Effect of sample temperature on femtosecond laser ablation of copper

Abstract

Abstract In this work, we conducted an experimental study supported by theoretical analysis of single laser ablation of copper to investigate the interaction between laser and material at different sample temperatures, in order to predict the ablation morphology and lattice temperature changes. For investigating the effect of sample temperature on femtosecond laser processing, we conducted experiments and simulated the thermal behavior on femtosecond laser irradiation copper using a two-temperature model. The simulated results showed that both electron peak temperature and the relaxation time required reaching equilibrium increased as initial sample temperature raised. When the sample temperature grew from 300 K to 600 K, the maximum lattice temperature at the copper surface rose by about 6500 K under femtosecond laser irradiation, and the ablation depth increased by 20%. The simulated ablation depths followed the same general trend as the experimental values. This work provides some theoretical basis and technical support for the development of femtosecond laser processing in the field of metal materials.