Contributo in atti di convegno, 2011, ENG

Direct in-situ measurement of the ablation rate in short pulse laser percussion drilling of metal targets

Mezzapesa F.P., Ancona A., Sibillano T., Di Niso F., De Lucia F., Dabbicco M., Lugarà P.M., Scamarcio G.

Dipartimento Interateneo di Fisica, Università Degli Studi e Politecnico di Bari, via Amendola 173, I-70126 Bari, Italy CNR-IFN UOS Bari, via Amendola 173, I-70126 Bari, Italy

We demonstrate that a non-invasive sensing technique based on optical feedback interferometry is capable to instantaneously measure the ablation front displacement and the removal rate during ultrafast laser percussion drilling of metallic plates. The sawtooth-like modulation of the interferometric signal out of the detecting sensor has been analyzed to reveal the time dependence of the removal depth with sub-micrometric resolution. Various dynamic factors related to the influence of laser pulse duration and peak energy have been assessed by in-situ spatial- and time-dependent characterization all through the ablation process. The importance of realtime measurement of the ablation rate is crucial to improve the basic understanding of ultrafast lasermaterial interactions. Moreover, the detection system results high-sensitive, compact, and easily integrable in most industrial workstations, enabling the development of on-line control to improve the ablation efficiency and the quality of laser micromachining processes.

30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011, pp. 982–986, Orlando, FL; United States, 23-27 October 2011

Keywords

Ablation efficiency, Ablation fronts, Ablation process, Ablation rates, Detecting sensors, Detection system, Dynamic factors, In-situ, In-situ measurement, Interferometric signals, Laser micro-machining, Laser percussion drilling, Laser pulse duration, Laser-material interactions, Metal target, Metallic plate, Non-invasive sensing, On-line controls, Optical feedback interferometry, Peak energy, Real time measurements, Removal depth, Removal rate, Short-pulse lasers, Time dependence, Time-dependent, Ultra-fast, Feedback, Instruments, Interferometry, Micromachining, Percussion welding, Sensors, Ultrafast lasers, Ablation

CNR authors

Dabbicco Maurizio, Scamarcio Gaetano, Mezzapesa Francesco Paolo, Lugara Pietro Mario, De Lucia Francesco, Di Niso Francesca, Sibillano Teresa, Ancona Antonio

CNR institutes

IFN – IFN - Sede secondaria di Bari