Leland Stanford Junior University

Aosense, Inc.

Mark A Kasevich

Adam Bowman

Adam T Black

Matthew Todd Cashen

Thomas H Loftus

Brannon Klopfer

Steven Chu

Micah Ledbetter

Miroslav Y Shverdin

Michael R Matthews

Martin M Boyd

Thang Q Tran

Jason M Hogan

Christopher Jekeli

Stewart A Koppell

Marian Mankos

Miao Zhu

Brian R Patton

David M S Johnson

Todd Gustavson

Arman Cingoz

Ying-Ju Wang

Igor Teper

Thomas Juffmann

William D Weis

Susannah M Dickerson

Alex Sugarbaker

Sheng-wey Chiow

Boris Dubetsky

Matthew D Swallows

Chandra S Raman

Todd L Gustavson

A device comprises thermal atomic source(s), atom interference lasers, and additional laser beam(s). The thermal atomic source(s) provide atomic beam(s). The atom interference lasers are disposed to provide interrogation laser beams that interrogate the atomic beam(s) to assist in generating atom interference. The interrogation laser beams are configured so as to enable a first speed selectivity and/or angle selectivity of a set of atoms used in the atom interference by restricting the set of atoms. The additional laser beam(s) are configured in such a way that, combined with the speed and/or the angle selectivity of the atom interference lasers, achieve a second speed selectivity and/or angle selectivity of the set of atoms that contribute to a final detected interference signal by restricting the set of atoms to a second speed-angle phase space, where the first speed-angle phase space and the second speed-angle phase space intersect to enhance signal stability.

Phase-space filtering in thermal beam inertial sensors

An electron beam phase plate is provided where patterned radiation is provided to the phase plate to creates a corresponding electrical pattern, This electrical pattern provides a corresponding patterned modulation of the electron beam. Such modulation can be done in transmission or in reflection. This approach has numerous applications in electron microscopy, such as providing phase and/or amplitude shaping, aberration correction and providing phase contrast.

Optically-addressed phase modulator for electron beams

Improved resolution of a time-varying optical measurement is provided with optical intensity modulator(s) having a bandwidth greater than that of the detector array(s). The modulator configuration can have high photon collection efficiency, e.g. by using polarization modulation to split the incident light into several time-gated channels.

Nanosecond imaging methods using optical modulators

An inertial navigation system (INS) device includes three or more atomic interferometer inertial sensors, three or more atomic interferometer gravity gradiometers, and a processor. Three or more atomic interferometer inertial sensors obtain raw inertial measurements for three or more components of linear acceleration and three or more components of rotation. Three or more atomic interferometer gravity gradiometers obtain raw measurements for three or more components of the gravity gradient tensor. The processor is configured to determine position using the raw inertial measurements and the raw gravity gradient measurements.

Inertial navigation system design for precision mobile reference platforms

We provide a wide-field time-resolved imaging apparatus using resonant drive. We also identify ideal configurations of electro-optic (EO) modulator crystals for wide-field imaging. These techniques enable compact and low-cost LIDAR imaging devices. Resonant drive affords modulation of various EO modulators at high voltage by means of resonant voltage enhancement. Further, it enables operation of imaging modulators at high frequencies which would otherwise not be possible with conventional pulsed drivers&#x2014;this leads to improved LIDAR accuracy and dynamic range. Resonant drive uniquely enables Pockels cell LIDAR beyond normal flash mode by allowing for multiple pulses or multiple cycles of amplitude modulated illumination to be present simultaneously in a scene. This corresponds to illumination and modulation waveforms having a defined phase relationship where time-of-flight is encoded in the phase of the returning light waveform.

Wide-field resonant electro-optic imaging devices and applications

Improved resolution of a time-varying optical image is provided with a wide field optical intensity modulator having a bandwidth greater than that of the detector array(s). The modulator configuration can have high photon collection efficiency, e.g. by using polarization modulation to split the incident light into several timegated channels.

