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

Friedrich-Schiller-Universitaet Jena

Friedrich-Schiller-Universitat Jena

César Jauregui Misas

Jens Limpert

Andreas Tuennermann

Andreas Tünnermann

Florian Jansen

Fabian Stutzki

Dirk Nodop

Christoph Jocher

The invention relates to an apparatus for generating azimuthally or radially polarized radiation by means of an optical waveguide (), wherein the optical waveguide () has a structure which is suitable for conducting azimuthally or radially polarized modes (). The invention proposes that the azimuthally or radially polarized modes () in the optical waveguide () have different effective refractive indices and, within the optical waveguide (), a narrow-band grating () is arranged, in particular a fiber Bragg grating () which is designed such that the spectral distance between two azimuthally or radially polarized resonant modes () is equal to or greater than the associated spectral bandwidth.

Generation of azimuthally or radially polarized radiation in optical waveguides

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 an apparatus for generation of electromagnetic radiation, having a pump light source that emits an excitation radiation at a first wavelength, and having an optical waveguide that generates frequency-converted radiation at a second and a third wavelength, by means of degenerate wave mixing, from the excitation radiation of the pump light source.

Efficient frequency conversion

Growing community of inventors

Jena, Germany

César Jauregui Misas