Method for determination of the volume of material ejected as molten droplets during visible nanosecond ablation

Jennifer M. Fishburn*, Michael J. Withford, David W. Coutts, James A. Piper

*Corresponding author for this work

Research output: Contribution to journalArticle

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A novel method is presented for determining the volume of molten material ejected from a substrate as a result of visible pulsed-laser ablation. A 100-μm-wide pulsed-laser light sheet (τ ∼ 5 ns, λ. = 532 nm) was used in conjunction with a CCD camera to provide high-speed cross-sectional images of single-pulse ablation of aluminum with a visible nanosecond laser source. Computational analysis of the two-dimensional gray-scale images was used to determine the total volume of material ejected from the substrate in the form of molten droplets. Ablation with dual-wavelength (511- and 578-nm) pulses of 30-ns duration was characterized under various fluence conditions (0-25 J cm-2), allowing a quantitative threshold for explosive melt ejection in aluminum to be established at ∼10 J cm-2. The temporal evolution of the ejected material showed that, for an incident fluence of ∼40 J cm-2, molten-droplet ejection commenced at ∼400 ns and ceased after ∼2 μs.

Original languageEnglish
Pages (from-to)6473-6476
Number of pages4
JournalApplied Optics
Issue number35
Publication statusPublished - 10 Dec 2004


Bibliographical note

This paper was published in [Applied optics] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: []. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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