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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...
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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...
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7338615 |
Dielectric media
A novel method of fabrication of periodic dielectric composites involving a flexible computer design stage, rapid growth of a second dielectric component. Laser stereolithography is used to form...
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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...
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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...
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7241630 |
Paramagnetic particle detection
A method of determining the number of magnetic particles within a sample using a tuned circuit having a capacitor and a coil. The method comprises:
a. determining the difference in the...
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7221231 |
Discharge lamp stabilization system
An RF-discharge lamp stabilization system for preferred use in a Rubidium atomic clock, senses acoustic oscillations of plasma ions in the 20.0 kHz range to assess the performance of the lamp for...
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7215213 |
Apparatus and system for suspending a chip-scale device and related methods
A suspension of a chip-scale device is accomplished using a suspension frame and at least one first tether. The chip-scale suspension frame defines a first plane and an opening through the...
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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...
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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...
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7142066 |
Atomic clock
An atomic clock may include substantially isolated particles that are capable of exhibiting hyperfine transitions. An alignment device of the clocks may establish a predominant direction of spin of...
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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...
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7102451 |
Method and system for operating an atomic clock with alternating-polarization light
The present invention provides a method and apparatus for increasing the intensity of coherent population trapping (CPT) resonances, used in atomic clocks and magnetometers, by pumping the atoms...
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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...
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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...
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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...
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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...
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6900702 |
MEMS frequency standard for devices such as atomic clock
A frequency standard has a cell formed in a cavity of a substrate. The cell contains a metal alkali vapor. The substrate has an optical path that intersects the cell. A light source is supported by...
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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...
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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...
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6654470 |
Frequency warping for improving resonator signal-to-noise ratio
A sensor circuit for use in measuring concentrations of an analyte in a fluid is comprised of a BAW sensor, a voltage variable capacitor connected to the sensor, an input which supplies a bias...
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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...
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6570459 |
Physics package apparatus for an atomic clock
Physics package apparatus for a cell type atomic clock includes a cell structure having a central plate sandwiched between top and bottom plates. The central plate has a central interior aperture...
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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...
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6547982 |
Dielectric composites
A method of fabricating a dielectric medium comprising two materials with discrete interfaces between the two materials and media formed from the dielectric medium.
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6320472 |
Atomic frequency standard
An atomic frequency standard based on the ground state hyperfine resonance line observed by means of coherent radiation fields creating Coherent Population Trapping (CPT) in an alkali metal atomic...
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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...
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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...
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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...
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6225870 |
Miniaturized microwave cavity for atomic frequency standard
The present invention relates to a kind of microwave cavity for atomic frequency standard, which consists of slotted tube, cylindrical cavity body, dielectric ring, heating filament, screw bolt for...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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5847618 |
Atomic maser with cylindrical sapphire storage bulb
An atomic maser comprises a walled enclosure (76) defining a resonant cavity (4), and a storage bulb (8) for storing a medium capable of stimulated emission. The storage bulb is a sapphire cylinder...
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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...
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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...
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5780971 |
Method and apparatus for generating radiation utilizing DC to AC conversion with a conductive front
Method and apparatus for generating radiation of high power, variable duration and broad tunability over several orders of magnitude from a laser-ionized gas-filled capacitor array. The method and...
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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...
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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...
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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...
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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...
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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...
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5657340 |
Rubidium atomic clock with fluorescence optical pumping and method using same
A stabilized atomic clock system uses a stabilized 780.2 nm pump laser for exciting rubidium-85 atoms fluorescing to optically pump rubidium-87 atoms both contained in a gas cell enclosed in a...
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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...
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