Influence of irradiation conditions on plume expansion induced by femtosecond laser ablation of gold and copper

Sylvie Noël; Jörg Hermann

doi:10.1117/12.755971

1 August 2007 Influence of irradiation conditions on plume expansion induced by femtosecond laser ablation of gold and copper

Sylvie Noël, Jörg Hermann

Author Affiliations +

Proceedings Volume 6785, ROMOPTO 2006: Eighth Conference on Optics; 67850F (2007) https://doi.org/10.1117/12.755971
Event: ROMOPTO 2006: Eighth Conference on Optics, 2006, Sibiu, Romania

Abstract

The influence of the irradiation conditions on plume expansion induced by femtosecond laser ablation of gold and copper is investigated experimentally involving measurements of the ablated mass, plasma diagnostics, and analysis of the nanoparticle size distribution. The targets were irradiated under vacuum with a spot of uniform energy distribution. Only a few laser pulses were applied to each irradiation site to make sure that the plume expansion dynamics were not altered by the depth of the laser-produced crater. Under these conditions, two main components were observed by fast imaging. They were identified by optical emission spectroscopy: the fast component is composed of atoms and ions whereas the slow one mainly contains nanoparticles. Experiments show that the velocities of plasma species depend weakly on laser fluence. Deposition of nanoparticles on a substrate and analyses by atomic force microscopy show that the size distribution of nanoparticles does not exhibit a maximum and the particle abundance monotonously decreases with size. Furthermore, the results indicate that two populations of nanoparticles exist within the plume: small clusters that are more abundant in the fast frontal plume component, and larger particles that are located mostly at the back. It is shown that the ablation efficiency is strongly related to the presence of nanoparticles in the plume.

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Sylvie Noël and Jörg Hermann "Influence of irradiation conditions on plume expansion induced by femtosecond laser ablation of gold and copper", Proc. SPIE 6785, ROMOPTO 2006: Eighth Conference on Optics, 67850F (1 August 2007); https://doi.org/10.1117/12.755971

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