Hi LLC

Aosense, Inc.

Innovusion, Inc.

Micah Ledbetter

Ethan Pratt

Jamu Alford

Hooman Mohseni

Dakota Blue Decker

Scott Jeremy Seidman

Benjamin Siepser

Jeffery Kang Gormley

Michael Henninger

Stephen Garber

Scott Michael Homan

Teague Lasser

Jerry Leung

Ricardo Jiménez-Martínez

Michael R Matthews

Geoffrey Iwata

Junwei Bao

Yimin Li

Rui Zhang

Mark A Kasevich

Brian R Patton

Adam T Black

Miroslav Y Shverdin

Matthew Todd Cashen

Benjamin Shapiro

Martin M Boyd

Argyrios Dellis

Kayla Wright-Freeman

Alexander F Sugarbaker

Daniel Sobek

Michael Romalis

Julian Kates-Harbeck

Ricardo Jiménez-Martinez

Igor Teper

Ying-Ju Wang

Akash Rakholia

A system for atom interferometry includes one or more lasers disposed to 1) generate a first pair of beams that are initially spatially separated and later overlapped to follow a common path to intersecting an atomic cloud interaction region, wherein the first beam of the pair of beams acts as a first MOT beam and the second beam of the pair of beams acts as a first Raman beam; and 2) generate an additional beam, wherein the additional beam is multiplexed to be used alternately as a second MOT beam and as a second Raman beam, wherein the additional beam follows an opposing path to the common path when intersecting the atomic cloud interaction region.

Laser architecture for component efficient atomic interferometer gravimeter

A magnetic field measurement system includes a light source that emits a light beam; an optical fiber to transmit the light beam; a variable optical attenuator to increase stability of an intensity of the light beam; a beam splitter to divide the light beam into an OPM light beam and a monitor light beam; a monitor detector to detect the monitor light beam and generate a monitor signal; a vapor cell with alkali metal atoms disposed therein and configured for transmission of the OPM light beam through the vapor cell; an OPM detector to detect the OPM light beam after transmission through the vapor cell and generate an OPM signal; and a group delay filter to combine the monitor signal and the OPM signal to generate a reduced noise OPM signal, where the group delay filter accounts for a phase difference between the monitor signal and the OPM signal.

Devices, systems, and methods for suppressing optical noise in optically pumped magnetometers

A magnetic field generator includes a plurality of conductive windings comprising a first conductive winding arranged in a first plane and a second conductive winding arranged in a second plane that is substantially parallel to the first plane. The plurality of conductive windings are configured to generate, when supplied with a drive current, a first component of a compensation magnetic field. The first component of the compensation magnetic field is configured to actively shield a magnetic field sensing region located between the first conductive winding and the second conductive winding from ambient background magnetic fields along a first axis that is substantially orthogonal to the first plane and the second plane.

Magnetic field generator for a magnetic field measurement system

An actuated magnetic field is generated at a plurality of distinct frequencies that at least partially cancels an outside magnetic field at the plurality of distinct frequencies, thereby yielding a total residual magnetic field. The total residual magnetic field is coarsely detected and a plurality of coarse error signals are respectively output. The total residual magnetic field is finely detected and a plurality of fine error signals are respectively output. The actuated magnetic field is controlled respectively at the plurality of distinct frequencies at least partially based on at least one of the plurality of coarse error signals, and finely controlled respectively at the plurality of distinct frequencies at least partially based on at least one of the plurality of fine error signals.

Nested and parallel feedback control loops for ultra-fine measurements of magnetic fields from the brain using a neural detection system

A light intensity modulator includes an input optical fiber; an output optical fiber; an optical arrangement having a lens, where the optical arrangement is configured to receive light from the input optical fiber, pass the light through the lens, and direct the light to the output optical fiber; and a piezoelectric device coupled to the lens, where the piezoelectric device is configured for moving the lens to alter overlap of the output optical fiber and the light directed to the output optical fiber to modulate intensity of light in the output optical fiber.

Devices, systems, and methods with a piezoelectric-driven light intensity modulator

A magnetocardiography (MCG) system includes a passively shielded enclosure having walls defining the passively shielded enclosure, each of the walls including passive magnetic shielding material to reduce an ambient background magnetic field within the passively shielded enclosure; an MCG measurement device including optically pumped magnetometers (OPMs); and active shield coils within the passively shielded enclosure and stationary relative to the passively shielded enclosure and the MCG measurement device, wherein the active shield coils are configured to further reduce the ambient background magnetic field within a user area of the passively shielded enclosure.

