Molecular Or Particle Resonant Type (e.g., Maser) Patents (Class 331/94.1)
  • Patent number: 9768791
    Abstract: An atomic oscillator includes a gas cell into which alkali metal atoms are sealed, a light emitting portion that emits excitation light including a pair of resonance light beams for resonating the alkali metal atoms toward the alkali metal atoms, a coil that is provided to surround an outer circumference of the gas cell with an axis of the excitation light as an axial direction, and a shield case that stores at least the gas cell and the coil and contains a metal material, in which the shield case is constituted by a plurality of tabular portions, and, among the plurality of tabular portions, a main surface of one of two adjacent tabular portions faces a side surface of the other tabular portion.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: September 19, 2017
    Assignee: Seiko Epson Corporation
    Inventor: Koji Chindo
  • Patent number: 9766593
    Abstract: An atomic clock including an ion trap assembly, a C-field coil positioned for generating a first magnetic field in the interrogation region of the ion trap assembly, a compensation coil positioned for generating a second magnetic field in the interrogation region, wherein the combination of the first and second magnetic fields produces an ion number-dependent second order Zeeman shift (Zeeman shift) in the resonance frequency that is opposite in sign to an ion number-dependent second order Doppler shift (Doppler shift) in the resonance frequency, the C-field coil has a radius selected using data indicating how changes in the radius affect an ion-number-dependent shift in the resonance frequency, such that a difference in magnitude between the Doppler shift and the Zeeman shift is controlled or reduced, and the resonance frequency, including the adjustment by the Zeeman shift, is used to obtain the frequency standard.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: September 19, 2017
    Assignee: California Institute of Technology
    Inventors: Eric A. Burt, Robert L. Hamell, Blake C. Tucker, Kameron Larsen, Robert L. Tjoelker
  • Patent number: 9705517
    Abstract: A quantum interference device includes: a gas cell in which metal atoms are sealed; a light emitting unit which emits light to the gas cell; a light receiving unit which receives the light penetrating the gas cell and outputs a light receiving signal; an input unit which inputs the light receiving signal; a light receiving circuit which processes the light receiving signal output from the input unit; a high frequency current generation unit which is arranged with the light emitting unit in a line, and generates high frequency current; and a first output unit which outputs the high frequency current output from the high frequency current generation unit to the light emitting unit, in which the gas cell is disposed between the input unit and the first output unit.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: July 11, 2017
    Assignee: Seiko Epson Corporation
    Inventor: Noriaki Tanaka
  • Patent number: 9692432
    Abstract: A gas cell includes an internal space in which metal atoms and a buffer gas are sealed. The buffer gas includes a gas mixture including nitrogen gas and argon gas. The mole fraction of the argon gas in the gas mixture is equal to or greater than 15% and equal to or less than 40%.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: June 27, 2017
    Assignee: Seiko Epson Corporation
    Inventors: Hiroyuki Yoshida, Tomohiro Tamura
  • Patent number: 9639062
    Abstract: Vapor cells and methods for making the same are presented, in which a cell cavity is completely filled with aqueous alkali metal azide solution and the solution is dried at a controlled evaporation rate to substantially maintain edge contact pinning at an interface with the cavity sidewall to promote preferential evaporation in the center and outward capillary flow from an unpinned air-fluid interface toward the sidewall to form crystallized alkali metal material at the sidewall while inhibiting drying of dispersed aqueous solution on a transparent cavity bottom to provide substantially unrestricted passage of light through the cavity for atomic clock and other applications.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: May 2, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Terrence Edward Dyer, Nathan Luke Brockie
  • Patent number: 9553597
    Abstract: Various embodiments improve accuracy by increasing the number of atoms engaged in a clock transitions in an optical lattice clock. An exemplary optical lattice clock an embodiment comprises an optical waveguide, an optical path, a laser light source, and a laser cooler. The optical path has a hollow pathway that extends from a first end to a second end while being surrounded with a tubular wall, which is used as a waveguide path. The optical path passes between mirrors and through the pathway. The laser light source supplies to the optical path a pair of lattice lasers (L1 and L2) propagating in opposite directions with each other. The laser cooler supplies cooled atoms that have two levels of electronic states associated with a clock transition to the vicinity of the first end of the optical waveguide.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: January 24, 2017
