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8183942 Atomic clock operating with helium 3  
An atomic clock comprises helium 3 plasma as measurement medium, which is taken to the plasma state to exploit the metastable state of the material and the levels of the hyperfine structure, the...
8179294 Apparatus and method for the calibration of delta-sigma modulators  
The application relates to a calibration apparatus and calibration method for a tuneable resonator of a delta-sigma modulator of the continuous time, band pass type. The calibration apparatus...
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...
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)...
8121223 Architectures for universal or software radio  
A system and technique for providing to flexible, programmable frequency estimators and spectrum analyzers that can operate over extremely large bandwidths and yet provide high spectral resolution...
8067990 Atomic oscillator  
An atomic oscillator includes: a gas cell in which a gaseous metal atom is sealed; heating units heating the gas cell to a predetermined temperature and being a first heater and a second heater; a...
8063709 Spin-transfer torque oscillator  
The invention relates to a method of operating a spin-transfer torque structure to generate voltage oscillations, said structure comprising a first layer of magnetic material having a fixed...
8058936 Atomic ion clock with two ion traps, and method to transfer ions  
An atomic ion clock with a first ion trap and a second ion trap, where the second ion trap is of higher order than the first ion trap. In one embodiment, ions may be shuttled back and forth from...
8031010 Ruggedized chip scale atomic clock  
The present invention is a Chip Scale Atomic Clock (CSAC)-enabled Time and Frequency Standard (CTFS) architecture. The CTFS architecture includes a microcontroller, a Time Compensated Crystal...
8026768 201Hg+ co-magnetometer for 199Hg+ 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...
8009520 Method and system for operating an atomic clock using a self-modulated laser with electrical modulation  
A polarization gain medium such as an emitting laser diode provides the optical pumping. An atomic vapor cell is positioned in the laser cavity providing spontaneous push-pull optical pumping...
7999626 Physical section of atomic oscillator  
A physical section of an atomic oscillator includes at least: a gas cell including a cylindrical portion and first and second windows respectively hermetically-closing openings of both sides of the...
7973611 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...
7965147 Physics package design for a cold atom primary frequency standard  
A physic package for an atomic clock comprising: a block made of optical glass, a glass ceramic material or another suitable material that includes a plurality of faces on its exterior and a...
7965148 Atomic frequency clock systems and methods  
One embodiment of the invention includes an atomic clock system including an alkali beam cell and an interrogation system configured to generate an optical pump beam and at least one optical probe...
7956697 Atomic oscillator  
An atomic oscillator that controls an oscillation frequency by using an optical absorption property derived from a quantum interference effect occurring when two kinds of resonance light are made...
7944317 Cold atom micro primary standard  
An atomic clock having a physics package that includes a vacuum chamber cavity that holds atoms of Rb-87 under high vacuum conditions, an optical bench having a single laser light source, a local...
7940133 Atomic frequency acquiring apparatus and atomic clock  
An atomic frequency acquisition apparatus includes: a cell enclosing atomic gas therein; a laser light source that oscillates a laser light that enters the cell and excites the atomic gas; and a...
7911611 Optical system of atomic oscillator and atomic oscillator  
An optical system of an atomic oscillator that regulates an oscillation frequency by using an optical absorption property by one of a double resonance method utilizing light and micro waves and a...
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...
7893780 Reversible alkali beam cell  
One embodiment of the invention includes an alkali beam cell system that comprises a reversible alkali beam cell. The reversible alkali beam cell includes a first chamber configured as a reservoir...
7859350 Microfabricated ion frequency standard  
A microfabricated ion frequency standard (i.e. an ion clock) is disclosed with a permanently-sealed vacuum package containing a source of ytterbium (Yb) ions and an octupole ion trap. The source of...
7852163 Batch-fabricated, RF-interrogated, end transition, chip-scale atomic clock  
A chip scale atomic clock is disclosed that provides a low power atomic time/frequency reference that employs direct RF-interrogation on an end-state transition. The atomic time/frequency reference...
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,...
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...
7701302 Atomic frequency acquiring apparatus and atomic clock  
An atomic frequency acquisition apparatus includes: a cell enclosing atomic gas therein; a laser light source that oscillates a laser light that enters the cell and excites the atomic gas; and a...
7656241 Optical pumping device and method  
A method for optical pumping of particles and a device for implementing same. The particles (14) are changed from one long lifetime level to another long lifetime level via a short lifetime level...
7635903 Oscillator and method of manufacture  
An oscillator includes at least one of: (i) a parallel array of resistors (420, 421, 422, 701, 801, 901, 902) or magnetoresistive contacts to a magnetoresistive film (120, 320); and (ii) a series...
7619485 Compact optical assembly for chip-scale atomic clock  
Provided is a chip-scale atomic clock having a folded optic configuration or physics package. In particular, the physics package includes a vapor cell for containing gaseous alkali atoms and a...
7501906 Method for modulating an atomic clock signal with coherent population trapping and corresponding atomic clock  
Method for modulating an atomic clock signal and a corresponding atomic clock. The laser beams (L1, L2) are pulse-modulated in amplitude to illuminate (A) an interactive medium. A detection (B) of...
7468637 Batch-fabricated, RF-interrogated, end transition, chip-scale atomic clock  
A chip scale atomic clock is disclosed that provides a low power atomic time/frequency reference that employs direct RF-interrogation on an end-state transition. The atomic time/frequency reference...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
6993058 Coherent population trapping detector  
A CPT detector and a method for detecting CPT are disclosed. The CPT detector includes a quantum absorber, a polarization analyzer, and a detector. The quantum absorber includes a material having...
6985043 Atomic oscillator  
A compact atomic oscillator with improved frequency stability. A voltage-controlled oscillator generates an oscillation signal based on a given control voltage, and a modulator modulates it with a...
6972631 Rubidium frequency standard control method and system for voltage-controlled oscillators  
A rubidium frequency standard control circuit which utilizes an initial sweep hand-off frequency locking process followed by a negative feedback loop for optimization of the stability of the...
6927636 Light stabilization for an optically excitable atomic medium  
In an apparatus using optically excited atomic media, such as an atomic frequency standard, a source providing a controlled emission of light for exciting the D1 and/or D2 resonance lines of an...
6831522 Method of minimizing the short-term frequency instability of laser-pumped atomic clocks  
A method is provided for optimizing the performance of laser-pumped atomic frequency references with respect to the laser detuning and other operating parameters. This method is based on the new...
6812800 Atomic oscillator  
In an atomic oscillator of an optical pumping system, a slot line resonator, as a microwave resonator, is arranged in a portion where atoms are excited. The slot line resonator forms a microstrip...
6806784 Miniature frequency standard based on all-optical excitation and a micro-machined containment vessel  
A microwave frequency standard is provided which allows for miniaturization down to length scales of order one micron, comprising a modulated light field originating from a laser that illuminates a...
6801091 Oscillator controller and atomic oscillator  
An oscillator controller which optimizes key circuit parameters of an excitation circuit according to the operating condition of a discharge lamp. An excitation circuit energizes a discharge lamp...
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