https://doi.org/10.1051/epjap:1998222
Experimental study of the transmission of breakdown plasma generated during laser shock processing
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
Corresponding authors: berthe@etca.fr fabbro@etca.fr
Received:
6
January
1998
Revised:
16
April
1998
Accepted:
30
April
1998
Published online: 15 August 1998
Shock wave generation from laser-produced plasma in water confinement regime for an incident 25–30 ns / 40 J / λ = 1.064 µm 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 6 GW/cm2 incident laser intensity, the critical electronic density for the laser wavelength is achieved inside the plasma by cascade ionization during the pulse duration. Above 10 GW/cm2, 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
© EDP Sciences, 1998
