Dynamics of the plume produced by nanosecond ultraviolet laser ablation of metals

Bo Toftmann Christensen, Jørgen Schou, J.G. Lunney

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The dynamics of the ablation plume of a partially ionized plasma produced by a nanosecond UV laser with different irradiation spot geometries has been explored. We have used an ensemble of quartz crystal microbalances to make the first systematic and quantitative study of how the shape of the plume varies as the aspect ratio (b/a) of the elliptical laser spot is varied by about a factor of ten. The flip-over effect can be described by the adiabatic expansion model of Anisimov using a value of the adiabatic constant of about gamma = 1.4. We have also studied the forward peaking of the ablation plume for a large number of metals at the same laser fluence. Contrary to earlier reports, we find that the more refractory metals have the broader angular distributions.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume67
    Issue number10
    Pages (from-to)104101
    Number of pages5
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2003

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