High-power thermally guiding index-antiguiding-core fibers

High-power thermally guiding index-antiguiding-core fibers

We investigate high-power operation of a very-large-mode-area (VLMA) fiber concept based on an index-antiguiding, thermally guiding core in which an ytterbium-doped region is completely surrounded by silica with a slightly higher refractive index. Experimentally, regimes of antiguidance, single-mode...

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Veröffentlicht in:Optics letters 2013-02, Vol.38 (4), p.510-512
Hauptverfasser: Jansen, Florian, Stutzki, Fabian, Otto, Hans-Jürgen, Jauregui, Cesar, Limpert, Jens, Tünnermann, Andreas
Format: Artikel
Sprache:eng
Schlagworte:
Fibers
Instability
Refractive index
Refractivity
Silicon dioxide
Stability
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Beschreibung
Zusammenfassung:We investigate high-power operation of a very-large-mode-area (VLMA) fiber concept based on an index-antiguiding, thermally guiding core in which an ytterbium-doped region is completely surrounded by silica with a slightly higher refractive index. Experimentally, regimes of antiguidance, single-mode operation, and mode instabilities predominantly with radially symmetric higher-order modes are observed. Fundamental limitations for conventional VLMA step-index fibers are discussed.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.38.000510