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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4181

Title: Femtosecond laser ablation of silver foil with single and double pulses
Authors: Roberts, DE
Du Plessis, A
Botha, LR
Keywords: Femtosecond metal ablation
Double pulse ablation
Nanoparticle deposition
Femto-LIBS
Silver nanoparticles
Issue Date: 2009
Publisher: Elsevier
Citation: Roberts, DE, Du Plessis, A and Botha, LR. 2009. Femtosecond laser ablation of silver foil with single and double pulses. Applied Surface Science, Vol 256(6), pp 1784-1792
Abstract: The average ablation depth per pulse of silver foil by 130 fs laser pulses has been measured in vacuum over a range of three orders of magnitude of pulse fluence up to 900 J cm_2. In addition, double pulses with separations up to 3.4 ns have been used to probe time scales of relevance for femtosecond ablation. The double pulse ablation depth, when each pulse fluence is 0.7 J cm_2, falls to that of a single pulse as the pulse separation is increased from 0 ps to 700 ps. This time scale decreases to only 4 ps as the fluence is increased to 11 J cm_2. It then jumps to 500 ps across a transition fluence where the slope of the ablation depth versus logarithmic fluence characteristic changes abruptly to a higher value. In addition, for pulse separations near 1000 ps, the second pulse can cause re-deposition of ejecta from the first pulse resulting in a double pulse ablation depth only 40% that of the first pulse alone. This has important implications for the interpretation of double pulse femto-LIBS intensities. Our results suggest that the optical properties of nano or mesoparticles play a significant role in double pulse ablation with large pulse separations
Description: Copyright: 2009 Elsevier. This is the post-print version. The definitive version is published in the Applied Surface Science Journal, Vol 256(6), pp 1784-1792
URI: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6THY-4XDMHBS-6-W&_cdi=5295&_user=958262&_pii=S0169433209014202&_orig=search&_coverDate=01/01/2010&_sk=997439993&view=c&wchp=dGLzVlz-zSkzk&md5=b7a2a0168cc33a93f6cb02e9e35b2265&ie=/sdarticle.pdf
http://hdl.handle.net/10204/4181
ISSN: 0169-4332
Appears in Collections:Laser physics and technology
General science, engineering & technology

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