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Chin. Phys., 2007, Vol. 16(1): 83-87    DOI: 10.1088/1009-1963/16/1/015
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

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

Zhang Feng-Shoua, Xiao Guo-Qingb, Zhang Yan-Pingc, Meng Ke-Laic
a 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; b 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; c 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
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.
Keywords:  high-order harmonic spectra      ionization probabilities      TDLDA     
Received:  01 March 2006      Published:  01 February 2007
PACS:  33.80.Rv (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))  
  31.15.E-  
  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)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10405025, 10575012 and 10435020).

Cite this article: 

Zhang Feng-Shou, Xiao Guo-Qing, Zhang Yan-Ping, Meng Ke-Lai High-order harmonic generation and multi-photon ionization of Na2 in laser fields 2007 Chin. Phys. 16 83

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