techsystems Inc.
    Inventor: John S. Canham
  • Patent number: 7889767
    Abstract: An optical arrangement comprising first and second guided structures for providing first and second beams of electromagnetic energy and a node for coherently combining said first and second beams in free space, that is, with an unguided structure. In the illustrative embodiment, the first and second structures are first and second fiber oscillators. The first and second fiber oscillators may be of unequal lengths. The node may be implemented with a polarizing beam splitter or a semi-reflective surface. Beam shaping optics are included in the node to collimate the first and second beams and provide a flat profile mode thereof. The outputs of plural first and second fiber oscillators are combined via plural nodes to provide a single high energy output beam. Amplifying elements may be disposed between nodes. The plural nodes may be disposed in a single integrated structure along with an outcoupler mirror to coherently phase lock the outputs of the plural oscillators.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: February 15, 2011
    Assignee: Raytheon Company
    Inventors: Alexander A. Betin, Kalin Spariosu
  • Patent number: 7872555
    Abstract: An undulator comprises a first magnetic circuit (11) for forming a periodic magnetic field, a first support body (21) for supporting the first magnetic circuit (11), a second magnetic circuit (12) arranged opposite to the first magnetic circuit (11), for forming a periodic magnetic field, a second support body (22) for supporting the second magnetic circuit (12), a space (13) formed between the oppositely arranged first magnetic circuit (11) and the second magnetic circuit (12), for passing an electron beam, a vacuum chamber (1) for vacuum-sealing the first magnetic circuit (11) and the second magnetic circuit (12), and a refrigerant passing tube (30) for cooling a permanent magnet (m) constituting the first magnetic circuit (11) and the second magnetic circuit (12) below the room temperature.
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: January 18, 2011
    Assignees: Hitachi Metals, Ltd., Riken
    Inventors: Hideo Kitamura, Toru Hara, Takashi Tanaka, Tsutomu Kohda, Yutaka Matsuura
  • Patent number: 7706056
    Abstract: A method of modulation terahertz radiation comprising: (A) generating Terahertz radiation by pumping nonequilibrium electrons into a Magnon Gain Medium (MGM), wherein propagation of nonequilibrium electrons in the MGM causes generation of nonequilibrium magnons, and wherein interaction between the nonequilibrium magnons causes generation of the Terahertz radiation; and (B) frequency modulating THz radiation generated in the MGM by applying longitudinal AC magnetic field, or by applying AC electrical field bias.
    Type: Grant
    Filed: August 9, 2007
    Date of Patent: April 27, 2010
    Assignee: Terahertz Technologies LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Patent number: 7581403
    Abstract: Energy is stored in the compression of a metastable degenerate Fermi electron gas contained in a compressed metallic base material subjected to a magnetic field in a high pressure cell. Heat energy is introduced to increase the energy of the compressed metastable degenerate Fermi electron gas. The increase in energy causes the magnetic field to increase so that the metastable degenerate Fermi electron gas is further compressed. Absorption of heat results in a decrease in the temperature. Energy can be withdrawn from The system by allowing the metastable degenerate Fermi electron gas to expand against the compressing magnetic field. To prevent development of fissures, the metallic base material is precompressed to provide an allowance for the volume of a metastable Fermi electron gas bubble to be created later.
    Type: Grant
    Filed: April 15, 2005
    Date of Patent: September 1, 2009
    Inventor: Daniel H. Deeks
  • Patent number: 7551657
    Abstract: A Magneto-Optoelectronic Device MOD (10) includes a magnetic sensing device (12), such as a magnetoresistive device or a magnetic tunnel junction device, that is combined with a semiconductor light emitter (14), such as a LED or a laser diode, to create a compact integrated device where changes in an ambient magnetic field are expressed as changes in an optical beam intensity emanating from the MOD. Using the MOD (10) the magnetic field related information can be transmitted by a light wave over very large distances through some medium (34), for example, through free space and/or through an optical fiber.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: June 23, 2009
    Assignee: Brown University
    Inventor: Arto V Nurmikko
  • Patent number: 7508578
    Abstract: A magnon laser comprising: a magnon gain medium (MGM) that supports generation of nonequilibrium magnons, and a means for generating nonequilibrium magnons in the MGM further comprising a means for pumping nonequilibrium electrons into the MGM. Propagation of nonequilibrium electrons in the MGM causes generation of nonequilibrium magnons. The MGM is selected from the group consisting of: {ferromagnetic semiconductor; ferromagnetic insulator; and ferromagnetic material}. The merging of nonequilibrium magnons causes generation of terahertz waves.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: March 24, 2009
    Assignee: Terahertz Technologies, LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Publication number: 20090067461
    Abstract: The transmitter has a generally flat, circuit board stator, a rotor including a plurality of magnets mounted in a ring around a central opening, and a bearing, supporting the rotor for rotation about an axis that extends through the central opening, A pentaprism assembly including an optics holder is mounted on the rotor for rotation therewith. The pentaprism assembly receives a beam of laser light through the central opening and redirects at least a portion of the laser light outward in a direction normal to the rotation axis. A laser source, mounted on the stator, provides a beam of laser light through the central opening to the pentaprism assembly. The beam of laser light is aligned with the rotation axis. The laser source includes a collimating lens positioned within the rotor. A shield plate of magnetic material beneath the stator exerts a force on the rotor in conjunction with the magnets, taking play out of the bearing.
