Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Friedrich-schiller-universitaet Jena

Friedrich-schiller-universitat Jena

Fabian Stutzki

Jens Limpert

Andreas Tuennermann

César Jáuregui Misas

Florian Jansen

Jens Ulrich Thomas

Andreas Tünnermann

Stefan Nolte

Tino Eidam

César Jauregui Misas

Christian Voigtlaender

Christoph Stihler

Hans-Jürgen Otto

Christian Voigtländer

Hans-Juergen Otto

César Misas Jauregui

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.

Active stabilization of mode instabilities in optical waveguides

The invention relates to a method and corresponding devices for reducing mode instability in an optical waveguide (), a light signal becoming unstable in the optical waveguide () beyond an output power threshold and energy being transformed from a basic mode into higher order modes. The invention proposes a reduction in temperature variation () along the optical waveguide () and/or a reduction in changes in the optical waveguide () that are caused by spatial temperature variation as a result of mode interference.

Method and device for reducing mode instability in an optical waveguide

The invention relates to a double-sheath fiber having a core region () and a sheath region, the sheath region having an inner region () and an outer region (), which comprises a refractive index that is lower with respect to that of the inner region () and the core region (), wherein the outer region () surrounds the inner region (). The invention proposes an internal structure () of the inner region () which effects a spatial overlap of modes of higher order with the core region (), which is lower than the spatial overlap of a fundamental mode with the core region ().

Structured double-sheath fiber

The invention relates to a transverse mode filter in an optical waveguide (). The aim of the invention is to produce a transverse mode filter that permits a monolithic construction of a laser in a multi-mode waveguide. To achieve this, according to the invention the filter comprises a Fabry-Perot cavity integrated into the optical waveguide () and comprising two reflective elements () situated at a distance from one another. In addition, the waveguide () is modified in the region of the Fabry-Perot cavity and/or in the region of the reflective elements () in relation to the remaining regions of the waveguide with respect to the effective refractive index of at least one mode of the waveguide.

Transverse mode filter for waveguides

Growing community of inventors

Jena, Germany

Fabian Stutzki