title: High-power and highly efficient Tm3+-doped silica fiber lasers pumped with diode lasers operating at 1150 nm.
abstract: An output power of 1.74 W at 2.03 microm was generated at a slope efficiency of 51% when a double-clad Tm(3+)-doped silica fiber laser was pumped with high-power 1150 nm diode lasers. Pump excited state absorption from the upper laser level populates higher energy levels allowing cross relaxation to repopulate the upper laser level at a quantum efficiency greater than unity and to limit losses relating to additional pump excited state absorption. The output power was scaled to 4.77 W when both ends of the fiber were pumped.
authors.affiliation: Optical Fibre Technology Centre, Univesity of Sydney, Australia. s.jackson@oftc.usyd.edu.au
authors.forename: Stuart D
authors.initials: SD
authors.lastname: Jackson
authors.forename: Frank
authors.initials: F
authors.lastname: Bugge
authors.forename: Götz
authors.initials: G
authors.lastname: Erbert