Open AccessHeat accumulation in ultra-short pulsed scanning laser ablation of metals
Author(s) -
Franziska Bauer,
Andreas Michalowski,
Thomas Kiedrowski,
Stefan Nolte
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.001035
Subject(s) - materials science , ablation , laser ablation , optics , laser , laser scanning , physics , engineering , aerospace engineering
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.