Abstract
A femtosecond laser pulse with power density of 1013 to 1014 W/cm2 incident on a metal target causes ablation and ejection of the surface layer. The ejected laser plume has a complicated structure. At the leading front of the plume, there is a spall layer where the material is in a molten state. The spall layer is a remarkable part of the plume in that the liquid-phase density does not decrease with time elapsed. This paper reports theoretical and experimental studies of the formation, structure, and ejection of the laser plume. The results of molecular dynamics simulations and a theoretical survey of plume structure based on these results are presented. It is shown that the plume has no spall layer when the pulse fluence exceeds an evaporation threshold F ev. As the fluence increases from the ablation threshold F a to F ev, the spall-layer thickness for gold decreases from 100 nm to a few lattice constants. Experimental results support theoretical calculations. Microinterferometry combined with a pump-probe technique is used to obtain new quantitative data on spallation dynamics for gold. The ablation threshold is evaluated, the characteristic crater shape and depth are determined, and the evaporation threshold is estimated.
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Original Russian Text © N.A. Inogamov, V.V. Zhakhovskii, S.I. Ashitkov, Yu.V. Petrov, M.B. Agranat, S.I. Anisimov, K. Nishihara, V.E. Fortov, 2008, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2008, Vol. 134, No. 1, pp. 5–28.
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Inogamov, N.A., Zhakhovskii, V.V., Ashitkov, S.I. et al. Nanospallation induced by an ultrashort laser pulse. J. Exp. Theor. Phys. 107, 1–19 (2008). https://doi.org/10.1134/S1063776108070017
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DOI: https://doi.org/10.1134/S1063776108070017