S. I. Ashitkov, N. A. Inogamov, V. V. Zhakhovskii, Yu. N. Emirov, M. B. Agranat, I. I. Oleinik, S. I. Anisimov, V. E. Fortov, “Formation of nanocavities in the surface layer of an aluminum target irradiated by a femtosecond laser pulse”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2012, Volume 95, Issue 4,Pages <nobr>192

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PLASMA, HYDRO- AND GAS DYNAMICS

Formation of nanocavities in the surface layer of an aluminum target irradiated by a femtosecond laser pulse

S. I. Ashitkov^a, N. A. Inogamov^b, V. V. Zhakhovskii^c, Yu. N. Emirov^d, M. B. Agranat^b, I. I. Oleinik^c, S. I. Anisimov^b, V. E. Fortov^a

^a Scientific Association for High Temperatures, Russian Academy of Sciences
^b L. D. Landau Institute for Theoretical Physics, Russian Academy of Sciences
^c University of South Florida, Department of Physics
^d Nanomaterials and Nanomanufacturing Research Center, University of South Florida

Abstract: It has been revealed experimentally that nanocavities remain inside a surface layer of aluminum after action of a femtosecond laser pulse. This result is in agreement with numerical simulation. A detailed picture of melting, formation of expansion and compression waves, and bubble nucleation in the stretched melt has been reconstructed through atomistic simulation. It has been shown that the bubbles do not fully collapse but remain as frozen disk-shaped nanocavities upon recrystallization of the melt. The formation of a porous metal with small voids is very important for understanding the physics of laser exposure and may have significant applications.

Received: 18.01.2012