    Type: Application
    Filed: September 10, 2007
    Publication date: March 12, 2009
    Applicant: TRIMBLE NAVIGATION LIMITED
    Inventors: Ayman Hajmousa, Michael F. Glantz, James N. Hayes
  • Publication number: 20090052484
    Abstract: A Magneto-Optoelectronic Device MOD (10) includes a magnetic sensing device (12), such as a magnetoresistive device or a magnetic tunnel junction device, that is combined with a semiconductor light emitter (14), such as a LED or a laser diode, to create a compact integrated device where changes in an ambient magnetic field are expressed as changes in an optical beam intensity emanating from the MOD. Using the MOD (10) the magnetic field related information can be transmitted by a light wave over very large distances through some medium (34), for example, through free space and/or through an optical fiber.
    Type: Application
    Filed: October 16, 2008
    Publication date: February 26, 2009
    Inventor: Arto V. Nurmikko
  • Publication number: 20090005631
    Abstract: There is provided a photo-magnetic radiation device, including a radiation emitting head having a low level laser light source for emitting light through a lightguide, a magnet producing a magnetic field in the vicinity of the emitting head, a visible light emitter and one infrared light source located inside the emitting head, to emit visible and infrared lights together with the laser light and magnetic field. The device further includes a power source and a controller for selectively activating lights in the emitting head.
    Type: Application
    Filed: January 4, 2008
    Publication date: January 1, 2009
    Inventors: Zidkiyahu Simenhaus, Spiridon F. Apostolou, Tamara Kaplunsky, Pablo Sheinman, Liora Gertzman
  • Patent number: 7471449
    Abstract: An apparatus for generation of Terahertz radiation comprising: (A) a Magnon Gain Medium (MGM), wherein the MGM supports generation of nonequilibrium magnons; and (B) at least one magnon mirror (MM). The nonequilibrium magnons are generated in the MGM. Interaction between nonequilibrium magnons leads to generation of Terahertz photons.
    Type: Grant
    Filed: May 2, 2007
    Date of Patent: December 30, 2008
    Assignee: Terahertz Technologies LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Patent number: 7460577
    Abstract: An RF excited gas laser including an offset V-shaped laser cavity. The laser includes a first and second ceramic body portions with the laser cavity at least partially defined by the ceramic body portions. At least one internal gas reservoir is also at least partially defined by the first and second body portions, with the internal gas reservoir being in gas communication with laser cavity by way of at least one gas communication slot. The RF laser further includes at least two electrode slots formed in the exterior of the ceramic body portions and an electrode at least partially received in the electrode slots.
    Type: Grant
    Filed: January 3, 2006
    Date of Patent: December 2, 2008
    Assignee: Iradion Laser, Inc.
