Numéro
J. Phys. IV France
Volume 01, Numéro C7, Décembre 1991
2nd International Conference
Laser M2P
Page(s) C7-193 - C7-197
DOI http://dx.doi.org/10.1051/jp4:1991752
2nd International Conference
Laser M2P

J. Phys. IV France 01 (1991) C7-193-C7-197

DOI: 10.1051/jp4:1991752

ELECTROMECHANICAL EFFECTS OF PULSED LASERS

J.Ph. LAURENT, J. ENGLENDER, A. ANTONETTI and Y. LECARPENTIER

Institut National pour la Santé et la Recherche Médicale, Unité 275, LOA-ENSTA, Ecole Polytechnique, F-91128 Palaiseau, France


Abstract
A theoritical study of the electromechanical effects of pulsed lasers on biological tissues is presented. The initiation of the plasma is more likely due to a thermal effect (heating and ionization of the gas) than to a multiphotonic process (simultaneous action of several light quanta). The mechanism of expansion of the plasma by inverse bremsstrahlung is described. The shock waves and the gas bubble generated by the-ultra fast expansion of the plasma are studied. Theoritical results fit the experimental observations and permit to conclude that electromechanical effects are the main process during the fragmentation of the calculi and are quite useful during the ablation of atheroma



© EDP Sciences 1991