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Impact of an extended source in laser ablation using pulsed digital holographic interferometry and modelling
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.ORCID-id: 0000-0003-4853-870X
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.ORCID-id: 0000-0001-8355-2414
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.ORCID-id: 0000-0002-3569-6795
2009 (engelsk)Inngår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 255, nr 21, s. 8917-8925Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2009. Vol. 255, nr 21, s. 8917-8925
HSV kategori
Forskningsprogram
Experimentell mekanik; Produktionsutveckling
Identifikatorer
URN: urn:nbn:se:ltu:diva-13327DOI: 10.1016/j.apsusc.2009.06.095ISI: 000268506100033Scopus ID: 2-s2.0-67651171177Lokal ID: c8d00260-6730-11de-9f57-000ea68e967bOAI: oai:DiVA.org:ltu-13327DiVA, id: diva2:986280
Merknad
Validerad; 2009; 20090702 (ysko)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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