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Impact of an extended source in laser ablation using pulsed digital holographic interferometry and modelling
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4853-870X
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-8355-2414
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0002-3569-6795
2009 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 255, no 21, p. 8917-8925Article in journal (Refereed) Published
Abstract [en]

Pulsed digital holographic interferometry has been used to study the effect of the laser spot diameter on the shock wave generated in the ablation process of an Nd:YAG laser pulse on a Zn target under atmospheric pressure. For different laser spot diameters and time delays, the propagation of the expanding vapour and of the shock wave were recorded by intensity maps calculated using the recorded digital holograms. From the latter phase maps, the refractive index and the density field can be derived. A model was developed that approaches the density distribution, in particular the ellipsoidal expansion characteristics. The induced shock wave has an ellipsoid shape that approaches a sphere for decreasing spot diameter. The ellipsoidal shock waves have almost the same centre offset towards the laser beam and the same aspect ratio for different time steps. The model facilitates the derivation of the particle velocity field. The method provides valuable quantitative results that are discussed, in particular in comparison with the simpler point source explosion theory.

Place, publisher, year, edition, pages
2009. Vol. 255, no 21, p. 8917-8925
National Category
Applied Mechanics Manufacturing, Surface and Joining Technology
Research subject
Experimental Mechanics; Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-13327DOI: 10.1016/j.apsusc.2009.06.095ISI: 000268506100033Scopus ID: 2-s2.0-67651171177Local ID: c8d00260-6730-11de-9f57-000ea68e967bOAI: oai:DiVA.org:ltu-13327DiVA, id: diva2:986280
Note
Validerad; 2009; 20090702 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Amer, EynasGren, PerKaplan, AlexanderSjödahl, Mikael

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