Abstract
We report the formation of microtower structures, observed on multishot nanosecond laser irradiation of liquid metals (Ga, In, Sn–Pb alloy, Wood’s metal). Ablation in a reactive ambient gas (air, nitrogen, sulfur hexafluoride, nitrogen trifluoride) is shown to lead to a tower-like structure growing on the irradiated surface at a rate of 3–20 μm per pulse depending on laser fluence and the types of metal and ambient gas. The interplay between different processes in the heat-affected zone of the irradiated samples is analyzed, including ablation, thermal expansion, temperature variations of viscosity, surface tension, thermal stresses, capillary effects, and surface chemistry. A clear picture of microtower origin has been established, and qualitative modeling can explain the formation mechanism.
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Bulgakova, N.M., Panchenko, A.N., Tel’minov, A.E. et al. Formation of microtower structures on nanosecond laser ablation of liquid metals. Appl. Phys. A 98, 393–400 (2010). https://doi.org/10.1007/s00339-009-5395-8
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DOI: https://doi.org/10.1007/s00339-009-5395-8