Optical properties under exposure to ultrashort laser pulses
Hüttner, B, (2002) Optical properties under exposure to ultrashort laser pulses. Journal of Physics - Condensed Matter, 14 (26), pp. 6689-6700.
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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 appearance 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 knowledge 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.
|Title:||Optical properties under exposure to ultrashort laser pulses|
|Journal or Publication Title:||Journal of Physics - Condensed Matter|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 6689-6700|
|Keywords:||ultrashort laser pulses, nonequilibrium, nonsteady state, optical properties, metals|
|HGF - Research field:||Energy|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|DLR - Research area:||Energy|
|DLR - Program:||L - no assignement|
|DLR - Research theme (Project):||L - Laser Research and Technology|
|Institutes and Institutions:||Institute of Technical Physics|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||16 Sep 2005|
|Last Modified:||06 Jan 2010 14:47|
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