Patents by Inventor Réal Vallée
Réal Vallée 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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Publication number: 20240069284Abstract: Mid-infrared-transparent optical fiber products with enhanced resistance to OH diffusion are disclosed, which may be used fiber laser oscillator and amplifiers systems. In one embodiment, an optical fiber product may include optical fiber configured for propagation of mid-infrared radiation toward a light-radiating endface of or coupled to the optical fiber, and a diffusion barrier disposed on the light-radiating endface and configured for allowing the mid-infrared radiation emanating from the light-radiating endface to pass therethrough and for preventing OH diffusion therethrough toward the light-radiating endface.Type: ApplicationFiled: November 6, 2023Publication date: February 29, 2024Applicant: Université LavalInventors: Martin BERNIER, Réal VALLÉE, Souleymane TOUBOU BAH, Vincent FORTIN, Frédéric MAES, Yigit Ozan AYDIN
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Patent number: 11846807Abstract: Mid-infrared-transparent optical fiber products with enhanced resistance to OH diffusion are disclosed, which may be used fiber laser oscillator and amplifiers systems. In one embodiment, an optical fiber product may include optical fiber configured for propagation of mid-infrared radiation toward a light-radiating endface of or coupled to the optical fiber, and a diffusion barrier disposed on the light-radiating endface and configured for allowing the mid-infrared radiation emanating from the light-radiating endface to pass therethrough and for preventing OH diffusion therethrough toward the light-radiating endface.Type: GrantFiled: July 2, 2020Date of Patent: December 19, 2023Assignee: Université LavalInventors: Martin Bernier, Réal Vallée, Souleymane Toubou Bah, Vincent Fortin, Frédéric Maes, Yigit Ozan Aydin
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Publication number: 20220276443Abstract: There is described a method of optically coupling a first optical fiber and a second optical fiber to one another. The method generally has a step of bringing a free end of the first optical fiber, the second optical fiber and liquid in close proximity to one another within a coupling region, the free end of the first optical fiber having a dimension below a critical dimension, the free end of the first optical fiber moving within said liquid to contact the second optical fiber along a given coupling length, said contact optically coupling the free end of the first optical fiber and the second optical fiber to one another.Type: ApplicationFiled: August 20, 2020Publication date: September 1, 2022Inventors: Charles MATTE-BRETON, Sophie LAROCHELLE, Simon DUVAL, Réal VALLÉE, Martin BERNIER
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Publication number: 20220091033Abstract: There is described a method for determining a refractive index of a medium. The method generally has providing a substrate having a surface, the surface having a first surface portion and a second surface portion spaced-apart from the first surface portion and recessed of a depth relative to the first surface portion; receiving the medium at least on the second surface portion; propagating a first optical beam towards the first surface portion and a second optical beam towards the second surface portion; collecting the first and second optical beams after said propagating and generating first and second signals being indicative of a phase of a respective one of the first and second collected optical beams; and determining a refractive index of said medium based on the first and second signals, the depth, a wavelength associated to the first and second optical beams and a refractive index of the substrate.Type: ApplicationFiled: January 30, 2020Publication date: March 24, 2022Inventors: Érik BELANGER, Pierre MARQUET, Bertrand DE DORLODOT, Réal VALLÉE
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Publication number: 20210181417Abstract: Mid-infrared-transparent optical fiber products with enhanced resistance to OH diffusion are disclosed, which may be used fiber laser oscillator and amplifiers systems. In one embodiment, an optical fiber product may include optical fiber configured for propagation of mid-infrared radiation toward a light-radiating endface of or coupled to the optical fiber, and a diffusion barrier disposed on the light-radiating endface and configured for allowing the mid-infrared radiation emanating from the light-radiating endface to pass therethrough and for preventing OH diffusion therethrough toward the light-radiating endface.Type: ApplicationFiled: July 2, 2020Publication date: June 17, 2021Applicant: Université LavalInventors: Martin BERNIER, Réal VALLÉE, Souleymane TOUBOU BAH, Vincent FORTIN, Frédéric MAES, Yigit Ozan AYDIN
