Abstract
The dynamical properties of copper metal are obtained on a picosecond time scale using 100fs laser pulse at 1015Wcm−2—an intensity regime relevant to femtosecond micromachining. The dissipation mechanisms and scaling laws spanning a wide temperature range are obtained from femtosecond pump–probe reflectivity. We observe obliteration of the crystalline structure in copper within 400fs due to lattice disorder caused by the intense laser pulse. The electrical resistivity is obtained by studying the probe reflectivity evolution from 0to30ps. The “resistivity saturation” effect in an unexplored regime intermediate to hot plasma and cold solid is studied in detail. The temperature evolution and thermal conductivity values are also obtained.
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