Femtosecond laser ablation of metal targets: The physical origin of the power law size distribution of nanoparticles

Wang, Tingyuan; Song, Yuyan; Liu, Chuqian; Wang, Xiaolei; Lin, Li; Liu, Weiwei; Zhang, Nan

doi:10.1016/j.optlastec.2020.106651

Cited by 8 publications

(1 citation statement)

References 51 publications

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“…Ultrashort pulse-laser ablation involves complex thermodynamics and various material-removal mechanisms, e.g. spallation (tensile stress-driven defects-induced material failure), fragmentation (decomposition into clusters of material under ultrahigh stretching rate), vaporization and phase explosion (eruption of superheated liquid and particles), covering space-time multi scales [1][2][3]. The ultrafast ablation is achieved with extreme physical conditions induced by high-density photon energy at femto or picosecond-time regions.…”

Section: Introductionmentioning

confidence: 99%

Critical pulse in multi-shot femtosecond laser ablation on metallic surfaces

Wang,

Kong,

et al. 2024

Nanotechnology

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Thermal effect remains a thorny issue for femtosecond-laser surface engineering and nanostructuring on metallic targets with high pulse energies or high repetition rates, which needs to be paid adequate attentions. Herein, we have experimentally investigated the heat diffusion and accumulations during single-shot and multi-shot femtosecond laser ablation on metallic surfaces. We have for the first time observed a novel phenomenon that the thermal effect was intensified abruptly when the laser-pulse number goes over a threshold (approximately between 10 and 20 for aluminum alloy with laser fluence of 6 J cm-2), accompanied with a dramatic reduction of ablated depth and complicated plasma dynamics. Based on both optical and thermodynamic analysis, we introduced a defocusing-dominated plasma-assistant model for this abnormal thermal effect. This work explored the critical experimental parameters for femtosecond-laser surface modification and processing in micro-scale engineering applications.

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Section: Introductionmentioning

confidence: 99%