Abstract
The interaction of a 1 ps laser pulse of moderate contrast ratio(~104) with a Cu target is investigated at laser intensities I of upto 3×1016 W cm-2 with the use of corpuscular, x-ray and opticaldiagnostics. Intensity-dependent characteristics of ion and x-ray emission aswell as reflectivity, electron temperature and average charge state of plasmaproduced by the laser pulse are presented and discussed. It is found that(a) the specular reflectivity dependence on intensity for a moderate-contrastultrashort (⩽1 ps) pulse is qualitatively and quantitatively differentfrom that for a high-contrast ultrashort pulse; (b) the scaling laws forparameters of thermal ions are essentially different from those for fast ions;(c) the soft x-ray yield scales as Iα with α≈2-2.5 inthe intensity range 1014-3×1016 W cm-2; and (d) electrontemperature scales as I0.44 at 1015<I<3×1016 W cm-2.
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