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Patent number: 10845533Abstract: An optical fiber having a Bragg grating along a non-photosensitized grating region thereof and a pristine polymer coating around the grating region with the Bragg grating having been written through the polymer coating has a mechanical resistance that is greater than 20% of the mechanical resistance of an identical grating-free optical fiber.Type: GrantFiled: October 26, 2018Date of Patent: November 24, 2020Assignee: UNIVERSITÉ LAVALInventors: Martin Bernier, Réal Vallée, François Trépanier, Julien Carrier
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Publication number: 20190137685Abstract: An optical fiber having a Bragg grating along a non-photosensitized grating region thereof and a pristine polymer coating around the grating region with the Bragg grating having been written through the polymer coating has a mechanical resistance that is greater than 20% of the mechanical resistance of an identical grating-free optical fiber.Type: ApplicationFiled: October 26, 2018Publication date: May 9, 2019Inventors: Martin Bernier, Réal Vallée, François Trépanier, Julien Carrier
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Patent number: 10132994Abstract: Methods and systems for writing a Bragg grating along a grating region of an optical fiber through a polymer coating of the optical fiber are provided. A light beam of ultrafast optical pulses is impinged on the grating region, the ultrafast optical pulses being characterized by writing wavelength at the grating region to which the polymer coating is substantially transparent The light beam is diffracted through a phase mask so as to form an interference pattern defining the Bragg grating at the grating region of the optical fiber. The light beam is also focussed such that the intensity of the optical pulses is below a damage threshold within the polymer coating, and above an FBG inscription threshold within the grating region of the fiber. Optical fiber having Bragg gratings and improved mechanical are also provided.Type: GrantFiled: April 2, 2015Date of Patent: November 20, 2018Assignee: Universite LavalInventors: Martin Bernier, Réal Vallée, François Trépanier, Julien Carrier
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Patent number: 10084287Abstract: The mid-infrared laser system has an amplifier including at least one pump laser adapted to generate a pump laser beam and a length of fiber made of a low phonon energy glass and having at least one laser-active doped region between a first end and a second end, and a seed laser to generate a seed laser beam having a seed optical spectrum in the mid-infrared. The seed laser beam is launched into the first end to generate a mid-infrared laser beam outputted from the second end via stimulated emission upon pumping of the at least one laser-active doped region with the pump laser beam. When the power of the pump laser exceeds a spectrum modification threshold, the mid-infrared laser beam has an output optical spectrum being broadened relative to the seed optical spectrum.Type: GrantFiled: October 13, 2017Date of Patent: September 25, 2018Assignee: UNIVERSITÉ LAVALInventors: Martin Bernier, Réal Vallée, Vincent Fortin, Jean-Christophe Gauthier, Simon Duval
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Publication number: 20180109078Abstract: The mid-infrared laser system has an amplifier including at least one pump laser adapted to generate a pump laser beam and a length of fiber made of a low phonon energy glass and having at least one laser-active doped region between a first end and a second end, and a seed laser to generate a seed laser beam having a seed optical spectrum in the mid-infrared. The seed laser beam is launched into the first end to generate a mid-infrared laser beam outputted from the second end via stimulated emission upon pumping of the at least one laser-active doped region with the pump laser beam. When the power of the pump laser exceeds a spectrum modification threshold, the mid-infrared laser beam has an output optical spectrum being broadened relative to the seed optical spectrum.Type: ApplicationFiled: October 13, 2017Publication date: April 19, 2018Inventors: Martin BERNIER, Réal VALLÉE, Vincent FORTIN, Jean-Christophe GAUTHIER, Simon DUVAL
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Patent number: 9625713Abstract: A method for the laser reinforced direct bonding of two optical components having a respective bonding surface and a reinforced optical assembly made thereby are provided. The method includes a first step of assembling the two optical components by direct bonding of their respective bonding surface together, thereby defining a direct-bonded interface therebetween. The method further includes a second step of reinforcing the direct-bonded interface with a weld seam including at least one substantially continuous reinforcing weld line forming a closed shape enclosing a sealed direct-bonded region. Each weld line is inscribed by focusing ultrashort laser pulses at the direct-bonding interface so as to generate non-linear optical phenomena inducing a localized junction between the two optical components.Type: GrantFiled: January 10, 2012Date of Patent: April 18, 2017Assignee: Université LavalInventors: David Helie, Réal Vallee, Fabrice Lacroix
