Acoustic monitoring of modulated laser beam processing of metals

Hongping Gu; Robert E. Mueller; Walter W. Duley

doi:10.1117/12.237717

8 April 1996 Acoustic monitoring of modulated laser beam processing of metals

Hongping Gu, Robert E. Mueller, Walter W. Duley

Proceedings Volume 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics; (1996) https://doi.org/10.1117/12.237717
Event: Photonics West '96, 1996, San Jose, CA, United States

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.

Citation Download Citation

Hongping Gu, Robert E. Mueller, and Walter W. Duley "Acoustic monitoring of modulated laser beam processing of metals", Proc. SPIE 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics, (8 April 1996); https://doi.org/10.1117/12.237717

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