Class / Patent application number | Description | Number of patent applications / Date published |
324304000 | Using optical pumping or sensing device | 58 |
20090009165 | QUANTUM INFORMATION PROCESSING DEVICE AND METHOD - Quantum information processing device includes resonator incorporating material containing physical systems, each of physical systems having at least four energy states, transition between two energy states of at least four energy states, and transition energy between at least two energy states of at least four energy states, at least four energy states being non-degenerate when magnetic field fails to be applied to physical systems, transition resonating in resonator mode that is in common between physical systems, each of at least four energy states representing a quantum bit, transition energy being shifted when magnetic field is applied to physical systems, and magnetic-field application unit configured to apply magnetic field having direction and intensity to material, to eliminate linear transition energy shift between two energy states included in physical systems, each of two energy states included in physical systems being with excluding two energy states resonating in resonator mode. | 01-08-2009 |
20090039881 | COMPACT ATOMIC MAGNETOMETER AND GYROSCOPE BASED ON A DIVERGING LASER BEAM - An atomic magnetometer that simultaneously achieves high sensitivity, simple fabrication and small size. This design is based on a diverging (or converging) beam of light that passes through an alkali atom vapor cell and that contains a distribution of beam propagation vectors. The existence of more than one propagation direction permits longitudinal optical pumping of atomic system and simultaneous detection of the transverse atomic polarization. The design could be implemented with a micro machined alkali vapor cell and light from a single semiconductor laser. A small modification to the cell contents and excitation geometry allows for use as a gyroscope. | 02-12-2009 |
20090261822 | Hyperpolarization of lithium and other nuclei - The invention concerns a method for hyperpolarizing lithium atoms in a mixture by optically pumping, in a sampling cell, atoms of a first type or alkali metal and by spin exchange between the optically pumped electron of the alkali metal and the lithium atom electron. The lithium atoms are preferably oxidized into Li | 10-22-2009 |
20090289629 | Method and Apparatus for Implementing EIT Magnetometry - A magnetometer is provided comprising an atomic vapor in an enclosure, a source of light for preparing the vapor into a state exhibiting electromagnetically induced transparency, a first laser beam passing through the atomic vapor, a phase detector for detecting changes in phase of the first laser beam, and a controller which controls the light source and laser beam and receives the information detected by the phase detector in order to compute from those changes in phase a magnetic field strength in the presence of a selected background magnetic field of at least 0.001 T. Operation in the presence of a background field helps make this magnetometer suitable for diagnostic imaging applications. | 11-26-2009 |
20100007345 | Polarization analyzer orientation - An apparatus in one example comprises a polarization filter and a polarization analyzer. The polarization filter comprises a first polarization axis. The polarization analyzer comprises a second polarization axis. The polarization filter is configured to polarize detection light for a nuclear magnetic resonance (NMR) cell along the first polarization axis. The polarization analyzer is configured to receive the detection light from the NMR cell and pass a portion of the detection light to a processor for determination of angular rate information. The portion of the detection light passed to the processor is based on an orientation of the second polarization axis relative to the first polarization axis. The orientation is selected to maximize a signal-to-noise ratio of the detection light. | 01-14-2010 |
20100188081 | Method and Device for Measuring Magnetic Fields - The invention relates to a method which makes use of the Zeeman effect for measuring magnetic fields, by way of dark resonances. According to said method, a measuring cell ( | 07-29-2010 |
20100289491 | RADIO FREQUENCY ATOMIC MAGNETOMETER - An atomic magnetometer is used to detect radio frequency magnetic fields, such as those generated in nuclear resonance experiments. The magnetometer is based on nonlinear magneto-optical rotation and pumps an atomic vapor into a quadrupole aligned state. Detection of the modulation of the polarization of a linearly polarized beam provides the radio frequency signal, which can then be processed to extract the component frequencies. | 11-18-2010 |
