Molecular Resonance Stabilization Patents (Class 331/3)
  • Patent number: 10459784
    Abstract: A frequency signal generator includes a controllable oscillator unit, a frequency control unit and an error detection unit. The controllable oscillator unit generates and provides a frequency signal. The frequency control unit generates a frequency control signal and the controllable oscillator unit varies a frequency of the frequency signal based on the frequency control signal. Further, the error detection unit receives the frequency control signal, detects an error within the frequency control signal and provides an error signal. The error signal comprises information on a detected error.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: October 29, 2019
    Assignee: Infineon Technologies AG
    Inventors: Bernhard Gstöttenbauer, Klemens Kordik
  • Patent number: 10416246
    Abstract: A physics package apparatus for a compact atomic device includes a container having a plurality of slots and an open end, a first vapor cell carrier slidably seated in one of the plurality of slots, a vapor cell coupled to the first vapor cell carrier; and a lid sealably enclosing the open end so that the vapor cell is sealably enclosed in the container.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: September 17, 2019
    Assignee: TELEDYNE SCIENTIFIC & IMAGING, LLC
    Inventors: Jeffrey F. DeNatale, Robert L. Borwick, III, Philip A. Stupar, Viktor Tarashansky
  • Patent number: 10396809
    Abstract: An atomic cell is filled with an alkali metal therein and includes an inner wall which is formed from a material containing a compound having a polar group, a first coating layer which coats the inner wall and is formed from a first molecule having a nonpolar group and a functional group that undergoes an elimination reaction with the polar group, and a second coating layer which coats the first coating layer and is formed from a nonpolar second molecule, wherein the second molecule is polypropylene, polyethylene, or polymethylpentene.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: August 27, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Nobuhito Hayashi, Takuya Miyakawa, Naoki Ishihara, Yoshiyuki Maki
  • Patent number: 10367451
    Abstract: The present invention provides a temperature-compensated crystal oscillator based on digital circuit, a closed-loop compensation architecture is employed to realize the high precision compensation of the crystal oscillator. The output frequency f(T) of the TCXO to be compensated is directly connected with the compensation voltage Vc(T) in real time, and the compensation voltage is fed back to the voltage control terminal of the VCXO to be compensated to compensate, so that the output frequency after compensation is equal to the target frequency signal, thus avoiding the frequency shift of output signal caused by temperature hysteresis, i.e. the discrepancy between the temperature acquired by a temperature sensor and the real temperature of the resonant wafer in the prior art.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: July 30, 2019
    Assignee: UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA
    Inventors: Peng Ye, Feng Tan, Xingqi Liu, Duyu Qiu, Lianping Guo, Kuojun Yang, Qinchuan Zhang, Huiqing Pan
  • Patent number: 10270458
    Abstract: A quantum interference device includes an atom cell, a light source emits light to the alkali metal atoms, a photodetector that detects the light transmitted through the atom cell, a thermal conductor, which is disposed so as to straddle the light source side and the photodetector side of the atom cell, and the thermal conductor having higher thermal conductively than the atom cell, and a support, which is disposed so as to be separated from the thermal conductor, and supports the atom cell, the light source, the photodetector, and the thermal conductor in a lump, the support having lower thermal conductivity than the thermal conductor.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: April 23, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Yoshiyuki Maki, Nobuhito Hayashi
  • Patent number: 10225968
    Abstract: A fixture to enable correct positioning of components in surface mount technology (SMT) field includes a tray, a positioning mechanism, at least one first upper magnet, at least one second upper magnet, and at least one lower magnet. The tray has at least one positioning hole. The positioning mechanism includes a base member, at least one sliding assembly, and at least one positioning post. The sliding assembly is slidably mounted to the base member. The positioning post is mounted to the base member, and disposed in the positioning hole of the tray. The first upper magnet and the second upper magnet are attached to the tray. The lower magnet is attached to the sliding assembly. The tray and the positioning mechanism are repulsive when the lower magnet aligns with the first upper magnet but are attracted when the lower magnet aligns with the second upper magnet.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: March 5, 2019
    Assignees: Fu Tai Hua Industry (Shenzhen) Co., Ltd., HON HAI PRECISION INDUSTRY CO., LTD.
