title: Waveguide lasers in ytterbium-doped tantalum pentoxide on silicon.
abstract: A waveguide laser in an ytterbium-doped tantalum pentoxide film is reported. The waveguide is formed of a rib of sputtered tantalum pentoxide on top of oxidized silicon with an over-cladding of silica. Emission at a wavelength of 1025 nm was achieved with an absorbed pump power threshold and slope efficiency of ≈29  mW and 27%, respectively, for a cavity formed by a high reflector mirror and an estimated 12% Fresnel reflection from the bare end-face at the output.
authors.forename: A
authors.initials: A
authors.lastname: Aghajani
authors.forename: G S
authors.initials: GS
authors.lastname: Murugan
authors.forename: N P
authors.initials: NP
authors.lastname: Sessions
authors.forename: V
authors.initials: V
authors.lastname: Apostolopoulos
authors.forename: J S
authors.initials: JS
authors.lastname: Wilkinson