Numéro
J. Phys. IV France
Volume 04, Numéro C4, Avril 1994
3rd International Conference Laser M2P
Page(s) C4-101 - C4-105
DOI http://dx.doi.org/10.1051/jp4:1994421
3rd International Conference Laser M2P

J. Phys. IV France 04 (1994) C4-101-C4-105

DOI: 10.1051/jp4:1994421

Laser plasma formation in metals vapour : kinetic approach

V. MAZHUKIN1, I. GUSEV1, I. SMUROV2 and G. FLAMANT3

1  Institute of Mathematical Modeling, Russian Academy of Sciences, Miusskaya Square 4, 125047 Moscow, Russia
2  Ecole Nationale d'Ingénieurs de Saint-Etienne, 58 rue Jean Parot, 42023 Saint-Etienne cedex 2, France
3  Institut de Science et de Génie des Matériaux et Procédés, CNRS, BP. 5, Odeillo, 66125 Font-Romeu cedex, France


Abstract
The break-down of metals vapour (Al, Cu) are simulated near the break-down threshold values of laser radiation. The approximations of collision-radiation model are used, including the detail kinetics of exited states with radiation and collision transitions, step-by-step ionisation process, unexitation and recombination. Energy balance is based on two-temperature approximation : for electrons and for heavy particles. It is shown that the particles concentration in exited states and plasma species composition differ rather from Saha-Boltzmann's distribution. Strong dependence of the break-down threshold intensity on initial temperature of neutral and charged particles is shown.



© EDP Sciences 1994