Coherent Wake Emission of High-Order Harmonics from Overdense Plasmas

We present a new mechanism for high-order harmonic generation by reflection of a laser beam from an overdense plasma, efficient even at moderate laser intensities (down to $I{\ensuremath{\lambda}}^{2}\ensuremath{\approx}4\ifmmode\times\else\texttimes\fi{}{10}^{15}\text{ }\text{ }\mathrm{W}\text{ }{\... View More