title: Thulium channel waveguide laser in a monoclinic double tungstate with 70% slope efficiency.
abstract: Laser experiments were performed on buried, ridge-type channel waveguides in an 8 at. % thulium-doped, yttrium-gadolinium-lutetium codoped monoclinic double tungstate. A maximum slope efficiency of 70% and output powers up to 300 mW about 2.0 μm were obtained in a mirrorless laser resonator, by pumping with a Ti:sapphire laser near 800 nm. To the best of our knowledge, this result represents the most efficient 2 μm channel waveguide laser to date. Lasing is obtained at various wavelengths between 1810 nm and 2037 nm.
authors.affiliation: Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands. k.vandalfsen@utwente.nl
authors.forename: K
authors.initials: K
authors.lastname: van Dalfsen
authors.forename: S
authors.initials: S
authors.lastname: Aravazhi
authors.forename: C
authors.initials: C
authors.lastname: Grivas
authors.forename: S M
authors.initials: SM
authors.lastname: García-Blanco
authors.forename: M
authors.initials: M
authors.lastname: Pollnau
mesh_terms: D000042:Absorption; D007834:Lasers; D013932:Thulium / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*
chemical_list: D017973:Tungsten Compounds; D013932:Thulium; C045951:tungstate