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Proceedings Paper

Optical and acoustical monitoring of material processing with Q-switched Nd:YAG and excimer laser radiation
Author(s): C. Stauter; Joel Fontaine; Thierry Engel; Alain P. Biernaux
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Paper Abstract

Characterization of the effects of the interaction between short laser pulses and a material has been made in the conditions of surface cleaning and surface micro-machining. Fast heating of the target surface results in a pressure wave that propagates inside the sample and a shock wave in the surrounding gas medium. By monitoring the energy of the shock wave using a microphone and a piezoelectric transducer, it is possible to relate the ablation rate to the observed signals. Experiments have been made using Nd:YAG and KrF lasers. At high fluences, in particular at 1.06 micrometers , gas breakdown drastically alters the process conditions and disperse the recorded data. By using an additional optical beam deflection technique, we have determined the range of validity for monitoring of the process using simple detection devices.

Paper Details

Date Published: 4 November 1994
PDF: 9 pages
Proc. SPIE 2246, Laser Materials Processing and Machining, (4 November 1994); doi: 10.1117/12.193116
Show Author Affiliations
C. Stauter, Laser Application Lab, Ensais (France)
Joel Fontaine, Laser Application Lab, Ensais (France)
Thierry Engel, Laser Application Lab, Ensais (France)
Alain P. Biernaux, Irepa Laser Institute (France)

Published in SPIE Proceedings Vol. 2246:
Laser Materials Processing and Machining
Rolf-Juergen Ahlers; Peter Hoffmann; Hermann Lindl; Ruediger Rothe, Editor(s)

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