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

Ablation of metals by ultrashort laser pulses

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