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Long-duration nano-second single pulse lasers for observation of spectra from bulk liquids at high hydrostatic pressures

Long-duration nano-second single pulse lasers for observation of spectra from bulk liquids at high hydrostatic pressures
Long-duration nano-second single pulse lasers for observation of spectra from bulk liquids at high hydrostatic pressures
The influence of laser pulse duration on the spectral emissions observed from bulk ionic solutions has been investigated for hydrostatic pressures between 0.1 and 30 MPa. Transient pressure, shadowgraph imaging and spectroscopic measurements were performed for single pulses of duration 20 and 150 ns. The transient pressure measurements show that for hydrostatic pressures up to 30 MPa, propagation of the high-pressure shockwave generated by the focused laser causes the local pressure to reduce below ambient levels during the time frame that spectroscopic measurements can be made. The pressure impulse and subsequent reduction in pressure are larger, with the latter lasting longer for the 150 ns pulse compared to a 20 ns pulse of the same energy. The 150 ns pulse generates larger cavities with significant enhancement of the spectral emissions observed compared to the 20 ns duration pulse for pressures up to 30 MPa. The results demonstrate that laser-induced breakdown using a long ns duration pulse offers an advantage over conventional, short ns duration pulses for the analysis of bulk ionic solutions at hydrostatic pressures between 0.1 and 30 MPa.
0584-8547
7-12
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Sakka, Tetsuo
fd41ffee-1abd-46cb-99dc-94bb96aecc38
Masamura, Tatsuya
f5185ed1-48fa-48c2-8788-09e91f1dc707
Tamura, Ayaka
3f8146ef-01c2-43b6-9f4c-3f4650c3c144
Takahashi, Tomoko
3f3f98c5-993c-4e11-b5ec-0fa4dbdbced9
Matsumoto, Ayumu
189e9690-f8b7-449a-8ca6-ee3e88c99d64
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Sakka, Tetsuo
fd41ffee-1abd-46cb-99dc-94bb96aecc38
Masamura, Tatsuya
f5185ed1-48fa-48c2-8788-09e91f1dc707
Tamura, Ayaka
3f8146ef-01c2-43b6-9f4c-3f4650c3c144
Takahashi, Tomoko
3f3f98c5-993c-4e11-b5ec-0fa4dbdbced9
Matsumoto, Ayumu
189e9690-f8b7-449a-8ca6-ee3e88c99d64

Thornton, Blair, Sakka, Tetsuo, Masamura, Tatsuya, Tamura, Ayaka, Takahashi, Tomoko and Matsumoto, Ayumu (2014) Long-duration nano-second single pulse lasers for observation of spectra from bulk liquids at high hydrostatic pressures. Spectrochimica Acta Part B Atomic Spectroscopy, 97, 7-12. (doi:10.1016/j.sab.2014.04.008).

Record type: Article

Abstract

The influence of laser pulse duration on the spectral emissions observed from bulk ionic solutions has been investigated for hydrostatic pressures between 0.1 and 30 MPa. Transient pressure, shadowgraph imaging and spectroscopic measurements were performed for single pulses of duration 20 and 150 ns. The transient pressure measurements show that for hydrostatic pressures up to 30 MPa, propagation of the high-pressure shockwave generated by the focused laser causes the local pressure to reduce below ambient levels during the time frame that spectroscopic measurements can be made. The pressure impulse and subsequent reduction in pressure are larger, with the latter lasting longer for the 150 ns pulse compared to a 20 ns pulse of the same energy. The 150 ns pulse generates larger cavities with significant enhancement of the spectral emissions observed compared to the 20 ns duration pulse for pressures up to 30 MPa. The results demonstrate that laser-induced breakdown using a long ns duration pulse offers an advantage over conventional, short ns duration pulses for the analysis of bulk ionic solutions at hydrostatic pressures between 0.1 and 30 MPa.

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Accepted/In Press date: 17 April 2014
e-pub ahead of print date: 2 May 2014
Published date: July 2014
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 400011
URI: http://eprints.soton.ac.uk/id/eprint/400011
ISSN: 0584-8547
PURE UUID: 84b491df-f4c3-4826-8a25-9c6849b7469f

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Date deposited: 06 Sep 2016 15:54
Last modified: 09 Jan 2022 09:54

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Contributors

Author: Blair Thornton
Author: Tetsuo Sakka
Author: Tatsuya Masamura
Author: Ayaka Tamura
Author: Tomoko Takahashi
Author: Ayumu Matsumoto

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