Wide-field nanosecond imaging methods using wide-field optical modulators

Improved aberration correction in multipass electron microscopy is provided by having Fourier images of the sample (instead of real images) at the reflection planes of the resonator. The resulting &#x2212;1 magnification of the sample reimaging can be compensated by appropriate sample placement or by adding compensating elements to the resonator. This enables simultaneous correction of lowest order chromatic and spherical aberration from the electron objective lenses. If real images of the sample are at the reflection planes of the resonator instead, only the lowest order chromatic aberration can be corrected.

Aberration reduction in multipass electron microscopy

An atomic oscillator device includes an atomic oscillator, a controlled oscillator, a resonance controller, and a cold-atom clock output. The atomic oscillator comprises a two-dimensional optical cooling region (2D OCR) for providing a source of atoms and a three-dimensional optical cooling region (3D OCR) for cooling and/or trapping the atoms emitted by the 2D OCR. The atomic oscillator comprises a microwave cavity surrounding the 3D OCR for exciting an atomic resonance. The controlled oscillator produces an output frequency. The resonance controller is for steering the output frequency of the controlled oscillator based on the output frequency and the atomic resonance as measured using an atomic resonance measurement. The cold-atom clock output is configured as being the output frequency of the controlled oscillator.

Architecture for compact cold atom clocks

A system for ion pumping including an anode, a cathode, and a magnet. The magnet comprises a Halbach magnet array.

Miniature ion pump

A system for an atomic interferometer includes a laser control system and a feedback control system. The laser control system controls a first pointing angle of a first interrogating laser beam. The first interrogating laser beam and a second interrogating laser beam interrogate a pair of almost counter-propagating laser cooled atomic ensembles. The feedback control system adjusts the first pointing angle based at least in part on an inertial measurement using the atomic interferometer to bias an output of the atomic interferometer to compensate for the effects of rotations. The pointing angle of the laser beam, which is linearly related to a frequency used to drive an acousto-optic deflector, is linearly related to the rotation rate of the sensor.

Automatic biasing and closed loop control of an atomic interferometer

A device for magnetic field generation includes a flux deliverer and a field shaper.

Magnetic field generators based on high magnetic permeability materials

An atomic gravimeter device includes one or more lasers and three or more atomic sources. The three or more atomic sources are disposed to launch or drop atoms vertically. The one or more lasers are disposed to generate laser beams that interact with sets of atoms from an atomic source of the three or more atomic sources to measure accelerations of the sets of atoms. A measured value is determined for gravity using interwoven acceleration measurements of the sets of atoms from the three or more atomic sources.

Zero dead-time gravimeter

A light pulse interferometer includes a first atom source and a first laser. The first atom source is configured to direct a first group of atoms in a first direction. The first laser is configured to generate one or more interferometer laser beam pairs. The one or more interferometer laser beam pairs interact with the first group of atoms in an interferometer sequence of three or more pulses to produce atom interference. A first laser beam pair of the one or more interferometer laser beam pairs is disposed to interact with the first group of atoms to perform 1D-cooling and velocity control of the first group of atoms prior to the interferometer sequence.

Light pulse atom interferometer velocity reference

A system for gravity measurement includes one or more atom sources, two or more laser beams, and a polarizing beamsplitter and a retro-reflection prism assembly. The one or more atom sources is to provide three ensembles of atoms. The two or more laser beams is to cool or interrogate the three ensembles of atoms. The polarizing beamsplitter and the retro-reflection prism assembly are in a racetrack configuration. The racetrack configuration routes the two or more laser beams in opposing directions around a loop topology, intersecting the three ensembles of atoms with appropriate polarizations chosen for cooling or interferometer interrogation. The three ensembles of atoms are positioned coaxially when interrogated.

Growing community of inventors

Palo Alto, CA, United States of America

Mark A Kasevich