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| Number | Title | Issue Date |
| 8154349 | Atomic clock regulated by a static field and two oscillating fields An atomic clock including a mechanism applying both a static magnetic field and two oscillating magnetic fields, all mutually perpendicular, in a magnetic shield. The amplitudes and frequencies of the oscillating magnetic fields may be chosen so as to annihilate ene... | 04/10/2012 |
| 8143956 | Atomic beam optical frequency atomic clock and a producing method thereof An atomic clock at optical frequency based on atomic beam and a method for generating the atomic clock comprises: The atomic beam (8) is ejected from a pile mouth after heating an atomic pile (1) in a vacuum chamber (2); A laser (4) corre... | 03/27/2012 |
| 8026768 | Hg co-magnetometer for Hg trapped ion space atomic clocks Local magnetic field strength in a trapped ion atomic clock is measured in real time, with high accuracy and without degrading clock performance, and the measurement is used to compensate for ambient magnetic field perturbations. First and second isotopes of an elem... | 09/27/2011 |
| 7902927 | System and method for modulating pressure in an alkali-vapor cell The present invention provides a system and method for achieving a calibration-free primary atomic clock standard operating at the 0-0 transition free-atom frequency, thus creating a primary frequency standard, with attributes that include scalable to chip-scale dim... | 03/08/2011 |
| 7825736 | Method for suppressing light shift in optical pumping systems The present invention relates to a method and system to suppress or eliminate light shift in an optical pumping system, such as an atomic clock. The method uses modulation of a radiation source, such as a radio frequency or microwave source, to simultaneously lock t... | 11/02/2010 |
| 7786808 | Micro-structured optic apparatus A micro-structured optics apparatus includes a concave microlens to expand a beam of light, a reflector to provide a first reflection of at least a portion of the beam of light and a micro-Fresnel lens to collimate the at least a portion of the beam of light after t... | 08/31/2010 |
| 7439814 | Method and system for operating an atomic clock with simultaneous control of frequency and magnetic field The present invention relates to a method and system in which multi-coherent resonances of a microwave in which the alkali-metal atoms in the ground state are driven simultaneously by a microwave hyperfine frequency ΩH and a Zeeman frequency ΩZ | 10/21/2008 |
| 7400207 | Anodically bonded cell, method for making same and systems incorporating same A cell suitable for use with an atomic clock and a method for making the same, the cell including: a silicon wafer having a recess formed therein; at least one amorphous silicate member having an ion mobility and temperature expansion coefficient approximately that ... | 07/15/2008 |
| 7378913 | Optically excited atomic frequency standard An optically-excited atomic frequency standard that subjects alkali metal atoms (111) to circularly-polarized optical radiation. The atomic frequency standard is improved by the use of a circular polarizer (202) to control the intensity of the circular... | 05/27/2008 |
| 7345553 | Method and apparatus for reducing errors due to line asymmetry in devices utilizing coherent population trapping An apparatus and method for measuring CPT is disclosed. The apparatus includes a quantum absorber that is irradiated by radiation from an electromagnetic radiation source. The quantum absorber includes a material that exhibits CPT. The electromagnetic radiation sour... | 03/18/2008 |
| 7323941 | Method and system for operating a laser self-modulated at alkali-metal atom hyperfine frequency The present invention provides a method and apparatus for making atomic clocks or atomic magnetometers as self-modulated laser systems based on the physics of push-pull optical pumping. An atomic vapor cell is required to be in the laser cavity. With proper conditio... | 01/29/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7319522 | Systems and methods for in situ spectroscopic measurements A circularizated semiconductor laser diode (CSLD), such as for example a vertical cavity surface emitting laser (VCSEL) may be used for optical measurements. The CSLD may be used in a cell density probe to perform cell density determination and/or turbidity determin... | 01/15/2008 |
| 7315731 | Method of measuring and calibrating frequency down converter A frequency down converter that maintains accuracy even if the frequency pass band is wide uses a reference frequency band within the frequency pass band, the reference frequency band being resistant to degradation by aging or temperature variation. The ideal charac... | 01/01/2008 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7292111 | Middle layer of die structure that comprises a cavity that holds an alkali metal An apparatus in one example comprises a die structure that comprises a middle layer, a first outside layer, and a second outside layer. The middle layer comprises a cavity that holds an alkali metal, and one of the first outside layer and the second outside layer co... | 11/06/2007 |
| 7215175 | Fuse sensing scheme with auto current reduction An improved circuit for sensing and programming fuses in integrated circuits. The circuit is broadly comprised of a fuse cell, a reference circuit, a sense amplifier and a level detector. In one embodiment of the present invention, a two-stage sensing scheme is impl... | 05/08/2007 |
| 7212050 | System and method for synthesizing a clock at digital wrapper (FEC) and base frequencies using one precision resonator A precision PLL based transceiver having a single precision SAW or crystal resonator is configured to lock onto multiple different input frequencies and output generated clocks at the multiple different frequencies. The input reference frequency may be higher or low... | 05/01/2007 |
