中国物理B ›› 2011, Vol. 20 ›› Issue (4): 44207-044207.doi: 10.1088/1674-1056/20/4/044207

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Supercontinuous high harmonic generation from asymmetric molecules in the presence of a terahertz field

王慧巧1, 杜洪川2, 胡碧涛2   

  1. (1)Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; (2)School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 收稿日期:2010-08-20 修回日期:2011-01-04 出版日期:2011-04-15 发布日期:2011-04-15
  • 基金资助:
    Project supported by the Program for New Century Excellent Talents in University and the National Natural Science Foundation of China (Grant Nos. 10775062 and 10875054) and the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2010-k08).

Supercontinuous high harmonic generation from asymmetric molecules in the presence of a terahertz field

Du Hong-Chuan(杜洪川)a), Wang Hui-Qiao(王慧巧)b), and Hu Bi-Tao(胡碧涛) a)†   

  1. a School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; b Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2010-08-20 Revised:2011-01-04 Online:2011-04-15 Published:2011-04-15
  • Supported by:
    Project supported by the Program for New Century Excellent Talents in University and the National Natural Science Foundation of China (Grant Nos. 10775062 and 10875054) and the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2010-k08).

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摘要： We have investigated high-order harmonic generation from asymmetric molecules. It is found that supercontinuous high harmonics, which are produced from asymmetric molecules by significantly steering the ionization, are broken down when the electric field of the 5-fs driving laser pulse is increased to 0.16 a.u. The high harmonic generation from asymmetric molecules with the presence of a terahertz field is also investigated. This reveals that the terahertz controlled laser pulse significantly increases the energy difference between photons, emitted from the ejected electrons, in the first and second halves of the optical cycle at the centre of the driving laser pulse. In this way, a 200-eV broadband supercontinuum can be produced in the plateau, from which a 60-as pulse with a bandwidth of 60 eV can be directly obtained with a minor post-pulse.

关键词: high-order harmonic, attosecond pulse, supercontinuum

Abstract: We have investigated high-order harmonic generation from asymmetric molecules. It is found that supercontinuous high harmonics, which are produced from asymmetric molecules by significantly steering the ionization, are broken down when the electric field of the 5-fs driving laser pulse is increased to 0.16 a.u. The high harmonic generation from asymmetric molecules with the presence of a terahertz field is also investigated. This reveals that the terahertz controlled laser pulse significantly increases the energy difference between photons, emitted from the ejected electrons, in the first and second halves of the optical cycle at the centre of the driving laser pulse. In this way, a 200-eV broadband supercontinuum can be produced in the plateau, from which a 60-as pulse with a bandwidth of 60 eV can be directly obtained with a minor post-pulse.

Key words: high-order harmonic, attosecond pulse, supercontinuum

中图分类号:  (Frequency conversion; harmonic generation, including higher-order harmonic generation)

  • 42.65.Ky
32.80.Rm (Multiphoton ionization and excitation to highly excited states) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)