Patents by Inventor Francois Légaré

Francois Légaré 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).

  • Publication number: 20230283917
    Abstract: A method and a system for imaging a dynamic scene, by time-spectrum mapping when a single chirped pulse probes the dynamic scene, storing temporal information at different wavelengths, spectral shearing, spatial encoding and reverse spectral shearing; spatiotemporal integration; and image reconstruction from a resulting captured snapshot, using a laser source configured to emit a linearly chirped laser probe pulse; an imaging unit; a shearing and reversing shearing unit; an encoder; a detector; and a computer; wherein the imaging unit is configured to record the linearly chirped laser probe pulse transmitted by the dynamic scene in a snapshot; the shearing and reversing shearing unit is configured to spectrally shears the linearly chirped laser pulses received from the imaging unit to the encoder, the detector records a compressed snapshot of a temporal information of the dynamic scene read out by the probe pulse; and the computer processes the snapshot and yields a(x,y,t) datacube of the dynamic scene.
    Type: Application
    Filed: February 17, 2023
    Publication date: September 7, 2023
    Inventors: Jinyang LIANG, François LÉGARÉ, Jingdan LIU, Heide IBRAHIM, Xianglei LIU, Yingming LAI
  • Publication number: 20230261429
    Abstract: There is provided an ultrafast laser source and a method for fabrication thereof, the system comprising a waveguide module and a compression module, wherein the waveguide module generates pulses of multidimensional solitary states from ultra-short-laser pulses and the compression module compresses the pulses of multidimensional solitary states at the output of the waveguide module, the method comprising generating pulses of multidimensional solitary states from ultrashort laser pulses; and compressing the pulses of multidimensional solitary states.
    Type: Application
    Filed: June 7, 2021
    Publication date: August 17, 2023
    Inventors: François LÉGARÉ, Reza Safaei MOHAMMADABADI, Guangyu FAN
  • Publication number: 20230028731
    Abstract: A method and a system for measuring carrier-to-envelope phase fluctuations (CEP) fluctuations of a laser field, the method comprising focusing laser pulses in a solid-state material for high harmonic generation, collecting a resulting high harmonic spectrum, and inferring a relative phase of the driving field from the high harmonic spectrum. The system comprises a source of CEP stable mid-infrared laser pulses; a CEP variation unit; a solid state medium; a detector; and first focusing optics focusing pulses generated by the source into the solid state medium and second focusing optics collecting resulting harmonics generated in the solid state medium into the detector.
    Type: Application
    Filed: December 9, 2020
    Publication date: January 26, 2023
    Inventors: ADRIEN LEBLANC, PHILIPPE LASSONDE, FRANCOIS LEGARE
  • Patent number: 11415461
    Abstract: A method comprising forming a linear temporal non-stationary amplitude filter by interacting a high intensity ultrashort laser pump pulse with a photo-excitable material, focusing an ultrashort broadband laser probe pulse over the photo-excited material, acquiring a two-dimensional spectrogram and retrieving amplitudes and phases of both temporal probe pulse and linear non-stationary amplitude filter from the two-dimensional spectrogram.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: August 16, 2022
    Inventors: Philippe Lassonde, Guilmot Ernotte, Bruno E. Schmidt, François Légaré, Stéphane Petit, Jean-Christophe Delagnes, Eric Cormier, Adrien Leblanc
  • Patent number: 11237052
    Abstract: A system and a method for infrared spectrometry, the method comprising multiphoton absorption with a material positioned in the Fourier plane of a 2f setup, the material being one of: i) a visible light sensitive, high band gap material and ii) an IR sensitive material. The system comprises one of: i) a visible light sensitive, high band gap material and ii) an IR sensitive material, positioned in the Fourier plane of a 2f setup.
