Photoionization of H atoms in few-cycle laser pulses

  • X. M. Zhang
  • J. T. ZhangEmail author
  • R. X. Li
  • Q. H. Gong
  • Z. Z. Xu
Ultraintense and Ultrashort Laser Fields


Photoionization of hydrogen atoms in few-cycle laser pulses is studied numerically. The total ionization probability, the instantaneous ionization probability, and the partial ionization probabilities in a pair of opposite directions are obtained. The partial ionization probabilities are not always equal to each other which is termed as inversion asymmetry. The variation of asymmetry degree with the CE phase, the pulse duration and the pulse intensity is studied. It is found that the pulse intensity affects the asymmetry degree in many aspects. Firstly, the asymmetry is more distinct at higher intensities than that at lower intensities when the pulse duration exceeds 4 cycles; secondly, the maximal asymmetry in lower intensities varies with the CE phase visibly while at higher intensities not; thirdly, the partial ionization probabilities equal to each other for some special CE phases. For lower pulse intensities, the corresponding value of CE phase is always 0.5π and 1.5π, while for higher pulse intensities, the corresponding value varies with the pulse intensity. Similar phenomena were observed in a recent experiment using few-cycle radio-frequency (RF) pulses.


Hydrogen Atom Lower Intensity Pulse Duration Recent Experiment Quantum Computing 
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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  • X. M. Zhang
    • 1
  • J. T. Zhang
    • 2
    • 3
    Email author
  • R. X. Li
    • 3
  • Q. H. Gong
    • 1
  • Z. Z. Xu
    • 1
    • 3
  1. 1.Department of Physics, Peking UniversityState Key Laboratory for Mesoscopic PhysicsBeijingP.R. China
  2. 2.CCAST (World Laboratory)BeijingP.R. China
  3. 3.State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of SciencesShanghaiP.R. China

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