TY - JOUR
T1 - Isolated Attosecond Pulse Generation in a 800 nm Laser Field by Adding a Terahertz (THz) Pulse
AU - Du , Hui
AU - Ge , Xin-Lei
AU - Lin , Yun-Tao
AU - Zhong , Hui-Ying
AU - Guo , Jing
AU - Liu , Xue-Shen
JO - Journal of Atomic and Molecular Sciences
VL - 3
SP - 146
EP - 154
PY - 2016
DA - 2016/07
SN - 7
DO - http://doi.org/10.4208/jams.022516.041916a
UR - https://global-sci.org/intro/article_detail/jams/8143.html
KW - High-order harmonic generation, isolated attosecond pulse, terahertz pulse.
AB - <p style="text-align: justify;">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.</p>