Darmstadt 2008 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 8: Laser - Systeme und Anwendungen II

K 8.3: Vortrag

Donnerstag, 13. März 2008, 17:00–17:15, 3E

Ultrafast Dynamical Processes in Laser Pulse-Heated Metals — •Banaz Omar and Baerbel Rethfeld — Technical University of Kaiserslautern, Department of Physics, Erwin Schroedinger Str. 46, D-67663 Kaiserslautern, Germany.

The microscopic dynamical processes in ultrashort laser pulse-heated metals have been theoretically investigated. The collision terms of Boltzmann equation have been solved numerically, considering the inverse bremsstrahlung absorption, electron-electron collision and electron-phonon interaction. The transient non-equilibrium evolution of electron distribution function due to excitation and the subsequent thermalization of the free electrons is studied. In contrast to aluminum, with a free-electron like conduction band considered in [1], the d-band in gold lies within the conduction band at about 2.5 eV below the Fermi surface of free electrons in s-band. Therefore, secondary electrons may be excited strongly from the d-band, even for laser pulses with energy lower than 2.5 eV. We apply our kinetic approach to the case of gold by taking the electron density of states into account, and compare with the case of excitation of aluminum.

[1] B. Rethfeld, A. Kaiser, M. Vicanek, and G. Simon, Phys. Rev. B 65, 214303 (2002)