title: Dramatic enhancement of high-order harmonic generation.
abstract: We present a dramatic enhancement [Phys. Rev. Lett. 91, 043002 (2003)] of high-order harmonic generation by simultaneous irradiation of booster harmonics. A key feature of our experiment is the use of mixed gases (Xe and He) with different ionization energies. The harmonics from Xe atoms act as a booster to increase the harmonic yield from He by a factor of 4 x 10(3). The dominance of the dramatic enhancement effect is supported by simulation with the time-dependent Schrödinger equation as well as the observed spatial characteristic of the generated harmonics and dependence on medium conditions.
authors.affiliation: Laser Technology Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. ejtak@riken.jp
authors.forename: Eiji J
authors.initials: EJ
authors.lastname: Takahashi
authors.forename: Tsuneto
authors.initials: T
authors.lastname: Kanai
authors.forename: Kenichi L
authors.initials: KL
authors.lastname: Ishikawa
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Nabekawa
authors.forename: Katsumi
authors.initials: K
authors.lastname: Midorikawa