TY - JOUR
T1 - Effect of surface roughness on the ultrashort pulsed laser ablation fluence threshold of zinc and steel
AU - Mustafa, Hasib
AU - Mezera, Marek
AU - Matthews, David Thomas Allan
AU - Römer, Gerardus Richardus, Bernardus, Engelina
N1 - Funding Information:
The authors would like to acknowledge the financial support of Tata Steel Nederland Technology BV. We would also like to thank Dr. B. Pathiraj of the University of Twente for his fruitful discussions on this topic and R. Roos, R.J. van Dasselaar, R.M. Reef, M. Veugelers, K.J. Smelt, W. R. Pot, S.J. van Haaren and R.C. Gerritsen for their help with the experimental work. Appendix A
Publisher Copyright:
© 2019
PY - 2019/9/15
Y1 - 2019/9/15
N2 - The single and multiple pulse laser ablation threshold of zinc and steel at picosecond laser pulse duration is studied as a function of initial surface roughness at laser wavelengths of 515 and 1030 nm. The initial surface topographies and the resulting crater morphologies are analyzed using confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). Reflectivity measurements of the initial surfaces show increased absorptivity with increasing surface roughness. It was found that the single pulse ablation threshold increases with increasing effective surface area; the latter resulting from surface roughness. Rougher surfaces tend to have a higher degree of incubation as well. From the experimental and simulation results, it appears that the absorbed energy contributes more to residual heat than to material ablation when effective surface area increases.
AB - The single and multiple pulse laser ablation threshold of zinc and steel at picosecond laser pulse duration is studied as a function of initial surface roughness at laser wavelengths of 515 and 1030 nm. The initial surface topographies and the resulting crater morphologies are analyzed using confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). Reflectivity measurements of the initial surfaces show increased absorptivity with increasing surface roughness. It was found that the single pulse ablation threshold increases with increasing effective surface area; the latter resulting from surface roughness. Rougher surfaces tend to have a higher degree of incubation as well. From the experimental and simulation results, it appears that the absorbed energy contributes more to residual heat than to material ablation when effective surface area increases.
KW - Ablation threshold
KW - Galvanized steel
KW - Polycrystalline zinc
KW - Surface roughness
KW - Titanium stabilized ultra-low carbon steel
KW - Ultrashort pulsed laser
UR - http://www.scopus.com/inward/record.url?scp=85066445475&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2019.05.066
DO - 10.1016/j.apsusc.2019.05.066
M3 - Article
VL - 488
SP - 10
EP - 21
JO - Applied surface science
JF - Applied surface science
SN - 0169-4332
ER -