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Optical properties under exposure to ultra short laser pulses

Hüttner, Bernd (2002) Optical properties under exposure to ultra short laser pulses. Journal of Physics - Condensed Matter, 14, Seiten 6689-6700. IOP Publishing Ltd.

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Kurzfassung

For the description of the interaction of a fs-laser pulse with a solid, the standard values of the properties of a solid are not suited because they have experimentally been determined or theoretically derived under the assumptions of a steady state and local thermal equilibrium. Depending on the property considered and the laser pulse duration either one or both of these conditions may be violated. This is caused by the appear-ance of a local thermal nonequilibrium, a nonsteady state, and the possibly large difference between the temperatures of the electron and phonon subsystem. For a deeper understanding and for the predictability of experimental results, it is essential to have knowl-edge of the optical properties and especially of the absorption and of the optical penetration depth on the fs time scale. In this paper, we derive equations for the optical properties of metals in the case of local thermal nonequilibrium between the electron and phonon system. For given laser intensities, we calculate, as an example, the optical properties for gold. For this purpose, we need the time dependent temperatures of the electrons and phonons. They are evaluated by means of our extended two temperature model. Finally, we compare the results with the standard equilibrium behavior as well as with the experimental findings and close with a short discussion.

Dokumentart:Zeitschriftenbeitrag
Titel:Optical properties under exposure to ultra short laser pulses
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Hüttner, BerndNICHT SPEZIFIZIERT
Datum:2002
Erschienen in:Journal of Physics - Condensed Matter
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:14
Seitenbereich:Seiten 6689-6700
Verlag:IOP Publishing Ltd
Status:veröffentlicht
Stichwörter:optical properties, short time physics, nonequilibrium, electrical conductivity, dielectric function, transient thermal reflectivity
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Laserforschung und -technologie
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Physik
Hinterlegt von: Dr.rer.nat. Bernd Hüttner
Hinterlegt am:09 Feb 2006
Letzte Änderung:14 Jan 2010 20:53

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