中国物理B ›› 2007, Vol. 16 ›› Issue (1): 83-87.doi: 10.1088/1009-1963/16/1/015

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High-order harmonic generation and multi-photon ionization of Na2 in laser fields

张丰收1, 肖国青2, 张艳萍3, 蒙克来3   

  1. (1)Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China;Institute of Low Energy Nuclear Physics,Beijing Normal University, Beijing 100875, China; (2)Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China;Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; (3)Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China;Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;Graduate School, Chinese Academy of Sciences, Beijing 1000
  • 收稿日期:2006-03-01 修回日期:2006-06-09 出版日期:2007-02-01 发布日期:2007-02-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10405025, 10575012 and 10435020).

High-order harmonic generation and multi-photon ionization of Na2 in laser fields

Zhang Yan-Ping(张艳萍)a)b)d)†, Zhang Feng-Shou(张丰收)a)c), Meng Ke-Lai(蒙克来)a)b)d), and Xiao Guo-Qing(肖国青)a)b)   

  1. a Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China; b Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; c Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, China; d  Graduate School, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2006-03-01 Revised:2006-06-09 Online:2007-02-01 Published:2007-02-01
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10405025, 10575012 and 10435020).

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摘要： In this paper high-order harmonic generation (HHG) spectra and the ionization probabilities of various charge states of small cluster Na2 in the multiphoton regimes are calculated by using time-dependent local density approximation (TDLDA) for one-colour (1064 nm) and two-colour (1064 nm and 532 nm) ultrashort (25 fs) laser pulses. HHG spectra of Na2 have not the large extent of plateaus due to pronounced collective effects of electron dynamics. In addition, the two-colour laser field can result in the breaking of the symmetry and generation of the even order harmonic such as the second order harmonic. The results of ionization probabilities show that a two-colour laser field can increase the ionization probability of higher charge state.

关键词: high-order harmonic spectra, ionization probabilities, TDLDA

Abstract: In this paper high-order harmonic generation (HHG) spectra and the ionization probabilities of various charge states of small cluster Na2 in the multiphoton regimes are calculated by using time-dependent local density approximation (TDLDA) for one-colour (1064 nm) and two-colour (1064 nm and 532 nm) ultrashort (25 fs) laser pulses. HHG spectra of Na2 have not the large extent of plateaus due to pronounced collective effects of electron dynamics. In addition, the two-colour laser field can result in the breaking of the symmetry and generation of the even order harmonic such as the second order harmonic. The results of ionization probabilities show that a two-colour laser field can increase the ionization probability of higher charge state.

Key words: high-order harmonic spectra, ionization probabilities, TDLDA

中图分类号:  (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

  • 33.80.Rv
36.40.Gk (Plasma and collective effects in clusters) 36.40.Vz (Optical properties of clusters) 42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)