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Comparison of the laser ablation process on Zn and Ti using pulsed digital holographic interferometry
Faculty
Science
Year:
2010
Type of Publication:
Article
Pages:
4633-4641
Authors:
Amer, E, Gren, P, Kaplan, A. F. H, Sjodahl, M, El Shaer, M
DOI:
10.1016/j.apsusc.2010.02.063
Journal:
APPLIED SURFACE SCIENCE ELSEVIER SCIENCE BV
Volume:
256
Research Area:
Chemistry; Materials Science; Physics
ISSN
ISI:000276629300039
Keywords :
Laser ablation, Metals, Pulsed digital holographic interferometry
Abstract:
Pulsed digital holographic interferometry has been used to compare the laser ablation process of a Q-switched Nd-YAG laser pulse (wavelength 1064 nm, pulse duration 12 ns) on two different metals (Zn and Ti) under atmospheric air pressure. Digital holograms were recorded for different time delays using collimated laser light (532 nm) passed through the volume along the target. Numerical data of the integrated refractive index field were calculated and presented as phase maps. Intensity maps were calculated from the recorded digital holograms and are used to calculate the attenuation of the probing laser beam by the ablated plume. The different structures of the plume, namely streaks normal to the surface for Zn in contrast to absorbing regions for Ti, indicates that different mechanisms of laser ablation could happen for different metals for the same laser settings and surrounding gas. At a laser fluence of 5J/cm(2), phase explosion appears to be the ablation mechanism in case of Zn, while for Ti normal vaporization seems to be the dominant mechanism. (C) 2010 Elsevier B. V. All rights reserved.
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