Matches 51 - 100 out of 226 < 1 2 3 4 5 >
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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...
5606291 Miniature atomic frequency standard controlled by a digital processor  
A digital controller time multiplexes dithering of the microwave frequency control signal and a laser wavelength control signal in a miniaturized cesium vapor atomic frequency standard. A unique...
5553087 Frequency stabilized laser diode  
A laser diode has its frequency locked to the frequency of an absorption line of rubidium (water and oxides of nitrogen are also disclosed). The level of absorption, and hence the frequency...
5517157 Evanescent-field interrogator for atomic frequency standards  
A novel atomic frequency standard includes an absorption cell containing a first volume of atoms for varying an intensity of light energy passing therethrough; at least one dielectric resonator for...
5491451 Method and apparatus for reduction of atomic frequency standard phase noise  
A method of reducing the interrogation signal phase noise in passive, compact, low-cost commercial atomic standards, particularly phase noise occurring at a Fourier frequency equal to twice the...
5489821 Lamp oscillator for atomic frequency standards  
An apparatus for providing excitation of a vapor discharge lamp includes a control circuit for controlling an oscillator circuit during an ignition mode of the vapor discharge lamp to establish and...
5461346 Atomic beam resonator having cavity coupling device producing odd number of modes  
An atomic beam resonator, particularly a cesium beam resonator, suitable for producing an extremely stable reference frequency. The resonator comprises, arranged in series in the beam direction, a...
5457430 Method and apparatus for reduction of light intensity decay in optical pumping devices  
Optical pumping devices use light reflected from reflecting surfaces to provide a portion of the light incident on the photodetector. Conventional optical pumping devices experience a decay, over...
5451847 Variable energy radio frequency quadrupole linac  
A variable energy radio frequency quadrupole linac for emitting focused and accelerated beams by changing radio frequency energy levels, wherein the accelerating cavity is divided by a plane...
5442326 Atomic time standard with piezoelectric stabilization of diode laser light source  
The wavelength of light generated by a diode laser optically pumping vapor in the gas cell of an atomic time-standard is stabilized against variations in ambient temperature by application of...
5420549 Extended linear ion trap frequency standard apparatus  
A linear ion trap for frequency standard applications is provided with a plurality of trapping rods equally spaced and applied quadrupole rf voltages for radial confinement of atomic ions and...
5387881 Atomic frequency standard  
The atomic frequency standard has a heating element (58) surrounding an enclosure (43) which defines a microwave resonance cavity (42). The heating element supplies heat to an absorption cell (41)...
5379000 Atomic clock employing ion trap of mono- or multi-planar geometry  
An atomic clock system employs one of a family of ion trap configurations confining an ion in a potential well, such that a vibrational frequency confined ion may be measured accurately. The ion...
5327105 Gas cell for a miniaturized atomic frequency standard  
A gas cell for a miniature atomic frequency standard. The gas cell functions not only to contain the cesium vapor, but also as a resonator for the microwave signal used to excite the vapor. By...
5256995 Low helium permeability atomic frequency standard cell and method for forming same  
An atomic frequency standard cell having low helium permeability includes first and second windows sealed by fusible annular gaskets to sealing surfaces defined by a tubular cylindrical body. One...
5248883 Ion traps of mono- or multi-planar geometry and planar ion trap devices  
An ion confinement, i.e., trap, apparatus comprises electrically conductive members, including concentric, coplanar rings or parallel sheets separated by dielectric spacers disposed on the outer...
5192921 Miniaturized atomic frequency standard  
A cell-type atomic frequency standard utilizing a miniaturized gas cell and microwave exciter along with a diode laser light source. The intensity of the diode laser light source counterbalances...
5168478 Time standard assembly with upset protection and recovery means  
A time standard assembly for a global positioning system (GPS), such as for a space vehicle, has a natural-frequency atomic frequency standard (NAFS) which is operated at its natural resonant...
5148122 Atomic beam frequency standard having RF chain with higher frequency oscillator  
An RF chain having a high-frequency oscillator providing first, second and third outputs. The first output is multiplied to provide a microwave signal to an atomic beam tube; the second output is...
5148437 Laser pumped atomic frequency standard with high frequency stability  
A laser emits a laser beam with a predetermined frequency, serving as pumping light, to a double resonance section. A VCO oscillates a predetermined frequency signal that is the origin of a...
5146184 Atomic clock system with improved servo system  
An improved atomic beam clock apparatus and method are disclosed. The invention substantially reduces errors arising from Rabi pulling and variations in the frequency standard resulting from...
5146185 Compact optically pumped resonance system and apparatus  
A compact frequency standard having a dielectrically loaded microwave resonant cavity. One embodiment uses light from a single laser at the frequency that causes F=4➝F'=5 transitions in cesium,...
5107226 Atomic frequency standard using optical pumping for state preparation and magnetic state selection of atoms  
A beam tube atomic standard employing optical pumping for state preparation and magnetic state selection of atoms is disclosed. Atoms selected from the group consisting of the alkali metal family...
4992744 Radio frequency linear accelerator control system  
A control system for controlling a radio frequency resonant cavity type linear accelerator so as to be power-supplied always at a resonance frequency of a resonat cavity constituting the...
4953148 Elimination of magnetic influence on atomic clocks  
Improved atomic clocks and frequency standards of the type where the frequency of an oscillator is stabilized by locking via a phase lock loop to an atomic resonator and where the output of the...
4947137 Passive frequency standard  
The passive frequency standard of this invention comprises a cell (42) containing Rb87 and a source of predetermined spectral component which, by optical pumping, empties the level F=1, m F =0 and...