    Assignee: RIKEN
    Inventor: Hidetoshi Katori
  • Patent number: 9543894
    Abstract: The present invention relates to using spin transfer torque underneath a nanocontact on a magnetic thin film with perpendicular magnetic anisotropy (PMA), provides generation of dissipative magnetic droplet solitons and report on their rich dynamical properties. Micromagnetic simulations identify a wide range of automodulation frequencies including droplet oscillatory motion, droplet “spinning”, and droplet “breather” states. The droplet can be controlled using both current and magnetic fields, and is expected to have applications in spintronics, magnonics, and PMA-based domain-wall devices.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: January 10, 2017
    Inventor: Johan Akerman
  • Patent number: 9529334
    Abstract: Described examples include a millimeter wave atomic clock apparatus, chip scale vapor cell, and fabrication method in which a low pressure dipolar molecule gas is provided in a sealed cavity with a conductive interior surface forming a waveguide. Non-conductive apertures provide electromagnetic entrance to, and exit from, the cavity. Conductive coupling structures formed on an outer surface of the vapor cell near the respective non-conductive apertures couple an electromagnetic field to the interior of the cavity for interrogating the vapor cell using a transceiver circuit at a frequency that maximizes the rotational transition absorption of the dipolar molecule gas in the cavity to provide a reference clock signal for atomic clock or other applications.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: December 27, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Juan Alejandro Herbsommer, Benjamin S. Cook, Phillip Nadeau, Simon Joshua Jacobs, Django Earl Trombley
  • Patent number: 9503110
    Abstract: A gas cell includes an internal space in which metal atoms and a buffer gas are sealed, the buffer gas includes nitrogen gas, and the partial pressure of the nitrogen gas in the internal space is equal to or higher than 30 Torr. The gas cell includes a pair of window portions and a body portion, the length of the internal space along a direction in which the pair of window portions are arranged is equal to or less than 10 mm, and the width of the internal space along a direction perpendicular to the direction in which the pair of window portions are arranged is equal to or less than 10 mm.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: November 22, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Hiroyuki Yoshida
  • Patent number: 9461659
    Abstract: The invention concerns a micro-machined vapor cell comprising a central silicon element forming a cavity containing vapor cell reactants such as alkali metal or alkali metal azide, buffer gas(es), and/or anti relaxation coating(s); a first and a second glass caps sealing the cavity; and a solenoid arranged to provide a homogeneous magnetic field to said vapor cell. The solenoid is coiled directly on the central silicon element of the vapor cell. This invention is an improvement for the highly miniaturized atomic clocks developments.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: October 4, 2016
    Assignee: CSEM CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE SA—RECHERCHE ET DÉVELOPPEMENT
    Inventors: Thomas Overstolz, Jacques Haesler
  • Patent number: 9444477
    Abstract: An atomic oscillator includes a gas cell into which alkali metal atoms are sealed, a light emitting portion that emits excitation light including a pair of resonance light beams for resonating the alkali metal atoms toward the alkali metal atoms, a coil that is provided to surround an outer circumference of the gas cell with an axis of the excitation light as an axial direction, and a shield case that stores at least the gas cell and the coil and contains a metal material, in which the shield case is constituted by a plurality of tabular portions, and, among the plurality of tabular portions, a main surface of one of two adjacent tabular portions faces a side surface of the other tabular portion.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: September 13, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Koji Chindo
  • Patent number: 9437268
    Abstract: Synthetic antiferromagnetic (SAF) and synthetic ferrimagnetic (SyF) free layer structures are disclosed that reduce Ho (for a SAF free layer), increase perpendicular magnetic anisotropy (PMA), and provide higher thermal stability up to at least 400° C. The SAF and SyF structures have a FL1/DL1/spacer/DL2/FL2 configuration wherein FL1 and FL2 are free layers with PMA, the coupling layer induces antiferromagnetic or ferrimagnetic coupling between FL1 and FL2 depending on thickness, and DL1 and DL2 are dusting layers that enhance the coupling between FL1 and FL2. The SAF free layer may be used with a SAF reference layer in STT-MRAM memory elements or in spintronic devices including a spin transfer oscillator. Furthermore, a dual SAF structure is described that may provide further advantages in terms of Ho, PMA, and thermal stability.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: September 6, 2016
    Assignee: Headway Technologies, Inc.