    Inventors: Eddy Liu, Xi-Hang Li, Xue-Feng Che, Ri-Qing Chen, Xing Xia
  • Patent number: 10120039
    Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a magnetic field generator that generates a magnetic field that is applied to the NV diamond material, a radio frequency (RF) excitation source that provides RF excitation to the NV diamond material, an optical excitation source that provides optical excitation to the NV diamond material, an optical detector that receives an optical signal emitted by the NV diamond material, and a controller. The controller is configured to compute a total incident magnetic field at the NV diamond material based on the optical signal emitted by the NV diamond material, and drive the magnetic field generator to generate a compensatory magnetic field, the generated compensatory magnetic field being set to offset a shift in the optical signal emitted by the NV diamond material caused by an external magnetic field.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: November 6, 2018
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: John B. Stetson, Jr., Jeff D. Cammerata
  • Patent number: 10069504
    Abstract: An atomic oscillator includes an atomic cell in which alkali metal atoms are encapsulated, a light source section configured to receive the supply of a bias and emit light including a resonance light pair for causing the alkali metal atoms to resonate, a temperature adjusting element configured to adjust the temperature of the light source section, a bias detecting section configured to detect information concerning the bias, and a light-source-temperature control section configured to control the temperature adjusting element using the information detected by the bias detecting section.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: September 4, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Yoshiyuki Maki
  • Patent number: 10027335
    Abstract: An atomic oscillator includes an atom cell, a first light source device, a second light source device, and a reception section. The atom cell is filled with alkali metal. The first light source device emits a light beam that includes a resonance light beam pair configured to be circularly polarized with each other in the same direction and configured to cause the alkali metal to resonate. The second light source device emits a light beam that includes adjustment light beam configured to be circularly polarized in a reverse direction to the resonance light beam pair. The reception device receives the resonance light beam pair that pass through the atom cell. The adjustment light beam may include the resonance light beam that causes the alkali metal to resonate. In addition, the resonance light beam pair may be a line and the adjustment light beam is a line.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: July 17, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Nobuhito Hayashi, Yoshiyuki Maki
  • Patent number: 9966091
    Abstract: A design for a microwave assisted magnetic recording device is disclosed wherein a spin torque oscillator (STO) between a main pole and write shield has a spin polarization (SP) layer less than 30 Angstroms thick and perpendicular magnetic anisotropy (PMA) induced by an interface with one or two metal oxide layers. Back scattered spin polarized current from an oscillation layer is used to stabilize SP layer magnetization. One or both of the metal oxide layers may be replaced by a confining current pathway (CCP) structure. In one embodiment, the SP layer is omitted and spin polarized current is generated by a main pole/metal oxide interface. A direct current or pulsed current bias is applied across the STO. Rf current may also be injected into the STO to reduce critical current density. A write gap of 25 nm or less is achieved while maintaining good STO performance.
    Type: Grant
    Filed: January 4, 2016
    Date of Patent: May 8, 2018
    Assignee: Headway Technologies, Inc.
    Inventors: Wenyu Chen, Yan Wu
  • Patent number: 9912339
    Abstract: An atomic oscillator includes a gas cell that has metal atoms sealed therein, a heating unit that heats the gas cell, a heat transmission unit that is positioned between the gas cell and the heating unit, is thermally connected to the gas cell, and transmits heat generated by the heating unit to the gas cell, and a light absorbing unit that is thermally connected to the gas cell so as to be separated from the heat transmission unit and absorbs heat of the gas cell. The heat transmission unit includes a gas cell accommodation portion including at least a pair of gas cell accommodation walls disposed outside the gas cell, and a thermal conductive elastic member which is interposed in a gap formed by the gas cell and the gas cell accommodation walls of the heat transmission unit.
