The European Physical Journal Applied Physics (EPJ AP)

Issue		Eur. Phys. J. AP Volume 3, Number 2, August 1998
Page(s)		215 - 218
DOI		10.1051/epjap:1998222

DOI: 10.1051/epjap:1998222

Eur. Phys. J. AP 3, 215-218

Experimental study of the transmission of breakdown plasma generated during laser shock processing

L. Berthe - R. Fabbro - P. Peyre - E. Bartnicki

Centre Laser Franco-Allemand (CLFA), Laboratoire pour l'Application des Lasers de Puissance (LALP), 16 bis, avenue Prieur de la Côte d'Or, 94114 Arcueil Cedex, France

Received: 6 January 1998 / Revised: 16 April 1998 / Accepted: 30 April 1998

Abstract
Shock wave generation from laser-produced plasma in water confinement regime for an incident 25-30 ns / 40 J / $\lambda = 1.064~\mathrm{\mu m}$ laser beam has been studied. Transmitivity measurement of the parasitic plasma breakdown at the surface of water confinement has been performed with a continuous laser probe. Above $\mathrm{6~GW/cm^2}$ incident laser intensity, the critical electronic density for the laser wavelength is achieved inside the plasma by cascade ionization during the pulse duration. Above $\mathrm{10~GW/cm^2}$ , peak power density transmitted through the plasma saturates. The laser pulse transmitted through the breakdown plasma corresponds to the part of incident laser pulse preceding the transmission cut-off.

PACS
52.50.Jm Plasma production and heating by laser beams - 62.50.+p High-pressure and shock-wave effects in solids and liquids

Author for correspondance: berthe@etca.fr, fabbro@etca.fr

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