    Inventors: Yu-Jen Wang, Guenole Jan, Ru-Ying Tong
  • Patent number: 9350368
    Abstract: An atomic cell includes a pair of windows, and a body disposed between the pair of windows and forming an inner space in which alkali metal atoms are sealed along with the pair of windows. The inner space has a longitudinal shape in which a cross-section perpendicular to an arranging direction of the pair of windows extends in a first direction. Further, when a length of the inner space in a second direction perpendicular to the first direction in the cross-section is set to L1, and a length of the inner space in the first direction is set to L2, a relationship of L2/L1?1.1 is satisfied.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: May 24, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Yoshiyuki Maki
  • Patent number: 9319055
    Abstract: A quantum interference device includes: a gas cell in which metal atoms are sealed; a light emitting unit which emits light to the gas cell; a light receiving unit which receives the light penetrating the gas cell and outputs a light receiving signal; an input unit which inputs the light receiving signal; a light receiving circuit which processes the light receiving signal output from the input unit; a high frequency current generation unit which is arranged with the light emitting unit in a line, and generates high frequency current; and a first output unit which outputs the high frequency current output from the high frequency current generation unit to the light emitting unit, in which the gas cell is disposed between the input unit and the first output unit.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: April 19, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Noriaki Tanaka
  • Patent number: 9319056
    Abstract: A quantum interference device includes a gas cell into which metal atoms are sealed, a heater that heats the gas cell, a heat transmission portion that is located between the gas cell and the heater, is connected to the gas cell, and transmits heat generated from the heater to the gas cell, and a heat dissipation portion that is connected to the gas cell so as to be spaced apart from the heat transmission portion, and dissipates heat of the gas cell.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: April 19, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Koji Chindo
  • Patent number: 9312871
    Abstract: A gas cell includes an internal space in which metal atoms and a buffer gas are sealed. The buffer gas includes a gas mixture including nitrogen gas and argon gas. The mole fraction of the argon gas in the gas mixture is equal to or greater than 15% and equal to or less than 40%.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: April 12, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Hiroyuki Yoshida, Tomohiro Tamura
  • Patent number: 9300308
    Abstract: A light emitting device includes a first semiconductor multilayer film mirror of a first conductivity type, a second semiconductor multilayer film mirror of a second conductivity type that is different from the first conductivity type, an active layer formed between the first semiconductor multilayer film mirror and the second semiconductor multilayer film mirror, a third semiconductor multilayer film mirror of a semi-insulating type formed between the first semiconductor multilayer film mirror and the active layer, and a contact layer of the first conductivity type formed between the third semiconductor multilayer film mirror and the active layer, and the third semiconductor multilayer film mirror is formed of a material having a bandgap energy higher than an energy of light generated in the active layer.
    Type: Grant
    Filed: October 15, 2014
    Date of Patent: March 29, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuo Nishida
  • Patent number: 9294109
    Abstract: An optical module for an atomic oscillator using a quantum interference effect includes a light source part to emit resonant light having two different wavelengths, a gas cell in which an alkali metal atom gas is enclosed and to which the resonant light is irradiated, a light detection part to detect an intensity of the resonant light transmitted through the gas cell, and a gas-flow generation part to generate a flow of the alkali metal atom gas.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: March 22, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuo Nishida
  • Patent number: 9276595
    Abstract: An atomic oscillator includes: a base; a unit portion including a gas cell, in which alkali metal atoms are filled, and a heater that heats the gas cell; and a wiring line that electrically connects the base and the unit portion to each other and includes a portion having a cross-sectional area of 60 ?m2 or more and 100 ?m2 or less.
