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Proceedings Paper

A general continuum approach to describe fast electronic transport in pulsed laser irradiated materials: the problem of Coulomb explosion
Author(s): Nadezhda M. Bulgakova; Razvan Stoian; Arkadi Rosenfeld; Wladimir Marine; Eleanor E.B. Campbell
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Paper Abstract

We present a continuum model, based on a drift-diffusion approach, aimed to describe the dynamics of electronic excitation, heating and charge-carrier transport in different materials (metals, semiconductors, and dielectrics) under femtosecond and nanosecond pulsed laser irradiation. The laser-induced charging of the targets is investigated at laser intensities above the material removal threshold. It is demonstrated that, under near-infrared femtosecond irradiation regimes, charging of dielectric surfaces causes a sub-picosecond electrostatic rupture of the superficial layers, alternatively called Coulomb explosion (CE), while this effect is strongly inhibited for metals and semiconductors as a consequence of superior carrier transport properties. On the other hand, simulations of UV nanosecond pulsed laser interaction with bulk silicon have pointed out the possibility of Coulomb explosion in semiconductors. For such regimes a simple analytical theory for the threshold laser fluence of CE has been developed, showing results in agreement with the experimental observations. Various related aspects concerning the possibility of CE depending on different irradiation parameters (fluence, wavelength and pulse duration) are discussed. This includes the temporal and spatial dynamics of charge-carrier generation in non-metallic targets and evolution of the reflection and absorption characteristics.

Paper Details

Date Published: 20 September 2004
PDF: 15 pages
Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.548823
Show Author Affiliations
Nadezhda M. Bulgakova, Institute of Thermophysics (Russia)
Razvan Stoian, Max-Born-Institut fur Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Arkadi Rosenfeld, Max-Born-Institut fur Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Wladimir Marine, CRMCN, CNRS and Univ. de la Mediterranee-Aix Marseille II (France)
Eleanor E.B. Campbell, Goteborg Univ. and Chalmers Univ. of Techology (Sweden)

Published in SPIE Proceedings Vol. 5448:
High-Power Laser Ablation V
Claude R. Phipps, Editor(s)

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