title: High-power and highly efficient diode-cladding-pumped Ho3+-doped silica fiber lasers.
abstract: We demonstrate high-power operation from a singly Ho3+-doped silica fiber laser that is cladding pumped directly with diode lasers operating at 1150 nm. Internal slope efficiencies approaching the Stokes limit were produced, and the maximum output power was 2.2W. This result was achieved using a low Ho3+-ion concentration and La3+-ion codoping, which together limit the transfer of energy between excited Ho3+ ions.
authors.affiliation: Optical Fibre Technology Centre, University of Sydney, 206 National Innovation Centre, Australian Technology Park, Eveleigh 1430, 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