Journal
JETP LETTERS
Volume 94, Issue 10, Pages 753-758Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S002136401122005X
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- Russian Foundation for Basic Research [10-08-00941-a, 11-02-01202-a, 11-08-01165-a]
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The spallation of a nanometer-thick melt layer on a GaAs surface during its ablation by femtosecond laser pulses occurs with subnanosecond delays and lift-off velocities that depend on the laser fluence after its complete thermal (hydrodynamic) expansion/acoustic relaxation. The position of the spall interface in the melt is determined by the depth of the formation of a two-dimensional subsurface layer of nanobubbles (nanofoam), whereas the strongly heated surface layer of the melt above the nanofoam is partially removed in the form of a vapor-drop mixture. At the thermal expansion stage, acoustic reverberations are observed in the melt layer and characterize both the dynamics of an increase in its thickness and the shift of the cavitation region (nanofoam) inside the melt. Moreover, these reverberations can additionally stimulate spallation, promoting cavitation in the completely unloaded melt in the case of passage of a weak rarefaction wave. DOI: 10.1134/S002136401122005X
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