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Proceedings Paper

Laser self-mixing sensor to monitor in situ the penetration depth during short pulse laser drilling of metal targets
Author(s): Francesco P. Mezzapesa; Antonio Ancona; Teresa Sibillano; Francesco De Lucia; Maurizio Dabbicco; Pietro Mario Lugarà; Gaetano Scamarcio
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Paper Abstract

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.

Paper Details

Date Published: 27 May 2011
PDF: 5 pages
Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 808245 (27 May 2011); doi: 10.1117/12.898101
Show Author Affiliations
Francesco P. Mezzapesa, CNR-IFN UOS Bari (Italy)
Politecnico di Bari (Italy)
Antonio Ancona, CNR-IFN UOS Bari (Italy)
Teresa Sibillano, CNR-IFN UOS Bari (Italy)
Francesco De Lucia, CNR-IFN UOS Bari (Italy)
Univ. degli Studi di Bari (Italy)
Maurizio Dabbicco, CNR-IFN UOS Bari (Italy)
Univ. degli Studi di Bari (Italy)
Pietro Mario Lugarà, CNR-IFN UOS Bari (Italy)
Univ. degli Studi di Bari (Italy)
Gaetano Scamarcio, CNR-IFN UOS Bari (Italy)
Univ. degli Studi di Bari (Italy)


Published in SPIE Proceedings Vol. 8082:
Optical Measurement Systems for Industrial Inspection VII
Peter H. Lehmann; Wolfgang Osten; Kay Gastinger, Editor(s)

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