title: Strong resonance enhancement of a single harmonic generated in the extreme ultraviolet range.
abstract: We report the demonstration of strong resonance enhancement of a single high-order harmonic in the extreme ultraviolet (XUV) region generated from the interaction of a femtosecond pulse with low-ionized In ablation. A strong 13th harmonic (61.2 nm) of Ti:sapphire laser radiation with output intensity almost two orders of magnitude higher than neighboring harmonics was observed in these studies. The high conversion efficiency of the 13th harmonic (8 x 10(-5)) is attributed to multiple collisions of electron trajectories with the origin due to multiphoton resonance with the In ion.
authors: The Institute for Solid State Physics, University of Tokyo, Chiba, Japan. rashid_ganeev@yahoo.com
authors: Rashid A
authors: RA
authors: Ganeev
authors: Masayuki
authors: M
authors: Suzuki
authors: Motoyoshi
authors: M
authors: Baba
authors: Hiroto
authors: H
authors: Kuroda
authors: Tsuneyuki
authors: T
authors: Ozaki