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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...
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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...
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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)...
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8121569 |
Frequency generation techniques
Techniques involving the generation of signals at particular frequencies are disclosed. For instance, an apparatus may include an oscillator module, a synthesizer module, and a control module. The...
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8106717 |
Quantum gate method and apparatus
A method includes causing a common-resonator mode resonating with a transition between |2>i and |3>i that are coupled to each other by a transition having a homogenous broadening ΔEhomo greater ...
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8098105 |
Spin-valve or tunnel-junction radio-frequency oscillator
This radio-frequency oscillator includes a magnetoresistive device in which an electric current is able to flow. The magnetoresistive device includes a first magnetic layer, known as a “trapped l...
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8067991 |
Chip-scale atomic clock with two thermal zones
A chip-scale atomic clock comprises a physics package and a laser die located in a first thermal zone of the physics package. A quarter wave plate is mounted in the physics package and is in...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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7859349 |
Fully integrated tuneable spin torque device for generating an oscillating signal and method for tuning such apparatus
The present invention is related to a device and corresponding methods for generating an oscillating signal. The device comprises a means for providing a current of spin polarised charge carriers,...
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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...
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7795984 |
Magnetic oscillator with multiple coherent phase output
Apparatus to generate signals with multiple phases are described. The apparatus includes a fixed multilayer stack providing a varying magnetic field and at least two sensors adjacent the fixed...
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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...
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7764136 |
Microwave transmission line integrated microwave generating element and microwave transmission line integrated microwave detecting element
A strip line integrated microwave generating element and a microwave detecting element comprises a signal electrode and a ground electrode. The element has a magnetic tunnel junction structure...
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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...
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7666485 |
Alkali metal-wax micropackets for alkali metal handling
A method of making alkali-metal vapor cells by first forming microscale-wax micropackets with alkali metals inside allows fabrication of vapor cells at low cost and in a batch fabricated manner....
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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...
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7652473 |
Magnetic field measuring optically pumped magnetometer apparatus
Providing: quickly brining a vapor cell 119 to a desired temperature when retaining the heat of the vapor cell 119 to enhance the magnetic field detection performance of an optically pumped...
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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...
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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...
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7589600 |
Spin oscillator device
A spin oscillator device generates a microwave output in response to an applied DC current. The device includes a spin momentum transfer (SMT) stack including a top electrode, a free layer, a...
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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...
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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...
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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...
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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...
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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 resonant...
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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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