Classical effect for enhanced high harmonic yield in ultrashort laser pulses with a moderate laser intensity
Abstract
We study the influence of the pulse duration on high harmonic generation (HHG) with exploring a wide laser-parameter region theoretically. Previous studies have showed that for high laser intensities near to the saturation ionization intensity, the HHG inversion efficiency is higher for shorter pulses since the ground-state depletion is weaker in the latter. Surprisingly, our simulations show this high efficiency also appears even for a moderate laser intensity at which the ionization is not strong. A classical effect relating to shorter travel distances of the rescattering electron in shorter pulses, is found to contribute importantly to this high efficiency. The effect can be amplified significantly as a two-color laser field is used, suggesting an effective approach for increasing the HHG yield.
Keywords
Cite
@article{arxiv.1509.04457,
title = {Classical effect for enhanced high harmonic yield in ultrashort laser pulses with a moderate laser intensity},
author = {Y. Z. Shi and F. L. Dong and Y. P. Li and S. Wang and Y. J. Chen},
journal= {arXiv preprint arXiv:1509.04457},
year = {2015}
}
Comments
7 pages, 8 figures