Abstract
The dependence on laser wavelength of the process of nanoparticle generation by ultrashortlaser ablation of solid matter in a vacuum has been investigated both experimentally andtheoretically. The study has been carried out for a Ni target by using laser pulses of≈300 fs duration at two different laser wavelengths: in the visible(λ = 527 nm) andultraviolet (λ = 263 nm), respectively. The size distribution of the nanoparticles, which is quite broad in thecase of visible light, becomes significantly narrower and slightly shifts towards smaller sizesfor ultraviolet light. Molecular dynamics simulations confirm the dependence of theprocess on the laser wavelength by showing that the laser photon energy affects thematerial relaxation and, thus, the nanoparticle generation process. This, in turn,indicates that the photon energy can be used as an effective parameter to controlthe nanoparticle size distribution in femtosecond laser ablation of solid matter.
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