Author(s) Kifle, E.; Loiko, P.; Romero, C.; de Aldana, J.Rodríguez; Ródenas, A.; Jambunathan, V.; Zakharov, V.; Veniaminov, A.; Lucianetti, A.; Mocek, T.; Aguiló, M.; Díaz, F.; Griebner, U.; Petrov, V.; Mateos, X.
Journal Opt Express
Date Published 2018 Nov 12

We report on the first erbium (Er) doped double tungstate waveguide laser. As a gain material, we studied a monoclinic Er:KLu(WO) crystal. A depressed-index buried channel waveguide formed by a 60 µm-diameter circular cladding was fabricated by 3D femtosecond direct laser writing. The waveguide was characterized by confocal laser microscopy, µ-Raman and µ-luminescence mapping, confirming that the crystallinity of the core is preserved. The waveguide laser, diode pumped at 981 nm, generated 8.9 mW at 1533.6 nm with a slope efficiency of 20.9% in the continuous-wave regime. The laser polarization was linear (E || N). The laser threshold was at 93 mW of absorbed pump power.

DOI 10.1364/OE.26.030826
ISSN 1094-4087
Citation Opt Express. 2018;26(23):3082630836.

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