Contributo in atti di convegno, 2013, ENG, 10.1016/j.phpro.2013.03.136

Influence of the repetition rate and pulse duration on the incubation effect in multiple-shots ultrafast laser ablation of steel

Di Niso, Francesca; Gaudiuso, Caterina; Sibillano, Teresa; Mezzapesa, Francesco Paolo; Ancona, Antonio; Lugarà, Pietro Mario

Consiglio Nazionale delle Ricerche; Universita degli Studi di Bari

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. © 2013 The Authors.

7th International WLT Conference on Lasers in Manufacturing, LiM 2013, pp. 698–707, Munich; Germany, 13-16 May 2013

Keywords

Ablation threshold, Incubation effect, Micro-machining, Ultrafast laser

CNR authors

Mezzapesa Francesco Paolo, Lugara Pietro Mario, Di Niso Francesca, Gaudiuso Caterina, Sibillano Teresa, Ancona Antonio

CNR institutes

IFN – IFN - Sede secondaria di Bari