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Isolated attosecond pulse generated by a model helium atom exposed to the combined field

Huang Feng Li Peng-Cheng Zhou Xiao-Xin

Isolated attosecond pulse generated by a model helium atom exposed to the combined field

Huang Feng, Li Peng-Cheng, Zhou Xiao-Xin
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  • PDF Downloads:  559
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Publishing process
  • Received Date:  10 April 2012
  • Accepted Date:  24 May 2012
  • Published Online:  05 December 2012

Isolated attosecond pulse generated by a model helium atom exposed to the combined field

  • 1. Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 11044007, 11047016, 11264036), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20096203110001), and the Innovative Foundation of Northwest Normal University (Grant No. NWNU-KJCXGC-03-62).

Abstract: We theoretically study the high-order harmonic generation (HHG) of a model He atom exposed to a combined field of 1600 nm and 800 nm laser pulses. The changing of rising rate and falling rate with time for the combined filed during main HHG, can present the different characteristics of high-order harmonic generation from the short electron trajectories and the long electron trajectories. By superimposing several harmonics generated from He atom driven by the combined field, we could obtain shorter attosecond pulses. Finally, by adjusting the time delay between two laser pulses, we can effectively suppress the contribution of the short electron trajectories to HHG, and obtain an isolated attosecond pulse with duration 33.7 as.

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