Contributo in atti di convegno, 2011, ENG, 10.1117/12.898101

Laser self-mixing sensor to monitor in-situ the penetration depth during short pulse laser drilling of metal targets

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

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

Direct real-time measurements of the penetration depth during laser micromachining has been demonstrated by developing a novel ablation sensor based on laser diode feedback interferometry. Percussion drilling experiments have been performed by focusing a 120-ps pulsed fiber laser onto metallic targets with different thermal conductivity. In-situ monitoring of the material removal rate was achieved by coaxially aligning the beam probe with the ablating laser. The displacement of the ablation front was revealed with sub-micrometric resolution by analyzing the sawtooth-like induced modulation of the interferometric signal out of the detector system.

Optical Measurement Systems for Industrial Inspection VII, pp. 808245–?, Munich; Germany, 23-26 May 2011

Keywords

Ablation fronts, Ablation rates, Detector systems, In-situ, In-situ monitoring, Interferometric signals, Laser micro-machining, Laser sensor, Material removal rate, Metal target, Metallic targets, Percussion drilling, Pulsed fiber lasers, Real time measurements, Self-mixing, Short-pulse lasers, Feedback, Fiber lasers, Interferometry, Measurements, Optical data processing, Optical feedback, Optical testing, Optical variables measurement, Sensors, Ablation

CNR authors

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

CNR institutes

IFN – IFN - Sede secondaria di Bari