title: Heat accumulation in ultra-short pulsed scanning laser ablation of metals.
abstract: 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.
authors.forename: Franziska
authors.initials: F
authors.lastname: Bauer
authors.forename: Andreas
authors.initials: A
authors.lastname: Michalowski
authors.forename: Thomas
authors.initials: T
authors.lastname: Kiedrowski
authors.forename: Stefan
authors.initials: S
authors.lastname: Nolte