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Femtosecond laser ablation of brass: A study of surface morphology and ablation rate

Published online by Cambridge University Press:  10 July 2012

Mohamed E. Shaheen  and
Brian J. Fryer
Mohamed E. Shaheen*
Affiliation:
Great Lakes Institute for Environmental Research, University of Windsor, Windsor, Ontario, Canada Department of Physics, Faculty of Sciences, Tanta University, Tanta, Egypt
Brian J. Fryer
Affiliation:
Great Lakes Institute for Environmental Research, University of Windsor, Windsor, Ontario, Canada Department of Earth and Environmental Sciences, University of Windsor, Windsor, Ontario, Canada
*
Address correspondence and reprint requests to: Mohamed E. Shaheen, Great Lakes Institute for Environmental Research, University of Windsor, Windsor, Ontario, CanadaN9B 3P4. E-mail: mshaheen@uwindsor.ca
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Abstract

The interaction of near infrared femtosecond laser pulses with a Cu based alloy (brass) in ambient air at atmospheric pressure and under different laser conditions was investigated. The effects of laser fluence and number of pulses on surface morphology and ablation rate were studied using scanning electron microscopy (SEM) and optical microscopy. Ablation rates were found to rapidly increase from 83 to 604 nm/pulse in the fluence range 1.14–12.21 J/cm2. At fluence >12.21 J/cm2, ablation rates increased slowly to a maximum (607 nm/pulse at 19.14 J/cm2), and then decreased at fluence higher than 20.47 J/cm2 to 564 nm/pulse at 24.89 J/cm2. Large amounts of ablated material in a form of agglomerated fine particles were observed around the ablation craters as the number of laser pulses and fluence increased. The study of surface morphology shows reduced thermal effects with femtosecond laser ablation in comparison to nanosecond laser ablation at low fluence.

Keywords

BrassFemtosecond laserLaser ablationScanning electron microscopy

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Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 3 , September 2012 , pp. 473 - 479
Copyright
Copyright © Cambridge University Press 2012

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