Journal
OPTICS EXPRESS
Volume 23, Issue 2, Pages 1035-1043Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.001035
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High average laser powers can have a serious adverse impact on the ablation quality in ultra-short pulsed laser material processing of metals. With respect to the scanning speed, a sharp transition between a smooth, reflective and an uneven, dark ablated surface is observed. Investigating the influence of the sample temperature, it is experimentally shown that this effect stems from heat accumulation. In a numerical heat flow simulation, the critical scanning speed indicating the change in ablation quality is determined in good agreement with the experimental data. (C) 2015 Optical Society of America
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