4943955 Atomic clock  
An atomic clock of the type comprising a quartz oscillator, a tube contaig a material, the atoms of which have an hyperfine spectral transition, control means capable of generating, from the quartz...
4914403 Cesium oscillator  
A cesium oscillator includes a cesium beam tube, and an oscillator circuit which generates an oscillation signal of a frequency to be supplied to the cesium beam tube. A frequency control circuit...
4899117 High accuracy frequency standard and clock system  
A high accuracy atomic frequency standard and clock which utilizes a micrmputer. The microcomputer compensates for aging and temperature variations in the atomic standard and its slave crystal...
4757278 Low noise cryogenic dielectric resonator oscillator  
A microwave oscillator is provided which can operate at a temperature of many degrees above absolute zero while providing very low phase noise that has heretofore generally required temperatures...
4740761 Fine tuning of atomic frequency standards  
A predetermined bias voltage is applied to the input of a summing integrator in a frequency lock loop to provide fine tuning control of a voltage controlled crystal oscillator. In this arrangement,...
4706043 Frequency standard using hydrogen maser  
A compact, self-contained and economical frequency standard uses a passive hydrogen maser to provide an accurate, repeatable, and stable standard frequency. The hydrogen dissociator and microwave...
4692716 Method and a device for the frequency control of an atomic or molecular beam frequency standard  
The method realizes the frequency control of a frequency standard including an atomic or molecular beam resonance apparatus with two microwave cavities, to which an electromagnetic field is fed,...
4684900 Optical pumping cesium resonator and laser diode detection  
A laser diode detection and optical pumping cesium resonator in which the frequency of the laser diode is made dependent on a signal delivered by a detector picking up the fluorescence light...
4661782 Integrated microwave cavity resonator and magnetic shield for an atomic frequency standard  
The subject invention relates to an improved microwave cavity resonator and internal magnetic shield of small design for use with an atomic frequency standard. In an embodiment for an...
4596962 Evacuated, wall-coated, sealed, alkali atom cell for an atomic frequency standard  
An evacuated wall-coated sealed alkali atom cell for an atomic frequency standard, including a cell bulb having an inner wall subjected to cleaning by means of a bakeout step and a r.f. scrubbing...
4517530 Maser cavity servo-tuning system  
Two collocated, weakly coupled probes, on loop and one dipole, detect the magnetic and electric fields inside a maser cavity. Signals from the probes are compared in phase, and the signal output...
4499433 Autolock for resonators for frequency standards  
A system is disclosed for examining the response in atomic and molecular resonators to identify and select the maximum resonant peak and the voltage used to cause said peak to be produced. The...
4495478 Cavity resonator for atomic frequency standard  
An improved microwave cavity resonator for use in vapor-cell atomic frequency standards. The resonator comprises a generally-rectangular hollow metallic body designed to support the TE 101 mode of...
4494085 Miniaturized atomic frequency standard having both filter cell and absorption cell in resonator cavity  
An optical-physics package used in an atomic frequency standard is miniaturized and the performance thereof improved. The optical-physics package includes a microwave cavity in which is positioned...
4479096 Voltage variable crystal controlled oscillator  
A highly stable voltage variable crystal controlled oscillator adapted for stand-alone use or for use with an atomic clock for further stabilizing the oscillator. A novel Colpitts crystal...
4476445 Methods and apparatus for rapid and accurate frequency syntonization of an atomic clock  
Methods and apparatus for rapidly and automatically syntonizing the frequency of a passive atomic resonator of an atomic clock with a reference frequency which corresponds to the frequency of an...
4462006 Method for stabilizing the resonance frequency of a rubidium frequency standard  
A method and apparatus for stabilizing the resonance frequency of a rubidium frequency standard utilizes control of the intensity of the rubidium-87 lightbeam between the rubidium lamp and rubidium...
4456891 Radio frequency source circuit primarily for igniting the lamp of a rubidium frequency standard  
An improved oscillator circuit primarily for use as an RF source circuit for igniting a light discharge in a rubidium lamp used in a rubidium vapor cell frequency standard. A number of novel...
4454482 Atomic or molecular beam frequency standard with optical pumping and open resonator  
The apparatus comprises a source capable of producing an atomic (molecular) beam and at least one electromagnetic resonator of the open type through which the atoms (molecules) pass. Optical...
4449105 Passive maser using timesharing for control of the cavity and control of the oscillator on the line of stimulated emission  
A passive maser wherein control of the cavity and control of the oscillator on the line of stimulated emission operate in a shared-time mode. A control circuit acts on the injected signal by way of...
4446446 Programmable frequency synthesizer primarily for use in an atomic clock  
An adjustable frequency synthesizer primarily for use in an atomic frequency standard of the type used for stabilizing a frequency source by locking it to the hyperfine transition resonance of an...
4434406 Lamp housing assembly primarily for the lamp of a rubidium frequency standard  
A lamp assembly primarily for a rubidium frequency standard and having an improved lamp housing configuration including a cast metal housing which acts as an RF shield for the lamp ignition helical...
4425653 Atomic beam device using optical pumping  
A method and apparatus are disclosed for optically pumping the atoms of an atomic beam into a single trap state. An atomic beam is produced and is passed through a region of weak magnetic field to...
4405905 Atomic frequency standard having microwave loop around absorption cell  
The atomic frequency standard comprises a source of light of a given spectral component, comprising a lamp 2 and an isotopic filter 3. The light arriving in an Rb 87 cell 4 empties the hyperfine...
Matches 51 - 100 out of 226 < 1 2 3 4 5 >