Patents Assigned to Observatoire de Paris
  • Patent number: 10222678
    Abstract: According to an aspect, the present description concerns a frequency-tunable laser source comprising: a set of N elementary sources (101-k), each elementary source being suitable for emitting a beam at a given central frequency (fk); an optical coupler (12) for coupling the beams emitted by each of the elementary sources in order to form a multi-spectral incident beam (Bin) regrouping all the frequencies of the N elementary sources in a same optical beam; a beam splitter (15) for forming, from the incident beam (Bin), a first beam (B1) and a second beam (B2), each regrouping all the frequencies of the elementary sources; a first tunable filter (16) for selecting, from the first beam (B1), a third beam (B3) at a first frequency (Fj); a second tunable filter (17) for selecting, from the second beam (B2), a fourth beam (B4) at a second frequency (Fl); a nonlinear frequency doubling crystal (18) for generating, from the third beam at the first frequency (Fj), a fifth beam (B5) having a frequency (F2j) which is tw
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: March 5, 2019
    Assignees: Centre National De La Recherche Scientifique—CNRS, Observatoire de Paris
    Inventor: Mohand Ouali Acef
  • Publication number: 20180356706
    Abstract: According to an aspect, the present description concerns a frequency-tunable laser source comprising: a set of N elementary sources (101-k), each elementary source being suitable for emitting a beam at a given central frequency (fk); an optical coupler (12) for coupling the beams emitted by each of the elementary sources in order to form a multi-spectral incident beam (Bin) regrouping all the frequencies of the N elementary sources in a same optical beam; a beam splitter (15) for forming, from the incident beam (Bin), a first beam (B1) and a second beam (B2), each regrouping all the frequencies of the elementary sources; a first tunable filter (16) for selecting, from the first beam (B1), a third beam (B3) at a first frequency (F1); a second tunable filter (17) for selecting, from the second beam (B2), a fourth beam (B4) at a second frequency (); a nonlinear frequency doubling crystal (18) for generating, from the third beam at the first frequency (Fj), a fifth beam (B5) having a frequency (F2j) which is twic
    Type: Application
    Filed: March 23, 2016
    Publication date: December 13, 2018
    Applicants: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - CNRS, Observatoire de Paris
    Inventor: Mohand Ouali Acef
  • Patent number: 10041835
    Abstract: Coherent spectroscopic methods are described, to measure the total phase difference during an extended interrogation interval between the signal delivered by a local oscillator (10) and that given by a quantum system (QS).
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: August 7, 2018
    Assignees: Centre National De La Recherche Scientifique—CNRS, Institut D'Optique Graduate School, Observatoire De Paris
    Inventors: Andrea Bertoldi, Ralf Kohlhaas, Arnaud Landragin, Philippe Luc Bouyer
  • Publication number: 20170356803
    Abstract: Coherent spectroscopic methods are described, to measure the total phase difference during an extended interrogation interval between the signal delivered by a local oscillator (10) and that given by a quantum system (QS).
    Type: Application
    Filed: December 18, 2015
    Publication date: December 14, 2017
    Applicants: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - CNR S, Institut d'Optique Graduate School, Observatoire de Paris
    Inventors: Andrea Bertoldi, Ralf Kohlhaas, Arnaud Landragin, Philippe Luc Bouyer
  • Patent number: 9690165
    Abstract: According to a first aspect, the invention relates to a generator of at least three coherent laser beams at least one beam of which is in the infrared domain and at least one beam of which is in the visible domain, comprising: an elementary source for emitting a first continuous-wave laser beam, at a first given infrared wavelength; a nonlinear crystal frequency doubler, allowing, from a first beam sampled from the first laser beam at the first wavelength, a second laser beam to be generated at a second wavelength; and a nonlinear crystal sum frequency generator, allowing, from a second beam sampled from the first laser beam at the first wavelength and from the second laser beam at the second wavelength, a third laser beam to be generated at a third wavelength.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: June 27, 2017
    Assignees: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE-CNRS, Observatoire De Paris
    Inventors: Mohand Ouali Acef, Frédéric Du Burck, Noël Dimarcq
  • Publication number: 20160124286
    Abstract: According to a first aspect, the invention relates to a generator of at least three coherent laser beams at least one beam of which is in the infrared domain and at least one beam of which is in the visible domain, comprising: an elementary source for emitting a first continuous-wave laser beam, at a first given infrared wavelength; a nonlinear crystal frequency doubler, allowing, from a first beam sampled from the first laser beam at the first wavelength, a second laser beam to be generated at a second wavelength; and a nonlinear crystal sum frequency generator, allowing, from a second beam sampled from the first laser beam at the first wavelength and from the second laser beam at the second wavelength, a third laser beam to be generated at a third wavelength.
