title: High-order harmonic generation from boron plasma in the extreme-ultraviolet range.
abstract: We demonstrate the generation of up to the 63rd harmonic (lambda = 12.6 nm) of a Ti:sapphire laser pulse (150 fs, 10 mJ), using a prepulse- (210-ps,24-mJ) produced boron plasma as the nonlinear medium. The influence of various parameters on the harmonic conversion efficiency was analyzed. The steep decrease in intensity for low-order harmonics (up to 19th order) was followed by a plateau. Typical conversion efficiencies were evaluated to be 10(-4) (for a 3rd harmonic) to 10(-7) (within the plateau region). Harmonic generation appeared to be efficient for the plasma that comprised neutral atoms and singly ionized boron.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan. r_ganeev@issp.u-tokyo.ac.jp
authors.forename: Rashid
authors.initials: R
authors.lastname: Ganeev
authors.forename: Masayuki
authors.initials: M
authors.lastname: Suzuki
authors.forename: Motoyoshi
authors.initials: M
authors.lastname: Baba
authors.forename: Hiroto
authors.initials: H
authors.lastname: Kuroda
authors.forename: Tsuneyuki
authors.initials: T
authors.lastname: Ozaki