title: Superbroadband fluorescence fiber fabricated with granulated oxides.
abstract: We demonstrate a single-core multiply doped fiber that, when pumped with a single pump source of approximately 800 nm, emits a more than two-octaves-spanning fluorescence spectrum ranging from 365 to 2300 nm. The fiber preform is manufactured from granulated oxides, and the core is doped with five different rare earths. At a pump power of 250 mW the total emitted power is 34 microW; given a core diameter of 6.5 microm and a numerical aperture of 0.1, the radiance exceeds 3 kW sr(-1) cm(-2). We also demonstrate direct diode pumping of the fiber.
authors.affiliation: Institute of Applied Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland. oredana.dilabio@iap.unibe.ch
authors.forename: Loredana
authors.initials: L
authors.lastname: Di Labio
authors.forename: Willy
authors.initials: W
authors.lastname: Lüthy
authors.forename: Valerio
authors.initials: V
authors.lastname: Romano
authors.forename: Frédéric
authors.initials: F
authors.lastname: Sandoz
authors.forename: Thomas
authors.initials: T
authors.lastname: Feurer