20100301853 | POLARIZING NUCLEI IN SOLIDS VIA SPIN TRANSFER FROM AN OPTICALLY-PUMPED ALKALI VAPOR - The present invention relates to a method and system for polarizing a solid compound of interest via spin transfer from an optically-pumped alkali vapor. In one embodiment, the method provides a cell which contains a solid compound as well as pure alkali metal and some amount of buffer gas. The cell is heated to vaporize some of the pure alkali. Resonant laser light is passed through the cell to polarize the atomic vapor, a process known as “optical pumping.” Optical pumping can transfer order from photons to atoms, causing a buildup of vapor atoms in one angular momentum state. This vapor polarization is then transferred through the surface of the solid compound in order to polarize the nuclei in the bulk of the compound. This can produce nuclear polarizations in the sample many times larger than the limit set by thermal equilibrium. The method can be used in nuclear magnetic resonance (NMR) or magnetic resonance imaging (MRI). | 12-02-2010 |
20100327866 | NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY USING LIGHT WITH ORBITAL ANGULAR MOMEMTUM - The present invention relates to a device capable of producing a high resolution chemical analysis of a sample, such as fluid, based upon nuclear magnetic resonance (NMR) spectroscopy, where the nuclear magnetic polarizations of the sample are generated by sequentially illuminating the sample with a focused beam of light carrying angular orbital angular momentum (OAM) and possibly momentum (spin). Unlike in usual NMR used for magnetic nuclear resonance imaging (MRI) or spectroscopy, the invention does not make use of a strong magnet. | 12-30-2010 |
20110025323 | OPTICAL ATOMIC MAGNETOMETER - An optical atomic magnetometers is provided operating on the principles of nonlinear magneto-optical rotation. An atomic vapor is optically pumped using linearly polarized modulated light. The vapor is then probed using a non-modulated linearly polarized light beam. The resulting modulation in polarization angle of the probe light is detected and used in a feedback loop to induce self-oscillation at the resonant frequency. | 02-03-2011 |
20110031969 | ATOMIC MAGNETOMETER AND METHOD OF SENSING MAGNETIC FIELDS - A magnetometer and method of use is presently disclosed. The magnetometer has at least one sensor void of extraneous metallic components, electrical contacts and electrically conducting pathways. The sensor contains an active material vapor, such as an alkali vapor, that alters at least one measurable parameter of light passing therethrough, when in a magnetic field. The sensor may have an absorptive material configured to absorb laser light and thereby activate or heat the active material vapor. | 02-10-2011 |
20110193559 | ELECTRON SPIN MEASUREMENT DEVICE AND MEASUREMENT METHOD - An electron spin measuring device of the organic thin film element is provided with: at least one sample tube into which a sample for measurement is inserted and which is sealed together with specific gas or with vacuum; a cavity into which the at least one sample tube is inserted; an electric characteristic measuring device for the characteristic evaluation of the organic thin film element which is the sample; connected wiring for interconnecting the electrical characteristic measuring device and the sample for measurement in the sample tube; and a light receiving/emitting device for performing the light irradiation to the sample for measurement, and/or performing the detection of the light emission from the organic thin film element, wherein the cavity resonator irradiates microwaves having the number of vibration corresponding to the Zeeman energy splitting of the unpaired electron, sweeps a magnetic field to the sample tube, and measures the transition between the energy levels caused by the reversal of the direction of the electron spin. | 08-11-2011 |
20120146635 | METHOD FOR EXAMINING THE NUCLEAR MAGNETIC RESONANCE IN A SAMPLE AND DEVICE FOR CARRYING OUT THE METHOD - Nuclear magnetic resonance in a sample volume located in a measuring volume is examined by generating a packet of laser pulses to act on the measuring volume when a quasi-static magnetic field occurs therein. If the resonance conditions for nuclear spins contained therein are fulfilled, the sample volume emits a response signal that is received by a detector. The quasi-static magnetic field occurring within the measuring volume is generated by acting on the measuring volume with a low-frequency laser beam having a wavelength that exceeds the wavelength of the excitation laser by at least 10 | 06-14-2012 |
20120319684 | MODULAR ARRAY OF FIXED-COUPLING QUANTUM SYSTEMS FOR QUANTUM INFORMATION PROCESSING - A quantum information processing system includes a first composite quantum system, a second composite quantum system, a plurality of electromagnetic field sources coupled to the system and an adjustable electromagnetic coupling between the first composite quantum system and the second composite quantum system. | 12-20-2012 |
