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4349798 |
Compact microwave resonant cavity for use in atomic frequency standards
A compact resonant cavity with a substantially uniform magnetic field in the cavity is formed by lumped resonantly loading a rectangular primary cavity. The lumped capacitive load is produced by...
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4331933 |
Microwave power level stabilizing circuit for cesium beam frequency standards
Perceived atomic resonance frequency error resulting from microwave power level changes in atomic clocks is eliminated by controlling the device's microwave power source output in response to...
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4326174 |
Passive masers having alternately operated oscillator and cavity control loops
The invention, which may be used in particular as a frequency standard, seeks to avoid disturbance in the control action in respect of the cavity 10 by a powerful parasite signal due to the line of...
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4323860 |
Laser excited molecular beam time and frequency standard
A laser excited molecular beam time and frequency standard utilizing a first electromagnetic beam at a first preselected frequency to excite a molecular beam at a first preselected point along the...
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4316153 |
Passive masers having oscillator and cavity control loops
The maser of the invention is particularly suitable for forming a frequency standard, by virtue of its excellent degree of frequency stability. The stimulating signal injected into a hydrogen maser...
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4315224 |
Laser stimulated Raman molecular beam time and frequency standard
A laser stimulated Raman molecular beam time and frequency standard utilizing a first electromagnetic beam at a first preselected frequency to pump a molecular beam at a first preselected point...
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4314209 |
Q-Enhanced resonance-stabilized maser
Self-sustained oscillation of the atoms in a maser is achieved in a cavity of reduced size by in-phase feedback for cavity Q-enhancement. Cavity resonant frequency is stabilized using a small...
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4303893 |
Frequency synthesizer incorporating digital frequency translator
The use of a digital frequency translator, using pulse snatching techniques, for multiplying the output frequency of a precise and accurate frequency synthesizer by a preselected certain numerical...
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4290030 |
Atomic frequency standard using free induction technique
In the free induction technique of this invention, the maser is externally stimulated to allow significant reduction of the size of the maser, and the stimulation is turned off and allowed to decay...
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4193029 |
Pulsed helium magnetometer
1. A pulsed helium magnetometer comprising; a cell containing metastable helium adapted to be placed in a magnetic field to be measured, means including a helium lamp for optically pumping...
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4158286 |
Horologic instruments with random timing source
An electronic horologic instrument, such as an electronic watch or clock, utilizes randomly-generated energy to produce electrical pulses in synchronism with the generated energy. The electrical...
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4146848 |
Frequency stabilizing system and method for beam type device
Frequency stabilization of a beam type device is disclosed that is particry well suited for avoiding cavity phase shift problems. A beam generator provides a molecular or atomic beam that is...
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4122408 |
Frequency stabilization utilizing multiple modulation
A system and method is disclosed for achieving frequency stabilization. A tunable element, such as a cavity structure, is stabilized through the use of multiple modulation to stabilize both the...
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4107623 |
Parallel analog and digital control loops for phase locking precision oscillator to reference oscillator
A control device for accurately maintaining the frequency of a quartz crystal oscillator. The control device includes reference oscillators and two control loops in parallel, a first digital...
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3967115 |
Atomic beam tube
An atomic beam tube provides a single sealed envelope structure that serves both as vacuum envelope and as structural member to which the operative components are attached. The envelope is composed...
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3924200 |
Atomic standard with variable storage volume
A cylindrical, convoluted, flexible bellows is used to form an atomic or molecular storage vessel with constant surface area and surface properties but adjustable volume. When utilized as a storage...
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3921085 |
Frequency discriminator apparatus
A frequency discriminator having a bandwidth variable from a relatively narrow range to a very wide range in which the center frequency is simultaneously tunable over an extremely wide frequency...
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3903481 |
Gas cell atomic frequency standard having selected alkali vapor isotope ratios
An atomic frequency standard is provided utilizing a spectral lamp and a cell, both lamp and cell being filled with a vaporous alkali element. The alkali element in the cell and/or lamp is...
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3902134 |
Energy-state-selected cesium beam intensifier
A cesium-beam atomic frequency standard in which the beam from the effuser s reflected from a reflector target surface placed between the concave and convex polepieces of the A-magnet energy-state...
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3792368 |
METHOD OF TUNING THE OSCILLATION FREQUENCY OF THE RESONANT CAVITY OF A MASER OSCILLATOR TO THE TRANSITION FREQUENCY OF STIMULATED EMISSION OF THE ACTIVE MEDIUM OF SAID MASER
The method consists in periodically modulating the level of oscillation of the maser ; in detecting the phase variation of the maser oscillation with respect to the oscillation of a reference...
