Current state-of-the art radiation-hydrodynamic codes do not include the physics involved in the laser-induced solid-to-plasma transition. However, this transition process is understood to significantly impact the resulting ablation and shock front geometry, due to “laser imprint” and “shinethrough.” An experimental system involving synchronized femtosecond and picosecond lasers is developed to initiate and characterize dynamics of planar target materials irradiated by conditions similar to a “picket” prepulse from a direct-drive pulse shape. Ultrafast imaging of the resulting plasma formation, plume expansion, and shock-wave propagation is performed with femtosecond-scale resolution for a polystyrene target. These results may be used to improve future direct-drive experimental and modeling efforts.
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