Use of multilayer targets for achieving off-Hugoniot states.

We present an approach for the realization of extreme off-Hugoniot states of matter in laser-driven shock experiments. The method is based on the application of impedance-mismatch effect in sandwich targets. In order to verify this model we have realized numerical simulations using the two-dimensional hydrocode MULTI in three-layer targets (gold-aluminum-gold) with laser intensities 10 14 W/cm 2 and obtained pressures 10 Mbar. Results show the possibility of obtaining high pressures with relatively small temperatures for a low-impedance material sandwiched between layers with high density material.