Journal
OPTICS EXPRESS
Volume 27, Issue 3, Pages 2170-2183Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.002170
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Funding
- Canada Foundation for Innovation (CFI) [5180]
- Fonds de Recherche du Quebec-Nature et Technologies (FRQNT) [144616]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [IRCPJ469414-13]
- Deutsche Forschungsgemeinschaft (DFG) [IRTG 2101]
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In this paper, we investigate laser emission at 3.4 mu m 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 mu m 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 mu m 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 mu m output power of the 7 mol% erbium-doped fluoride fiber laser. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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