    Type: Grant
    Filed: October 13, 2014
    Date of Patent: March 1, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Yukihiro Hashi, Shoichi Nagamatsu
  • Patent number: 9258002
    Abstract: An optical module for an atomic oscillator using a quantum interference effect includes a first light source unit that emits first resonance light, a gas cell in which an alkali metal atom is sealed, a first light detection unit that detects the intensity of the first resonance light having passed through the gas cell, a determination unit that determines whether or not the first light source unit has failed, a second light source unit that irradiates the gas cell with second resonance light when the determination unit determines that the first light source unit has failed, and a second light detection unit that detects the intensity of the second resonance light having passed through the gas cell, and the optical path length of the first resonance light in the gas cell and the optical path length of the second resonance light in the gas cell are equal to each other.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: February 9, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuo Nishida
  • Patent number: 9203026
    Abstract: A quantum interference device includes a wiring board, a second unit including a gas cell in which metal atoms are sealed, a first unit that includes a light emission unit emitting light, which includes a resonance light pair for resonating the metal atoms, toward the metal atoms, and a supporting plate that has a plate shape, supports the first unit and the second unit on one surface side thereof, and is connected to the wiring board on the other surface side thereof. In addition, a second supporting portion supporting the second unit of the supporting plate includes a portion separated from the wiring board.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: December 1, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Noriaki Tanaka, Tomohiro Tamura, Koji Chindo
  • Patent number: 9197230
    Abstract: An atomic oscillator includes a gas cell, a semiconductor laser, a light detector, a bias current control section controlling a bias current based on intensity of light detected by the light detector, a memory, and an MPU. The MPU sweeps the bias current and stores a value of the bias current and a value of the intensity of the light when the intensity of the detected light shifts from a decrease to an increase and re-sweeps to set the bias current based on the value of the bias current stored in the memory after the sweep, compares the value of the intensity of the detected light with the value of the intensity of the light stored in the memory while the bias current control section controls the bias current, and determines whether to perform the sweep again in accordance with the comparison.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: November 24, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Noriaki Tanaka, Koji Chindo, Hiroyuki Yoshida, Yoshiyuki Maki
  • Patent number: 9196271
    Abstract: According to one embodiment, a spin-torque oscillation element includes a lamination structure containing a spin injection layer, a non-magnetic interlayer formed on the spin injection layer and an oscillation layer formed on the non-magnetic interlayer, and a non-magnetic conductive layer provided on a sidewall of the lamination structure, and the thickness of the lamination structure in a longitudinal direction is 60 nm or less.
    Type: Grant
    Filed: February 4, 2015
    Date of Patent: November 24, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Satoshi Shirotori, Katsuhiko Koui, Mariko Shimizu, Shuichi Murakami, Norihito Fujita
  • Patent number: 9191017
    Abstract: An atomic oscillator includes a base, a unit portion including a gas cell and the like, and a support member that supports the unit portion against the base. The support member includes a plurality of leg portions and a connecting portion that connects the plurality of leg portions to each other. A connection portion between each leg portion and the base is separated from the unit portion in plan view from a direction in which the base and the unit portion overlap each other.
    Type: Grant
    Filed: February 11, 2014
    Date of Patent: November 17, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Yoshiyuki Maki
  • Patent number: 9164491
    Abstract: In an example, a chip-scale atomic clock physics package is provided. The physics package includes a body defining a cavity having a base surface and one or more side walls. The cavity includes a first step surface and a second step surface defined in the one or more side walls. A first scaffold mounted to the base surface in the cavity. One or more spacers defining an aperture therethrough are mounted to the second step surface in the cavity. A second scaffold is mounted to a first surface of the one or more spacers spans across the aperture of the one or more spacers. A third scaffold is mounted to a second surface of the one or more spacers in the cavity and spans across the aperture of the one or more spacers. Other components of the physics package are mounted to the first, second, and third scaffold.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: October 20, 2015
    Assignee: Honeywell International Inc.