20130214780 | QUANTUM MECHANICAL MEASUREMENT DEVICE - A quantum mechanical measurement device is provided. A spin ensemble is provided. A first light source provides a first light at a first wavelength, wherein the first light source is positioned to provide light into the spin ensemble. A detector is positioned to detect light from the spin ensemble. A modulator modulates absorption of the first light from the first light source by the spin ensemble at a frequency greater than a Larmor frequency of the spin ensemble. | 08-22-2013 |
20130221960 | MAGNETIC SENSOR FOR MEASURING A MAGNETIC FIELD USING OPTICAL PUMPING METHOD - A magnetic sensor is provided that measures a magnetic field. The sensor includes a first gas, a probe light source which causes first circular polarized light to be incident on the first gas, a second gas arranged on an optical path of a second circular polarized light, an AC magnetic field generator which generates an AC magnetic field and generates magnetic resonance, a bias magnetic field generator which generates bias magnetic fields with different intensities for the first gas and the second gas and differentiates the optical transmittance of the first circular polarized light in the first gas from the optical transmittance of the second circular polarized light in the second gas, and a detector which detects a light amount of the first circular polarized light and a third circular polarized light. | 08-29-2013 |
20130278253 | OPTICALLY PUMPED MAGNETOMETER - There is provided an optically pumped magnetometer, in which a pump light having a first wavelength to spin-polarize a first alkali-metal atom group is made to enter a cell containing the first alkali-metal atom group and a second alkali-metal atom group interacting via spin exchange with the first alkali-metal atom group, a probe light having a second wavelength different from the first wavelength to measure spin polarization of the second alkali-metal atom group is made to enter the cell to form the same optical axis as the pump light, a wavelength discrimination unit is provided to discriminate between the pump light and the probe light that passed through the cell depending on a different in wavelength, and the rotation angle of a polarization plane of the probe light that passed through the cell is measured so that the degree of flexibility of the device layout can be increased. | 10-24-2013 |
20130328557 | NUCLEAR MAGNETIC RESONANCE PROBE SYSTEM - One embodiment includes a nuclear magnetic resonance (NMR) sensor system. The system includes a pump laser configured to generate an optical pump beam at a first wavelength and a probe laser configured to generate an optical probe beam at a second wavelength that is different from the first wavelength. The system also includes beam optics configured to direct the pump laser and the probe laser along orthogonal axes through a sensor cell comprising an alkali metal vapor. The system further includes detection optics that include a photodetector assembly configured to measure at least one characteristic associated with the optical probe beam leaving the sensor cell for measurement of a polarization vector of the alkali metal vapor. The detection optics can include at least one filter configured to filter light having the first wavelength and to pass light having the second wavelength to the photodetector assembly. | 12-12-2013 |
20140097837 | OPTICALLY PUMPED MAGNETOMETER, MAGNETOENCEPHALOGRAPHY METER, AND MRI DEVICE - An optical pumping magnetometer measures a magnetic field of a measurement object using optical pumping. The optical pumping magnetometer includes a nonmagnetic cell in which at least an alkali metal is enclosed and which has optical transparency and heat resistance, a laser beam irradiation unit which radiates a laser beam to the cell and optically pumps at least the alkali metal, a detecting unit which receives a transmission laser beam transmitted through the cell and detects a detection signal related to the magnetic field, and a high frequency voltage applying unit which applies a high frequency voltage to a pair of application units provided on the cell and heats the cell by dielectric heating. | 04-10-2014 |
20140197831 | Absorbtion-Based Detection Of Spin Impurities In Solid-State Spin Systems - Absorption based detection of spin states of spin impurities within a solid-state spin system, such as NV centers in diamond, is implemented by measuring the absorption intensity of an optical signal applied to the spin impurities, i.e. change in intensity of the optical signal after the signal has been transmitted through the solid-state spin system. During optical excitation of the spin impurities, microwave pulses are applied to the sample at a frequency tuned to the ESR frequency. The relative populations of the spin states of the impurities, which provides information regarding variables of interest such as an external magnetic field or a quantum information protocol, is determined from the ratio of the absorption intensity of the optical signal when the microwave pulses are turned on, to the absorption intensity of the optical signal when the microwave pulses turned off. | 07-17-2014 |