    Type: Application
    Filed: April 15, 2014
    Publication date: May 5, 2016
    Applicants: Observatoire De Paris, Centre Nationale de la Recherche Scientifique - CNRS
    Inventors: Mohand Ouali Acef, Frédéric Du Burck, Noël Dimarcq
  • Patent number: 8385376
    Abstract: The invention relates to a laser source with an external cavity generating a useful laser beam (Fu), that comprises at least one laser diode DL (10) mounted in an extended optical cavity (30, 82) defined between two reflecting surfaces (92, 48) forming an optical path for a laser beam Fd generated by the laser diode DL, a mode selection filter (44, 86) in the optical path of the cavity for selecting a resonance mode from a range of resonance modes of the laser beam in the cavity.
    Type: Grant
    Filed: April 24, 2008
    Date of Patent: February 26, 2013
    Assignees: Thales and Centre National d'Etudes Spatiales, Observatoire de Paris
    Inventors: David Holleville, Noel Dimarcq
  • Patent number: 8373112
    Abstract: 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.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: February 12, 2013
    Assignees: CNRS, Observatoire de Paris
    Inventors: Philippe Bouyer, Arnaud Landragin
  • Publication number: 20130022068
    Abstract: The invention relates to a laser system provided with a laser radiation device (1) in which the radiation frequency is controlled by a heterodyne servo circuit particularly using an interferometric circuit (15). Said interferometric circuit comprises a coil of optical fibres (17) which provide a reference for correcting the laser radiation frequency. To obtain good results in the field of spectral purity, all the elements involved in the laser radiation are fibres and the connections thereof are provided by optical fibres. The invention can be used for lasers requiring high spectral purity.
    Type: Application
    Filed: December 3, 2009
    Publication date: January 24, 2013
    Applicants: Observatoire de Paris, Centre National de la Recherche Scientifique, Universite Pierre et Marie Curie, Paris 6
    Inventors: Fabien KEFELIAN, Haifeng JIANG, Pierre LEMONDE, Giorgio SANTARELLI
  • Patent number: 8288712
    Abstract: A guided coherent atom source (1) includes elements for generating neutral atoms in a gaseous state (2), elements for cooling the atoms gas (3), elements for generating a magnetic field (4), including an electro-magnetic micro-chip (6) deposited on a surface (18) of a substrate (14), 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 (10) for emitting and directing an optical coherent beam (12) toward the condensed atoms able to guide the condensed atoms, characterized in that the optical elements (10) and the electro-magnetic micro-chip (6) are integrated onto the same substrate (14). An atomic interferometer using such a source is also disclosed.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: October 16, 2012
    Assignees: Ixsea, Institut d'Optique Graduate School, Observatoire de Paris
    Inventors: Philippe Bouyer, Vincent Josse, William Guerin, Juliette Billy, Arnaud Landragin
  • Publication number: 20110310919
    Abstract: The invention relates to a laser system provided with a laser radiation device (1) in which the radiation frequency is controlled by a heterodyne servo circuit particularly using an interferometric circuit (15). Said interferometric circuit comprises a coil of optical fibres (17) which provide a reference for correcting the laser radiation frequency. To obtain good results in the field of spectral purity, all the elements involved in the laser radiation are fibres and the connections thereof are provided by optical fibres. The invention can be used for lasers requiring high spectral purity.