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3733511 |
MOLECULAR BEAM TUBE HAVING MEANS FOR DEGAUSSING THE MAGNETIC SHIELDING STRUCTURE
The polarizing magnetic field structure of a molecular beam tube is degaussed during operation of the tube by a circuit including a solenoid coil coupled to a very low frequency, square wave,...
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3729674 |
DIGITAL NUCLEAR GYROSCOPIC INSTRUMENTATION AND DIGITAL PHASE LOCKED LOOP THEREFOR
A pair of spin generators maintained parallel to each other, but in opposite directions thereto, are phase locked with respect to each other and an output is provided indicative of the inertial...
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3720882 |
PARAMETRIC FREQUENCY CONVERSION
Parametric frequency conversion is effected in a sample of material, such as an alkali vapor, having an energy level system including first and second energy levels with a first transition...
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3670171 |
ATOMIC BEAM TUBE HAVING A HOMOGENIOUS POLARIZING MAGNETIC FIELD IN THE RF TRANSITION REGION
An atomic beam tube has a magnetic C-field region which produces a very uniform static magnetic polarizing field transverse to the path of the atomic beam. The C-field is produced by two coils...
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3667066 |
OPTICALLY PUMPED ALKALI ATOMIC BEAM FREQUENCY STANDARD
The frequency standard comprises an oven producing a beam of Rb 85 and Rb 87 , a lamp using Rb 85 for enriching the level F = 1 of the fundamental state of the atoms of Rb 87 , a hyperfrequency...
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3617923 |
BEAT FREQUENCY GENERATOR USING TWO OSCILLATORS CONTROLLED BY A MULTIRESONATOR CRYSTAL
The unique properties of a monolithic crystal filter are turned to account in a low-frequency crystal oscillator system. Each of two different relatively high-frequency signals is generated by a...
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3591800 |
ATOMIC OR MOLECULAR BEAM RESONATOR HAVING FIELD CONCENTRATING MEANS FOR THE SECOND STATE SELECTOR
Disclosed herein is an atomic or molecular beam resonator having a source for producing the beam, a first and second state selector separated by an interaction zone, means for generating an...
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3584292 |
APPARATUS FOR OPTICALLY MONITORING THE GYROMAGNETIC RESONANCE OF QUANTUM SYSTEMS
There is disclosed improved magnetometer and frequency stabilizing apparatus which utilizes the principles of optical alignment and monitoring of quantum systems. Optical irradiation of said...
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3519949 |
OPTICAL PUMPING CELLS
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3513381 |
OFF-RESONANT LIGHT AS A PROBE OF OPTICALLY PUMPED ALKALI VAPORS
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3510758 |
ATOMIC RESONANCE GAS CELL HAVING AN EVACUATED DOUBLE END WALL STRUCTURE
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3495161 |
OPTICALLY DRIVEN ATOMIC RESONATOR SYSTEMS EMPLOYING MEANS FOR MODULATING THE SENSE OF ROTATIONAL POLARIZATION OF THE PUMPING LIGHT
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3450876 |
OVEN SOURCE FOR ATOMIC BEAM TUBES HAVING A NON-WETTABLY COATED GAS PASSAGEWAY BETWEEN THE RESERVOIR AND THE BEAM
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3435369 |
TUNING OF ATOMIC MASERS BY MAGNETIC QUENCHING USING TRANSVERSE MAGNETIC FIELDS
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3433944 |
DETECTOR FOR MOLECULAR OR ATOMIC BEAM APPARATUS
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3430131 |
SYSTEM FOR MONITORING THE PRESENCE OF NEUTRALS IN A STREAM OF IONS
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3418463 |
Atomic beam tube having multipole state selecting magnet means with shaped poles to inhibit majorana transitions
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3408591 |
Time scale changer for atomic stabilized frequency sources
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3407295 |
Elimination of frequency pulling due to zeeman resonance in thallium atomic beam tubes
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3406353 |
Automatic tuning of quantum resonance circuits
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3402358 |
Neutral particle beam accelerator having transverse electrodes and steering means for the particle beam
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3402362 |
Apparatus for generating a signal having a frequency equal to the average frequency of a plurality of frequency sources
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3397310 |
Atomic beam apparatus
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3388339 |
Atomic clocks with spin exchange collision
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3387130 |
Atomic beam tube having a source and an annular collimator
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3386049 |
Frequency correction circuit for an averaging frequency combiner
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3382452 |
Frequency stabilization apparatus
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3368160 |
Atomic frequency standard employing tandem second harmonic and fundamental phase sensitive detection for frequency lock
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3364438 |
Automatic search sweep for atomic frequency standard
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3363193 |
Adjustable frequency atomic frequency standard
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