J. Phys. IV France 01 (1991) C7-179-C7-182
GENERATION OF SHOCK WAVES BY LASER-MATTER INTERACTION IN CONFINED GEOMETRIESD. DEVAUX1, R. FABBRO1 and J. VIRMONT2
1 Laboratoire d'Applications des Lasers de Puissance (LALP), Unité Mixte ETCA-CNRS, 16 bis avenue Prieur de la Côte d'Or, F-94114 Arcueil cedex, France
2 Laboratoire de Physique des Milieux Ionisés (PMI), Ecole Polytechnique, F-91128 Palaiseau cedex, France
We study, in this paper, the mechanisms of generation of shock waves by a laser-induced plasma in confined geometry. Two models, analytical and numeric, have been developed to describe the laser-matter interaction. Experiments have been carried out with a neodymium glass laser at flux of 107 to 1011 GW/cm2, and pulse duration of 3 and 30 nanosecond. The plasma pressure in various configuration and its temperature have been determined. We have shown that the pressure of the shock wave applied to the target is 5 to 10 greater in confined geometry than in direct ablation. We have also studied the dielectric breakdown, which is the main limit to the confinement technique. This technique of generation of shock waves provides peak pressure up to 10 GPa and have various applications in metallurgic surface treatment and surgery.
© EDP Sciences 1991