title: Directly diode-pumped holmium fiber lasers.
abstract: Sensitizer-free holmium-doped silica and fluoride mid-infrared fiber lasers are pumped using a high-power diode laser operating at 1148 nm. A maximum output power of 162 mW at 2.86 microm was produced at a slope efficiency of 24% using Ho(3+), Pr(3+)-doped fluoride fiber. Using Ho(3+)-doped silica fiber, a maximum output power of 55 mW at 2.1 microm was generated at a slope efficiency of 27%, a value limited by the presence of pump excited state absorption.
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: F
authors.initials: F
authors.lastname: Bugge
authors.forename: G
authors.initials: G
authors.lastname: Erbert