, Volume 83, Issue 2, pp 333-336
Date: 08 Feb 2006

Ultra-short laser ablation of metals and semiconductors: evidence of ultra-fast Coulomb explosion

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Abstract

We have studied ultra-fast laser ablation of Si and a metal via the neutral and ion yield, the energy distribution of emitted neutrals and the charge distribution as a function of the laser pulse width. Two processes, one leading to the ejection of fast (3–7 eV), the other to slow thermal particles, can be identified. The origin of the first process can be correlated with laser pulse widths (or pump–probe delays) and processes on a time scale below 100 fs. Results for Si confirm recent findings for Coulomb explosion (CE) and we show for the first time that CE exists as a mechanism of material removal from metals for ultra-short laser pulses.

PACS

06.60.Jn; 79.20.Ds; 79.60.Bm; 42.62.Fi; 71.20.-b