Pulse-by-pulse depth profile measurements were performed during femtosecond laser pulse irradiation on copper. The evolution of the ablation depth and the surface roughness during multi-pulse irradiation was investigated using a three-dimensional microscope. We found that a number of pulse irradiation was required to activate constant-rate ablation and the number of pulses depended on the fluence. We conclude that laser-induced embrittlement of a target material plays a decisive role to determine the ablation rate during multiple-pulse irradiation.
Applied Physics A: Materials Science Processing – Springer Journals
Published: Feb 21, 2018
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