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We present ultrafast pump-probe reflectivity and Doppler spectrometry of asilicon target at relativistic laser intensity. We observe an unexpected risein reflectivity to a peak approximately $\sim$9 ps after the main pulseinteraction with the target. This occurs after the reflectivity has fallen offfrom the initially high "plasma-mirror" phase. Simultaneously measuredtime-dependent Doppler shift data show an increase in blue shift at the sametime. Numerical simulations show that the aforementioned trends in theexperimental measurements correspond to a strong shock wave propagating backtowards the laser. The relativistic laser-plasma interaction indirectly heatsthe cool-dense ($n_{e}\geq10^{23} cm^{-3}$ and $T_{e} \sim 10 eV$) targetmaterial adjacent to the corona, by hot electron induced return currentheating, raising its temperature to around 150eV and causing it to explodeviolently. The increase in reflectivity is caused by the transient steepeningof the plasma density gradient at the probe critical surface due to thisexplosive behaviour.

Generation of a strong reverse shock wave in the interaction of a high-contrast high-intensity femtosecond laser pulse with a silicon target