关键词: 飞秒激光;双温模型;金属箔材;数值计算

Abstract:

the temperature field of copper foil with femtosecond laser pulse based on the two temperature model is numerically calculated to analyze the temperature field in metal and its influencing factors.The evolution rules of the electron and lattice temperature with time and depth are studied with a laser pulse width from 100 to 800 fs and a laser pulse energy density from 509.30 to 2 546.48 J/m2.Results show that the electron temperature peaks in 10-13 s while the lattice temperature remains constant with a thermal equilibrium of the two achieved in several picoseconds.A shorter laser pulse width leads to faster electron temperature rise,higher peak temperature and shorter electronic and lattice coupling.And a higher laser energy density results in faster electron temperature rise,higher peak temperature but longer electronic and lattice coupling time.

Key words: femtosecond laser;two-temperature model;metal foil;numerical calculation