Bauer Franziska, Michalowski Andreas, Kiedrowski Thomas, Nolte Stefan
Opt Express. 2015 Jan 26;23(2):1035-43. doi: 10.1364/OE.23.001035.
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.
在金属的超短脉冲激光材料加工中，高平均激光功率会对烧蚀质量产生严重的不利影响。关于扫描速度，观察到在光滑、反光的表面和不平、暗黑的烧蚀表面之间存在明显的转变。通过研究样品温度的影响，实验表明这种效应源于热积累。在数值热流模拟中，确定了表明烧蚀质量变化的临界扫描速度，其与实验数据吻合良好。
