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Investigation of the photoacoustic signal dependence on laser power
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-8355-2414
2008 (English)In: Advanced Laser Technologies 2007: Proceedings of the Advanced Laser Technologies 2007 Conference / [ed] Ivan A. Shcherbakov; Risto Myllylä; Alexander V. Priezzhev; Matti Kinnunen; Vladimir I. Pustovoy; Mikhail Y. Kirillin; Alexey P. Popov, SPIE - International Society for Optical Engineering, 2008, p. 70220C-Conference paper, Published paper (Refereed)
Abstract [en]

In this study we have focused on exploring the photoacoustic signal generated by laser induced dielectric breakdown process in pure water, under normal conditions. In this case the dielectric breakdown will lead to a formation of a shock wave. We investigated the relation between pulse energy and amplitude, group velocity and power spectrum of the shock wave. Also, the threshold for dielectric breakdown is estimated. A pulsed, high power Nd:YAG laser with λ = 532 nm and a pulse duration of 12 ns was used. The laser pulse energy ranges from 0.1 mJ to 7.4 mJ. Only photoacoustic signals generated from dielectric breakdown was considered. We found that the amplitude and the average group velocity of the shock wave correlates to the laser pulse energy. The frequency contents of the photoacoustic signal changes due to both non-linear behaviour and dissipative effects. We estimated the dielectric breakdown threshold to be 0.44 × 1011Wcm-2.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2008. p. 70220C-
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 7022
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Applied Mechanics
Research subject
Industrial Electronics; Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-37024DOI: 10.1117/12.803915Local ID: ae4f3540-70cf-11dc-a60c-000ea68e967bOAI: oai:DiVA.org:ltu-37024DiVA, id: diva2:1010522
Conference
International Conference on Advanced Laser Technologies : 03/09/2007 - 07/09/2007
Note
Validerad; 2008; 20071002 (tlt)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

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Löfqvist, TorbjörnNiemi, JanGren, Per
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