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)
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
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.
Received: 01 March 2006
Revised: 09 June 2006
Accepted manuscript online:
PACS:
33.80.Rv
(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
(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 Yan-Ping(张艳萍), Zhang Feng-Shou(张丰收), Meng Ke-Lai(蒙克来), and Xiao Guo-Qing(肖国青) High-order harmonic generation and multi-photon ionization of Na2 in laser fields 2007 Chinese Physics 16 83
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
