Open AccessFs-laser-written erbium-doped double tungstate waveguide laser
Author(s) -
Esrom Kifle,
Pavel Loiko,
Carolina Romero,
Javier R. Vázquez de Aldana,
Airán Ródenas,
Venkatesan Jambunathan,
V. K. Zakharov,
А. В. Вениаминов,
Antonio Lucianetti,
Tomáš Mocek,
Magdalena Aguiló,
Francesc Díaz,
Uwe Griebner,
Valentín Petrov,
Xavier Mateos
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.030826
Subject(s) - materials science , laser , optics , slope efficiency , femtosecond , tungstate , waveguide , optoelectronics , cladding (metalworking) , laser power scaling , erbium , fiber laser , doping , physics , metallurgy
We report on the first erbium (Er 3+ ) doped double tungstate waveguide laser. As a gain material, we studied a monoclinic Er 3+ :KLu(WO 4 ) 2 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 m ). The laser threshold was at 93 mW of absorbed pump power.