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

Identifier:  PC:3402

Handle: https://hdl.handle.net/20.500.11797/PC3402

Authors:  Aguiló, M.; KIFLE, E.; LOIKO, P.; ROMERO, C.; RODRÍGUEZ, J.; RÓDENAS, A.; JAMBUNATHAN, V.; ZAKHAROV, V.; VENIAMINOV, A.; LUCIANETTI, A.; MOCEK, T.; Díaz, F.; GRIEBNER, U; Petrov, V.; Mateos, X.

Abstract:
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 ¿m-diameter circular cladding was fabricated by 3D femtosecond direct laser writing. The waveguide was characterized by confocal laser microscopy, ¿-Raman and ¿-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