The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 2022
Filed:
Jul. 17, 2018
Fraunhofer-gesellschaft Zur Förderung Der Angewandten Forschung E.v., Munich, DE;
Friedrich-schiller-universität Jena, Jena, DE;
Christoph Stihler, Jena, DE;
César Jáuregui Misas, Jena, DE;
Jens Limpert, Jena, DE;
Andreas Tünnermann, Weimar, DE;
Abstract
The invention relates to a method for stably transmitting laser radiation through an optical waveguide (), wherein two or more modes of the laser radiation propagating in the optical waveguide () 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 (). It is an object of the invention to demonstrate an effective approach for stabilizing the output signal of the optical waveguide () 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. In addition, the invention relates to a laser/amplifier combination comprising a laser () and an optical waveguide () in the form of an amplifier fiber, wherein the optical waveguide () amplifies the radiation of the laser () propagating therein. The invention proposes an actuating element (), which produces a predefinable relative spatial phase shift of the mode interference pattern and of the thermally induced refractive index grating in the direction of propagation of the laser radiation.