| 7205534 | Method and apparatus for in situ depositing of neutral Cs under ultra-high vacuum to analytical ends The present invention relates to a method for modifying the electronic properties of a surface to analytical ends, such as SIMS or electron spectroscopy, characterised in that it comprises in situ deposition of pure neutral cesium (Cs0), under ultra-high ... | 04/17/2007 |
| 7202751 | Optically pumped frequency standard with reduces AC stark shift An apparatus for generating a stabilized frequency signal is disclosed. The apparatus includes a quantum absorber having first, second, and third energy states. The quantum absorber is irradiated by a first radiation source that generates electromagnetic radiation h... | 04/10/2007 |
| 7177332 | Laser frequency stabilization device and a method for laser frequency stabilization A method for stabilizing a laser frequency using sub-Doppler spectral spectrum of atoms, and a laser frequency stabilization device used in the method which is comprised of a gas charged cell, a laser, a laser frequency adjusting means, a laser beam dividing means f... | 02/13/2007 |
| 7173421 | Nuclear spin resonance clock arrangements Nuclear spin resonance (NSR) clock arrangements. ... | 02/06/2007 |
| 7145403 | Static magnetic field applying structure for use in atomic oscillator The present invention relates to a static magnetic field applying structure for use in an atomic oscillator in which plural sets of magnetic field generating means are provided with spacing interposed among them, and a resonance cell is disposed in a space between t... | 12/05/2006 |
| 7119331 | Nanoparticle ion detection A nanoparticle ion detector includes an ion trap that receives charged particles ejected from a mass selection device. A laser beam illuminates the particles to induce fluorescence, which is detected by the photon detector. Particles are periodically dumped from the... | 10/10/2006 |
| 7113046 | Apparatus for supplying a standard frequency signal using a simple microwave synthesis The invention relates to a device (1) for producing a reference frequency signal (Se) from the response of an atomic resonator (R) to a pumping signal (Fat) transmitted thereto, comprising: a first oscillator for production of a first signal (S1) of fr... | 09/26/2006 |
| 7110435 | Spread spectrum applications of universal frequency translation Frequency translation and spread spectrum applications of same are described herein. Such applications include, but are not limited to, unified down-conversion and de-spreading, unified up-conversion and spreading, RAKE receivers utilizing unified down-conversion an... | 09/19/2006 |
| 7110444 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 09/19/2006 |
| 7098744 | Method and apparatus for generating two frequencies having a frequency separation equal to the atomic frequency of an atomic species A method and apparatus that can generate two frequencies separated by the atomic hyperfine frequency separation needed to excite resonance in a Cs atom. In the present invention a coherent light source is frequency modulated with a modulation frequency having a sine... | 08/29/2006 |
| 7081748 | Magnetic resonance scanner with electromagnetic position and orientation tracking device A system for combining electromagnetic position and orientation tracking with magnetic resonance scanner is provided. One embodiment includes a magnetic resonance scanner defining a reference coordinate system for scanning a target. Coupled to the magnetic resonance... | 07/25/2006 |
| 7082171 | Phase shifting applications of universal frequency translation A universal frequency translation module (UFT) frequency translates an electromagnetic (EM) input signal by sampling the EM input signal according to a periodic control signal (also called an aliasing signal). By controlling the relative sampling time, the UFT modul... | 07/25/2006 |
| 7072390 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 07/04/2006 |
| 7064617 | Method and apparatus for temperature compensation Temperature compensation is achieved by adjusting a divide ratio of a multi-modulus divider circuit in a feedback path of a phase-locked loop based on the detected temperature. The divide ratio is adjusted based on stored adjustment values stored in non-volatile mem... | 06/20/2006 |
| 7064619 | Method and apparatus for restarting a GPS-based timing system without a GPS signal A method and apparatus for restarting a GPS-based timing system without a GPS signal is provided. More specifically, there is provided a system comprising an antenna, a GPS receiver coupled to the antenna and configured to generate a GPS traceable timing signal base... | 06/20/2006 |
| 7054296 | Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation Frequency translation and applications of same are described herein, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, ... | 05/30/2006 |
| 7039372 | Method and system for frequency up-conversion with modulation embodiments A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In ... | 05/02/2006 |
| 7030704 | Method and apparatus for a solid-state atomic frequency standard The present invention relates generally to frequency standards. More specifically, the present invention relates to a method and apparatus for solid-state atomic frequency standard based on the hyperfine spectrum of paramagnetic dopants in solids. ... | 04/18/2006 |
| 7027786 | Carrier and clock recovery using universal frequency translation Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. ... | 04/11/2006 |
| 7010286 | Apparatus, system, and method for down-converting and up-converting electromagnetic signals Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive o... | 03/07/2006 |
| 7007188 | Precision bypass clock for high speed testing of a data processor A system clock circuit that provides a high-speed reference clock signal for operating an integrated circuit. The system clock circuit comprises a frequency combiner circuit that receives a first external clock signal having a frequency F1 and a second external cloc... | 02/28/2006 |
