Abstract
Electron-phonon relaxation in metals following ultrashort- pulse optical excitation has been studied both in thin films and bulk metals by a number of investigators. Here we report recent experiments on ion emission from several different metals using a free-electron laser which delivers a train of subpicosecond micropulses in the mid-IR. The threshold intensities for the damage threshold together with the ion emission are used as markers for the onset of energy transfer to the lattice for ablation. Numerical calculations based on the Anisimov two-temperature model are used to evaluate the electron temperature Te and the lattice temperature Ti from the incident fluence at the damage threshold and the ion-emission. The result will be discussed in terms of the Hertz-Knudsen equation for vaporization and of a model based on laser induced multiple electronic transitions.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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