We describe here a time resolved pump-probe laser techniqueâ??picosecond\ninterferometryâ??which has been combined with diamond anvil cells (DAC). This method enables the\nmeasurement of the longitudinal sound velocity up to Mbar pressure for any kind of material (solids,\nliquids, metals, insulators). We also provide a description of picosecond acoustics data analysis\nin order to determine the complete set of elastic constants for single crystals. To illustrate such\ncapabilities, results are given on the pressure dependence of the acoustic properties for prototypical\ncases: polycrystal (hcp-Fe-5 wt% Si up to 115 GPa) and single-crystal (Si up to 10 GPa).
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