High shock release in ultrafast laser irradiated metals: Scenario for material ejection

J. P. Colombier, P. Combis, R. Stoian, and E. Audouard
Phys. Rev. B 75, 104105 – Published 12 March 2007

Abstract

We present one-dimensional numerical simulations describing the behavior of solid matter exposed to subpicosecond near infrared pulsed laser radiation. We point out to the role of strong isochoric heating as a mechanism for producing highly nonequilibrium thermodynamic states. In the case of metals, the conditions of material ejection from the surface are discussed in a hydrodynamic context, allowing correlation of the thermodynamic features with ablation mechanisms. A convenient synthetic representation of the thermodynamic processes is presented, emphasizing different competitive pathways of material ejection. Based on the study of the relaxation and cooling processes which constrain the system to follow original thermodynamic paths, we establish that the metal surface can exhibit several kinds of phase evolution which can result in phase explosion or fragmentation. An estimation of the amount of material exceeding the specific energy required for melting is reported for copper and aluminum and a theoretical value of the limit size of the recast material after ultrashort laser irradiation is determined. Ablation by mechanical fragmentation is also analyzed and compared to experimental data for aluminum subjected to high tensile pressures and ultrafast loading rates. Spallation is expected to occur at the rear surface of the aluminum foils and a comparison with simulation results can determine a spall strength value related to high strain rates.

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  • Received 16 December 2005

DOI:https://doi.org/10.1103/PhysRevB.75.104105

©2007 American Physical Society

Authors & Affiliations

J. P. Colombier1,2, P. Combis1, R. Stoian2, and E. Audouard2

  • 1CEA/DAM Ile de France, Dept de Physique Théorique et Appliquée, BP 12, 91680 Bruyères-le-Châtel, France
  • 2Laboratoire Hubert Curien, Université Jean Monnet, UMR CNRS 5516, 18 rue Benoît Lauras, 42000 Saint-Etienne, France

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Issue

Vol. 75, Iss. 10 — 1 March 2007

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