    Type: Grant
    Filed: October 3, 2016
    Date of Patent: March 6, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Koji Chindo
  • Patent number: 9755654
    Abstract: A gas cell includes alkali metal enclosed within an internal space configured by a trunk portion and window portions. An interior wall surface of the trunk portion includes a holding portion having a contact angle with liquid alkali metal of less than 90°.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: September 5, 2017
    Assignee: Seiko Epson Corporation
    Inventors: Takuya Nakajima, Yoshiyuki Maki
  • Patent number: 9735733
    Abstract: An atomic oscillator includes an atom cell, a first light source device, a second light source device, and a reception section. The atom cell is filled with alkali metal. The first light source device emits a light beam that includes a resonance light beam pair configured to be circularly polarized with each other in the same direction and configured to cause the alkali metal to resonate. The second light source device emits a light beam that includes adjustment light beam configured to be circularly polarized in a reverse direction to the resonance light beam pair. The reception device receives the resonance light beam pair that pass through the atom cell. The adjustment light beam may include the resonance light beam that causes the alkali metal to resonate. In addition, the resonance light beam pair may be a line and the adjustment light beam is a line.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: August 15, 2017
    Assignee: Seiko Epson Corporation
    Inventors: Nobuhito Hayashi, Yoshiyuki Maki
  • Patent number: 9685909
    Abstract: Some demonstrative embodiments include devices, systems and/or methods of generating a frequency reference using a solid-state atomic resonator formed by a solid-state material including an optical cavity having color centers. A device may include a solid-state atomic clock to generate a clock frequency signal, the solid-state atomic clock including a solid state atomic resonator formed by a solid-state material including an optical cavity having color centers, which are capable of exhibiting hyperfine transition, wherein the solid-state atomic clock may generate the clock frequency signal based on a hyperfine resonance frequency of the color centers.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: June 20, 2017
    Assignee: DIMENSION 4 LTD.
    Inventor: Lahav Gan
  • Patent number: 9654125
    Abstract: A gas cell includes an alkali metal, a pair of window parts, a body part provided between the pair of window parts and forming an internal space in which the alkali metal in a gaseous state is enclosed with the pair of window parts, and a space within a recessed part forming a part of the internal space or communicating with the internal space, in which a liquid-state or solid-state alkali metal is placed, and a bottom part as a wall part between the space within the recessed part and an outside has a smaller thickness than the window parts.
    Type: Grant
    Filed: June 2, 2015
    Date of Patent: May 16, 2017
    Assignee: Seiko Epson Corporation
    Inventor: Takuya Nakajima
  • Patent number: 9601225
    Abstract: An apparatus includes a vapor cell having multiple cavities fluidly connected by one or more channels. At least one of the cavities is configured to receive a first material able to dissociate into one or more gases that are contained within the vapor cell. At least one of the cavities is configured to receive a second material able to absorb at least a portion of the one or more gases. The vapor cell could include a first cavity configured to receive the first material and a second cavity fluidly connected to the first cavity by at least one first channel, where the second cavity is configured to receive the gas(es). The vapor cell could also include a third cavity fluidly connected to at least one of the first and second cavities by at least one second channel, where the third cavity is configured to receive the second material.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: March 21, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Roozbeh Parsa, Peter J. Hopper, William French
  • Patent number: 9595916
    Abstract: A magnetoresistive effect oscillator is provided which can realize a rise or a fall of oscillation at a higher speed. In the magnetoresistive effect oscillator, at the rise, a current having a first current density, which is larger than a critical current density for oscillation, is applied, and thereafter a current having a second current density, which is less than the current density corresponding to the first current density and not less than the critical current density for oscillation, is applied such that the magnetoresistive effect element oscillates at a predetermined frequency. In the magnetoresistive effect oscillator, at the fall, starting from the state where a first current density is applied to hold the magnetoresistive effect element in an oscillating condition, a current having a second current density and having polarity reversed to that of the first current density is applied such that the oscillation disappears.
    Type: Grant
    Filed: October 16, 2014
    Date of Patent: March 14, 2017
    Assignee: TDK Corporation
    Inventors: Tsuyoshi Suzuki, Eiji Suzuki
  • Patent number: 9577652
    Abstract: An atomic resonance transition device includes a gas cell having an internal space that seals an alkali metal, a light emitter that emits excitation light containing a resonance light pair that causes the alkali metal to resonate toward the alkali metal, and a magnetic field generator that applies a magnetic field to the alkali metal. The excitation light diverges in a width direction in the internal space as the light travels from a side where the excitation light is incident toward a side where the excitation light exits, and the magnetic field from the magnetic field generator has a portion where the intensity of the magnetic field increases in the internal space with distance from the side where the excitation light is incident toward the side where the excitation light exits.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: February 21, 2017
    Assignee: Seiko Epson Corporation
    Inventors: Yoshiyuki Maki, Takuya Nakajima, Nobuhito Hayashi
  • Patent number: 9577653
    Abstract: Techniques, systems, and devices are disclosed for implementing a quasi-linear spin-torque nano-oscillator based on exertion of a spin-transfer torque on the local magnetic moments in the magnetic layer and precession of the magnetic moments in the magnetic layer within a spin valve. Examples of spin-torque nano-oscillators (STNOs) are disclosed to use spin polarized currents to excite nano magnets that undergo persistent oscillations at RF or microwave frequencies. The spin currents are applied in a non-uniform manner to both excite the nano magnets into oscillations and generate dynamic damping at large amplitude as a feedback to reduce the nonlinearity associated with mixing amplitude and phase fluctuations.