20140247045 | SYSTEM AND METHOD FOR ATOM-MODULATED, LOW-DRIFT SENSOR - A compact, high-sensitivity magnetometer, including: an optical interface to accept a linearly polarized first light; a pump light source to produce a circularly polarized pump light; a vapor cell comprising a sealed vessel containing an alkali-metal gas, a first input port to receive the first light, a second input port to accept the pump light from a direction perpendicular to the first light, and an output port configured to produce a second light; an electromagnetic source configured to apply an electromagnetic field to the vapor cell at a direction perpendicular to the first light and the pump light; a second linear polarizer, having an axis of polarization perpendicular to the first light, the second polarizer configured to receive the second light and to produce a third light; and a photodetector configured to receive the third light, to produce an intensity measurement of the third light. | 09-04-2014 |
20140327439 | STABLE THREE-AXIS NUCLEAR SPIN GYROSCOPE - An n-NV-based gyroscope is provided that includes a diamond structure implanted with a plurality of NV centers, whose nuclear spins form a spin gyroscope. A number of radio-frequency (rf) coils and microwave (μw) co-planar waveguides are fabricated on the diamond structure to provide a sensitive and stable three-axis gyroscope in the solid state while achieving gyroscopic sensitivity by exploiting the coherence time of the | 11-06-2014 |
20140361768 | CHIP-SCALE ATOMIC GYROSCOPE - Apparatuses and methods for sensing rotations are provided. One embodiment of the apparatus includes a cell containing alkali and active nuclear magnetic resonance (NMR) isotope(s) atoms, a magnet providing a first magnetic field, a light source, and optics which circularly polarize light to generate a pump beam for optically pumping the alkali atoms and, together with a second magnetic field orthogonal to the first magnetic field or a modulation of the light, causing the alkali and the NMR isotope atoms to precess about the first magnetic field. The apparatus further includes a partial reflector opposite the light source and configured to, in conjunction with a first linear polarizer, generate a reflected linearly-polarized probe beam from a portion of the pump beam, and one or more polarizing beam splitters configured to split light of the probe beam incident thereon into orthogonally polarized components that are detected and used to determine rotations. | 12-11-2014 |
20140368193 | ISOTROPIC AND INTEGRATED OPTICAL PUMPING MAGNETOMETER - A magnetic resonance optical pumping isotropic magnetometer including a laser, a gas filled cell, a HF discharge circuit, RF magnetic field generating coils surrounding the cell, a first frequency regulating mechanism of an RF generator, a second polarization regulating mechanism of the laser beam, and a third regulating mechanism of the direction of the RF magnetic field. The direction of polarization of the laser beam at an inlet of the cell is orthogonally aligned with the magnetic field to be measured by virtue of a liquid crystal polarization rotator. The magnetometer is well-adapted to an integrated arrangement. | 12-18-2014 |
20150008916 | METHOD AND DEVICE FOR MEASURING A MAGNETIC FIELD BY SYNCHRONISED EXCITATIONS - The invention relates to a magnetic field measurement device, including a detector ( | 01-08-2015 |
20150015251 | ATOM BEAM GYROSCOPE - One embodiment of the invention includes an atom beam gyroscope system. The system includes an atom beam system that generates an atom beam comprising alkali metal atoms along a length of a detection region orthogonal to a sensitive axis. The system also includes a detection system comprising a detection laser and photodetector. The detection laser can generate an optical detection beam that illuminates the detection region to pump the alkali metal atoms. The photodetector can measure an optical absorption of the optical detection beam by the alkali metal atoms in the atom beam and to generate an intensity signal associated with the measured optical absorption. The system further includes a gyroscope sensor configured to calculate rotation of the atom beam gyroscope system about the sensitive axis based on a magnitude of the intensity signal due to a Doppler-shift in energy of the alkali metal atoms in the atom beam. | 01-15-2015 |
20150022200 | OPTICALLY PUMPED MAGNETOMETER AND OPTICAL PUMPING MAGNETIC FORCE MEASURING METHOD - An optically pumped magnetometer having a single optical axis using atomic electron spin or nuclear spin includes a detection unit configured to detect an angle of a polarization plane of probe light having components of linear polarization and a modulation unit configured to apply a modulation to the angle of the polarization plane of the probe light having the components of linear polarization. The modulation unit is configured to control an offset in applying the modulation to the angle of the polarization plane of the probe light having the components of linear polarization according to the angle of the polarization plane of the probe light detected by the detection unit. | 01-22-2015 |
