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

Identifier:  imarina:4123864

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

Authors:  Kifle, E; Loiko, P; Romero, C; de Aldana, JRV; Ródenas, A; Jambunathan, V; Zakharov, V; Veniaminov, A; Lucianetti, A; Mocek, T; Aguiló, M; Díaz, F; Griebner, U; Petrov, V; Mateos, X

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.