Femtosecond time-resolved reflectivity of hydrodynamically expanding metal surfaces
- 15 October 1992
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 17 (20) , 1450-1452
- https://doi.org/10.1364/ol.17.001450
Abstract
We present femtosecond time-resolved p- and s-polarized reflectivity measurements of silver, aluminum, and tungsten surfaces that are hydrodynamically expanding in response to pulsed laser excitation. A numerical model of the experimental results shows that (1) electron heating and surface expansion influence the reflectivity on distinguishable time scales and (2) covalency, described by non-Drude dielectric constants, is necessary to explain the time-resolved reflectivity of the tungsten target.Keywords
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