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Heat accumulation in ultra-short pulsed scanning laser ablation of metals

: Bauer, Franziska; Michalowski, Andreas; Kiedrowski, Thomas; Nolte, Stefan

Postprint (2.7 MByte; PDF; )

Optics Express 23 (2015), No.2, pp.1035-1043
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

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.