    Type: Grant
    Filed: January 14, 2014
    Date of Patent: February 21, 2017
    Assignee: CORNELL UNIVERSITY
    Inventors: Robert A. Buhrman, Oukjae Lee, Daniel C. Ralph
  • Patent number: 9531397
    Abstract: An atomic resonance transition device includes an atomic cell in which an atom is sealed, a first light source part to emit a first light resonant with a D1 line of the atom in the atomic cell, a second light source part to emit a second light having a wavelength different from that of the first light and resonant with the D1 line or a D2 line of the atom in the atomic cell, and a detection part to detect a light beat due to interference between the first light and the second light passing through the atomic cell and to generate a beat signal.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: December 27, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Hiroyuki Yoshida, Nobuhito Hayashi
  • Patent number: 9507322
    Abstract: An atomic cell manufacturing method includes a preparing process of preparing a structure that includes a wall portion which forms an inner space and a portion thereof is a light transmission portion, and in which liquid or solid alkaline metals are disposed in the light transmission portion, and an adjusting process of adjusting distribution such that alkaline metals are distributed so as to be intensively disposed on an outer circumferential portion side of the light transmission portion compared to a center portion of the light transmission portion, by heating the light transmission portion.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: November 29, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Yukihiro Hashi
  • Patent number: 9498777
    Abstract: Cells having cavities and the manufacture and use of the same are described. An example cell includes a first layer including a gap to at least partially define a cavity and a reservoir area to receive material to enter the cavity by diffusion. Additionally, the cell includes one or more other layers coupled to the first layer to at least partially define the cavity and to hermetically seal the cavity from an exterior environment.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: November 22, 2016
    Inventors: Henning Völlm, Ulrich Schmid, Andreas Schütze, Helmut Seidel, Dara Feili
  • Patent number: 9488962
    Abstract: The invention relates to an alkali-metal vapor cell, especially for an atomic clock, and to its manufacturing process.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: November 8, 2016
    Assignees: Centre National de la Recherche Scientifique—CNRS, Universite de Franche Comte
    Inventors: Nicolas Passilly, Christophe Gorecki, Ravinder Chutani, Rodolphe Boudot
  • Patent number: 9454135
    Abstract: A method of providing a manufactureable long vapor cell with enhanced sensitivity and good mechanical strength, wherein the method provides a structure that increases the overall length of the vapor cell.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: September 27, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Roozbeh Parsa, Peter J. Hopper
  • Patent number: 9444476
    Abstract: An atomic oscillator includes an alkali-metal cell in which alkali-metal atoms are enclosed, a light source which irradiates the atoms in the alkali-metal cell with laser beams, a photodetector which detects a light amount of the laser beams passing through the alkali-metal cell to enter the photodetector, and a controller which generates sidebands including a pair of laser beams with different wavelengths by performing frequency modulation of a carrier on the light source, causes the pair of laser beams with the different wavelengths to enter the alkali-metal cell, and controls a modulation frequency according to optical absorption characteristics of the atoms by quantum interference effects of a pair of resonance laser beams, wherein the side bands include second-order or higher-order sidebands.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: September 13, 2016
    Assignees: RICOH COMPANY, LTD., Tokyo Metropolitan University
    Inventors: Shigeyoshi Goka, Yuichiro Yano
  • Patent number: 9429918
    Abstract: A vapor cell for installation in an atomic clock or a magnetometer. The vapor cell includes a top plate, a center plate, and a bottom plate defining a cavity for passing light along an optical path. The vapor cell includes one or more condensation sites to trap condensed vapor in order to avoid blockage of the optical path.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: August 30, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Roozbeh Parsa, Peter J. Hopper
  • Patent number: 9360844
    Abstract: Some demonstrative embodiments include devices, systems and/or methods of generating a frequency reference using a solid-state atomic resonator formed by a solid-state material including an optical cavity having color centers. A device may include a solid-state atomic clock to generate a clock frequency signal, the solid-state atomic clock including a solid state atomic resonator formed by a solid-state material including an optical cavity having color centers, which are capable of exhibiting hyperfine transition, wherein the solid-state atomic clock may generate the clock frequency signal based on a hyperfine resonance frequency of the color centers. The device may also include a compensator to compensate for a change in one or more attributes of the solid state atomic resonator, which are to affect the hyperfine resonance frequency of the color centers.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: June 7, 2016
    Assignee: DIMENSION 4 LTD.
