Isolated Attosecond Pulse Generation in a 800 nm Laser Field by Adding a Terahertz (THz) Pulse

Authors

  • Hui Du Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
  • Xin-Lei Ge Department of College Foundation Education, Bohai University, Jinzhou 121013, People’s Republic of China
  • Yun-Tao Lin Jiangxi Nankang Middle School, Ganzhou 341400, People’s Republic of China
  • Hui-Ying Zhong Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
  • Jing Guo Aimer Human Engineering Research Centre, Beijing Institute of Fashion Technology, Beijing 100029, China
  • Xue-Shen Liu Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China

DOI:

https://doi.org/10.4208/jams.022516.041916a

Keywords:

High-order harmonic generation, isolated attosecond pulse, terahertz pulse.

Abstract

We theoretically study the high-order harmonic and the isolated attosecond pulse generation in the near-infrared (IR) (3-fs, 800 nm) laser pulse by adding a terahertz (THz) controlling field with proper phases. It is found that the high-order harmonic spectrum in the IR pulse by adding a terahertz field is broader and smoother than that in the single IR pulse. The underlying physical mechanism is illustrated by means of the time-frequency analysis and the three-step model. We calculate the ionization rate by ADK model to further demonstrate the process of high-order harmonic generation. By superposing a proper range of harmonic spectrum, an isolated attosecond pulse with the duration of 71 as is obtained.

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Published

2016-07-01

Issue

Vol. 7 No. 3 (2016)

Section

Articles