Modeling of short-pulse laser-metal interactions in the warm dense matter regime using the two-temperature model

G. M. Petrov, A. Davidson, D. Gordon, and J. Peñano
Phys. Rev. E 103, 033204 – Published 23 March 2021

Abstract

A numerical model for laser-matter interactions in the warm dense matter regime is presented with broad applications, e.g., ablation, thermionic emission, and radiation. A unique approach is adopted, in which a complete set of collisional and transport data is calculated using a quantum model and incorporated into the classical two-temperature model for the electron and lattice-ion temperatures. The data set was produced by the average atom model that combines speed, conceptual simplicity, and straightforward numerical development. Such data are suitable for use in the warm dense matter regime, where most of the laser-matter interactions at moderate intensities occur, thus eliminating deficiencies of previous models, e.g., interpolation between solid and ideal plasma regimes. In contrast to other works, we use a more rigorous definition of solid and plasma states of the metal, based on the physical condition of the lattice, crystalline (ordered) versus melted (disordered), rather than a definition based on electron temperature. The synergy between the two-temperature and average atom models has been demonstrated on a problem involving heating and melting of the interior of Al by a short-pulse laser with duration 0.1–1 ps and laser fluences 1×1033×104J/m2(0.13J/cm2). The melting line, which separates the solid and plasma regimes, has been tracked in time and space. The maximum melting depth has been determined as a function of laser fluence: lmelt(μm)4×103F(Jm2).

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  • Received 5 October 2020
  • Accepted 10 February 2021

DOI:https://doi.org/10.1103/PhysRevE.103.033204

Published by the American Physical Society

Physics Subject Headings (PhySH)

Plasma Physics

Authors & Affiliations

G. M. Petrov, A. Davidson, D. Gordon, and J. Peñano

  • Naval Research Laboratory, Plasma Physics Division, 4555 Overlook Avenue SW, Washington, DC 20375, USA

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Issue

Vol. 103, Iss. 3 — March 2021

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