Nanosecond laser ablation of metals in gases observed by photoacoustic and imaging techniques

Yoshiro Ito; Isamu Oguro; Yaushi Fukuzawa; Susumu Nakamura

doi:10.1117/12.407368

16 August 2000 Nanosecond laser ablation of metals in gases observed by photoacoustic and imaging techniques

Yoshiro Ito, Isamu Oguro, Yaushi Fukuzawa, Susumu Nakamura

Proceedings Volume 4065, High-Power Laser Ablation III; (2000) https://doi.org/10.1117/12.407368
Event: High-Power Laser Ablation, 2000, Santa Fe, NM, United States

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.

Citation Download Citation

Yoshiro Ito, Isamu Oguro, Yaushi Fukuzawa, and Susumu Nakamura "Nanosecond laser ablation of metals in gases observed by photoacoustic and imaging techniques", Proc. SPIE 4065, High-Power Laser Ablation III, (16 August 2000); https://doi.org/10.1117/12.407368

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