THz generation by dual-color pulse in prealigned molecules
Abstract
We demonstrate that the THz generation in air from a dual-color pulse, composed of the fundamental and second-harmonic waves, can be coherently controlled by field-free molecular alignment. By tuning its time delay to properly match various molecular alignment revivals, the THz generation from the dual-color pulse can be promoted or decreased due to the spatial cross-(de)focusing effect and the alignment-dependent ionization probabilities of the prealigned diatomic molecules of air. For the dual-color pulse of orthogonally polarized fundamental and second-harmonic waves, the polarization of the generated THz radiation can be controlled by the field-free molecular alignment, which functions as a transient dynamic wave-plate for the dual-color pulse with different phase velocities for the orthogonally polarized field components. The plasma effect on the THz generation of the dual-color pulse is also observed, leading to additional intensity and polarization control of the THz radiation.
Keywords
Cite
@article{arxiv.1008.3673,
title = {THz generation by dual-color pulse in prealigned molecules},
author = {Jian Wu and Yuqi Tong and Min Li and Haifeng Pan and Heping Zeng},
journal= {arXiv preprint arXiv:1008.3673},
year = {2015}
}
Comments
This paper has been withdrawn by the authors. The paper has been accepted for publication by Physical Review A, where you can find more details