title: Ionization of noble gases with pulses directly from a laser oscillator.
abstract: A Ti:sapphire oscillator with an extended cavity generates pulses with 0.5 microJ energy at a repetition rate of 6 MHz and pulse durations of 50 fs. Tight focusing creates peak intensities exceeding 10(14) W/cm2, which is sufficient for ionizing helium, a nonlinear process where at least 17 photons are absorbed simultaneously.
authors.affiliation: Max-Planck-Institut für Kernphysik, saupfercheckweg, Heidelberg, Germany. sebastian.dewald@mpi-hd.mpg.de
authors.forename: S
authors.initials: S
authors.lastname: Dewald
authors.forename: T
authors.initials: T
authors.lastname: Lang
authors.forename: C D
authors.initials: CD
authors.lastname: Schröter
authors.forename: R
authors.initials: R
authors.lastname: Moshammer
authors.forename: J
authors.initials: J
authors.lastname: Ullrich
authors.forename: M
authors.initials: M
authors.lastname: Siegel
authors.forename: U
authors.initials: U
authors.lastname: Morgner