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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 (L 1 , L 2 ) are pulse-modulated in amplitude to illuminate (A) an interactive medium. A detection (B)...
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...
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 D 1 and/or D 2 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...
6710663 Temperature compensation of a rubidium frequency standard  
A rubidium frequency standard is compensated for frequency variations over temperature by allowing the rubidium frequency standard to vary while holding the output frequency constant. A voltage...
6614321 Atomic frequency standard and system having improved long term aging  
An atomic frequency standard system includes two atomic standard devices, a comparison circuit and a correction circuit. The first device operates continuously, while the second device is operated...
6570455 Rubidium atom oscillator generating a stable frequency  
A rubidium atom oscillator is not influenced by a circumference noise or the like, and is excellent in the short-term stability and the phase noise characteristic. A crystal oscillator oscillates a...
6348795 Crystal resonant frequency sensor  
A method for determining a resonant frequency of a mechanical device having a first mass and at least one second mass mechanically coupled to the first mass comprises the steps of: providing a...
6303928 Continuous cold atom beam atomic system  
An improved magneto-optic trap is used to generate a high brightness low velocity continuous source of atoms as a continuous atomic beam. The improved magneto-optic atom trap is using gradient...
6300841 Atomic oscillator utilizing a high frequency converting circuit and an active, low-integral-number multiplier  
In an atomic oscillator, a high-frequency converting circuit converts the output of a standard oscillator into a high frequency signal such that the frequency of the high frequency signal...
6265945 Atomic frequency standard based upon coherent population trapping  
An atomic frequency standard is disclosed where optical pumping of the resonance cell is achieved by coherent light and the pumping results in Coherent Population Trapping of the resonant alkali...
6255647 Atomic frequency standard based on coherent state preparation  
An atomic frequency standard based on coherent microwave emission from an ensemble of hydrogen or alkali metal atoms at their ground state hyperfine frequency. Hydrogen or alkali metal atoms are...
6222424 Optically pumped atomic frequency standard  
An improved optically pumped atomic frequency standard in which excitation light intensity entering the resonance cell is controlled and maintained independently of the optical pump.
6215366 Metallic cell for optically activated atomic frequency standards  
The invention disclosed herein is a cell construction for use in optically activated atomic frequency standards. The cell includes a stiff non-magnetic metallic chamber body having an integral cold...
6172570 Laser light quantum system  
A quantum medium is excited by laser light from a first electromagnetic source and is also exposed to radiation from a second electromagnetic source such that the radiation field from this second...
6157261 Method of controlling the amplitude of the microwave signal applied to an atomic clock and follow-up interlocking device for carrying out this method  
A method of controlling the amplitude of the microwave signal applied to an atomic clock comprising an atomic resonator and a device for interlocking an ultra-stable oscillator in follow-up...
6133800 Subminiature microwave cavity  
An extremely small and inexpensively manufactured physics package for an atomic frequency standard can be provided with a microwave cavity having non-critical dimensions that is driven in a...
6130583 Atomic frequency standard using digital processing in its frequency lock loop  
A passive atomic frequency standard such as a Rubidium Frequency Standard or a Cesium Frequency Standard, using a microprocessor or equivalent circuit as part of its Frequency Locked Loop. The...
6081163 Standard frequency and timing generator and generation method thereof  
A frequency standard generator includes a voltage controlled crystal oscillator (VCXO) for generating high stability output signal, a radio wave receiver to receive a radio wave which includes a...
6025755 Method of stabilizing electromagnetic field strength in an atomic system  
Frequency stabilization of an atomic system is improved by closed loop stabilization of the power level of an atomic excitation signal. A second harmonic atomic Rabi response varies with excitation...
5925987 Printed circuit board mounted electrodeless gas discharge lamp  
An electrodeless discharge lamp having a gas filling consisting of a gas mixture for generating gas-specific resonance radiation, wherein the lamp vessel is made of glass. To facilitate replacement...
5852386 Apparatus and method for microwave field strength stabilization in cell type atomic clocks  
The microwave field intensity of a cell type atomic clock is stabilized through time division feedback control of the power of the microwave signal implemented by a microcontroller. The depth of...
5847613 Compensation of long term oscillator drift using signals from distant hydrogen clouds  
A method and apparatus for compensating for the long term drift of an oscillator. Signals from hydrogen clouds are received and processed to generate an adjustment signal, which is used to adjust...
5838206 Active hydrogen maser atomic frequency standard  
An atomic maser includes a circuit (25) for effecting a shift in the frequency of a signal injected into a resonant cavity (4) so as to generate alternately a first and a second signal portion...
5751193 Rubidium atomic oscillator with laser diode wavelength adjustment  
A rubidium atomic oscillator includes a voltage-controlled oscillator (VCO) producing a first microwave signal for an output, and a light source producing pumping light of which the wavelength is...
5721514 Digital frequency generation in atomic frequency standards using digital phase shifting  
In the generation of frequency-modulated interrogation frequencies for atomic frequency standards, the modulation characteristics can be tailored to the frequency discrimination characteristics of...
5714910 Methods and apparatus for digital frequency generation in atomic frequency standards  
A physics package interrogation signal can be digitally synthesized for use in an atomic frequency standard with one or more sets of integrally-related sub-multiples of a clock frequency in which...
5712597 Rubidium atom oscillator with temperature stabilized frequency output  
A rubidium atom oscillator has an increased allowable temperature range in which a frequency fluctuation due to change in the ambient temperature is suppressed. The frequency is stabilized in an...
5673006 Seamless switch-over frequency synthesizer  
A frequency synthesizer having two atomic frequency standard inputs that is adapted to provide seamless switching or transition between the atomic frequency standard inputs with no change in the...
5670914 Miniature atomic frequency standard  
A miniature atomic frequency standard utilizes a tubular vapor cell extending transversely through a TE 210 microwave cavity. In one embodiment of the invention, the vapor cell is heated directly...
5656974 Atomic frequency oscillator  
The atomic frequency oscillator comprises a resonance cell (41) placed in a microwave resonator (53) surrounded by an electromagnetic shield (58). A laser module (10) emits a light beam which...
5627497 Resonator package for atomic frequency standard  
A resonator package can comprise a microwave container which does not have to be tuned, such as an untuned waveguide, carrying an absorption cell and forming an optical path through its open end...
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