Experimental study of hydrodynamic perturbation evolution triggered by a
laser-driven shock wave breakout at the free rippled rear surface of a plastic
target is reported. At sub-megabar shock pressure, planar jets manifesting the
development of the Richtmyer-Meshkov-type instability in a non-accelerated
target are observed. As the shock pressure exceeds 1 Mbar, an oscillatory
rippled expansion wave is observed, followed by the "feedout" of the
rear-surface perturbations to the ablation front and the development of the
Rayleigh-Taylor instability, which breaks up the accelerated target.Comment: 12 pages, 4 figure