Crater drilling enhancement obtained in parallel non-collinear double-pulse laser ablation

Year: 2010

Authors: Cristoforetti G., Legnaioli S., Palleschi V., Tognoni E., Benedetti P.A.

Autors Affiliation: Applied Laser Spectroscopy Laboratory, Institute for Chemical-Physical Processes, Research Area of National Research Council, Via G. Moruzzi, 1, 56124 Pisa, Italy

Abstract: In order to investigate the double-pulse ablation mechanism, two parallel but non-collinear laser beams, delayed with respect to each other by 1 mu s, were focussed on an aluminium sample, so that a lateral distance of 600 microns exists between the centres of the two craters and no superposition of the laser-ablation zones is present. The use of such configuration results in a signal and in a plasma mass enhancement with respect to the single-pulse case almost equal to that obtained in the double-pulse collinear case. However, such a non-collinear geometry evidences a much more effective drilling of the surface. Such unexpected drilling seems to be related to a hydrodynamic drainage out of aerosol and molten material, hindering its re-deposition in and around the crater.


Volume: 98 (1)      Pages from: 219  to: 225

KeyWords: Laser Ablation; Double Pulse;
DOI: 10.1007/s00339-009-5379-8

Citations: 13
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