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Proceedings Paper

Mechanism of laser ablation in liquid media investigated by using long-lasting lanthanide emission as a probe
Author(s): Kouichi Hirata; Satoru Masai; Tetsuo Sakka; Yukio H. Ogata
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Paper Abstract

Laser ablation of Eu2O3 in water has been studied by emission spectroscopy and shadowgraphy. In the emission spectra, many emission lines appear in the visible region and last for a millisecond. In the early time range from the ablation pulse shot, most of them are assigned to Eu atoms and Eu+ ions. Among them, the emission lines originated from the transition to the ground state of both species show the self-reversed profile. It indicates that both Eu atoms and Eu+ ions in their ground state are abundant in the peripheral region of the plume. In a later time range, the emission lines originated from trivalent Eu species (Eu2O3 nanoparticles) appear and last for a long time. In the shadowgraphs, the gas cavity-like plume expands, shrinks, and collapses with time. Based on the obtained results, we revealed that the chemical reactions following the laser ablation phenomenon in liquid does not end only in the plume, but also proceeds in the surrounding liquid phase. By using the long-lasting lanthanide emission as a probe, the information about the distribution of the ablated species in the plume can be obtained as long as milliseconds. The mechanism of the particle formation can also be discussed.

Paper Details

Date Published: 12 April 2005
PDF: 8 pages
Proc. SPIE 5713, Photon Processing in Microelectronics and Photonics IV, (12 April 2005); doi: 10.1117/12.587477
Show Author Affiliations
Kouichi Hirata, Kyoto Univ. (Japan)
Satoru Masai, Kyoto Univ. (Japan)
Tetsuo Sakka, Kyoto Univ. (Japan)
Yukio H. Ogata, Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 5713:
Photon Processing in Microelectronics and Photonics IV
Jim Fieret; David B. Geohegan; Friedrich G. Bachmann; Willem Hoving; Frank Träger; Peter R. Herman; Jan J. Dubowski; Tatsuo Okada; Kunihiko Washio; Yongfeng Lu; Craig B. Arnold, Editor(s)

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