    Inventor: Clifford Morrow
  • Patent number: 7440178
    Abstract: A method of tunable generation of terahertz radiation comprising: (A) providing a magnon gain medium; wherein the magnon gain medium supports generation of nonequilibrium magnons; (B) generating terahertz radiation in the magnon gain medium; and (C) tuning frequency of the terahertz radiation by causing changes in an external parameter. The substantial tuning of the frequency of the generated terahertz radiation can be achieved by applying an external magnetic field, and by causing changes in a value of the external magnetic field.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: October 21, 2008
    Assignee: Terahertz Technologies, LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Patent number: 7440479
    Abstract: A Magneto-Optoelectronic Device MOD (10) includes a magnetic sensing device (12), such as a magnetoresistive device or a magnetic tunnel junction device, that is combined with a semiconductor light emitter (14), such as a LED or a laser diode, to create a compact integrated device where changes in an ambient magnetic field are expressed as changes in an optical beam intensity emanating from the MOD. Using the MOD (10) the magnetic field related information can be transmitted by a light wave over very large distances through some medium (34), for example, through free space and/or through an optical fiber.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: October 21, 2008
    Assignee: Brown University
    Inventor: Arto V Nurmikko
  • Patent number: 7430074
    Abstract: A method of THz photon generation comprising: providing a magnon gain medium; wherein the magnon gain medium supports generation of nonequilibrium magnons; and injecting nonequilibrium electrons into the magnon gain medium. Propagation of nonequilibrium electrons in the magnon gain medium causes generation of nonequilibrium magnons. Interaction between nonequilibrium magnons causes generation of THz photons.
    Type: Grant
    Filed: July 3, 2006
    Date of Patent: September 30, 2008
    Assignee: Terahertz Technologies, LLC
    Inventors: Yehiel Korenblit, Boris G. Tankhilevich
  • Publication number: 20080053833
    Abstract: A method and system of energy storage in which energy is stored in the compression of a metastable degenerate Fermi electron gas contained in a compressed metallic base material such as lithium in a high pressure cell which is subjected to a magnetic field to further compress the metastable degenerate Fermi electron gas. In operation, heat energy is introduced to increase the energy of the compressed metastable degenerate Fermi electron gas which causes the magnetic field associated therewith to increase to further compress the metastable degenerate Fermi electron gas, which causes the heat to be absorbed and results in a decrease in the temperature thereof. Energy can be withdrawn from the system by allowing the metastable degenerate Fermi electron gas to expand against the compressing magnetic field. The lithium is precompressed prior to cryogenic cooling thereof.
    Type: Application
    Filed: April 15, 2005
    Publication date: March 6, 2008
    Inventor: Daniel H. Deeks
  • Patent number: 7230959
    Abstract: Laser apparatus and methods that permit actuation of a tuning element via a magnetically coupled drive assembly, and which provide for isolation of contamination-sensitive optical surfaces within a hermetically sealed enclosure with a magnetically coupled drive assembly that is external to the enclosure. The apparatus of the invention comprises a tuning element positioned in a light beam, and a drive element magnetically coupled to the tuning element. The apparatus may further comprise a hermetically sealed enclosure, with the tuning element positioned within the hermetically sealed enclosure, and the drive element located outside the hermetically sealed enclosure. The methods comprise positioning a tuning element in a light beam, magnetically coupling a drive element to the tuning element; and actuating the tuning element via magnetic coupling between the tuning element and the drive element. The methods may further comprise enclosing the tuning element in a hermetically sealed container.
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: June 12, 2007
    Assignee: Intel Corporation
    Inventor: Brad V. Johnson
  • Patent number: 7154925
    Abstract: A gas laser oscillator of easy maintenance which is capable of switching a beam mode at high speed. Electric discharge sections in which gas medium is flown are formed in an optical resonating space in an electric discharge tube between a rear mirror and an output mirror. Electrodes are connected to electric discharge power sources (alternating current or direct current power sources). Coils are wound around the electric discharge tube at the respective electric discharge sections and excited by coil excitation circuits. Directions and intensities of the excitation currents from the coil excitation circuits are controlled by a controller. Regions in which the electric discharge currents flow between the electrodes in the respective electric discharge sections are varied by magnetic fields generated by the coils in accordance with the directions and intensities of the excitation currents of the coils, to thereby control the beam mode.