20150130457 | MAGNETIC FIELD MEASUREMENT APPARATUS, MAGNETIC FIELD MEASUREMENT SYSTEM AND MAGNETIC FIELD MEASUREMENT METHOD - A magnetic field measurement apparatus includes a first gas cell disposed in a +z direction when seen from an object to be measured, a second gas cell disposed in the +z direction when seen from the first gas cell, a first measurement unit which measures a component of a magnetic field in the first gas cell, a second measurement unit which measures a component of a magnetic field in the second gas cell, a magnetic field generation unit which generates the magnetic field toward the second gas cell so as to reduce the component measured by the second measurement unit, and an output unit which outputs a signal in response to the difference in the components respectively measured by the first measurement unit and second measurement unit. | 05-14-2015 |
20150316598 | OPTICAL ADDRESSING OF INDIVIDUAL TARGETS IN SOLIDS - This disclosure concerns photonics and in particular the addressing of individual targets in solids. In aspect one there is provided a device comprising a solid substrate with one or more atomic scale targets in the substrate. A laser light is focused on a region of the substrate that contains a single target to selectively cause photoionization of the target. A charge sensor with sub-electron charge sensitivity is focussed on measuring the charge in the region of the substrate that contains a single target. In use, the device operates such that the laser is turned on to cause photoionization of the target, and the charge sensor detects the change in charge in the region of the substrate that contains the single target. In another aspect is the method for optically investigating individual nuclear spin states of single atoms by investigating both the Zeeman effect and the hyperfine interaction of the single atoms. | 11-05-2015 |
20150316625 | MAGNETIC FIELD TRIMMING IN AN ATOMIC SENSOR SYSTEM - One example embodiment includes an atomic sensor system. The system includes a magnetic field generator configured to generate a magnetic field in a volume. The system also includes a vapor cell arranged within the volume and comprising a polarized alkali metal vapor. The system further includes at least one magnetic field trimming system configured to generate a magnetic field gradient within the vapor cell separate from the magnetic field to provide a substantially uniform collective magnetic field within the vapor cell. | 11-05-2015 |
20150369604 | CHIP-SCALE ATOMIC GYROSCOPE - Apparatuses and methods for sensing rotations are provided. One embodiment provides an apparatus including a cell containing alkali and active nuclear magnetic resonance (NMR) isotope(s) atoms, a magnet providing a first magnetic field, a light source emitting diverging light that passes through the cell, and optics which circularly polarize the diverging light. A longitudinal component of the diverging light optically pumps the alkali atoms and, in conjunction with a second magnetic field orthogonal to the first magnetic field or a modulation of the diverging light, causes the alkali and NMR isotope atoms to precess about the first field. A transverse component of the diverging light acts as a probe beam for observing the precession. The apparatus further includes a polarizing beam splitter to split light that has passed through the cell into orthogonally polarized components detected by respective photodetectors and used to determine rotations relative to an inertial frame. | 12-24-2015 |
20150377989 | DEVICE AND METHODOLOGY FOR MEASURING MINUTE CHANGES IN AMBIENT MAGNETIC FIELD - An optical magnetometer comprising: a response frequency measurement unit comprising a vapor cell, a pulsed-mode pump laser and a probe laser; and a computing unit configured to compute a magnetic field change based on a difference between at least two temporally-distinct response frequency values received from the frequency measurement unit. Optionally, the response frequency measurement unit is magnetically non-shielded. | 12-31-2015 |
20160010995 | PHYSICAL UNIT OF CHIP-SCALE NMR GYROSCOPE | 01-14-2016 |
20160061914 | METHOD FOR THE HYPERPOLARISATION OF NUCLEAR SPIN IN A DIAMOND VIA A LONG-RANGE INTERACTION - The invention concerns a method for the hyperpolarisation of | 03-03-2016 |