    Type: Grant
    Filed: December 10, 2018
    Date of Patent: February 1, 2022
    Inventors: François Legaré, Bruno Schmidt
  • Publication number: 20210207242
    Abstract: A method and a system, the system, comprising a laser source, a ionization and acceleration unit, a separation unit, and a collecting unit, wherein the laser source comprises a large bandwidth laser delivering successive pulses of fixed central wavelength and bandwidth to a surface of a target positioned inside the ionization and acceleration unit, surface atoms of the target being ionized by the pulses, accelerated from the surface of the target to a kinetic energy in the range between 100 eV and 10 KeV, and focused to the separation unit, the separation unit separating received atoms into different ions species, and the collecting unit separately collecting the different ion species.
    Type: Application
    Filed: January 6, 2021
    Publication date: July 8, 2021
    Inventors: Stéphane PAYEUR, François LÉGARÉ, Jean-Claude KIEFFER
  • Publication number: 20200400497
    Abstract: A system and a method for infrared spectrometry, the method comprising multiphoton absorption with a material positioned in the Fourier plane of a 2f setup, the material being one of: i) a visible light sensitive, high band gap material and ii) an IR sensitive material. The system comprises one of: i) a visible light sensitive, high band gap material and ii) an IR sensitive material, positioned in the Fourier plane of a 2f setup.
    Type: Application
    Filed: December 10, 2018
    Publication date: December 24, 2020
    Inventors: François LÉGARÉ, Bruno SCHMIDT
  • Publication number: 20200278253
    Abstract: A method comprising forming a linear temporal non-stationary amplitude filter by interacting a high intensity ultrashort laser pump pulse with a photo-excitable material, focusing an ultrashort broadband laser probe pulse over the photo-excited material, acquiring a two-dimensional spectrogram and retrieving amplitudes and phases of both temporal probe pulse and linear non-stationary amplitude filter from the two-dimensional spectrogram.
    Type: Application
    Filed: September 24, 2018
    Publication date: September 3, 2020
    Inventors: Philippe Lassonde, Guilmot Ernotte, Bruno E. Schmidt, François Légaré, Stéphane Petit, Jean-Christophe Delagnes, Eric Cormier, Adrien Leblanc
  • Patent number: 10527539
    Abstract: A humidity sensing method and system comprising a transmitter, comprising a fiber optic head and a light source comprising a single LED emitting a measuring light, a receiver, and a sensing assembly comprising a plurality of optical fibers each comprising a first end fed the measuring light, a transducer positioned along a length thereof, the transducer comprising a side-polished portion of the optical fiber, the side polished portion coated with a gold layer and a film of a hydrophilic material wherein the transducer modifies an intensity of the measuring light dependent on an ambient humidity, and a second end for feeding the modified measuring light to the receiver, wherein the receiver compares an intensity of the measuring light with an intensity of the modified measuring light deriving therefrom a corresponding humidity level and dew point temperature.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: January 7, 2020
    Assignee: Institut National de la Recherche Scientifique
    Inventors: Hamid E. Limodehi, François Légaré, Mohamed Chaker
  • Publication number: 20180238791
    Abstract: A humidity sensing method and system comprising a transmitter, comprising a fiber optic head and a light source comprising a single LED emitting a measuring light, a receiver, and a sensing assembly comprising a plurality of optical fibers each comprising a first end fed the measuring light, a transducer positioned along a length thereof, the transducer comprising a side-polished portion of the optical fiber, the side polished portion coated with a gold layer and a film of a hydrophilic material wherein the transducer modifies an intensity of the measuring light dependent on an ambient humidity, and a second end for feeding the modified measuring light to the receiver, wherein the receiver compares an intensity of the measuring light with an intensity of the modified measuring light deriving therefrom a corresponding humidity level and dew point temperature.
    Type: Application
    Filed: February 23, 2018
    Publication date: August 23, 2018
    Inventors: HAMID E. LIMODEHI, FRANÇOIS LÉGARÉ, MOHAMED CHAKER
  • Patent number: 9910339
    Abstract: A method and a system for nonlinear optical interaction in a nonlinear medium, comprising interacting at least one input beam in a nonlinear medium located at a spectrally dispersed plane. The method and system allows generating output photons from input photons, the output photons having properties that linearly depend on the properties of the input photons and that are mutually independent, comprising interacting the input photons in a nonlinear medium located at a spectrally dispersed plane.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: March 6, 2018
    Assignee: INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Bruno Schmidt, François Légaré, Matteo Clerici, Heide Ibrahim
  • Publication number: 20160103384
    Abstract: A method and a system for nonlinear optical interaction in a nonlinear medium, comprising interacting at least one input beam in a nonlinear medium located at a spectrally dispersed plane. The method and system allows generating output photons from input photons, the output photons having properties that linearly depend on the properties of the input photons and that are mutually independent, comprising interacting the input photons in a nonlinear medium located at a spectrally dispersed plane.