    Inventors: Jeff A. Ridley, Robert Compton, Mary K. Salit, Jeffrey James Kriz
  • Patent number: 9118336
    Abstract: A physical system for a chip-scale coherent population trapping (CPT) atomic clock. The physical system includes: a vertical-cavity surface-emitting laser (VCSEL) device, a first polarizing beam splitter, a first ?/4 wave plate, a chip of an atomic vapor cell, a second ?/4 wave plate, a reflection device, a lens, a second polarizing beam splitter, and a photo detector. The first polarizing beam splitter, the first ?/4 wave plate, the chip of the atomic vapor cell, the second ?/4 wave plate, and the reflection device are disposed in sequence. The lens, the second polarizing beam splitter, and the photo detector are disposed in sequence.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: August 25, 2015
    Assignee: Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences
    Inventors: Sihong Gu, Yi Zhang, Suping Qu, Xueming Shi
  • Patent number: 9116510
    Abstract: A chip scale atomic clock (CSAC) accelerometer incorporates a case in which a cesium vapor resonance cell is carried. An optical laser is mounted in the case and emits a laser beam through the resonance cell. The laser is modulated by a microwave signal generator. A photon detector mounted in the case receives photons emitted by cesium atoms in the resonance cell and provides a frequency output representative of interference of energy levels of the emitted photons including momentum changes due to acceleration.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: August 25, 2015
    Assignee: The Boeing Company
    Inventors: Joseph E. Justin, Robert J. Atmur
  • Patent number: 9112518
    Abstract: A heater substrate for heating an alkali metal cell including an alkali metal includes a first heater wiring formed in a region surrounding an alkali metal encapsulating part in which the alkali metal is encapsulated; a second heater wiring formed in the region surrounding the alkali metal encapsulating part and inside the first heater wiring; and a third heater wiring formed outside the first heater wiring. A first electric current flowing in the first heater wiring is divided into a second electric current flowing in the second heater wiring and a third electric current flowing in the third heater wiring. A direction of the first electric current is opposite to a direction of the second electric current and a direction of the third electric current.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: August 18, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kazuhiko Adachi, Kazuhiro Harasaka, Shunichi Sato
  • Patent number: 9097750
    Abstract: A dual purpose atomic device (DAD) for realizing atomic frequency standard and/or magnetic field measurement based on a hybrid technique comprising of enhanced transmission and polarization rotation by the CPT states is invented. The dual purpose atomic device for realizing atomic frequency standard and/or magnetic field measurement basically involving means for generating bi-chromatic field to facilitate the creation of CPT state in an atomic cell and stabilizing the frequency difference among the said bi-chromatic field to the center of the CPT resonance and thereby realizing atomic frequency standard and/or means for monitoring and analyzing transmitted polarization rotation signal from the CPT enabled atomic gas in a sample cell for measuring magnetic field without scanning the radiofrequency oscillator.
    Type: Grant
    Filed: June 23, 2013
    Date of Patent: August 4, 2015
    Assignee: GOVT. OF INDIA ANUSHAKTI BHAVAN, CHATRAPATI SHIVAJI MAHARAJ MARG
    Inventor: Swarupananda Pradhan
  • Patent number: 9083363
    Abstract: Systems and methods for a cold atom frequency standard are provided herein. In certain embodiments, a cold atom microwave frequency standard includes a vacuum cell, the vacuum cell comprising a central cylinder, the central cylinder being hollow and having a first open end and a second open end; a first end portion joined to the first open end; and a second end portion joined to the second open end, wherein the first end portion, the central cylinder, and the second end portion enclose a hollow volume containing atoms, the first end portion and the second end portion configured to allow light to enter into the hollow volume. The cold atom microwave frequency standard also includes a cylindrically symmetric resonator encircling the central cylinder, wherein the resonator generates a microwave field in the hollow volume at the resonant frequency of the atoms.
    Type: Grant
    Filed: November 20, 2013
    Date of Patent: July 14, 2015
    Assignee: Honeywell International Inc.
    Inventors: Chad Fertig, Chad Langness, Karl D. Nelson, Kenneth Salit, Jennifer S. Strabley
  • Patent number: 9077354
    Abstract: A method for reducing or eliminating clock bias in an atomic clock is provided. The method comprises cooling a population of atoms collected in the atomic clock using a laser locked at a predetermined frequency, turning off the laser, performing atomic clock spectroscopy, turning on the laser after the atomic clock spectroscopy, and relocking the frequency of the laser to an external reference cell. The population of atoms that are in each of two ground hyperfine levels is then probed using laser light that is on or near-resonant with a selected atomic transition.
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: July 7, 2015
    Assignee: Honeywell International Inc.
    Inventors: Jennifer S. Strabley, Kenneth Salit, Karl D. Nelson, Ben Luey, Mike Anderson
  • Patent number: 9052698
    Abstract: In one embodiment, an atomic clock for use in an electronic device includes a photodetector with a single-isotope silicon crystal doped with impurity atoms in which a photocurrent generated via a two-photon process within the photodetector is used as a frequency resonance of the atomic clock.