    Type: Application
    Filed: December 3, 2009
    Publication date: December 22, 2011
    Applicants: OBSERVATOIRE DE PARIS, UNIVERSITE PIERRE ET MARIE CURIE, PARIS 6, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Fabien Kefelian, Haifeng Jiang, Pierre Lemonde, Girorgio Santarelli
  • Patent number: 7950801
    Abstract: The invention relates to a device, for measuring the contrast of fringes in a Michelson interferometer at full field, comprising a Wollaston prism for diverting two perpendicular incident polarizations into two different emergent directions, said diverting means being arranged within the interferometer as substitute for a single polarizer. The device is of application to a Michelson interferometer used in an OCT tomographical system and comprising means for obtaining interferometric contrast without use of a modulation technique or synchronous detection methods.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: May 31, 2011
    Assignees: Centre National de la Recherche Scientifique, Observatoire de Paris, Mauna Kea Technologies
    Inventors: François Lacombe, David Lafaille
  • Patent number: 7658495
    Abstract: A sighting device for an examination by in vivo tomography of an eye of a subject including a viewer controlled by a control system for displaying at least one moving target where the at least one moving target has at least one of a programmable shape and a programmable trajectory, and is visible by the eye of the subject during the examination period to allow the subject to fixate and follow the target with their eye.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: February 9, 2010
    Assignees: Centre National de la Recherche Scientifique, Observatoire de Paris, Mauna Kea Technologies
    Inventors: François Lacombe, David Lafaille, Marie Glanc, Eric Gendron, Douchane Stefanovitch
  • Publication number: 20090242743
    Abstract: A guided coherent atom source (1) includes elements for generating neutral atoms in a gaseous state (2), elements for cooling the atoms gas (3), elements for generating a magnetic field (4), including an electro-magnetic micro-chip (6) deposited on a surface (18) of a substrate (14), 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 (10) for emitting and directing an optical coherent beam (12) toward the condensed atoms able to guide the condensed atoms, characterized in that the optical elements (10) and the electro-magnetic micro-chip (6) are integrated onto the same substrate (14). An atomic interferometer using such a source is also disclosed.
    Type: Application
    Filed: March 18, 2009
    Publication date: October 1, 2009
    Applicants: IXSEA, INSTITUT D'OPTIQUE GRADUATE SCHOOL, OBSERVATOIRE DE PARIS
    Inventors: Philippe BOUYER, Vincent JOSSE, William GUERIN, Juliette BILLY, Arnaud LANDRAGIN
  • Patent number: 7513619
    Abstract: An in-vivo high resolution lateral and axial tomography system of the retina, is provided, including a Michelson interferometer, generating a tomographical image by full field OCT interference with Z sweeping, adaptive optical correction apparatus, correcting the wave fronts coming from and going to the eye, including a reference source, a deformable mirror and wave surface analysis apparatus, detection apparatus producing an image from an interferometric measurement using the OCT principle and apparatus for focussing the wave surface analyser. The apparatus for focussing are embodied and controlled, synchronously with the Z sweeping to force the deformable mirror to adopt an additional curvature, such as to combine the input light source and detection apparatus at a given depth in the retina.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: April 7, 2009
    Assignees: Centre National de la Recherche Scientifique, Observatoire de Paris, Mauna Kea Technologies
    Inventors: François Lacombe, David Lafaille, Marie Glanc, Eric Gendron
  • Patent number: 7438415
    Abstract: A sighting device is provided for an examination of the eye, including at least one moving target with a programmable form and trajectory, the target being displayed on a visualisation unit, such as an appropriate screen and visible from both eyes during the examination. An in-vivo tomographical eye examination system is also provided, including: a Michelson interferometer, generating a full-field OCT image, adaptable optical apparatus, arranged between the interferometer and an eye for examination, achieving the correction of the wavefronts coming from the eye and also the wavefronts going to the eye, detection apparatus, arranged after the interferometer, permitting the interferometric measurement by the OCT principle without modulation nor synchronized detection and a sighting device, with at least one mobile target with a programmable form and trajectory, the target being displayed on an appropriate screen and visible from at least one of the eyes during the examination.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: October 21, 2008
    Assignees: Centre National de la Recherche Scientifique, Observatoire de Paris, Mauna Kea Technologies
    Inventors: François Lacombe, David Lafaille, Marie Glanc, Eric Gendron, Douchane Stefanovitch