title: Extreme supercontinuum generation to the deep UV.
abstract: We report the formation of an ultrabroad supercontinuum down to 280 nm in the deep UV by pumping sharply tapered (5-30 mm taper lengths) solid-core photonic crystal fibers with 130 fs, 2 nJ pulses at 800 nm. The taper moves the point of soliton fission to a position where the core is narrower, a process that requires normal dispersion at the input face of the fiber. We find that the generation of deep-UV radiation is limited by strong two-photon absorption in the silica.
authors.affiliation: Max Planck Institute for the Science of Light, Günther-Scharowsky-Strasse 1, 91058 Erlangen, Germany.
authors.forename: S P
authors.initials: SP
authors.lastname: Stark
authors.forename: J C
authors.initials: JC
authors.lastname: Travers
authors.forename: P St J
authors.initials: PS
authors.lastname: Russell