title: Demonstration of a spatial filtering amplifier for high-order harmonics.
abstract: We report what is to our knowledge the first demonstration of spatial filtering of a high-order harmonic beam into a soft-x-ray laser plasma amplifier at 32.8 nm. After amplification the seed energy is enhanced by a factor of 50, and the beam profile of the amplified beam exhibits an Airy-like shape due to the spatial filtering by the optical field ionized plasma. Moreover, the transverse coherence of the spatially filtered amplified beam is strongly enhanced, resulting in the generation of a peak coherent power of 0.9 x 10(5) to 1.8 x 10(5) W.
authors.affiliation: Laboratoire d'Optique Appliquée (LOA), ENSTA-Ecole Polytechnique, Chemin de la Huniére, Palaiseau, France. jean-phillippe.goddet@ensta.fr
authors.forename: J Ph
authors.initials: JP
authors.lastname: Goddet
authors.forename: S
authors.initials: S
authors.lastname: Sebban
authors.forename: A S
authors.initials: AS
authors.lastname: Morlens
authors.forename: J
authors.initials: J
authors.lastname: Gautier
authors.forename: J Ph
authors.initials: JP
authors.lastname: Rousseau
authors.forename: F
authors.initials: F
authors.lastname: Burgy
authors.forename: Ph
authors.initials: P
authors.lastname: Zeitoun
authors.forename: C
authors.initials: C
authors.lastname: Valentin
authors.forename: C
authors.initials: C
authors.lastname: Hauri
authors.forename: G
authors.initials: G
authors.lastname: Maynard
authors.forename: A
authors.initials: A
authors.lastname: Boudaa
authors.forename: J P
authors.initials: JP
authors.lastname: Caumes
authors.forename: H
authors.initials: H
authors.lastname: Merdji
authors.forename: T
authors.initials: T
authors.lastname: Mocek
authors.forename: M
authors.initials: M
authors.lastname: Kozlova
authors.forename: K
authors.initials: K
authors.lastname: Jakubczak