    Inventor: Lahav Gan
  • Patent number: 9356426
    Abstract: An atomic oscillator includes a first unit and a second unit arranged to be separated from each other and a package including an internal space in which the first unit and the second unit are housed in a state in which the internal space is decompressed to pressure lower than the atmospheric pressure. The reflectance of the outer surfaces of the first unit and the second unit to an electromagnetic wave having a wavelength of 4 ?m is equal to or higher than 50%.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: May 31, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Koji Chindo
  • Patent number: 9350369
    Abstract: A quantum interference device includes: a gas cell housing metal atoms; a light emitting unit emitting light to the gas cell; a light receiving unit receiving light penetrating the gas cell; a cell temperature control unit controlling the gas cell temperature; a light emitting unit temperature control unit controlling the light emitting unit temperature; an analog circuit including a light receiving circuit which processes a light receiving signal output from the light receiving unit, and controls an atomic resonance signal; a digital circuit controlling the analog circuit; a first substrate; and a second substrate. The light receiving circuit is provided on the first substrate. At least one of the cell temperature control unit, the light emitting unit temperature control unit, and the digital circuit is provided on the second substrate. The first and second substrates at least partially overlap with each other in a plan view.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: May 24, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Noriaki Tanaka
  • Patent number: 9348321
    Abstract: Methods, time consumer systems, and computer program products for maintaining accurate time on an ideal clock of a timing device are disclosed. The method includes receiving time information from a local clock, a reference clock, and one or more secondary clocks. The method further includes calculating frequencies for the local clock, the reference clock, and the one or more secondary clocks. The method further includes comparing the calculated frequencies of the reference clock to the calculated frequencies of the one or more secondary clocks. The method further includes detecting a holdover and/or a compromise situation based on the comparison. The method further includes syntonizing the ideal clock to one or more of the calculated frequencies.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: May 24, 2016
    Assignee: FINITE STATE RESEARCH LLC
    Inventors: Cort Dougan, Victor Yodaiken
  • Patent number: 9342269
    Abstract: An atomic oscillator includes: a gas cell which houses metal atoms; a heater which adjusts a temperature of the gas cell; and a package which houses the gas cell and the heater. The package includes a non-magnetic metal layer.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: May 17, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Yukihiro Hashi
  • Patent number: 9325334
    Abstract: A frequency reference device that includes a frequency reference generation unit to generate a frequency reference signal based on an absorption line of a gas.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: April 26, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Phillip Michel Nadeau, Django Trombley, Baher S. Haroun, Srinath Mathur Ramaswamy
  • Patent number: 9318750
    Abstract: A manufacturer of gas cells performs an arrangement process of arranging solid substances at positions corresponding to holes each of which is provided on each of a plurality of cells. Then, the manufacturer of the gas cells performs an accommodation process of accommodating gas in inner spaces of the cells through an air flow path connected to the holes. Further, the manufacturer of the gas cells performs a sealing process of sealing the spaces by melting the solid substances to close the holes corresponding to the solid substances.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: April 19, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Kimio Nagasaka
  • Patent number: 9274186
    Abstract: A gas cell semiconductor chip assembly includes a gas cell including an alkali gas stored therein and a first semiconductor chip including a first resistive heating loop at a location corresponding to the gas cell to heat the gas cell and a second resistive heating loop around an outer perimeter of the first resistive heating loop. The second resistive heating loop is configured to cancel a magnetic field of the first resistive heating loop based on a current flowing through the first and second resistive heating loops.