    Type: Grant
    Filed: January 28, 2015
    Date of Patent: June 9, 2015
    Assignee: University of South Florida
    Inventor: Denis Karaiskaj
  • Patent number: 9048853
    Abstract: An atom cell module includes an atom cell in which atoms are enclosed, a heating unit that heats the atom cell by generating heat when a current flows, and a magnetic field generator that generates a magnetic field inside the atom cell. A magnetic field at a predetermined position inside the atom cell generated by the magnetic field generator includes a magnetic field component in an opposite direction to a magnetic field at the predetermined position generated on the basis of a current flowing through the heating unit.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: June 2, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Koji Chindo, Hiroyuki Yoshida
  • Publication number: 20150123739
    Abstract: An optical module of an atomic oscillator includes: a surface emitting laser adapted to emit light; a depolarization element irradiated with the light emitted from the surface emitting laser, and adapted to dissolve a polarization state of the light irradiated; a polarization element irradiated with light having been transmitted through the depolarization element; a ?/4 plate irradiated with light having been transmitted through the polarization element, and having a fast axis disposed so as to rotate by 45 degrees with respect to a polarization transmission axis of the polarization element; a gas cell encapsulating an alkali metal gas, and irradiated with light having been transmitted through the ?/4 plate; and a light detection section adapted to detect intensity of light having been transmitted through the gas cell.
    Type: Application
    Filed: October 31, 2014
    Publication date: May 7, 2015
    Inventor: Tetsuo NISHIDA
  • Publication number: 20150116046
    Abstract: An optical module of an atomic oscillator includes: a surface emitting laser adapted to emit polarized light; a polarization element irradiated with the light emitted from the surface emitting laser, and having a polarization transmission axis disposed so as to be rotated by 45 degrees with respect to a polarization direction of the polarized light; a ?/4 plate irradiated with light having been transmitted through the polarization element, and having a fast axis disposed so as to be rotated by 45 degrees with respect to the polarization transmission axis; a gas cell encapsulating an alkali metal gas, and irradiated with light having been transmitted through the ?/4 plate; and a light detection section adapted to detect intensity of light having been transmitted through the gas cell.
    Type: Application
    Filed: October 28, 2014
    Publication date: April 30, 2015
    Inventor: Tetsuo NISHIDA
  • Patent number: 9019024
    Abstract: An atomic oscillator includes: a gas cell which includes two window portions having a light transmissive property and in which metal atoms are sealed; a light emitting portion that emits excitation light to excite the metal atoms in the gas cell; a light detecting portion that detects the excitation light transmitted through the gas cell; a heater that generates heat; and a connection member that thermally connects the heater and each window portion of the gas cell to each other.
    Type: Grant
    Filed: February 11, 2014
    Date of Patent: April 28, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Yoshiyuki Maki
  • Publication number: 20150109061
    Abstract: Systems and methods for a wafer scale atomic clock are provided. In at least one embodiment, a wafer scale device comprises a first substrate; a cell layer joined to the first substrate, the cell layer comprising a plurality of hermetically isolated cells, wherein separate measurements are produced for each cell in the plurality of hermetically isolated cells; and a second substrate joined to the cell layer, wherein the first substrate and the second substrate comprise electronics to control the separate measurements, wherein the separate measurements are combined into a single measurement.
    Type: Application
    Filed: October 22, 2013
    Publication date: April 23, 2015
    Applicant: Honeywell International Inc.
    Inventors: Jeffrey James Kriz, James L. Tucker, Kenneth H. Heffner, Robert Compton
  • Publication number: 20150102863
    Abstract: An atomic oscillator includes: a base; a unit portion including a gas cell, in which alkali metal atoms are filled, and a heater that heats the gas cell; and a wiring line that electrically connects the base and the unit portion to each other and includes a portion having a cross-sectional area of 60 ?m2 or more and 100 ?m2 or less.
