title: Anomalous enhancement of a single high-order harmonic by using a laser-ablation tin plume at 47 nm.
abstract: We have successfully demonstrated intensity enhancement of a single high-order harmonic at a wavelength of 46.76 nm by using low-ionized tin ions in a laser-ablation plume as the nonlinear medium. The ablation plume was produced by irradiating a solid tin target with a 10 mJ energy picosecond laser pulse. Strong 17th-harmonic generation at a wavelength of 46.76 nm was observed with a conversion efficiency of about 10(-4). We attribute the strong enhancement of the single high-order harmonic to multiphoton resonance with a strong radiative transition of the Sn II ion.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, Chiba, Japan. msuzuki@issp.u-tokyo.ac.jp
authors.forename: Masayuki
authors.initials: M
authors.lastname: Suzuki
authors.forename: Motoyoshi
authors.initials: M
authors.lastname: Baba
authors.forename: Rashid
authors.initials: R
authors.lastname: Ganeev
authors.forename: Hiroto
authors.initials: H
authors.lastname: Kuroda
authors.forename: Tsuneyuki
authors.initials: T
authors.lastname: Ozaki