    Type: Grant
    Filed: July 2, 2013
    Date of Patent: March 1, 2016
    Assignee: The Johns Hopkins University
    Inventors: Haje Korth, Kim Strohbehn, Andreas G. Andreou, Francisco Tejada
  • Patent number: 9201403
    Abstract: Some demonstrative embodiments include devices, systems and/or methods of generating a frequency reference using a solid-state atomic resonator formed by a solid-state material including an optical cavity having color centers. A device may include a solid-state atomic clock to generate a clock frequency signal, the solid-state atomic clock including a solid state atomic resonator formed by a solid-state material including au optical cavity having color centers, which are capable of exhibiting hyperfine transition, wherein the solid-state atomic clock may generate the clock frequency signal based on a hyperfine resonance frequency of the color centers.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: December 1, 2015
    Assignee: DIMENSION 4 LTD.
    Inventor: Lahav Gan
  • Patent number: 9136851
    Abstract: An atomic oscillator includes an alkali metal cell encapsulating an alkali metal atom; a light source that emits laser light; a light detector that detects light which has passed through the alkali metal cell; and a polarizer arranged between the alkali metal cell and the light detector. A modulation frequency in the light source is controlled, according to a coherent population trapping resonance which is a light absorption characteristic of a quantum interference effect for two kinds of resonant lights, by modulating the light source to generate sidebands and injecting laser lights with the sidebands into the alkali metal cell. A magnetic field is applied on the alkali metal cell in a direction parallel to a propagating direction of the laser light, and the laser light entering the alkali metal cell has a linear polarization, which is not parallel to a polarization direction of the polarizer.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: September 15, 2015
    Assignees: RICOH COMPANY, LTD., Tokyo Metropolitan University, Municipal University Corp.
    Inventors: Yuichiro Yano, Shigeyoshi Goka
  • Patent number: 9134450
    Abstract: A cold atom gravity gradiometer system includes a laser source that generates a laser beam that propagates along a propagation direction. The system further includes a reflector that reflects a portion of the laser beam and transmits another portion of the laser beam (the transmitted portion). A second reflector spatially separated from the first reflector along the propagation direction reflects the transmitted portion of the laser beam.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: September 15, 2015
    Assignee: MUQUANS
    Inventors: Bruno Desruelle, Philippe Bouyer, Arnaud Landragin
  • Patent number: 9130579
    Abstract: An atomic oscillator includes an atomic cell in which an atom is enclosed, a magnetic field generation part to apply a magnetic field to the atomic cell, a reference oscillator which is controlled based on an atomic resonance signal outputted from the atomic cell and generates a reference signal, and a fractional N-PLL which receives the reference signal to generate a signal including a resonance frequency of the atom, in which when a maximum digit of the resonance frequency adjustable by the magnetic field generation part is a boundary digit, the fractional N-PLL can adjust at least a digit one digit higher than the boundary digit.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: September 8, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Yoshiyuki Maki
  • Patent number: 9054638
    Abstract: An optical module of an atomic oscillator using a quantum interference effect includes a light source to generate first light including a fundamental wave having a center wavelength, and including a first sideband wave and a second sideband wave having wavelengths that are different from each other, a wavelength selection unit that emits second light by selecting the first sideband wave and the second sideband wave of the first light and by allowing them to pass through, a gas cell in which an alkali metal gas is sealed and to which the second light is irradiated, and a light detection unit that detects an intensity of the second light passing through the gas cell.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: June 9, 2015
    Assignee: Seiko Epson Corporation
    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
  • 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
  • Patent number: 8922284
    Abstract: A method of controlling an atomic oscillator includes generating a resonant light pair in response to a center frequency signal and a sideband signal, and setting the sideband signal so that an electromagnetically induced transparency (EIT) phenomenon does not occur in a gas cell of the atomic oscillator. The method includes applying the resonant light pair to the gas cell and detecting an intensity level of light transmitted through the gas cell. While the sideband signal is set so that the EIT phenomenon is not occurring, the center frequency signal is varied until a minimum value of the intensity level is identified. A first frequency is calculated by subtracting a predetermined frequency offset from the center frequency at which the intensity level was equal to the minimum value. A center frequency of the resonant light pair is set to the first frequency for operation of the atomic oscillator.
