Patents by Inventor Gerald Roosen
Gerald Roosen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 8098697Abstract: The invention concerns an optical device comprising an optical source for emitting a light beam in a plurality of emitting wavelengths and at least one laser, each of said at least one laser including a holographic medium (MH), means for injecting (FO, MCS, MUX, CO, IO, AV) said light beam derived from said optical source into said at least one laser, said holographic medium (MH) being adapted to generate a laser in at least one oscillation mode, said at least one oscillation mode being determined by at least one excitation wavelength among the plurality of emitting wavelengths. The invention is characterized in that said optical source comprises a light source emitting simultaneously in said plurality of emitting wavelengths.Type: GrantFiled: October 12, 2006Date of Patent: January 17, 2012Assignee: Centre National de la Recherche Scientifique-CNRSInventors: Nicolas Dubreuil, Gilles Pauliat, Gérald Roosen
-
Patent number: 7944793Abstract: The invention concerns the field of holographic storage units. More particularly, the invention concerns the field of holographic storage units used for bit-by-bit storage of information. It concerns a method for reading data recorded in a holographic material in the form of a hologram obtained by interference of two beams of substantially the same wavelength, and using at least one reflecting layer. The invention is characterized in that it includes the following steps: emitting a light comprising at least said wavelength at said holographic material comprising said hologram; performing a homodyne detection between the signal resulting from the first light diffracted by said hologram and at least one signal selected between the reflected signal and the signal transmitted by said at least one reflecting layer.Type: GrantFiled: December 20, 2005Date of Patent: May 17, 2011Assignees: Centre National de la Recherche Scientifique - CNRS, Universite Paris SUDInventors: Gilles Pauliat, Guillaume Maire, Gerald Roosen
-
Patent number: 7733742Abstract: This invention concerns an acousto-optic imaging method comprising a step which consists in engraving in a dynamic holographic material a complex index array resulting from the interference of the acousto-optic component of the signal wave and a pump wave of frequency equal to the frequency of the acousto-optic component.Type: GrantFiled: June 10, 2005Date of Patent: June 8, 2010Assignees: Centre National de la Recherche Scientifique (CNRS), Universite Pierre et Marie Curie (Paris VI)Inventors: Michel Gross, Francois Georges Gerard Ramaz, Benoit Claude Forget, Gerald Roosen, Philippe Delaye, Albert-Claude Boccara
-
Patent number: 7609384Abstract: A process for generating a carrier in an interferogram in interferometry device either of the “real-time holographic interferometry” type or of the “double-exposure holographic interferometry” type, including recording a first wave front on a hologram, the first wave front coming from an object; generating a second wave front, in which two wave fronts are superimposed orthogonally polarizing said first and second wave fronts, either naturally or by a modification stage; and passing the orthogonally polarized two wave fronts through a birefringent crystal, a polarizer and a detector to make the two wave fronts interfere.Type: GrantFiled: March 10, 2004Date of Patent: October 27, 2009Assignees: Centre National de la Recherche Scientifique-CNRS, Universite Paris-SUDInventors: Gerald Roosen, Gilles Pauliat
-
Publication number: 20090252183Abstract: The invention concerns an optical device comprising an optical source for emitting a light beam in a plurality of emitting wavelengths and at least one laser, each of said at least one laser including a holographic medium (MH), means for injecting (FO, MCS, MUX, CO, IO, AV) said light beam derived from said optical source into said at least one laser, said holographic medium (MH) being adapted to generate a laser in at least one oscillation mode, said at least one oscillation mode being determined by at least one excitation wavelength among the plurality of emitting wavelengths. The invention is characterized in that said optical source comprises a light source emitting simultaneously in said plurality of emitting wavelengths.Type: ApplicationFiled: October 12, 2006Publication date: October 8, 2009Applicant: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE-CNRSInventors: Nicolas Dubreuil, Gilles Pauliat, Gerald Roosen
-
Patent number: 7519092Abstract: An optical apparatus including a tunable master laser from which all or some of a beam is injected into at least one “slave ” laser having a cavity with an amplifier medium and a dynamic holographic medium that forms a self-adapted spectral filter to maintain oscillation of the slave laser at a wavelength imposed by the master laser during injection after injection has stopped.Type: GrantFiled: April 14, 2005Date of Patent: April 14, 2009Assignees: Centre National de la Recherche Scientifique - CNRS, Universite Paris-SUDInventors: Nicolas Dubreuil, Gilles Pauliat, Gérald Roosen
-
Publication number: 20080130461Abstract: The invention concerns the field of holographic storage units. More particularly, the invention concerns the field of holographic storage units used for bit-by-bit storage of information. It concerns a method for reading data recorded in a holographic material in the form of a hologram obtained by interference of two beams of substantially the same wavelength, and using at least one reflecting layer. The invention is characterized in that it includes the following steps: emitting a light comprising at least said wavelength at said holographic material comprising said hologram; performing a homodyne detection between the signal resulting from the first light diffracted by said hologram and at least one signal selected between the reflected signal and the signal transmitted by said at least one reflecting layer.Type: ApplicationFiled: December 20, 2005Publication date: June 5, 2008Applicants: Centre National de la Recherche Scientifique-CNRS an Institute of France, Universite Paris SUD, an Institute of FranceInventors: Gilles Pauliat, Guillaume Maire, Gerald Roosen
