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Title3.42 µm lasing in heavily-erbium-doped fluoride fibers.
Publication TypeJournal Article
Year of Publication2019
AuthorsMaes, Frédéric, Christoph Stihler, Louis-Philippe Pleau, Vincent Fortin, Jens Limpert, Martin Bernier, and Réal Vallée
JournalOpt Express
Volume27
Issue3
Pagination2170-2183
Date Published2019 Feb 04
ISSN1094-4087
Abstract

In this paper, we investigate laser emission at 3.4μm in heavily-erbium-doped fluoride fibers using dual-wavelength pumping. To this extent, a monolithic 7 mol% erbium-doped fluoride fiber laser bounded by intracore fiber Bragg gratings at 3.42 μm is used to demonstrate a record efficiency of 38.6 % with respect to the 1976 nm pump. Through numerical modeling, we show that similar laser performances at 3.4 μm can be expected in fluoride fibers with erbium concentrations ranging between 1 - 7 mol%, although power scaling should rely on lightly-doped fibers to mitigate the heat load. Moreover, this work studies transverse mode-beating of the 1976 nm core pump and its role in the generation of a periodic luminescent grating and in the trapping of excitation in the metastable energy levels of the erbium system. Finally, we also report on the bistability of the 3.42 μm output power of the 7 mol% erbium-doped fluoride fiber laser.

DOI10.1364/OE.27.002170
Alternate JournalOpt Express
PubMed ID30732258