    Type: Application
    Filed: October 13, 2014
    Publication date: April 16, 2015
    Inventors: Yukihiro HASHI, Shoichi NAGAMATSU
  • Publication number: 20150102864
    Abstract: A light emitting device includes a first semiconductor multilayer film mirror of a first conductivity type, a second semiconductor multilayer film mirror of a second conductivity type that is different from the first conductivity type, an active layer formed between the first semiconductor multilayer film mirror and the second semiconductor multilayer film mirror, a third semiconductor multilayer film mirror of a semi-insulating type formed between the first semiconductor multilayer film mirror and the active layer, and a contact layer of the first conductivity type formed between the third semiconductor multilayer film mirror and the active layer, and the third semiconductor multilayer film mirror is formed of a material having a bandgap energy higher than an energy of light generated in the active layer.
    Type: Application
    Filed: October 15, 2014
    Publication date: April 16, 2015
    Inventor: Tetsuo NISHIDA
  • Patent number: 9007136
    Abstract: A light-emitting device module includes a temperature variable device including a temperature control surface subjected to temperature control, a light-emitting device including a first electrode and mounted on a portion of the temperature control surface, a first terminal for supplying electric power to the first electrode, and a wire that causes the first terminal and the first electrode to conduct. The wire is thermally connected to the other portion of the temperature control surface.
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: April 14, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Koji Chindo
  • Publication number: 20150091661
    Abstract: An atomic oscillator includes a gas cell into which a metal atom and a buffer gas are sealed, a light source that emits light for exciting the metal atom in the gas cell, and a light detection unit (light reception unit) that detects the light which has been transmitted through the gas cell, in which the buffer gas includes neon (Ne) and argon (Ar), and a pressure ratio of Ar to the total of Ne and Ar is greater than 0 and less than 0.5.
    Type: Application
    Filed: September 29, 2014
    Publication date: April 2, 2015
    Inventors: Koji CHINDO, Noriaki TANAKA, Tomohiro TAMURA, Hiroyuki YOSHIDA, Yoshiyuki MAKI
  • Publication number: 20150091659
    Abstract: An atomic oscillator includes a gas cell, a semiconductor laser, and a frequency modulation signal generator generating a frequency modulation signal causing the semiconductor laser to generate frequency-modulated light including a first-order sideband light pair causing an electromagnetically induced transparency phenomenon in metal atoms. When a modulation level of frequency modulation changes from low to high, a modulation level at a time when the first-order sideband light is maximized for the first time is represented as m1, a modulation level at a time when intensity of light with a center frequency becomes equal to or higher than intensity of the first-order sideband light for the first time after decreasing to be lower than the intensity of the first-order sideband light for the first time is represented as m2, and intensity of the frequency modulation signal is set such that the modulation level is higher than m1 and lower than m2.
    Type: Application
    Filed: September 18, 2014
    Publication date: April 2, 2015
    Inventors: Satoshi KUBO, Hiroyuki YOSHIDA, Nobuhito HAYASHI, Naoki ISHIHARA, Noriaki TANAKA
  • Publication number: 20150091660
    Abstract: An atomic oscillator includes a gas cell, a semiconductor laser, a light detector, a bias current control section controlling a bias current based on intensity of light detected by the light detector, a memory, and an MPU. The MPU sweeps the bias current and stores a value of the bias current and a value of the intensity of the light when the intensity of the detected light shifts from a decrease to an increase and re-sweeps to set the bias current based on the value of the bias current stored in the memory after the sweep, compares the value of the intensity of the detected light with the value of the intensity of the light stored in the memory while the bias current control section controls the bias current, and determines whether to perform the sweep again in accordance with the comparison.
    Type: Application
    Filed: September 25, 2014
    Publication date: April 2, 2015
    Inventors: Noriaki TANAKA, Koji CHINDO, Hiroyuki YOSHIDA, Yoshiyuki MAKI
  • Publication number: 20150091662
    Abstract: An atomic oscillator includes a gas cell having an internal space in which alkali metal atoms are entrapped, and a light output part that outputs excitation light containing a pair of resonance lights in resonance with the alkali metal atoms toward the internal space. Further, a width of the internal space along a direction perpendicular to an axis of the excitation light is W1, a width of the excitation light along the same direction in the internal space is W2, and a relation of 40%?W2/W1?95% is satisfied.