    Type: Grant
    Filed: January 29, 2004
    Date of Patent: December 26, 2006
    Assignee: Fanuc Ltd
    Inventors: Akira Egawa, Minoru Ando
  • Patent number: 7129807
    Abstract: In an undulator for the generation of synchrotron radiation from a particle beam introduced into the undulator, two partial undulators are provided each comprising a conductor of superconductive material which, when a current is conducted therethrough, generates an undulator field that extends perpendicularly to the current flow, and the superconductive conductors are arranged in the individual partial undulators such that the undulator fields generated are not parallel, whereby, by controlling the energization of the two partial undulators, the polarization direction of the synchrotron radiation can be adjusted without mechanical movements.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: October 31, 2006
    Assignee: Forschungszentrum Karlsruhe GmbH
    Inventors: Robert Rossmanith, Uwe Schindler
  • Patent number: 6999487
    Abstract: A process including: magnetically energizing susceptible magnetic particles; and accumulating the resulting terahertz lasing mode output of the particles.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: February 14, 2006
    Assignee: Xerox Corporation
    Inventor: Ronald F. Ziolo
  • Patent number: 6990126
    Abstract: Superradiance is generated by generating coherent radiation in the 10 gigahertz (1010) to terahertz (1012) regions of the electromagnetic spectrum. The radiation is produced by pulsing a micro crystal of a molecular magnet in a cavity or between a pair of superconductor mirrors at Kelvin or milli-Kelvin temperatures. The coherence and source of the radiation result from enhanced quantum mechanical spin tunneling. Alternatively, the radiation may be obtained by moving the crystal in and out of the field of a permanent magnet.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: January 24, 2006
    Assignee: Xerox Corporation
    Inventors: Javier Tejada, Joan M. Hernandez, Roger Amigo, Ronald F. Ziolo
  • Patent number: 6912238
    Abstract: A laser and method of producing laser light. The laser and method involve passing a high energy beam of particles through an evacuated chamber. A static electric or magnetic field is established in the chamber in a direction that is essentially perpendicular to the direction of propagation of the beam, but which is a periodically varying field in the direction of propagation. The velocity of the particles and the variation in the field is sufficient to pump the particles into a higher energy state and produce laser light at the output of the chamber.
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: June 28, 2005
    Inventor: Robert James Howard
  • Patent number: 6813301
    Abstract: First and second radial magnetic bearings are provided at opposing ends of a rotary shaft, first and second protective bearings are arranged in the vicinity thereof, a third radial magnetic bearing is arranged on a side of a fan near a motor, and by the third radial magnetic bearing, negative spring element of the motor is corrected.
    Type: Grant
    Filed: September 19, 2001
    Date of Patent: November 2, 2004
    Assignee: NTN Corporation
    Inventors: Takayoshi Ozaki, Yuuji Yada, Hironori Tokunaga, Koji Yamada
  • Publication number: 20040202221
    Abstract: A laser and method of producing laser light. The laser and method involve passing a high energy beam of particles through an evacuated chamber. A static electric or magnetic field is established in the chamber in a direction that is essentially perpendicular to the direction of propagation of the beam, but which is a periodically varying field in the direction of propagation. The velocity of the particles and the variation in the field is sufficient to pump the particles into a higher energy state and produce laser light at the output of the chamber.
    Type: Application
    Filed: April 10, 2003
    Publication date: October 14, 2004
    Inventor: Robert James Howard
  • Patent number: 6801555
    Abstract: An optical signal power monitoring and control system is described. The system comprises at least one lasing SOA that receives, amplifies, and outputs the optical signal. During the signal amplification, a ballast laser signal is output through a substrate of the lasing SOA. This ballast laser signal is indicative of the output power of the lasing SOA. At least one detector converts the ballast laser signal to an electrical signal and transmits this electrical signal to a power monitor circuit. Using the electrical signal, the power monitor determines the output power of the lasing SOA. A pump control adjusts the rate at which the lasing SOA is pumped in order to change the saturation level of the lasing SOA and its corresponding power output ceiling. According to one embodiment, the power monitor identifies when the lasing SOA is approaching saturation or is saturated.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: October 5, 2004
    Assignee: Finisar Corporation
    Inventors: Sol P. DiJaili, Jeffrey D. Walker
  • Patent number: 6801554
    Abstract: An excimer laser gas in a laser tube 2 is excited by a microwave introduced from awaveguide 1, and electric field concentration occurs in a slit-shaped gap 3 provided in a plate member 11c, causing plasma discharge. Then the phase of plasma light is regulated and the light is resonated, to cause excimer laser light. This construction realizes plasma excitation entirely uniform along a lengthwise direction of laser light emission, and enables uniform laser light emission with minimum energy loss.
