Nonequilibrium effects accompanying the action of pulsed laser radiation on metals

Мажукин В.И., Мажукин А.В., Демин М.М., Шапранов А.В. Эффекты неравновесности при воздействии импульсного лазерного излучения на металлы // Оптический журнал. 2011. Т. 78. № 8. С. 29–37.

Mazhukin V.I., Mazhukin A.V., Demin M.M., Shapranov A.V. Nonequilibrium effects accompanying the action of pulsed laser radiation on metals [in Russian] // Opticheskii Zhurnal. 2011. V. 78. № 8. P. 29–37.

V. I. Mazhukin, A. V. Mazhukin, M. M. Demin, and A. V. Shapranov, "Nonequilibrium effects accompanying the action of pulsed laser radiation on metals," Journal of Optical Technology. 78(8), 491-497 (2011). https://doi.org/10.1364/JOT.78.000491

This paper discusses two regimes of the laser ablation of metals (Al, Cu)—the nanosecond regime and the femtosecond regime. Mathematical modelling of nanosecond exposure has made it possible to determine the region where the single-temperature approximation can be applied. The laser pulse width must be at least 10 ns in this case. The modelling results showed that the nonequilibrium state has a qualitative effect on the main processes. They show up most clearly in femtosecond-exposure regimes, for which rapid phase transformations are accompanied by the appearance of strongly superheated (5000–15 000 K) metastable states and shock waves in the solid state, as well as by increased energy loss from the irradiation zone by electron thermal conductivity.

The research was supported by RFBR, projects Nos. 10-07-00246-а and № 09-07-00225-а.