20160071532 | MAGNETIC WRITE HEAD CHARACTERIZATION WITH NANO-METER RESOLUTION USING NITROGEN VACANCY COLOR CENTERS - A crystal film with one or more nitrogen vacancy centers is placed in close proximity to a recording head. A magnetic field or heat produced by the recording head as well as excitation illumination and an excitation field is applied to the crystal film. The magnetic field produced by the recording head, the heat produced by a thermal device on the recording head, and/or the excitation field may be varied. A confocal microscope or wide-field microscope optically detects a decrease in a spin dependent photoluminescence in response to the magnetic field or heat, excitation field and excitation illumination caused by electron spin resonance (ESR) of the at least one nitrogen vacancy center to measure Optically Detected Spin Resonance (ODMR). A characteristic of the recording head is determined using the ODMR. | 03-10-2016 |
20160077167 | INTEGRATED OPTICAL NANOSCALE PROBE - A diamond probe is suitable to be attached to an Atomic Force Microscope and is created with a tip that incorporates a one or more Nitrogen Vacancy (NV) centers located near the end of the tip. The probe arm acts as an optical waveguide to propagate the emission from the NV center with high efficiency and a beveled end directs excitation light to the NV center and directs photoluminescence light emanating from the NV center into the probe arm. The light source (or a portion of the light source), a detector, as well as an RF antenna, if used, may be mounted to the probe arm. The probe with integrated components enable excitation of photoluminescence in the NV center as well as optically detected Electron Spin Resonance (ODMR) and temperature measurements, and may further serve as a light probe utilizing the physical effect of Stimulated Emission Depletion (STED). | 03-17-2016 |
20160139216 | MAGNETIC FIELD MEASUREMENT APPARATUS - A magnetic field measurement apparatus includes an irradiation portion, a gas cell, a measurement unit (polarization separation unit, light receiving portion, signal processing circuit), and a magnetic shield. The magnetic shield is formed in a elongated hollow shape having openings at both sides thereof. The gas cell, in which gaseous atoms are sealed, is disposed in a hollow area of the magnetic shield. The irradiation portion irradiates irradiation light including linearly polarized light adjusted so that the vibration direction of an electric field coincides with the axis direction of the magnetic shield onto the gaseous atoms sealed in the gas cell along a direction perpendicular to the axis of the magnetic shield. The measurement unit measures a rotational angle of a polarization plane of the irradiation light that has been irradiated by the irradiation portion and passed through the gaseous atoms. | 05-19-2016 |
20160146909 | MAGNETIC FIELD MEASUREMENT DEVICE - A magnetic measurement device has a magnetic sensor including a glass cell having alkali metal gas encapsulated therein that is configured to detect a magnetic field using a magneto-optical characteristic of spin-polarized alkali metal. A laser light source is configured to generate pump light introduced into the magnetic sensor and a coil provided in the same magnetically shielded space as the magnetic sensor is configured to apply a static magnetic field and a RF magnetic field to the magnetic sensor. A signal processor is configured to perform lock-in detection of a light detection signal transmitted through the glass cell of the magnetic sensor, control an intensity of the static magnetic field and a frequency of the RF magnetic field generated by the coil according to a lock-in detection output, and obtain a measurement signal reflecting a magnetic field intensity of an object to be measured in the magnetically shielded space. | 05-26-2016 |
20160154072 | MAGNETIC FIELD MEASUREMENT METHOD AND MAGNETIC FIELD MEASUREMENT APPARATUS | 06-02-2016 |
20160154073 | MAGNETIC FIELD MEASUREMENT METHOD AND MAGNETIC FIELD MEASUREMENT APPARATUS | 06-02-2016 |
20160161429 | SYSTEMS AND METHODS FOR DETERMINISTIC EMITTER SWITCH MICROSCOPY - Techniques for deterministic switch microscopy include resolving at least one nitrogen vacancy center in a diamond structure. A magnetic field can be applied across the diamond structure and the nitrogen vacancy centers can be optically excited. The nitrogen vacancy centers can be switched from a dark state to a bright state or a bright state by a dark state by applying at least one microwave pulse. A fluorescent response of each nitrogen vacancy center can be detected and a nitrogen vacancy center can be resolved based on the fluorescent response of each nitrogen vacancy center as it corresponds to the orientation of the nitrogen vacancy center relative to the applied magnetic field. | 06-09-2016 |
20160202062 | RATIOMETRIC NUCLEAR MAGNETIC RESONANCE (NMR) GYROSCOPE SYSTEM | 07-14-2016 |
20160202083 | SELF-CALIBRATING NUCLEAR MAGNETIC RESONANCE (NMR) GYROSCOPE SYSTEM | 07-14-2016 |
20170234941 | MAGNETOMETER | 08-17-2017 |
20190145919 | METHODS AND APPARATUS FOR OPTICALLY DETECTING MAGNETIC RESONANCE | 05-16-2019 |
