Probing ultrashort-pulse laser excitation of sapphire: From the initial carrier creation to material ablation

Abstract : Ultrashort-pulse laser excitation of dielectrics has been investigated over a large span of intensities. Experimentally, single-shot studies on single-crystal sapphire samples combine time-resolved spectral interferometry with time-resolved reflectivity and ablation-rate measurements. The complete development of the excitation from the first creation of conduction-band electrons at low intensities to the formation of a highly excited plasma and associated material fragmentation is observed experimentally and explained by a single theoretical model, which combines material excitation in a multiple-rate equation description with light propagation. Copyright (C) EPLA, 2014
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Submitted on : Wednesday, June 25, 2014 - 9:06:29 AM
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Kristian J. Waedegaard, Ditte B. Sandkamm, Alexandros Mouskeftaras, Stéphane Guizard, Peter Balling. Probing ultrashort-pulse laser excitation of sapphire: From the initial carrier creation to material ablation. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2014, 105 (47001), pp.n/a. ⟨10.1209/0295-5075/105/47001⟩. ⟨hal-01011921⟩

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