Systems and methods for recording biomagnetic fields of the human heart

A shielding arrangement for a magnetoencephalography (MEG) system includes a passively shielded enclosure having a plurality of walls defining the passively shielded enclosure, each of the plurality of walls including passive magnetic shielding material to reduce an ambient background magnetic field within the passively shielded enclosure; a vestibular wall extending from a first vertical wall to define, and at least partially separate, a vestibular area of the passively shielded enclosure adjacent the doorway and a user area of the passively shielded enclosure; and active shield coils distributed within the passively shielded enclosure and configured to further reduce the ambient background magnetic field within the user area of the passively shielded enclosure.

Systems and methods for recording neural activity

A method of operating an optically pumped magnetometer (OPM) includes directing a light beam through a vapor cell of the OPM including a vapor of atoms; applying RF excitation to cause spins of the atoms to precess; measuring a frequency of the precession; for each of a plurality of different axes relative to the vapor cell, directing a light beam through the vapor cell, applying a magnetic field through the vapor cell along the axis, applying RF excitation to cause spins of the atoms to precess, and measuring a frequency of the precession in the applied magnetic field; determining magnitude and components of an ambient background magnetic field along the axes using the measured frequencies; and applying a magnetic field based on the components around the vapor cell to counteract the ambient background magnetic field to facilitate operation of the OPM in a spin exchange relaxation free (SERF) mode.

Methods and systems for fast field zeroing for magnetoencephalography (MEG)

An exemplary controller may include a single clock source configured to generate a single clock signal used to drive one or more components within a plurality of magnetometers and a plurality of differential signal measurement circuits configured to measure current output by a photodetector of each of the plurality of magnetometers.

Systems and methods for measuring current output by a photodetector of a wearable sensor unit that includes one or more magnetometers

An exemplary wearable sensor unit includes 1) a magnetometer comprising a vapor cell comprising an input window and containing an alkali metal, and a light source configured to output light that passes through the input window and into the vapor cell along a transit path, and 2) a temperature control circuit external to the vapor cell and configured to create a temperature gradient within the vapor cell, the temperature gradient configured to concentrate the alkali metal within the vapor cell away from the transit path of the light.

Systems and methods for concentrating alkali metal within a vapor cell of a magnetometer away from a transit path of light

Embodiments discussed herein refer to using LiDAR systems that uses a rotating polygon with a multi-facet mirror. Such multi-facet galvanometer mirror arrangements generate a point map that has reduced curvature.

LiDAR systems that use a multi-facet mirror

LiDAR systems and methods that use a multi-facet mirror

A magnetic field measurement system includes a magnetometer having at least one vapor cell, at least one light source to direct at least two light beams through the vapor cell(s), and at least one detector; at least one magnetic field generator to modify an external magnetic field experienced by the vapor cell(s); and at least one processor configured for: applying a first modulation pattern, b(t), to the magnetic field generator(s) to modulate a magnetic field at the vapor cell(s), where b(t)=[ccos(&#x3c9;t)+ssin(&#x3c9;t), ccos(&#x3c9;t)+ssin(&#x3c9;t), ccos(&#x3c9;t)+ssin(&#x3c9;t)], where c, s, c, s, c, and sare amplitudes and &#x3c9; is a frequency; directing the light source(s) to direct the light beams through the vapor cell(s); receiving signals from the detector(s); and determining three orthogonal components of the external magnetic field using the received signals. Multi-frequency modulation patterns can alternatively be used.

Devices, systems, and methods with optical pumping magnetometers for three-axis magnetic field sensing

An exemplary magnetic field measurement system includes a wearable sensor unit that includes a magnetometer and a twisted pair cable interface assembly electrically connected to the magnetometer.

Interface configurations for a wearable sensor unit that includes one or more magnetometers

A magnetic field measurement system includes a wearable device having a plurality of wearable sensor units. Each wearable sensor unit includes a plurality of magnetometers and a magnetic field generator configured to generate a compensation magnetic field configured to actively shield the plurality magnetometers from ambient background magnetic fields. A strength of a fringe magnetic field generated by the magnetic field generator of each of the wearable sensor units is less than a predetermined value at the plurality of magnetometers of each wearable sensor unit included in the plurality of wearable sensor units.

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Sunnyvale, CA, United States of America

Micah Ledbetter