中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4807-4814.doi: 10.1088/1674-1056/18/11/033

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Ionization of atoms by chirped attosecond pulses

谭放, 彭良友, 龚旗煌   

  1. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2008-12-19 修回日期:2009-03-23 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10704003 and 10821062) and the National Basic Research Program of China (Grant No 2006CB806007).

Ionization of atoms by chirped attosecond pulses

Tan Fang(谭放), Peng Liang-You(彭良友)†, and Gong Qi-Huang(龚旗煌)‡   

  1. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China
  • Received:2008-12-19 Revised:2009-03-23 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10704003 and 10821062) and the National Basic Research Program of China (Grant No 2006CB806007).

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摘要： We investigate the ionization dynamics of atoms by chirped attosecond pulses using the strong field approximation method. The pulse parameters are carefully chosen in the regime where the strong field approximation method is valid. We analyse the effects of the chirp of attosecond pulses on the energy distributions and the corresponding left-right asymmetry of the ionized electrons. For a single chirped attosecond pulse, the ionized electrons can be redistributed and the left-right asymmetry shows oscillations because of the introduction of the chirp. For time-delayed double attosecond pulses at different intensities with the weaker one chirped, exchanging the order of the two pulses shows a relative shift of the energy spectra, which can be explained by the different effective time delays of different frequency components because of the chirp.

Abstract: We investigate the ionization dynamics of atoms by chirped attosecond pulses using the strong field approximation method. The pulse parameters are carefully chosen in the regime where the strong field approximation method is valid. We analyse the effects of the chirp of attosecond pulses on the energy distributions and the corresponding left-right asymmetry of the ionized electrons. For a single chirped attosecond pulse, the ionized electrons can be redistributed and the left-right asymmetry shows oscillations because of the introduction of the chirp. For time-delayed double attosecond pulses at different intensities with the weaker one chirped, exchanging the order of the two pulses shows a relative shift of the energy spectra, which can be explained by the different effective time delays of different frequency components because of the chirp.

Key words: photoionization rate, attosecond pulse, asymmetry, chirp

中图分类号:  (Photoionization of atoms and ions)

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