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Proceedings Paper

Acoustic monitoring of modulated laser beam processing of metals
Author(s): Hongping Gu; Robert E. Mueller; Walter W. Duley
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Paper Abstract

We observe sharp resonant emission at discrete acoustic frequencies during the laser processing of metals with pulsed and CW laser radiation. This emission can be dramatically enhanced when modulated or pulsed beam excitation is used. We discuss the origin of this effect in terms of a model which involves the excitation of normal modes of vibration for the laser keyhole, or liquid layer on the surface of the metal being processed. Eigenfrequencies associated with these modes form a band of allowed acoustic frequencies. When a harmonic of the beam modulation frequency falls within such a band, the acoustic signal is resonantly enhanced. The response of the system contains both driven and noise signals. Monitoring of discrete components may yield important new diagnostic information of value in determining optimized process conditions.

Paper Details

Date Published: 8 April 1996
PDF: 11 pages
Proc. SPIE 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics, (8 April 1996); doi: 10.1117/12.237717
Show Author Affiliations
Hongping Gu, Univ. of Waterloo (Canada)
Robert E. Mueller, Univ. of Waterloo (Canada)
Walter W. Duley, Univ. of Waterloo (Canada)

Published in SPIE Proceedings Vol. 2703:
Lasers as Tools for Manufacturing of Durable Goods and Microelectronics
Jan J. Dubowski; Jyotirmoy Mazumder; Leonard R. Migliore; Chandrasekhar Roychoudhuri; Ronald D. Schaeffer, Editor(s)

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