Time reversal in solids: theory and experiment

We present the first theoretical approach to determine the ability of an acoustic time reversal mirror (TRM) to focus through a liquid fluid-solid interface on a point located in a homogeneous isotropic solid. We consider both P- and S-waves and their transmission into a fluid where TRMs work. A general way to obtain refocusing quality is shown and illustrated by the example of the reversal of a laser source working in the ablation regime. The theoretical results are compared with experiments carried out in our laboratory