title: Absolute extreme ultraviolet yield from femtosecond-laser-excited Xe clusters.
abstract: Large Xe clusters (10(5)-10(6) atoms per cluster) have been irradiated with ultrashort (50 fs) and high-intensity ( approximately 2 x 10(18) W/cm(2)) pulses from a Ti:sapphire multi-TW laser at 800 nm wavelength. Scaling and absolute yield measurements of extreme ultraviolet (EUV) emission in a wavelength range between 7 and 15 nm in combination with cluster target characterization have been used for yield optimization. Maximum emission as a function of the backing pressure and a spatial emission anisotropy covering a factor of two at optimized yields is discussed with a simple model of the source geometry and EUV-radiation absorption. Circularly polarized laser light instead of linear polarization results in a factor of 2.5 higher emission in the 11 to 15 nm wavelength range. This indicates the initial influence of optical-field ionization for the interaction parameter range used and contrasts to collisional heating that seems to influence preferentially higher ionization. Absolute emission efficiency at 13.4 nm of up to 0.5% in 2pi sr and 2.2% bandwidth has been obtained.
authors.affiliation: Max-Born-Institut, Max-Born-Strasse 2a, D-12489 Berlin, Germany and Institute for Physical Research, Ashtarak-2, 378410, Armenia.
authors.forename: S
authors.initials: S
authors.lastname: Ter-Avetisyan
authors.forename: M
authors.initials: M
authors.lastname: Schnürer
authors.forename: H
authors.initials: H
authors.lastname: Stiel
authors.forename: U
authors.initials: U
authors.lastname: Vogt
authors.forename: W
authors.initials: W
authors.lastname: Radloff
authors.forename: W
authors.initials: W
authors.lastname: Karpov
authors.forename: W
authors.initials: W
authors.lastname: Sandner
authors.forename: P V
authors.initials: PV
authors.lastname: Nickles
mesh_terms: D016880:Anisotropy; D007477:Ions; D007834:Lasers; D055585:Physical Phenomena; D010825:Physics; D011312:Pressure; D013997:Time Factors; D014466:Ultraviolet Rays; D014978:Xenon
chemical_list: D007477:Ions; D014978:Xenon