Influence of stress confinement, particle shielding and re-deposition on the ultrashort pulse laser ablation of metals revealed by ultrafast time-resolved experiments
Spellauge M, Winter J, Rapp S, McDonnell C, Sotier F, Schmidt M, Huber HP (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 545
Article Number: 148930
DOI: 10.1016/j.apsusc.2021.148930
Abstract
The ablation rate in double-pulse material processing is strongly influenced by the pulse separation. For pulse separations exceeding 3 ps a significant decrease in ablation volume has been observed. This was attributed to three mechanisms: rarefaction wave interaction, shielding by ablation plume and material re-deposition. Here we present carefully designed double-pulse ablation experiments on three industrially relevant metals: stainless steel, aluminum and copper and interpret them based on ablation dynamics derived from ultrafast time-resolved pump-probe microscopy and ellipsometry. Adjustment of the fluence distribution within the double-pulse allows us to separate effects arising from rarefaction wave suppression and shielding/re-deposition. We found that the rarefaction wave contribution to the double-pulse ablation volume is about 25% for aluminum and stainless steel and about 40% for copper. A pronounced re-deposition was observed for stainless steel and aluminum, while for copper shielding by the ablation plume plays a dominant role. It was revealed that the ablation volume stays maximal, if the pulse energy is deposited within the mechanical relaxation time of (2 – 5) ps. According to our findings the ablation process exerts maximum efficiency and precision, when energy is coupled into the material before mechanical relaxation or after material surface equilibration.
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Germany (DE)How to cite
APA:
Spellauge, M., Winter, J., Rapp, S., McDonnell, C., Sotier, F., Schmidt, M., & Huber, H.P. (2021). Influence of stress confinement, particle shielding and re-deposition on the ultrashort pulse laser ablation of metals revealed by ultrafast time-resolved experiments. Applied Surface Science, 545. https://dx.doi.org/10.1016/j.apsusc.2021.148930
MLA:
Spellauge, Maximilian, et al. "Influence of stress confinement, particle shielding and re-deposition on the ultrashort pulse laser ablation of metals revealed by ultrafast time-resolved experiments." Applied Surface Science 545 (2021).
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