    Type: Grant
    Filed: July 23, 2012
    Date of Patent: December 30, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Taku Aoyama, Koji Chindo
  • Patent number: 8922283
    Abstract: A wristwatch, which comprises an atomic oscillator comprising a system for detecting the beat frequencies obtained by the Raman effect.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: December 30, 2014
    Assignee: ROLEX S.A.
    Inventors: Laurent Balet, Jacques Haesler, Steve Lecomte, David Ruffieux
  • Patent number: 8922285
    Abstract: The invention relates to a radiofrequency oscillator which incorporates: a spin-polarized electric current magnetoresistive device (6), a terminal (18) for controlling the frequency or amplitude of the oscillating signal, a servo loop (34) connected between the output terminal and the control terminal for applying a control signal to the control terminal in order to slave a characteristic of the oscillating signal to a reference value, the servo loop (34) comprising: a sensor (36) of the amplitude of the oscillating signal oscillations, and a comparator (38) capable of generating the control signal according to the measured amplitude and the reference value.
    Type: Grant
    Filed: March 1, 2011
    Date of Patent: December 30, 2014
    Assignees: Commissariat à l'énergie atomique et aux énergies alternatives, Centre National de la Recherche Scientifique
    Inventors: Dimitri Houssameddine, Bertrand Delaet, Marie-Claire Cyrille, Ursula Ebels, Michael Quinsat
  • Patent number: 8878617
    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: January 9, 2013
    Date of Patent: November 4, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuo Nishida
  • Patent number: 8864546
    Abstract: A building block set comprises a plurality of transparent blocks each having a hollow internal cavity with a light source fitted within each cavity and first and second electrically conductive connectors extending through each block and into the internal cavity with a circuit within the cavity for illuminating the light in response to an electronic input to either connector.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: October 21, 2014
    Inventor: Jon P. Capriola
  • Patent number: 8860515
    Abstract: An atomic oscillator, a control method of the atomic oscillator and a quantum interference apparatus are provided in which high frequency stability can be maintained even though EIT signal intensity changes.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: October 14, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Taku Aoyama, Tetsuya Takahashi
  • Patent number: 8854146
    Abstract: Embodiments of the present invention provide improved systems and methods for external frit mounted components on a sensor device. In one embodiment, a method for fabricating a sensor device comprises securing at least one component stack on a sensor body over at least one opening in the sensor body, wherein the at least one component stack comprises a plurality of components and applying a frit to the plurality of components in the at least one component stack and the sensor body. The method further comprises heating the frit, the at least one component stack, and the sensor body such that the frit melts and cooling the frit, the at least one component stack, and the sensor body such that the at least one component stack is secured to the sensor body.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: October 7, 2014
    Assignee: Honeywell International Inc.
    Inventors: Christina Marie Schober, Jennifer S. Strabley, Bernard Fritz, James A. Vescera, Kenneth Salit, Delmer L. Smith, Terry Dean Stark
  • Patent number: 8847692
    Abstract: Oscillators and method of operating the same are provided, the oscillators include a magnetic layer, and a magnetization fixing element configured to fix a magnetization direction of the magnetic layer. The oscillators generate a signal by using precession of a magnetic moment of the magnetic layer.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: September 30, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ung-hwan Pi, Sun-ae Seo, Kee-won Kim, In-jun Hwang, Kwang-seok Kim, Sung-chul Lee
  • Patent number: 8836437
    Abstract: An optical module for an atomic oscillator using a quantum interference effect includes a light source adapted to emit light including a fundamental wave having a predetermined wavelength, and sideband waves of the fundamental wave, a wavelength selection section receiving the light from the light source, and adapted to transmit the sideband waves out of the light input, a gas cell encapsulating an alkali metal gas, and irradiated with light transmitted through the wavelength selection section, and a light detection section adapted to detect an intensity of light transmitted through the gas cell, and the wavelength selection section includes a fiber Bragg grating, and a temperature control section adapted to control temperature of the fiber Bragg grating.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: September 16, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuo Nishida