Patents by Inventor Emmanuel Rosencher
Emmanuel Rosencher 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).
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Patent number: 7426075Abstract: In a nonlinear optical medium such as the gallium arsenide, two collinear incident monochromatic waves are injected to generate a monochromatic wave. The medium induces between the three waves a propagation phase-shift that has a value ? if the three waves travel a coherence length in the medium and that is compensated at the value 0 modulo 2? each time that the three waves have travelled a periodic distance in the medium. In order to significantly increase the conversion efficiency, the periodic distance between two successive bounces of total internal reflection of the waves in zig-zag is strictly less than the coherence length. The high conversion efficiency on a very short material length leads to product high-power coherent optical sources particularly with wavelengths of approximately 10 ?m.Type: GrantFiled: April 24, 2006Date of Patent: September 16, 2008Assignee: ONERAInventors: Riad Haïdar, Emmanuel Rosencher, Jéröme Primot
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Patent number: 7349149Abstract: The oscillator comprises two resonant cavities in which a non-linear crystal (3) is situated. The incident pumping radiation Rpe follows an emitting path across the crystal, the generated signal and complementary radiation carry out numerous emitted and return paths in the cavities, hence across the crystal and are thus converted into an inverse pumping radiation on the return paths thereof. According to the invention, a device (4) is incorporated in the oscillator for reflection of a fraction of the pumping radiation equivalent to the inverse pumping radiation in the absence of the device.Type: GrantFiled: February 23, 2005Date of Patent: March 25, 2008Assignee: Office National d'Etudes Et de Recherches Aerospatiales (Onera)Inventors: Michel Lefebvre, Aude Desormeaux, Emmanuel Rosencher
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Publication number: 20070223083Abstract: The oscillator comprises two resonant cavities in which a non-linear crystal (3) is situated. The incident pumping radiation Rpe follows an emitting path across the crystal, the generated signal and complementary radiation carry out numerous emitted and return paths in the cavities, hence across the crystal and are thus converted into an inverse pumping radiation on the return paths thereof. According to the invention, a device (4) is incorporated in the oscillator for reflection of a fraction of the pumping radiation equivalent to the inverse pumping radiation in the absence of the device.Type: ApplicationFiled: February 23, 2005Publication date: September 27, 2007Inventors: Michel Lefebvre, Aude Desormeaux, Emmanuel Rosencher
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Publication number: 20060238854Abstract: In a nonlinear optical medium such as the gallium arsenide, two collinear incident monochromatic waves are injected to generate a monochromatic wave. The medium induces between the three waves a propagation phase-shift that has a value ? if the three waves travel a coherence length in the medium and that is compensated at the value 0 modulo 2? each time that the three waves have travelled a periodic distance in the medium. In order to significantly increase the conversion efficiency, the periodic distance between two successive bounces of total internal reflection of the waves in zig-zag is strictly less than the coherence length. The high conversion efficiency on a very short material length leads to product high-power coherent optical sources particularly with wavelengths of approximately 10 ?m.Type: ApplicationFiled: April 24, 2006Publication date: October 26, 2006Applicant: ONERA (Office National d'Etudes et de Recherches AerospatialesInventors: Riad Haidar, Emmanuel Rosencher, Jerome Primot
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Patent number: 6236045Abstract: An infrared imaging device including a quantum device positioned and configured to detect infrared transmission at ambient temperature, a cooler thermally coupled to the quantum device, and controller for controlling the cooler based on a function of plural image-taking parameters as a command.Type: GrantFiled: December 22, 1998Date of Patent: May 22, 2001Assignee: Thomson-CSFInventors: Emmanuel Rosencher, François Micheron
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Patent number: 6236670Abstract: A laser made of a stack of laser diodes. The stack is inserted between two mirrors to create a laser cavity. The stack of diodes is produced by epitaxial growth of a set of semiconductor layers. The ohmic contact between two adjacent laser diodes is provided by an Esaki diode junction. The optical field of the mode created in the laser cavity is periodically cancelled at the Esaki diode junctions so as to create structures with small dimensions.Type: GrantFiled: November 25, 1998Date of Patent: May 22, 2001Assignee: Thomson-CSFInventors: Julien Nagle, Emmanuel Rosencher
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Patent number: 5969375Abstract: A detector with quantum structure comprising a small-gap semiconductor material inserted between two large-gap semiconductor materials, the structure comprising a coupling grating between the wave to be detected and the detector zone constituted by the small-gap material. Under these conditions, the detector zone may have a very small thickness (typically of the order of 1,000 .ANG.) and lead to a detectivity, limited by the dark current, that is high.Type: GrantFiled: December 16, 1997Date of Patent: October 19, 1999Assignee: Thomson-CSFInventors: Emmanuel Rosencher, Borge Vinter, Vincent Berger, Daniel Kaplan, Fran.cedilla.ois Micheron
