Chinese Optics Letters, 2005, 3 (1): 0157, Published Online: Jun. 6, 2006
Femtosecond laser ablation of metals: a molecular dynamics simulation study
020.0020 atomic and molecular physics 140.7090 ultrafast lasers 310.3840 materials and process characterization
Abstract
Using molecular dynamics (MD) methods combining with two-step radiation heating model, the mechanisms of ablation and the thermodynamic states at Ni surface under femtosecond laser irradiation are investigated. Simulation results show that the main mechanisms of ablation are evaporation and tensile stresses generated inside the target. The velocity of stress wave is predicted to be nearly equal to sound velocity. The rates of ablation at different fluences obtained from simulations are in good agreement with experimental data. Superheating phenomenon is also discovered.
Xuan Liu, Yang Wang. Femtosecond laser ablation of metals: a molecular dynamics simulation study[J]. Chinese Optics Letters, 2005, 3(1): 0157.