Fs-laser-written erbium-doped double tungstate waveguide laser

Identifier:  imarina:4123864

Handle: https://hdl.handle.net/20.500.11797/imarina4123864

Authors:  Kifle, Esrom; Loiko, Pavel; Romero, Carolina; Vazquez de Aldana, Javier Rodriguez; Rodenas, Airan; Jambunathan, Venkatesan; Zakharov, Viktor; Veniaminov, Andrey; Lucianetti, Antonio; Mocek, Tomas; Aguilo, Magdalena; Diaz, Francesc; Griebner, Uwe; Petrov, Valentin; Mateos, Xavier

Abstract:
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. : We report on the first erbium (Er3+) doped double tungstate waveguide laser. As a gain material, we studied a monoclinic Er3+:KLu(WO4)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 || Nm). The laser threshold was at 93 mW of absorbed pump power.