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Effects of pulse width on nascent laser-induced bubbles for underwater laser-induced breakdown spectroscopy

Effects of pulse width on nascent laser-induced bubbles for underwater laser-induced breakdown spectroscopy
Effects of pulse width on nascent laser-induced bubbles for underwater laser-induced breakdown spectroscopy
The reason for the significant advantage offered by long-pulse (150 ns) irradiation in underwater laser-induced breakdown spectroscopy (LIBS) is investigated from the point of view of the behavior of nascent cavitation bubbles. Shadowgraphs of nascent bubbles generated by pulsed laser irradiation of Cu targets in water were observed for two different pulse widths, 20 ns and 150 ns. It is clearly seen that the nascent bubble is formed at the leading edge of the laser pulse profile, regardless of the pulse width. Bubbles generated by a 20-ns pulse are characterized by a flat-shape filled with dense matter with intense optical emission, which is in contrast to more hemispherical low-density bubbles observed under the irradiation by a 150-ns pulse. The behavior of the nascent bubbles is consistent with the behavior of the later plasma in the bubbles, which is crucial for observation of well-defined atomic spectral lines for underwater LIBS.
0584-8547
94-98
Sakka, Tetsuo
fd41ffee-1abd-46cb-99dc-94bb96aecc38
Tamura, Ayaka
3f8146ef-01c2-43b6-9f4c-3f4650c3c144
Matsumoto, Ayumu
189e9690-f8b7-449a-8ca6-ee3e88c99d64
Fukami, Kazuhiro
8df48c6e-64df-4e85-8a1b-85377be60550
Nishi, Naoya
16b40aa6-df01-4bf7-9bf1-4508ca615686
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Sakka, Tetsuo
fd41ffee-1abd-46cb-99dc-94bb96aecc38
Tamura, Ayaka
3f8146ef-01c2-43b6-9f4c-3f4650c3c144
Matsumoto, Ayumu
189e9690-f8b7-449a-8ca6-ee3e88c99d64
Fukami, Kazuhiro
8df48c6e-64df-4e85-8a1b-85377be60550
Nishi, Naoya
16b40aa6-df01-4bf7-9bf1-4508ca615686
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9

Sakka, Tetsuo, Tamura, Ayaka, Matsumoto, Ayumu, Fukami, Kazuhiro, Nishi, Naoya and Thornton, Blair (2014) Effects of pulse width on nascent laser-induced bubbles for underwater laser-induced breakdown spectroscopy. Spectrochimica Acta Part B Atomic Spectroscopy, 97, 94-98. (doi:10.1016/j.sab.2014.05.009).

Record type: Article

Abstract

The reason for the significant advantage offered by long-pulse (150 ns) irradiation in underwater laser-induced breakdown spectroscopy (LIBS) is investigated from the point of view of the behavior of nascent cavitation bubbles. Shadowgraphs of nascent bubbles generated by pulsed laser irradiation of Cu targets in water were observed for two different pulse widths, 20 ns and 150 ns. It is clearly seen that the nascent bubble is formed at the leading edge of the laser pulse profile, regardless of the pulse width. Bubbles generated by a 20-ns pulse are characterized by a flat-shape filled with dense matter with intense optical emission, which is in contrast to more hemispherical low-density bubbles observed under the irradiation by a 150-ns pulse. The behavior of the nascent bubbles is consistent with the behavior of the later plasma in the bubbles, which is crucial for observation of well-defined atomic spectral lines for underwater LIBS.

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More information

Accepted/In Press date: 12 May 2014
e-pub ahead of print date: 22 May 2014
Published date: 1 July 2014
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 400012
URI: http://eprints.soton.ac.uk/id/eprint/400012
ISSN: 0584-8547
PURE UUID: 931e8e08-a449-434a-a257-73f32799786c

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Date deposited: 06 Sep 2016 15:55
Last modified: 08 Jan 2022 15:39

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Contributors

Author: Tetsuo Sakka
Author: Ayaka Tamura
Author: Ayumu Matsumoto
Author: Kazuhiro Fukami
Author: Naoya Nishi
Author: Blair Thornton

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