Dramatic Enhancement of High-Order Harmonic Generation
Eiji J. TakahashiLaser Technology Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, JapanTsuneto KanaiLaser Technology Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, JapanKenichi L. IshikawaDepartment of Quantum Engineering and Systems Science, Graduate School of Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, JapanYasuo NabekawaLaser Technology Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, JapanKatsumi MidorikawaLaser Technology Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
2007en
ABI
Аннотация
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 $4\ifmmode\times\else\texttimes\fi{}{10}^{3}$. The dominance of the dramatic enhancement effect is supported by simulation with the time-dependent Schr\"odinger equation as well as the observed spatial characteristic of the generated harmonics and dependence on medium conditions.
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