    Type: Application
    Filed: June 25, 2014
    Publication date: April 14, 2016
    Inventors: BRUNO SCHMIDT, FRANÇOIS LÉGARÉ, MATTEO CLERICI, HEIDE IBRAHIM
  • Patent number: 9203208
    Abstract: A system and method for high power parametric amplification based on performing amplification in a frequency domain after time domain pulses are optically Fourier transformed, to overcome bandwidth limitations. In a nutshell, a first optical Fourier transformation of a seed spectrum is performed and parametric amplification is carried out in this spatially dispersed frequency plane. As a consequence, individual parts of the spectrum can be amplified using an optical amplification medium comprising a series of optical amplification units, such as different narrowband crystals, placed one next to each other. Each crystal is tuned independently to optimize its corresponding spectral slice. A second optical Fourier transformation recovers the time domain laser pulses. This method enables scalability of amplified bandwidth and pulse energy at the same time.
    Type: Grant
    Filed: August 16, 2012
    Date of Patent: December 1, 2015
    Assignee: Institut National de la Recherche Scientifique
    Inventors: Bruno E. Schmidt, Francois Legare, Heide Ibrahim
  • Publication number: 20140219300
    Abstract: A system and method for high power parametric amplification based on performing amplification in a frequency domain after time domain pulses are optically Fourier transformed, to overcome bandwidth limitations. In a nutshell, a first optical Fourier transformation of a seed spectrum is performed and parametric amplification is carried out in this spatially dispersed frequency plane. As a consequence, individual parts of the spectrum can be amplified using an optical amplification medium comprising a series of optical amplification units, such as different narrowband crystals, placed one next to each other. Each crystal is tuned independently to optimize its corresponding spectral slice. A second optical Fourier transformation recovers the time domain laser pulses. This method enables scalability of amplified bandwidth and pulse energy at the same time.
    Type: Application
    Filed: August 16, 2012
    Publication date: August 7, 2014
    Applicant: INSTITU NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Bruno E. Schimidt, Francois Legare, Heide Ibrahim
  • Patent number: 7414729
    Abstract: A system is disclosed for detecting a signal field from a sample volume. The system includes a source system and an optical fiber system. The source system provides a first electromagnetic field at a first frequency and a second electromagnetic field at a second frequency that is different from the first frequency. The optical fiber system includes at least one optical fiber for guiding the first and second electromagnetic fields to the sample volume to generate coherent radiation characteristic of molecular vibrations by non-linear interaction of the first and second fields with the sample volume. The optical fiber system also receives the signal field resulting from the coherent radiation, and guides the signal field to a detector.
    Type: Grant
    Filed: April 12, 2006
    Date of Patent: August 19, 2008
    Assignee: President and Fellows of Harvard College
    Inventors: Xiaoliang Sunney Xie, Francois Légaré, Feruz Ganikhanov, Conor Evans
  • Publication number: 20070088219
    Abstract: A system is disclosed for detecting a signal field from a sample volume. The system includes a source system and an optical fiber system. The source system provides a first electromagnetic field at a first frequency and a second electromagnetic field at a second frequency that is different from the first frequency. The optical fiber system includes at least one optical fiber for guiding the first and second electromagnetic fields to the sample volume to generate coherent radiation characteristic of molecular vibrations by non-linear interaction of the first and second fields with the sample volume. The optical fiber system also receives the signal field resulting from the coherent radiation, and guides the signal field to a detector.
    Type: Application
    Filed: April 12, 2006
    Publication date: April 19, 2007
    Inventors: Xiaoliang Xie, Francois Legare, Feruz Ganikhanov, Conor Evans