Influence of the Repetition Rate and Pulse Duration on the Incubation Effect in Multiple-Shots Ultrafast Laser Ablation of Steel

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• 作者：F. Di Nisop>ap>p> ; p>p>bp> ; C. Gaudiusop>ap>p> ; p>p>bp> ; T. Sibillanop>ap> ; F.P. Mezzapesap>ap>p> ; p>p>bp> ; A. Anconap>ap>p> ; p>p>antonio.ancona@uniba.itp> ; P.M. Lugar&agrave ; p>ap>p> ; p>p>bp>
• 关键词：Ultrafast laser ; Micro-machining ; Ablation threshold ; Incubation effect
• 刊名：Physics Procedia
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：41
• 期：Complete
• 页码：691-700
• 全文大小：2013 K

文摘

We report on an experimental study of the incubation effect during laser ablation of stainless steel with fs- and ps-pulses at high repetition rates. Ablation thresholds for multiple pulses N have been estimated. As expected, the ablation threshold decreases with N due to damage accumulation. The related incubation coefficient has been determined at different repetition rates, from 50-kHz to 1-MHz and two pulse durations: 650-fs and 10-ps. Results show that the incubation effect is lower for fs-pulses below 600 kHz. At higher repetition rates incubation is more pronounced regardless of the pulse duration, probably due to heat accumulation.