20190146045 | METHOD AND APPARATUS FOR MEASURING MAGNETIC FIELD STRENGTH | 05-16-2019 |
20220137162 | SYSTEM AND METHOD FOR FEMTOTESLA DIRECT MAGNETIC GRADIOMETER USING A MULTIPASS CELL - According to various embodiments, a direct magnetic gradiometer having intrinsic subtraction of rotation signals from two oppositely polarized atomic ensembles within a single multi-pass cell is disclosed. The gradiometer includes three convex spherical mirrors aligned in a V-shape geometry. The three convex spherical mirrors include a front mirror and two back mirrors. The gradiometer further includes a probe laser beam. The laser beam is configured to be initially focused at a near-zero angle into a hole at a center of the front mirror such that the laser beam expands at the back mirrors and nearly overlaps with itself while undergoing multiple reflections between the front and back mirrors. The laser beam is further configured to be refocused to the front mirror at different spots in a number equal to half of total beam passes before exiting. | 05-05-2022 |
324305000 | Having particular optical cell structure | 11 |
20090256561 | INTEGRATED MICROCHIP INCORPORATING ATOMIC MAGNETOMETER AND MICROFLUIDIC CHANNEL FOR NMR AND MRI - An integral microfluidic device includes an alkali vapor cell and microfluidic channel, which can be used to detect magnetism for nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). Small magnetic fields in the vicinity of the vapor cell can be measured by optically polarizing and probing the spin precession in the small magnetic field. This can then be used to detect the magnetic field of in encoded analyte in the adjacent microfluidic channel. The magnetism in the microfluidic channel can be modulated by applying an appropriate series of radio or audio frequency pulses upstream from the microfluidic chip (the remote detection modality) to yield a sensitive means of detecting NMR and MRI. | 10-15-2009 |
20100123459 | Small optics cell for miniature nuclear magnetic resonance gyroscope - A beamsplitter is arranged to split an incident laser beam into a pump beam and a detection beam. The pump beam passes through the beam splitter and then reflects from a pair of mirrors to a quarter waveplate into an NMR cell. After passing through the NMR cell, the pump beam reflects from a mirror to a first photodetector. The detection beam reflects from the beam splitter and propagates on a path perpendicular to the path of the pump beam through the NMR cell. After passing through the NMR cell, the detection beam is incident upon a polarizer. The polarized portion of the detection beam then is incident upon a photodetector. Electrical signals output from the first and second photodetectors may then be processed to determine the rotation rate of the NMR cell about a sensing axis. | 05-20-2010 |
20140184216 | SYSTEMS AND METHOD TO SUBSTANTIALLY MITIGATE AC STARK SHIFT EFFECTS IN A SENSOR SYSTEM - One embodiment includes a sensor system. The system includes a cell system comprising a pump laser configured to generate a pump beam to polarize alkali metal particles enclosed within a sensor cell. The system also includes a detection system comprising a probe laser configured to generate a probe beam. The detection system can also be configured to calculate at least one measurable parameter based on characteristics of the probe beam passing through the sensor cell resulting from precession of the polarized alkali metal particles in response to an applied magnetic field. The system further includes an AC Stark shift control system configured to frequency-modulate the pump beam and to control a center frequency of a frequency-modulated pump beam based on the characteristics of the probe beam passing through the sensor cell to substantially stabilize and mitigate the effects of AC Stark shift on the at least one measurable parameter. | 07-03-2014 |
20150054504 | OPTICALLY PUMPED MAGNETOMETER AND METHOD OF MEASURING MAGNETIC FORCE - An optically pumped magnetometer includes: a modulation unit which allows rectangular wave modulation to an angle of a polarization plane of probe light; a detector for detecting a change of the angle of the polarization plane of the probe light transmitted through a cell; and a differential circuit for obtaining a difference in light intensity between components separated by a polarization splitter. Thus, both a reduction of a light intensity noise of the probe light and a separation and reduction of a noise defined by an inverse of a frequency in a low frequency area can be achieved. | 02-26-2015 |