-
Publication number: 20070242706Abstract: An optical apparatus including a tunable master laser from which all or some of a beam is injected into at least one “slave ” laser having a cavity with an amplifier medium and a dynamic holographic medium that forms a self-adapted spectral filter to maintain oscillation of the slave laser at a wavelength imposed by the master laser during injection after injection has stopped.Type: ApplicationFiled: April 14, 2005Publication date: October 18, 2007Inventors: Nicolas Dubreuil, Gilles Pauliat, Gerald Roosen
-
Publication number: 20060152732Abstract: A process for generating a carrier in an interferogram in an interferometry device either of the “real-time holographic interferometry” type or of the “double-exposure holographic interferometry” type, including recording a first wave front on a hologram and coming from an object; generating a second wave front, which two wave fronts are superposed; orthogonally polarizing the superposed wave fronts, either naturally or by a modification stage; and passing the orthogonally polarized two wave fronts through a birefringent crystal, a polarizer and a detector to make these two wave fronts interfere.Type: ApplicationFiled: March 10, 2004Publication date: July 13, 2006Inventors: Gerald Roosen, Gilles Pauliat
-
Publication number: 20040141533Abstract: This invention relates to a continuously wavelength tunable monomode laser source with external cavity comprising a resonant cavity having a reflecting plane face, means for extracting a portion of the luminous flux and a retroreflecting dispersive device, an amplifier wave guide located inside the resonant cavity, means for controlling the retroreflecting dispersive device providing continuous tunability.Type: ApplicationFiled: March 17, 2004Publication date: July 22, 2004Inventors: Herve Lefevre, Philippe Graindorge, Gerald Roosen, Jean-Michel Jonathan, Gilles Pauliat
-
Patent number: 6674782Abstract: Laser type source of coherent luminous radiation including a resonant cavity, an amplification medium placed in the resonant cavity and a dynamic photosensitive material which is placed in the resonant cavity to form a self-adapting spectral and/or spatial filter, characterized in that the cavity is a ring laser cavity and in that the dynamic photosensitive material is placed at the intersection of two beams.Type: GrantFiled: April 25, 2001Date of Patent: January 6, 2004Assignee: Centre National de la Recherche Scientifique - CNRSInventors: Gérald Roosen, Alain Brun, Nicolas Huot, Jean-Michel Jonathan, Gilles Pauliat, Patrick Georges
-
Patent number: 6486959Abstract: A process for velocimetric measurement of a target including causing interference in a dynamic holographic material of a reference laser beam and a beam diffused by the target, and measuring variations in luminous intensity transmitted by the material with a photoelectric detector, wherein the target vibrates with a displacement greater than the wavelength and with an extension limited around a mean position.Type: GrantFiled: January 4, 2001Date of Patent: November 26, 2002Assignee: Centre National de la Recherche Scientifique - CNRSInventors: Philippe Delaye, Gérald Roosen
-
Publication number: 20020105651Abstract: A process for velocimetric measurement of a target including causing interference in a dynamic holographic material of a reference laser beam and a beam diffused by the target, and measuring variations in luminous intensity transmitted by the material with a photoelectric detector, wherein the target vibrates with a displacement greater than the wavelength and with an extension limited around a mean position.Type: ApplicationFiled: January 4, 2001Publication date: August 8, 2002Inventors: Philippe Delaye, Gerald Roosen
-
Publication number: 20020006150Abstract: Laser type source of coherent luminous radiation including a resonant cavity, an amplification medium placed in the resonant cavity and a dynamic photosensitive material which is placed in the resonant cavity to form a self-adapting spectral and/or spatial filter, characterized in that the cavity is a ring laser cavity and in that the dynamic photosensitive material is placed at the intersection of two beams.Type: ApplicationFiled: April 25, 2001Publication date: January 17, 2002Inventors: Gerald Roosen, Alain Brun, Nicolas Huot, Jean-Michel Jonathan, Gilles Pauliat, Patrick Georges
-
Patent number: 6222633Abstract: A gyroscope comprising a source for emitting a light beam, an optical fiber loop in which the light propagates in both directions, a dual phase-conjugate mirror disposed in said loop in such a manner that light reaches said mirror from both sides thereof, recombination means for recombining the light which has propagated round the loop, and detector means for detecting the recombined signal, wherein the loop includes a monomode fiber that does not conserve polarization and wherein depolarization means are disposed between said fiber and the phase-conjugate mirror, on either side thereof.Type: GrantFiled: January 5, 2000Date of Patent: April 24, 2001Assignee: SFIM IndustriesInventors: Jean Thierry Audren, Gerald Roosen, Philippe Delaye
-
Patent number: 5680212Abstract: A method and apparatus are provided of optically detecting transient motion from the surface of a workpiece. After directing a laser beam onto a surface of a workpiece the beam is reflected from it and then interferes with a pump beam removed from the laser source, inside a real-time holographic material, so as to form a grating diffracting the pump beam into a reference beam, which interferes at the output of the real-time holographic material with the received light beam, so as to produce a signal representative of the surface transient motion. An electric field is applied to the holographic material of sufficient magnitude to increase substantially the intensity of said reference beam and to give to this beam a phase differing substantially from the phase of said received light beam.Type: GrantFiled: April 15, 1996Date of Patent: October 21, 1997Assignee: National Research Council of CanadaInventors: Alain Blouin, Philippe Delaye, Denis Drolet, Jean-Pierre Monchalin, Gerald Roosen