@Article{JAMS-7-146, author = {Du , HuiGe , Xin-LeiLin , Yun-TaoZhong , Hui-YingGuo , Jing and Liu , Xue-Shen}, title = {Isolated Attosecond Pulse Generation in a 800 nm Laser Field by Adding a Terahertz (THz) Pulse}, journal = {Journal of Atomic and Molecular Sciences}, year = {2016}, volume = {7}, number = {3}, pages = {146--154}, 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.

}, issn = {2079-7346}, doi = {https://doi.org/10.4208/jams.022516.041916a}, url = {http://global-sci.org/intro/article_detail/jams/8143.html} }