High-Order Harmonics and Isolated-Attosecond Pulse Generation of Three-Dimensional H Atom by UV-Assisted Chirped Fields
Year: 2016
Author: Hong-Dan Zhang, Jing Guo, Hui-Ying Zhong, Xiang-Yi Luo, Hui Du, Yan Shi, Xuri Huang, Xue-Shen Liu
Journal of Atomic and Molecular Sciences, Vol. 7 (2016), Iss. 3 : pp. 135–145
Abstract
By solving the time-dependent Schrödinger equation (TDSE) accurately with time-dependent generalized pseudospectral (TDGPS) method, we theoretically investigated the high-order-harmonic generation (HHG) from three dimensional (3D) Hydrogen atom in ultraviolet (UV)-assisted chirped fields. When a 128 nm UV pulse is added on a chirped fundamental field, the HHG spectra is greatly broadened and enhanced, which is quite similar as the HHG from H atom initially prepared in the first excited state in the chirped field only. Besides, the HHG of H atom in the combination of a chirped fundamental field and a 256 nm UV pulse case is also investigated. The HHG process is illustrated by the semi-classical three-step model and the time-frequency analysis. The ionization probability and electron wavepacket as functions of time are also calculated to further illustrate this phenomenon. Furthermore, we also discuss the influence of time delay between the chirped fundamental field and the 128 nm UV pulse on HHG process. Finally, by superposing the harmonics in the range of 200th-260th order, an isolated attosecond pulse with a duration of about 64 as can be generated.
You do not have full access to this article.
Already a Subscriber? Sign in as an individual or via your institution
Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/jams.022016.041316a
Journal of Atomic and Molecular Sciences, Vol. 7 (2016), Iss. 3 : pp. 135–145
Published online: 2016-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 11
Keywords: High-order harmonic generation generalized pseudospectral method UV-assisted chirped fields attosecond pulse.
Author Details
-
Harmonic emission spectra and attosecond pulse generation from helium atom driven by the mid-infrared nonhomogeneous field
Liu, Hang
Feng, R. Liqiang
Spectroscopy Letters, Vol. 50 (2017), Iss. 5 P.289
https://doi.org/10.1080/00387010.2017.1322987 [Citations: 2]