Collective Absorption Dynamics and Enhancement in Deformed Targets
Hartmut Ruhl, Peter Mulser, Steffen Hain, Fulvio Cornolti, Andrea Macchi
Abstract
The interaction of intense fs laser pulses with thin foils that have an imposed deformation is compared with thick targets that develop bow shocks. Both target types yield good absorption. Up to 80% absorption is obtained for a 0.2μm thick, 15 times over-dense foil at 4 · 1018 W/cm2. A value of 50% is obtained for a 4 μm thick, 2 times over-dense thick target at 1018 W/cm2. For comparable extension and curvature of the laser-plasma interfaces absorption levels in both targets become similar. In both absorption scales weakly with intensity and density. Energy transport in thin foils and thick targets, however, is different.
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