20150338476 | ATOMIC OSCILLATOR, METHOD OF DETECTING COHERENT POPULATION TRAPPING RESONANCE AND MAGNETIC SENSOR - An atomic oscillator includes an alkali metal cell encapsulating an alkali metal atom; a light source that emits laser light; a light detector that detects light which has passed through the alkali metal cell; and a polarizer arranged between the alkali metal cell and the light detector. A modulation frequency in the light source is controlled, according to a coherent population trapping resonance which is a light absorption characteristic of a quantum interference effect for two kinds of resonant lights, by modulating the light source to generate sidebands and injecting laser lights with the sidebands into the alkali metal cell. A magnetic field is applied on the alkali metal cell in a direction parallel to a propagating direction of the laser light, and the laser light entering the alkali metal cell has a linear polarization, which is not parallel to a polarization direction of the polarizer. | 11-26-2015 |
20150346293 | OPTICAL PROBE BEAM STABILIZATION IN AN ATOMIC SENSOR SYSTEM - One example embodiment includes an atomic sensor system. A probe laser generates a probe beam. A first portion of the probe beam is provided through a sensor cell comprising a first alkali vapor to calculate a measurable parameter of the system based on a first detection beam corresponding to the first portion of the probe beam exiting the sensor cell. A second portion of the probe beam can be provided through a stabilization cell that comprises a second vapor. A detection system can be configured to stabilize the frequency of the probe beam in a manner that is on-resonance with respect to an optical transition wavelength of the second alkali vapor and off-resonance with respect to an optical transition wavelength of the first alkali vapor based on a second detection beam corresponding to the second portion of the probe beam exiting the stabilization cell. | 12-03-2015 |
20160061913 | OPTICALLY PUMPED ATOMIC MAGNETOMETER AND MAGNETIC SENSING METHOD - Provided is an optically pumped atomic magnetometer that can separate and acquire magnetic information of spatially different places at the same time by one probe beam. The optically pumped atomic magnetometer includes a cell containing alkali metal atoms, a pump beam optical system introducing pump beams including circularly polarized light component to different locations of the cell, a probe beam optical system introducing a probe beam including linearly polarized light component to the cell, a detection unit detecting a signal reflecting a rotation angle of a plane of polarization of the probe beam after intersecting with the pump beams, and an information acquisition unit acquiring information related to a magnetic field intensity of each of the different locations from the detected signal. The pump beam optical system includes a modulation unit modulating the pump beams so that one of frequencies and phases of the pump beams is different. | 03-03-2016 |
20160109538 | MAGNETISM MEASUREMENT APPARATUS, GAS CELL, METHOD FOR MANUFACTURING MAGNETISM MEASUREMENT APPARATUS, AND METHOD FOR MANUFACTURING GAS CELL - A magnetism measurement apparatus that measures a magnetic field includes a gas cell including a primary chamber, a reservoir, and a exhaust hole that allows the primary chamber and the reservoir to communicate with each other. The primary chamber and the reservoir are filled with an alkali metal gas, and at least one of an alkali metal solid and an alkali metal liquid is placed in the reservoir. | 04-21-2016 |
20160116553 | ATOMIC MAGNETOMETER AND OPERATING METHOD OF THE SAME - Provided are an atomic magnetometer and an operating method of the same. The atomic magnetometer includes a vapor cell receiving a circularly polarized pump beam and a linearly polarized probe beam and containing an alkali metal vapor, a detector adapted to receive the probe beam passing through the vapor cell to measure magneto-optical rotation of the probe beam, a feedback coil to establish a negative feedback magnetic field signal orthogonal to a first plane defined by traveling directions of the probe beam and the pump beam and provide the negative feedback magnetic field signal to the vapor cell, and a feedback amplifier adapted to provide feedback current to the feedback coil such that the negative feedback magnetic field proportional to a measurement magnetic field is established. The measurement magnetic field of a measurement target provides magneto-optical rotation of the probe beam in the vapor cell. | 04-28-2016 |
20160139215 | MAGNETISM MEASURING DEVICE, GAS CELL, MANUFACTURING METHOD OF MAGNETISM MEASURING DEVICE, AND MANUFACTURING METHOD OF GAS CELL - A magnetism measuring device includes: a gas cell which includes a cell portion that has a main chamber, a reservoir, a communication hole which allows the main chamber and the reservoir to communicate with each other, and an opening provided in the reservoir, a sealing portion which seals the opening, an ampoule disposed in the reservoir, and an alkali metal gas which fills the main chamber and the reservoir. The ampoule is disposed at a predetermined position in the reservoir, and the opening is provided at a position that is distant from the predetermined position. | 05-19-2016 |
20160169989 | MAGNETIC FIELD MEASURING APPARATUS | 06-16-2016 |