Affiliation:
1. Shanghai University of Engineering Science
2. Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology
3. University of Warwick
4. Fudan University
5. Jiangsu University of Science and Technology
6. SANY Heavy Industry Co. Ltd.
Abstract
In order to demonstrate the formation of laser-induced periodic surface structures (LIPSS), simulations were performed to investigate the effect of multiple femtosecond laser pulses with different laser energy densities on a Ti6Al4V surface. In this work, a set of partial differential equations calculating the electron and lattice temperature variations, followed by coupling with an electric field, is used to analyze the evolution of the periodic surface structure induced by the interaction of the femtosecond laser with the material. As the number of pulses increases, the surface structure of the material changes from none to produce LIPSS structure and from low spatial frequency LIPSS (LSFL) structure to high spatial frequency LIPSS (HSFL) structure. In order to compare the results, single-point laser scanning ablation experiments were carried out at femtosecond laser energy. The experimental results are consistent with the simulation results.
Funder
National Natural Science Foundation of China
Shanghai Sailing Program
China Postdoctoral Science Foundation
Class III Peak Discipline of Shanghai—Materials Science and Engineering
Subject
Atomic and Molecular Physics, and Optics