Spectral Evidence for Collisionless Absorption in Subpicosecond Laser-Solid Interactions
Charles T. HansenUniversity of California, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550S. C. WilksUniversity of California, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550P. E. YoungUniversity of California, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550
1999en
ABI
Abstract
Second-harmonic emission produced by the interaction of a 130-fs laser pulse with solid aluminum has been spectrally analyzed. For an angle of incidence near 20\ifmmode^\circ\else\textdegree\fi{}, the specular second harmonic is blueshifted when the laser intensity exceeds $5\ifmmode\times\else\texttimes\fi{}{10}^{16}\phantom{\rule{0ex}{0ex}}\mathrm{W}/{\mathrm{cm}}^{2}$. This effect is also observed in particle-in-cell simulations of the experiment. The blueshift is interpreted as a signature of the onset of absorption due to the anomalous skin effect.
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