Abstract
Spectral studies of optical emission from plumes produced via ablation of the surface of stainless steel in the phase explosion regime at different incident fluences by a pair of collinear degenerate femtosecond laser pulses, separated by variable delay time of 0.01–1.5 ns, demonstrate a drastic decrease in atomic emission intensities in a subnanosecond range. This effect was related to “bulk” absorption of the second pump pulse in ablative plumes with near-critical density, achieved during their hydrodynamic expansion on a subnanosecond timescale.
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Original Russian Text © E.I. Ageev, V.Yu. Bychenkov, V.P. Veiko, A.A. Ionin, S.I. Kudryashov, A.A. Petrov, A.A. Samokhvalov, 2016, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2016, Vol. 104, No. 6, pp. 435–439.
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Ageev, E.I., Bychenkov, V.Y., Veiko, V.P. et al. Double-pulse femtosecond laser ablation of the surface of stainless steel with variable interpulse delays. Jetp Lett. 104, 421–424 (2016). https://doi.org/10.1134/S0021364016180065
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DOI: https://doi.org/10.1134/S0021364016180065