    Type: Application
    Filed: September 29, 2014
    Publication date: April 2, 2015
    Inventors: Hiroyuki YOSHIDA, Noriaki TANAKA, Koji CHINDO, Tomohiro TAMURA, Yoshiyuki MAKI
  • Publication number: 20150084707
    Abstract: An atomic cell includes a pair of windows, and a body disposed between the pair of windows and forming an inner space in which alkali metal atoms are sealed along with the pair of windows. The inner space has a longitudinal shape in which a cross-section perpendicular to an arranging direction of the pair of windows extends in a first direction. Further, when a length of the inner space in a second direction perpendicular to the first direction in the cross-section is set to L1, and a length of the inner space in the first direction is set to L2, a relationship of L2/L1?1.1 is satisfied.
    Type: Application
    Filed: September 24, 2014
    Publication date: March 26, 2015
    Inventor: Yoshiyuki MAKI
  • Patent number: 8986572
    Abstract: The invention is directed to calcium fluoride crystal optics with improved laser durability that can be used for the transmission of below 250 nanometer (nm) electromagnetic radiation. The optics consists of CaF2 as the major component and Mg in an amount in the range of 13 ppm to 20 ppm while Ce and Mn are <0.5 ppm. The doped crystal and optics made therefrom have a ratio of 515/380 nm transmission loss of less than 0.3 after exposure to greater than 2.8 MRads of ?-radiation. Further, the doped crystal and optics made therefrom exhibit a greatly improved lifetime as shown by ALDT testing to at least 1 billion pulses.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: March 24, 2015
    Assignee: Corning Incorporated
    Inventors: James R Cole, Keith J Donohue, Michael Lucien Genier, Robert Stephen Pavlik, Jr., Michael William Price, William Rogers Rosch, Jeffrey L Sunderland
  • Publication number: 20150061785
    Abstract: An atomic oscillator includes a pair of window units, a wall extending between the pair of window units and forming a first space in which alkali metal in a gas state is housed with the pair of window units, and a second space communicating with the first space and provided in a position with the wall between the first and second spaces and housing alkali metal in a liquid or solid state.
    Type: Application
    Filed: September 4, 2014
    Publication date: March 5, 2015
    Inventor: Naoki ISHIHARA
  • Patent number: 8970309
    Abstract: An atomic oscillator is disclosed, including an Alkaline metal cell, a light source illuminating a laser beam to the Alkaline metal cell, and a light detector detecting light passing through the Alkaline metal cell. The Alkaline metal cell includes a first member, a second member, a cell internal portion, and an Alkaline metal raw material. In the first member, a first glass substrate is bonded on a second surface of a first substrate where a first opening part is formed. In the second member, a second glass substrate is bonded to a fourth surface of a second substrate where a second opening part is formed. The cell internal portion is formed by the first opening part and the second opening part by bonding the first surface to the third surface. The Alkaline metal raw material is enclosed by the cell internal portion.
    Type: Grant
    Filed: July 11, 2012
    Date of Patent: March 3, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Shunichi Sato, Akihiro Itoh, Yukito Sato
  • Publication number: 20150054591
    Abstract: A heater substrate for heating an alkali metal cell including an alkali metal includes a first heater wiring formed in a region surrounding an alkali metal encapsulating part in which the alkali metal is encapsulated; a second heater wiring formed in the region surrounding the alkali metal encapsulating part and inside the first heater wiring; and a third heater wiring formed outside the first heater wiring. A first electric current flowing in the first heater wiring is divided into a second electric current flowing in the second heater wiring and a third electric current flowing in the third heater wiring. A direction of the first electric current is opposite to a direction of the second electric current and a direction of the third electric current.
    Type: Application
    Filed: August 6, 2014
    Publication date: February 26, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Kazuhiko Adachi, Kazuhiro Harasaka, Shunichi Sato
  • Patent number: 8947169
    Abstract: An oscillating device includes an atomic oscillator, an oven controlled crystal oscillator, a correcting unit configured to correct an output signal of the oven controlled crystal oscillator on the basis of an output signal of the atomic oscillator, a housing configured to house the atomic oscillator and the oven controlled crystal oscillator, and a temperature adjusting unit configured to adjust the temperature in the housing to a predetermined temperature.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: February 3, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Tomohiro Tamura, Yoshiyuki Maki, Noriaki Tanaka