High-order harmonic generation in laser-aligned molecules

N. Hay, R. Velotta, M. Lein, R. de Nalda, E. Heesel, M. Castillejo, J. P. Marangos
2002 Physical Review A. Atomic, Molecular, and Optical Physics  
We demonstrate high-order harmonic generation in high-density vapors of laser-aligned molecules. Ensembles of aligned CS 2 and N 2 are formed in the focus of a 300 ps duration laser pulse with sufficient density ͑ϳ10 17 molecules cm Ϫ3 ͒ to enable efficient high-order harmonic generation by a second, 70-fs, high-intensity laser pulse. We are able to modulate and significantly enhance the harmonic intensity in aligned molecules compared to the randomly oriented case. Our results are explained by
more » ... ts are explained by considering the influence of an anisotropic dipole phase. Strong support for this interpretation is provided by theoretical results for high-order harmonic generation in the aligned H 2 ϩ model system.
doi:10.1103/physreva.65.053805 fatcat:xodrg65tjreytkarmb4jahqu5m