Institut D'optique Graduate School

Centre National De La Recherche Scientifique

Observatoire De Paris

Universitë De Bordeaux

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Etat Francais Represente Par Letdelegue General Pour L'armement

Centre National De La Recherche Scientifique-cnrs

Philippe Bouyer

Arnaud Landragin

Baptiste Battelier

Pierrick Cheiney

David Brynle Barrett

Fabien Napolitano

Bruno Desruelle

Alain Aspect

Michel Lecrivain

Baptiste Gouraud

Vincent Josse

Vincent Boyer

Ralf Kohlhaas

William Guerin

Brynle Barrett

Juliette Billy

Andrea Bertoldi

David Brynle Barret

William Guérin

Disclosed is a multi-axis atom interferometer system, including a source of cold atoms, a laser source generating a first light pulse configured in such a way as to spatially split the source of cold atoms into a first cloud of atoms propagating along a first trajectory along a first axis and a second cloud of atoms propagating along a second trajectory along a second axis, a second light pulse adapted to spatially deflect the first trajectory along the second axis and simultaneously the second trajectory along the first axis towards a first point and a last light pulse adapted to recombine the at least one part of the first cloud of atoms and the at least one part of the second cloud of atoms at the first point, and a detection system measuring an interferometric phase-shift accumulated between the first light pulse and the last light pulse.

Multi-axis atom interferometer system and method

Disclosed is an atomic interferometer including a source of atoms, a laser source and a magnetic field generating device, a polarizer, a system for adjusting a detuning between two optical frequencies of the incident laser beam, a two-dimensional diffraction grating arranged in such a way as to receive the incident laser beam and to form by diffraction at least three diffracted beams, a controller configured to select a combination of an optical frequency detuning, a polarization state and a magnetic field, the combination being adapted to select a first pair of laser beams among the pairs of beams formed from the incident laser beam and the diffracted beams, the pair of laser beams being applied in such a way as to interact with the cloud of atoms by multi-photon transitions and to detect an acceleration of the cloud of atoms along a measurement direction.

Two-dimensional diffraction grating atomic interferometer and atomic interferometry method

Disclosed is a hybrid inertial measurement system including a cold atom interferometric inertial sensor having a laser source generating a sequence of laser pulses towards a cold atom burst and a conventional inertial sensor attached to the inertial reference frame of the interferometric inertial sensor. The hybrid system includes a signal processing system suitable for receiving an inertial measurement signal from the conventional inertial sensor and for generating in real time a non-linear frequency modulation signal, the feedback loop electronic system being configured to modulate in real time the central optical frequency of the laser according to the modulation signal, such that the cold atom interferometric inertial sensor generates a first hybrid inertial measurement signal by atomic interferometry corrected for the relative movements of the inertial reference frame.

Hybrid inertial measurement system and method using a light pulse cold atom interferometer

Coherent spectroscopic methods are described, to measure the total phase difference during an extended interrogation interval between the signal delivered by a local oscillator () and that given by a quantum system (QS). According to one or more embodiments, the method may comprise reading out at the end of successive interrogation sub-intervals (Ti) intermediate error signals corresponding to the approximate phase difference (&#x3c6;) between the phase of the LO signal and that of the quantum system, using coherence preserving measurements; shifting at the end of each interrogation sub-intervals (Ti) the phase of the local oscillator signal, by a known correction value ((i)) so as to avoid that the phase difference approaches the limit of the inversion region; reading out a final phase difference (&#x3c6;f) between the phase of the prestabilized oscillator signal and that of the quantum system using a precise measurement with no restriction on the destruction; reconstructing a total phase difference over the extended interrogation interval, as the sum of the final phase difference (&#x3c6;f) and the opposite of all the applied phase corrections figure (I).

Coherent spectroscopic methods with extended interrogation times and systems implementing such methods

A cold atom gravity gradiometer system includes a laser source that generates a laser beam that propagates along a propagation direction. The system further includes a reflector that reflects a portion of the laser beam and transmits another portion of the laser beam (the transmitted portion). A second reflector spatially separated from the first reflector along the propagation direction reflects the transmitted portion of the laser beam.

Cold atom gravity gradiometer

The disclosure relates to a cold atom interferometry sensor that includes: a source of atoms; a dual-frequency laser capable of generating a first Raman dual-frequency laser beam; a reflector arranged so as to reflect the first Raman dual-frequency laser beam in order to generate a second Raman dual-frequency laser beam, the first laser beam and the second laser beam propagating in different directions in order to obtain atomic interference fringes from the emission of cold atoms obtained from the atom source; characterized in that the reflector is further arranged so as to enable multiple reflections of the first beam on surfaces of the reflector, so that the first beam and the multiple reflections thereof allow the capture of atoms from the atom source in order to obtain the cold atoms.

Cold atom interferometry sensor

A guided coherent atom source () includes elements for generating neutral atoms in a gaseous state (), elements for cooling the atoms gas (), elements for generating a magnetic field (), including an electro-magnetic micro-chip () deposited on a surface () of a substrate (), and capable of condensing the atoms in a magnetic trap, elements for generating an electro-magnetic RF field capable of extracting the condensed atoms, optical elements () for emitting and directing an optical coherent beam () toward the condensed atoms able to guide the condensed atoms, characterized in that the optical elements () and the electro-magnetic micro-chip () are integrated onto the same substrate (). An atomic interferometer using such a source is also disclosed.

Guided coherent atom source and atomic interferometer

An electromagnetic device for producing cold neutral atoms having a ferromagnetic structure with four poles disposed in the same plane XOY excited by main coils (the quadrupole) supplying the main excitation, and two additional poles (the dipole) oriented along an axis Z and perpendicular to the plane of said four poles, the poles being magnetically coupled by one or more yokes.

Electromagnetic device for production of cold neutral atoms

Growing community of inventors

Talence, France

Philippe Bouyer