Dynamics of Crater Evolution During Laser Treatment of Materials

Acoustic emission of the destruction zone formed upon exposure of the metal surface to pulsed laser radiation is considered. A dependence of the waveform and spectrum of acoustic vibrations on the parameters of the irradiated material and a law of increase in the crater depth are determined. It is revealed that for the copper sample surface irradiated by the laser pulse with duration of ~20 μs, the time of growth of the destruction zone is approximately 40 μs, which is in good agreement with the time of existence of plasma formation at the surface of the target treated by laser plasma (~50 μs).