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Publication number: 20170031090Abstract: Methods and systems for writing a Bragg grating along a grating region of an optical fiber through a polymer coating of the optical fiber are provided. A light beam of ultrafast optical pulses is impinged on the grating region, the ultrafast optical pulses being characterised by writing wavelength at the grating region to which the polymer coating is substantially transparent The light beam is diffracted through a phase mask so as to form an interference pattern defining the Bragg grating at the grating region of the optical fiber. The light beam is also focussed such that the intensity of the optical pulses is below a damage threshold within the polymer coating, and above an FBG inscription threshold within the grating region of the fiber. Optical fiber having Bragg gratings and improved mechanical are also provided.Type: ApplicationFiled: April 2, 2015Publication date: February 2, 2017Inventors: Martin Bernier, Réal Vallée, François Trépanier, Julien Carrier
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Patent number: 8737780Abstract: A method for writing a Bragg grating in a glass optical waveguide is provided. Ultrafast optical pulses are generated, preferably in the femtosecond range and having a writing wavelength in the range of 300 nm to 700 nm and an intensity sufficient to induce a change of refractive index in the waveguide through densification. The optical pulses are diffracted using a phase mask, to generate an interference pattern having a pitch providing a fundamental Bragg resonance corresponding to the target wavelength to be reflected by the grating. The interference pattern is impinged on a region of the waveguide, which is heated to a temperature above a threshold and for a predetermined heating period. Advantageously, the heating step allows the reduction of photoinduced losses which would otherwise be present in the waveguiding properties of the waveguide. Optionally, gratings may be written through the polymer jacket of an optical fiber.Type: GrantFiled: June 15, 2012Date of Patent: May 27, 2014Assignee: Université LavalInventors: Real Vallee, Martin Bernier
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Publication number: 20130344302Abstract: A method for the laser reinforced direct bonding of two optical components having a respective bonding surface and a reinforced optical assembly made thereby are provided. The method includes a first step of assembling the two optical components by direct bonding of their respective bonding surface together, thereby defining a direct-bonded interface therebetween. The method further includes a second step of reinforcing the direct-bonded interface with a weld seam including at least one substantially continuous reinforcing weld line forming a dosed shape enclosing a sealed direct-bonded region. Each weld line is inscribed by focusing ultrashort laser pulses at the direct-bonding interface so as to generate non-linear optical phenomena inducing a localized junction between the two optical components.Type: ApplicationFiled: January 10, 2012Publication date: December 26, 2013Inventors: David Hélie, Réal Vallée, Fabrice Lacroix
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Patent number: 8515224Abstract: A method for writing a Bragg grating in a rare-earth doped glass optical waveguide is provided. Ultrafast optical pulses are generated, preferably in the femtosecond range and having a writing wavelength in the range of 300 nm to 700 nm and an intensity sufficient to induce a change of refractive index in the rare-earth doped glass waveguide through densification. The optical pulses are diffracted using a phase mask, to generate an interference pattern having a pitch providing a fundamental Bragg resonance corresponding to the target wavelength to be reflected by the grating. The interference pattern is impinged on a region of the rare-earth doped glass waveguide, which is heated to a temperature above a threshold of about 350° C., for a predetermined heating period. Advantageously, the heating step allows the elimination of photodarkening effects which would otherwise be present in the waveguiding properties of the waveguide.Type: GrantFiled: July 29, 2010Date of Patent: August 20, 2013Assignee: Universite LavalInventors: Real Vallee, Martin Bernier
