Patents by Inventor Christoph STIHLER

Christoph STIHLER 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).

  • Avoiding mode instability in an optical amplifier fiber
    Patent number: 11381054
    Abstract: The invention relates to a method for stably transmitting laser radiation through an optical waveguide (3), wherein two or more modes of the laser radiation propagating in the optical waveguide (3) interfere and form a mode interference pattern in the optical waveguide, as a result of which a thermally induced refractive index grating is produced in the optical waveguide (3). It is an object of the invention to demonstrate an effective approach for stabilizing the output signal of the optical waveguide (3) in a fiber-based laser/amplifier combination at high output powers, i.e. for avoiding mode instability. The invention achieves this object by virtue of the fact that a relative spatial phase shift between the mode interference pattern and the thermally induced refractive index grating is set in the direction of propagation of the laser radiation.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: July 5, 2022
    Assignees: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Friedrich-Schiller-Universität Jena
    Inventors: Christoph Stihler, César Jáuregui Misas, Jens Limpert, Andreas Tünnermann
  • AVOIDING MODE INSTABILITY IN AN OPTICAL AMPLIFIER FIBER
    Publication number: 20200153190
    Abstract: The invention relates to a method for stably transmitting laser radiation through an optical waveguide (3), wherein two or more modes of the laser radiation propagating in the optical waveguide (3) interfere and form a mode interference pattern in the optical waveguide, as a result of which a thermally induced refractive index grating is produced in the optical waveguide (3). It is an object of the invention to demonstrate an effective approach for stabilizing the output signal of the optical waveguide (3) in a fiber-based laser/amplifier combination at high output powers, i.e. for avoiding mode instability. The invention achieves this object by virtue of the fact that a relative spatial phase shift between the mode interference pattern and the thermally induced refractive index grating is set in the direction of propagation of the laser radiation.
    Type: Application
    Filed: July 17, 2018
    Publication date: May 14, 2020
    Applicants: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung E.V., Friedrich-Schiller-Universität Jena
    Inventors: Christoph STIHLER, César JÁUREGUI MISAS, Jens LIMPERT, Andreas TÜNNERMANN
  • Active stabilization of mode instabilities in optical waveguides
    Patent number: 10490969
    Abstract: A method of propagating a laser signal through an optical waveguide and a waveguide laser system provide a novel way of stabilizing the beam emitted by a fiber laser system above the mode instability threshold wherein the beat length of two or more interfering transverse modes of the laser signal in the optical waveguide is modulated in time.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: November 26, 2019
    Assignees: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e. V., Friedrich-Schiller-Universitaet Jena
    Inventors: Christoph Stihler, César Jáuregui Misas, Jens Limpert, Hans-Juergen Otto, Andreas Tuennermann, Fabian Stutzki
  • ACTIVE STABILIZATION OF MODE INSTABILITIES IN OPTICAL WAVEGUIDES
    Publication number: 20180019566
    Abstract: A method of propagating a laser signal through an optical waveguide and a waveguide laser system provide a novel way of stabilizing the beam emitted by a fiber laser system above the mode instability threshold wherein the beat length of two or more interfering transverse modes of the laser signal in the optical waveguide is modulated in time.
    Type: Application
    Filed: July 14, 2017
    Publication date: January 18, 2018
    Applicants: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e. V., Friedrich-Schiller-Universitaet Jena
    Inventors: Christoph STIHLER, César JÁUREGUI MISAS, Jens LIMPERT, Hans-Juergen OTTO, Andreas TUENNERMANN, Fabian STUTZKI