Surface melting of copper by ultrashort laser pulses


Vincenc Obona, J. and Ocelik, V. and Hosson, J.T.M. de and Skolski, J.Z.P. and Mitko, V.S. and Römer, G.R.B.E. and Huis in 't Veld, A.J. (2011) Surface melting of copper by ultrashort laser pulses. In: J.T.M de Hosson & C.A. Brebbia (Eds.), Surface effects and contact mechanics X : computational methods and experiments. WIT transactions on engineering sciences (71). WIT Press, pp. 1-9. ISBN 9781845645304

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Abstract:The main advantage of ultrashort laser pulses in manufacturing technology is their very high removal rate of material and high quality of microstructures with the smallest dimensions at 1 μm level. The accuracy is mainly due to almost absence of thermal diffusion into bulk material. In this paper we report the investigation on polycrystalline Cu sample surface treated by 6.7 ps laser pulses with 1030 nm laser light wavelength. Scanning electron microscopy micrographs reveal the presence of jet-like structures with spherical drop-like endings, solidified spheres and many bubble bursts at even lower fluence than the threshold value for the ablation is. Within the molten material the jet-like features are due to an explosion of bubbles originated in solid-liquid-vapor transitions. In the case of below-threshold irradiation the same objects can be seen along surface scratches, dot contaminations etc., which indicate an increase of the laser light absorption on these inhomogeneities
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