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Publication number: 20130147071Abstract: A method for writing a Bragg grating in a glass optical waveguide is provided. Ultrafast optical pulses are generated, preferably in the femtosecond range and having a writing wavelength in the range of 300 nm to 700 nm and an intensity sufficient to induce a change of refractive index in the waveguide through densification. The optical pulses are diffracted using a phase mask, to generate an interference pattern having a pitch providing a fundamental Bragg resonance corresponding to the target wavelength to be reflected by the grating. The interference pattern is impinged on a region of the waveguide, which is heated to a temperature above a threshold and for a predetermined heating period. Advantageously, the heating step allows the reduction of photoinduced losses which would otherwise be present in the waveguiding properties of the waveguide. Optionally, gratings may be written through the polymer jacket of an optical fiber.Type: ApplicationFiled: June 15, 2012Publication date: June 13, 2013Applicant: UNIVERSITE LAVALInventors: Real Vallee, Martin Bernier
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Publication number: 20120128301Abstract: A method for writing a Bragg grating in a rare-earth doped glass optical waveguide is provided. Ultrafast optical pulses are generated, preferably in the femtosecond range and having a writing wavelength in the range of 300 nm to 700 nm and an intensity sufficient to induce a change of refractive index in the rare-earth doped glass waveguide through densification. The optical pulses are diffracted using a phase mask, to generate an interference pattern having a pitch providing a fundamental Bragg resonance corresponding to the target wavelength to be reflected by the grating. The interference pattern is impinged on a region of the rare-earth doped glass waveguide, which is heated to a temperature above a threshold of about 350° C., for a predetermined heating period. Advantageously, the heating step allows the elimination of photodarkening effects which would otherwise be present in the waveguiding properties of the waveguide.Type: ApplicationFiled: July 29, 2010Publication date: May 24, 2012Applicant: UNIVERSITE LAVALInventors: Real Vallee, Martin Bernier
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Patent number: 8078023Abstract: A system and method for permanently writing diffraction gratings in low phonon energy glass waveguides are shown. Ultrashort light pulses are generated and made to form two beams synchronously superimposed in the waveguide, therefore forming an interference pattern corresponding to the desired grating. The light pulses are focussed so that the light intensity in the waveguide exceeds a filamentation threshold. The exposure of the waveguide to these light pulses is controlled temporally and spatially in order to limit detrimental thermal effects induced by the high-intensity pulses in the glass medium of the waveguide.Type: GrantFiled: September 28, 2007Date of Patent: December 13, 2011Assignee: Universite LavalInventors: Real Vallee, Martin Bernier, Dominic Faucher
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Publication number: 20090274420Abstract: A system and method for permanently writing diffraction gratings in low phonon energy glass waveguides are shown. Ultrashort light pulses are generated and made to form two beams synchronously superimposed in the waveguide, therefore forming an interference pattern corresponding to the desired grating. The light pulses are focussed so that the light intensity in the waveguide exceeds a filamentation threshold. The exposure of the waveguide to these light pulses is controlled temporally and spatially in order to limit detrimental thermal effects induced by the high-intensity pulses in the glass medium of the waveguide.Type: ApplicationFiled: September 28, 2007Publication date: November 5, 2009Applicant: UNIVERSITE LAVALInventors: Real Vallee, Martin Bernier, Dominic Faucher
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Publication number: 20070107618Abstract: An optical mine clearance probe comprising a handle that is extended through a rod having a geometrical axis and adapted to be driven into a soil to search through it and including a first tubular part, a second part consisting of a movable rod end part including slots adapted to constitute at least two sectors and a mechanism capable of displacing the movable rod end between two extreme positions. One of the positions being one where a part of the rod end constitutes an extremity of the probe, the at least two sectors being adjacent one another in pairs and defining a conical member ending with a tip, and the other position being one in which extremities of the at least two sectors are spread apart from one another, the rod end then being of tubular shape.Type: ApplicationFiled: August 31, 2006Publication date: May 17, 2007Inventors: Fabrice Lacroix, Real Vallee