Influence of metastable states on process of pulse laser treatment of superconducting ceramics

V. I. Mazhukin ; I. V. Gusev ; A. V. Shapranov

Matematičeskoe modelirovanie, Tome 5 (1993) no. 5, pp. 30-60.

Résumé

The mechanisms of the laser-induced melting and evaporation of superconducting ceramics is investigated on the basis of the combined version of Stephan problem. Numerical integration are carried out by means of the dynamical adaptation method. The investigations are performed for the wide range of wavelengths $\lambda\simeq0.3\div1.06$ $\mu m$. It is shown, that the overheated metastable states in solid and liquid phases are appeared during melting and evaporation if the radiation energy release is of volumetric type. The presence of the metastable states lead to the increasing of the melting velocity and to the decreasing of the velocity of evaporation. The influence of metastable states increase while the radiation wavelength is increased up to $\lambda\simeq1.06$ $\mu m$, and can lead to the instability of some processes, e.g. of the evaporation process.