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Patent number: 5869844Abstract: Device for the detection and processing of optical radiations, comprising at least one quantum well having asymmetric composition, said well consisting of a stack of layers of materials having differing gaps.Type: GrantFiled: January 17, 1995Date of Patent: February 9, 1999Assignee: Thomson-CSFInventors: Emmanuel Rosencher, Philippe Bois
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Patent number: 5739949Abstract: A frequency converter can be used, in particular, to generate optical waves in the medium infrared (3.12 .mu.m) range from optical sources in the near infrared range. It comprises a heterostructure semiconductor waveguide formed by an alternation of layers of material M.sub.I and M.sub.II, at least one of these materials being a non-linear semiconductor and the plane of the layers being parallel to the direction of propagation of the electromagnetic waves in the waveguide.Type: GrantFiled: June 28, 1996Date of Patent: April 14, 1998Assignee: Thomson-CSFInventors: Emmanuel Rosencher, Vincent Berger
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Patent number: 5726500Abstract: Semiconductor hybrid components, especially linear infrared detectors produced by hybridization. A main substrate has integrated thereon active elements which cannot be produced on a silicon substrate. The substrate is made, for example, of AsGa, InP, HgCdTe or PbTe. Several silicon chips are mounted on the main substrate, by hybridization using indium balls. These chips include the read and multiplexing circuits. The silicon chips remain of limited size (a few millimeters) so that the differential thermal expansion stresses are limited, but the detection array may be produced as one piece without butt-joining. It is therefore possible to produce arrays of great length (several centimeters) and of high resolution (at least a thousand points).Type: GrantFiled: December 7, 1995Date of Patent: March 10, 1998Assignee: Thomson-CSFInventors: Jean-Yves Duboz, Emmanuel Rosencher, Philippe Bois
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Patent number: 5506418Abstract: An electromagnetic wave detector formed of semiconductor materials includes at least one quantum well in which there is provided a fine layer of a material with a gap width that is smaller than that of the quantum well layer. For example, in the case of a GaAlAs/GaAs/GaAlAs, there is provision for a fine layer of InAs. In this way, the difference of energy levels between the two permitted levels is increased and detection of short wavelengths may be accomplished.Type: GrantFiled: March 21, 1995Date of Patent: April 9, 1996Assignee: Thomson-CSFInventors: Philippe Bois, Emmanuel Rosencher, Borge Vinter, Jean Massies, Gerard Neu, Nicolas Grandjean
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Patent number: 5326984Abstract: An electromagnetic wave detector comprises a stack of quantum wells included between an ohmic contact and a rectifier junction which may be a barrier (Al.sub.y Ga.sub.1-y As) with a forbidden band width that is greater than that of the barriers of the quantum wells.Type: GrantFiled: June 30, 1992Date of Patent: July 5, 1994Assignee: Thomson-CSFInventors: Emmanuel Rosencher, Philippe Bois
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Patent number: 5311278Abstract: A light intensity modulator with a predefined range of modulation wavelengths (preferably a narrow range) can be adjusted by a control signal. This modulator receives a light beam and retransmits a modulated light beam in which any wavelength within the modulation range is modulated. A light intensity detector receives this modulated beam and outputs an electrical signal which is a function of the luminous intensity detected. Such a device finds particular application as a spectrophotometer.Type: GrantFiled: October 8, 1992Date of Patent: May 10, 1994Assignee: Thomson-CSFInventor: Emmanuel Rosencher
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Patent number: 5228777Abstract: An electronic bolometer comprises at least a quantum well between two barrier layers. It has an input side parallel to the quantum-well layer and receiving a beam at a quasi-normal incidence angle. Two electrodes disposed perpendicularly to the quantum-well layers allow to measure a change in the resistivity of said quantum well.Type: GrantFiled: November 6, 1991Date of Patent: July 20, 1993Assignee: Thomson-CSFInventors: Emmanuel Rosencher, Philippe Bois
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Patent number: 5086327Abstract: A capacitive detector of electromagnetic waves, comprises three electron levels, wherein an internal barrier prevents a strong coupling between two levels of two neighboring wells. During an irradiation, the electrons are excited from a first level to a second level. The electrons then relax towards a third level until they relax, by tunnel effect, towards the first level. During the transition from the first level towards the third level, a dipole is created. This dipole can be detected by a detector, through the measurement of a potential difference at the terminals of the device.Type: GrantFiled: October 9, 1990Date of Patent: February 4, 1992Assignee: Thomson-CSFInventors: Emmanuel Rosencher, Borge Vinter, Paul Bois