title: Emission properties of ns and ps laser-induced soft x-ray sources using pulsed gas jets.
abstract: The influcence of the pulse duration on the emission characteristics of nearly debris-free laser-induced plasmas in the soft x-ray region (λ ≈ 1-5 nm) was investigated, using six different target gases from a pulsed jet. Compared to ns pulses of the same energy, a ps laser generates a smaller, more strongly ionized plasma, being about 10 times brighter than the ns laser plasma. Moreover, the spectra are considerably shifted towards shorter wavelengths. Electron temperatures and densities of the plasma are obtained by comparing the spectra with model calculations using a magneto-hydrodynamic code.
authors.affiliation: Laser-Laboratorium Göttingen eV, Hans-Adolf-Krebs-Weg 1, D-37077 Göttingen, Germany. matthias.mueller@llg-ev.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Müller
authors.forename: Frank-Christian
authors.initials: FC
authors.lastname: Kühl
authors.forename: Peter
authors.initials: P
authors.lastname: Großmann
authors.forename: Pavel
authors.initials: P
authors.lastname: Vrba
authors.forename: Klaus
authors.initials: K
authors.lastname: Mann
mesh_terms: D005740:Gases / Q000737:chemistry* / Q000528:radiation effects*; D007834:Lasers; D014965:X-Rays
chemical_list: D005740:Gases