Patents by Inventor Alexandre Katchanov
Alexandre Katchanov 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: 11719630Abstract: The disclosure relates to a gas analysis method by Raman spectrometry, the method comprising the steps of generating by a laser source a laser beam sweeping a range of frequencies including a plurality of resonance modes of an optical cavity holding gases to be analyzed; delivering the laser beam into the cavity; extracting from the cavity a feedback beam that is sent adjusted in phase and amplitude to the source; during the frequency range sweeping, detecting light intensity peaks in the laser beam in the cavity, the phase of the feedback beam being adjusted to reduce shape asymmetries of the peaks, the amplitude of the feedback beam being adjusted to reduce intervals of zero intensity between the peaks; and performing a spectral analysis of the light inelastically scattered in the cavity, to determine the composition of the gases to be analyzed.Type: GrantFiled: January 15, 2020Date of Patent: August 8, 2023Assignee: AP2EInventors: Alexandre Katchanov, Kevin Jaulin, Tim Stoltmann, Pierre Cholat, Lucien Lonigro, Bruno Giletta
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Publication number: 20220065778Abstract: The disclosure relates to a gas analysis method by Raman spectrometry, the method comprising the steps of generating by a laser source a laser beam sweeping a range of frequencies including a plurality of resonance modes of an optical cavity holding gases to be analyzed; delivering the laser beam into the cavity; extracting from the cavity a feedback beam that is sent adjusted in phase and amplitude to the source; during the frequency range sweeping, detecting light intensity peaks in the laser beam in the cavity, the phase of the feedback beam being adjusted to reduce shape asymmetries of the peaks, the amplitude of the feedback beam being adjusted to reduce intervals of zero intensity between the peaks; and performing a spectral analysis of the light inelastically scattered in the cavity, to determine the composition of the gases to be analyzed.Type: ApplicationFiled: January 15, 2020Publication date: March 3, 2022Inventors: Alexandre KATCHANOV, Kevin JAULIN, Tim STOLTMANN, Pierre CHOLAT, Lucien LONIGRO, Bruno GILETTA
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Publication number: 20060056465Abstract: A tunable laser and laser tuning method based on the use of a tunable etalon in reflection as a mirror within a laser cavity. The laser emission wavelength is not necessarily at a wavelength of peak etalon reflectivity. A preferred embodiment makes use of a microelectromechanical etalon to tune an external cavity semiconductor laser.Type: ApplicationFiled: September 10, 2004Publication date: March 16, 2006Inventors: Jinchun Xie, Alexandre Katchanov, Barbara Paldus
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Patent number: 6967976Abstract: A tunable laser and laser tuning method based on the use of a tunable etalon in reflection as a mirror within a laser cavity and forming an end reflective surface thereof. The laser emission wavelength is not necessarily at a wavelength of peak etalon reflectivity. A preferred embodiment makes use of a microelectromechanical etalon to tune an external cavity semiconductor.Type: GrantFiled: August 3, 2004Date of Patent: November 22, 2005Assignee: Picarro, Inc.Inventors: Jinchun Xie, Alexandre Katchanov, Barbara Paldus
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Patent number: 6959023Abstract: A tunable laser and laser tuning method based on the use of a tunable etalon in reflection as a mirror within a laser cavity. The laser emission wavelength is not necessarily at a wavelength of peak etalon reflectivity. A preferred embodiment makes use of a microelectromechanical etalon to tune an external cavity semiconductor laser.Type: GrantFiled: August 29, 2002Date of Patent: October 25, 2005Assignee: Picarro, Inc.Inventors: Jinchun Xie, Alexandre Katchanov, Barbara A. Paldus
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Publication number: 20050008045Abstract: A tunable laser and laser tuning method based on the use of a tunable etalon in reflection as a mirror within a laser cavity and forming an end reflective surface thereof. The laser emission wavelength is not necessarily at a wavelength of peak etalon reflectivity. A preferred embodiment makes use of a microelectromechanical etalon to tune an external cavity semiconductor.Type: ApplicationFiled: August 3, 2004Publication date: January 13, 2005Inventors: Jinchun Xie, Alexandre Katchanov, Barbara Paldus
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Publication number: 20040165641Abstract: An optical fiber transmitter for emitting an information-carrying laser beam comprises an optically or electrically pumped single mode MQW (multi-quantum well) semiconductor amplifying mirror as a gain medium and a separate external reflector to form a cavity. The external cavity length defines a comb of optical modes, all or a subset of which correspond to channel wavelengths of an optical telecommunications system having plural optical channels. The semiconductor gain element has a homogeneously broadened gain region; a tuning arrangement tunes the laser from mode to mode across the gain region, thereby selecting each one of the plural optical channels. When the maximum gain bandwidth is less than mode-to-mode spacing defined by the cavity, the tuning arrangement includes a means of altering the temperature of the amplifying mirror, thereby translating the frequency of the gain peak from one mode to another.Type: ApplicationFiled: February 2, 2004Publication date: August 26, 2004Inventors: Arnaud Garnache, Daniele Romanini, Marc Levenson, Robert Lodenkamper, Frederic Stoeckel, Alexandre Katchanov, Guido Knippels, Barbara Paldus, Christopher Rella, Bruce Richman
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Patent number: 6741629Abstract: An optical fiber transmitter comprises an optically pumped single mode MQW VECSEL for emitting an information-carrying laser beam and has an external cavity length defining a comb of optical modes, each mode corresponding to a channel wavelength of an optical telecommunications system having plural optical channels. A semiconductor structure of the VECSEL has an optical-pump-excited multiple quantum well (MQW) homogeneously broadened gain region active over a band which is less than mode-to-mode spacing, the gain region being tunable to hop from a first mode to an adjacent second mode. A tuning arrangement tunes the VECSEL from mode to mode thereby to select each one of the plural optical channels. An optical modulator adds modulation to a beam emitting from the laser to provide the information-carrying laser beam, and a coupler couples the information-carrying laser beam into an optical fiber of the optical telecommunications system.Type: GrantFiled: September 22, 2000Date of Patent: May 25, 2004Assignee: Blueleaf, Inc.Inventors: Arnaud Garnache, Alexandre Katchanov, Barbara Paldus, Daniele Romanini, Frederic Stoeckel