    Type: Grant
    Filed: March 21, 2000
    Date of Patent: October 5, 2004
    Assignees: Canon Kabushiki Kaisha
    Inventors: Tadahiro Ohmi, Nobumasa Suzuki, Hiroshi Ohsawa, Nobuyoshi Tanaka, Toshikuni Shinohara, Masaki Hirayama
  • Patent number: 6795462
    Abstract: The invention describes a gas laser comprising a container (6) intended to receive a gas or a gas mixture as laser-active medium, the container (6) having an axis (14) along which the gas laser emits its laser radiation, and comprising further means for generating a plasma in the container (6) and means for generating a magnetic field in the container (6). It is provided according to the invention that a group of at least two pairs of magnet poles is arranged, with the poles (1, 2) extending at a distance from, and along the axis (14) and being arranged around the axis (14) with alternating polarity so that the magnetic field emanating from them exhibits an intensity sink in the region of the axis (14), and that the means for generating the plasma include a source for an electromagnetic alternating field, which is associated to the container (6).
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: September 21, 2004
    Inventors: Jens Christiansen, Kai Christiansen, Joachim Jacoby, Silke Christiansen
  • Patent number: 6690702
    Abstract: In an excimer laser oscillation apparatus including a laser chamber (20) constituted by a laser tube (2) for storing a laser gas containing a gas mixture of at least one inert gas selected from the group consisting of Kr, Ar, and Ne, He and F2 gas, and an optical resonator consisting of a pair of reflection mirrors (5, 6) arranged to sandwich the laser chamber (20) therebetween, the inner surface of the laser chamber (20) for storing the laser gas has a reflection-free surface with respect to light of a desired wavelength of 248 nm, 193 nm, or 157 nm, and the uppermost surface of the inner surface consists of a fluoride, and a means (waveguide 1) for introducing a microwave for exciting the laser gas in the laser chamber (20) is prepared.
    Type: Grant
    Filed: March 17, 2000
    Date of Patent: February 10, 2004
    Assignees: Canon Kabushiki Kaisha
    Inventors: Tadahiro Ohmi, Nobuyoshi Tanaka, Masaki Hirayama
  • Patent number: 6594292
    Abstract: A saturable reactor is in a conductive state or has a magnetic switching function depending on the direction of the current flowing through it. Also provided is a power source apparatus for pulse laser utilizing the satiable reactor.
    Type: Grant
    Filed: July 13, 1999
    Date of Patent: July 15, 2003
    Assignee: Komatsu Ltd.
    Inventors: Yasufumi Kawasuji, Masao Hagiwara, Yasuhiko Matsuki, Yoshio Nomura
  • Patent number: 6580733
    Abstract: Analog pulse position modulation of pulsed emission from a laser, which is actively and harmonically mode-locked. The laser requires: a body of an active gain medium; means for changing the gain as a function of a controllable parameter; harmonically and actively mode-locking the laser by fast periodic changes of said parameter; and superimposing slower changes on the parameter whereby the fast periodic parameter changes can be continuously shifted between the peak and the shoulder of the gain-vs-parameter curve. As proof of concept, electric control of the separation between two interleaved pulse trains from a far-infrared (1.5-4 THz) p-Ge laser, which is actively mode-locked by rf gain modulation at the second harmonic of the roundtrip frequency, is demonstrated by changing the electric bias at the rf contacts. A suggested application is telemetry using analog pulse position modulation.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: June 17, 2003
    Assignee: University of Central Florida
    Inventors: Robert E. Peale, Andrei V. Muravjov, Remco C. Strijbos, Chris J. Fredricksen, Sandra H. Withers
  • Patent number: RE40184
    Abstract: A method and surgical technique for corneal reshaping and for presbyopia correction are provided. The preferred embodiments of the system consists of a scanner, a beam spot controller and coupling fibers and the basic laser having a wavelength of (190-310) nm, (0.5-3.2) microns and (5.6-6.2) microns and a pulse duration of about (10-150) nanoseconds, (10-500) microseconds and true continuous wave. New mid-infrared gas lasers are provided for the corneal reshaping procedures. Presbyopia is treated by a method which uses ablative laser to ablate the sclera tissue and increase the accommodation of the ciliary body. The tissue bleeding is prevented by a dual-beam system having ablative and coagulation lasers. The preferred embodiments include short pulse ablative lasers (pulse duration less than 200 microseconds) with wavelength range of (0.15-3.2) microns and the long pulse (longer than 200 microseconds) coagulative lasers at (0.5-10.6) microns.
    Type: Grant
    Filed: July 10, 2003
    Date of Patent: March 25, 2008
    Assignee: SurgiLight, Inc.
    Inventor: Jui-Teng Lin