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Ultrafast phase transitions after femtosecond laser irradiation of indium phosphide

AutorBonse, J. ; Wiggins, S. M.; Solís Céspedes, Javier
Fecha de publicación1-sep-2004
EditorAmerican Institute of Physics
CitaciónJournal of Applied Physics 96(5): 2628 (2004)
ResumenThe structural transformation dynamics of single-crystalline indium phosphide irradiated with 150 fs laser pulses at 800 nm has been investigated by means of time-resolved reflectivity measurements covering a time window from 150 fs up to 500 ns. The results obtained show that for fluences above the threshold of 0.16 J/cm2 thermal melting of the material occurs on the time scale of 1–2 ps, while ablation at higher fluences (> 0.23 J/cm2) is preceeded by an ultrafast phase transition ("nonthermal melting") occurring within 400 fs after the arrival of the pulse to the surface. The evolution of the reflectivity on a longer time scale shows a resolidification time typically around 25 ns after which an amorphous layer several tens of nanometer thick is formed on the surface.
Descripción4 pages, 2 figures.
Versión del editorhttp://dx.doi.org/10.1063/1.1776311
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