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Patent number: 6711203Abstract: An optical fiber transmitter for emitting an information-carrying laser beam comprises an optically or electrically pumped single mode MQW (multi-quantum well) semiconductor amplifying mirror as a gain medium and a separate external reflector to form a cavity. The external cavity length defines a comb of optical modes, all or a subset of which correspond to channel wavelengths of an optical telecommunications system having plural optical channels. The semiconductor gain element has a homogeneously broadened gain region; a tuning arrangement tunes the laser from mode to mode across the gain region, thereby selecting each one of the plural optical channels. When the maximum gain bandwidth is less than mode-to-mode spacing defined by the cavity, the tuning arrangement includes a means of altering the temperature of the amplifying mirror, thereby translating the frequency of the gain peak from one mode to another.Type: GrantFiled: March 22, 2002Date of Patent: March 23, 2004Assignee: BlueLeaf, Inc.Inventors: Arnaud Garnache, Daniele Romanini, Frederic Stoeckel, Alexandre Katchanov, Guido Knippels, Barbara Paldus, Christopher Rella, Bruce Richman, Marc Levenson, Robert Lodenkamper
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Patent number: 6665069Abstract: System and method for simultaneously providing a wavelength spectral distribution and a temporal distribution of an incident light beam. The light beam is received at a wavelength spectral distribution module and is separated into light beam segments corresponding to at least two different wavelengths in a first selected direction transverse to beam propagation direction. The light beam is also received at a temporal distribution module, and segments of the light beam are distributed corresponding to at least two different times at which light in the beam was produced, in a second selected direction that is substantially perpendicular to the first direction. The temporal distribution module may include a rotating segmented mirror.Type: GrantFiled: November 9, 2001Date of Patent: December 16, 2003Assignee: Blueleaf, Inc.Inventors: Dmitri Permogorov, Alexandre Katchanov, Hoa Pham, Gerald P. Coleman
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Patent number: 6658034Abstract: A laser suitable for intra-cavity laser absorption spectroscopy and for telecommunication system comprises a Bragg mirror, a multiple quantum well active region and an anti-reflective coating together with a second mirror spaced from the coating to define an external cavity, the free spectral range of the sub-cavity defined by the coating and the active region being less than two times the bandwidth of the coating and the bandwidth of the Bragg mirror being at least as great as the free spectral range of the sub-cavity.Type: GrantFiled: December 13, 2000Date of Patent: December 2, 2003Assignee: Picarro, Inc.Inventors: Arnaud Garnache, Alexandre Katchanov, Frederick Stoeckel
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Patent number: 6611546Abstract: An optical fiber transmitter for emitting an information-carrying laser beam comprises an optically or electrically pumped single mode MQW (multi quantum well) semiconductor amplifying mirror as a gain medium and a separate external reflector to form a cavity. The external cavity length defines a comb of optical modes, all or a subset of which corresponding to channel wavelengths of an optical telecommunications system having plural optical channels. The semiconductor gain element has a homogeneously broadened gain region; a tuning arrangement tunes the laser from mode to mode across the gain region thereby selecting each one of the plural optical channels. When the maximum gain bandwidth is less than mode-to-mode spacing defined by the cavity, that tuning arrangement comprises a means of altering the temperature of the amplifying mirror, thereby translating the frequency of the gain peak from one mode to another.Type: GrantFiled: August 15, 2001Date of Patent: August 26, 2003Assignee: BlueLeaf, Inc.Inventors: Arnaud Garnache, Daniele Romanini, Frederic Stoeckel, Alexandre Katchanov, Guido Knippels, Barbara Paldus, Christopher Rella, Bruce Richman, Marc Levenson
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Patent number: 6504145Abstract: The invention concerns a method for detecting gas traces with a semiconductor laser coupled with an optical resonant cavity containing a species to be analyzed. The laser is coupled with the cavity so that the light is not projected back towards the laser when the cavity is in resonance mode. The laser supplies an amplified and fine-tuned emission on the re-injected frequency and, when a current pulse is applied thereon, its frequency moves from a predetermined initial frequency to a final predetermined frequency. The laser is excited by a first current pulse such that its frequency is sequentially locked on the cavity successive modes. The luminous intensity decreasing time in the cavity is measured at the end of the pulse and the excitation and measurement steps are repeated for successive current pulses, to cover a spectral range to be analyzed.Type: GrantFiled: October 30, 2000Date of Patent: January 7, 2003Assignee: Universite Joseph FourierInventors: Daniele Romanini, Alexandre Katchanov
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Publication number: 20020071463Abstract: A laser suitable for intra-cavity laser absorption spectroscopy and for telecommunication system comprises a Bragg mirror, a multiple quantum well active region and an anti-reflective coating together with a second mirror spaced from the coating to define an external cavity, the free spectral range of the sub-cavity defined by the coating and the active region being less than two times the bandwidth of the coating and the bandwidth of the Bragg mirror being at least as great as the free spectral range of the sub-cavity.Type: ApplicationFiled: December 13, 2000Publication date: June 13, 2002Inventors: Arnaud Garnache, Alexandre Katchanov, Frederick Stoeckel