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Proceedings Paper

Nanosecond laser ablation of metals in gases observed by photoacoustic and imaging techniques
Author(s): Yoshiro Ito; Isamu Oguro; Yaushi Fukuzawa; Susumu Nakamura
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Paper Abstract

Laser ablation of some metals in gases induced by nanosecond Nd:YAG laser has been studied by both photoacoustic and fast imaging techniques. Photoacoustic technique using piezoelectric polymer film revealed the change of coupling among laser radiation, ablated matter, plasma and target as a function of the laser fluence. Nanosecond imaging technique showed surface phenomena during and immediately after the ablating laser pulse. Photoacoustic signal intensity as a function of laser fluence was measured at constant pulse energy. It is constant at low fluence, starts to increase with fluence at certain threshold, reaches the maximum and then decreases gradually with increasing fluence. At fluence higher than about 7 J/cm2, there appeared jet-like plasma growing toward incident laser beam at velocities of as high as 105 ms-1 in addition to the laser induced plume. The jet grew during the laser pulse and when the pulse terminated, its rapid growth stopped. At lower fluence, laser induced plasma expanding at about 104 ms-1 was observed. The growth speed of the jet-like plasma depended on laser fluence and gas atmosphere but did not change for different metals.

Paper Details

Date Published: 16 August 2000
PDF: 9 pages
Proc. SPIE 4065, High-Power Laser Ablation III, (16 August 2000); doi: 10.1117/12.407368
Show Author Affiliations
Yoshiro Ito, Nagaoka Univ. of Technology (Japan)
Isamu Oguro, Nagaoka Univ. of Technology (Japan)
Yaushi Fukuzawa, Nagaoka Univ. of Technology (Japan)
Susumu Nakamura, Nagaoka College of Technology (Japan)

Published in SPIE Proceedings Vol. 4065:
High-Power Laser Ablation III
Claude R. Phipps, Editor(s)

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