1. Ablation enhancement of metal in ultrashort double-pulse experiments
- Author
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Jiabo Zhang, Yongfeng Lu, Lan Jiang, Xin Li, Bo Li, Yan Liu, and Kaihu Zhang
- Subjects
010302 applied physics ,Materials science ,Laser ablation ,Physics and Astronomy (miscellaneous) ,Drop (liquid) ,medicine.medical_treatment ,Physics::Medical Physics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,Ablation ,01 natural sciences ,Pulse shaping ,law.invention ,Thermal conductivity ,Physics::Plasma Physics ,law ,0103 physical sciences ,medicine ,Electron temperature ,Irradiation ,Atomic physics ,0210 nano-technology - Abstract
We report an ablation enhancement (both deepening and widening in ablation profiles) on nickel by ultrashort double-pulse laser irradiation, an exception of the typical reduction trend observed in ablation rates for metals irradiated with double-pulse excitations. Maximized at a pulse-separation (τs) of approximately 4 ps, the enhancement was observed before τs was increased to approximately the electron-lattice energy relaxation time. An achievement of ablation, by temporal shaping a weak pulse with energy well below the single-pulse ablation threshold into two considerably weaker pulses, was demonstrated. It is proposed that the enhanced electron-phonon coupling and drop of electronic heat conductivity, both of which result from the reductions in electron temperature (by pulse shaping), co-contribute to the widening in ablation profiles, while the former one is responsible for the deepening. This letter proposed an ablation enhancement approach to ultrashort laser processing of nickel.
- Published
- 2018