Author(s) Loiko, P.; Soulard, R.; Kifle, E.; Guillemot, L.; Brasse, G.; Benayad, A.; Doualan, J.L.; Braud, A.; Aguiló, M.; Díaz, F.; Mateos, X.; Camy, P.
Journal Opt Express
Date Published 2019 Apr 29

Calcium fluoride is a well-known material for optical components. It is also suited for doping with rare-earth ions, e.g., ytterbium ones. Yb:CaF is an efficient gain medium for high-power and ultrashort-pulse bulk lasers around 1 μm. We report on the first Yb:CaF planar waveguide laser. High-optical-quality single-crystalline waveguiding Yb:CaF thin films are grown on bulk CaF substrates by Liquid Phase Epitaxy. The spectroscopic study indicates the predominant coordination of isolated Yb ions in trigonal oxygen-assisted sites, C(T). The optical gain in Yb:CaF waveguide is demonstrated. A 1.4 at.% Yb:CaF planar waveguide laser generated 114 mW at 1037 nm with a slope efficiency of 12.9%. Yb:CaF films are promising for power-scalable waveguide mode-locked lasers and amplifiers.

DOI 10.1364/OE.27.012647
ISSN 1094-4087
Citation Opt Express. 2019;27(9):1264712658.

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