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Title: Synergetic effects of double laser pulses for the formation of mild plasma in water: toward non-gated underwater laser-induced breakdown spectroscopy.
Authors: Sakka, Tetsuo  kyouindb  KAKEN_id
Tamura, Ayaka
Nakajima, Takashi
Fukami, Kazuhiro  kyouindb  KAKEN_id
Ogata, Yukio H
Author's alias: 作花, 哲夫
Keywords: bubbles
plasma diagnostics
plasma production by laser
Issue Date: May-2012
Publisher: American Institute of Physics
Journal title: The Journal of chemical physics
Volume: 136
Issue: 17
Thesis number: 174201
Abstract: We experimentally study the dynamics of the plasma induced by the double-laser-pulse irradiation of solid target in water, and find that an appropriate choice of the pulse energies and pulse interval results in the production of an unprecedentedly mild (low-density) plasma, the emission spectra of which are very narrow even without the time-gated detection. The optimum pulse interval and pulse energies are 15-30 μs and about ~1 mJ, respectively, where the latter values are much smaller than those typically employed for this kind of study. In order to clarify the mechanism for the formation of mild plasma we examine the role of the first and second laser pulses, and find that the first pulse produces the cavitation bubble without emission (and hence plasma), and the second pulse induces the mild plasma in the cavitation bubble. These findings may present a new phase of underwater laser-induced breakdown spectroscopy.
Rights: © 2012 American Institute of Physics
DOI(Published Version): 10.1063/1.4709391
PubMed ID: 22583223
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