Abstract
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.
© 2011 OSA
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