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Proceedings Paper

Physics of transport at short laser pulses
Author(s): Bernd Huettner
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Paper Abstract

The nonequilibrium properties of the electrical and thermal currents in metals in the transient regime are investigated. The transition range, by definition, lies between the time necessary for establishing the electron temperature and the time that justifies a description by the standard steady state equations. Using a second order expansion of the Boltzmann equation, we derive the relaxation functions for the electrical and thermal cases and determine the relaxation times related to them. It is shown that the relaxation time for the electrical transport corresponds to Drude's momentum scattering time whereas the corresponding time for the heat flow is identified as the electron temperature relaxation time. Consequently, Ohm's law should remain a good approximation in most cases whereas the Fourier equation must be supplemented by a relaxation term leading to the hyperbolic heat conduction equation. In addition, we discuss the changed properties of the electrical and thermal conductivity on short time scales and show that both quantities becomes explicit functions of time. Moreover, the thermal conductivity shows a dependence on the laser frequency.

Paper Details

Date Published: 16 August 2000
PDF: 23 pages
Proc. SPIE 4065, High-Power Laser Ablation III, (16 August 2000); doi: 10.1117/12.407363
Show Author Affiliations
Bernd Huettner, DLR (Germany)

Published in SPIE Proceedings Vol. 4065:
High-Power Laser Ablation III
Claude R. Phipps, Editor(s)

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