Thermomechanical response of copper films irradiated by femtosecond-pulsed lasers with dynamic optical properties

By taking into account the dynamic thermophysical and optical properties, the ultrafast thermoelastic response of thin copper film irradiated by femtosecond lasers has been researched. The temperature and stress fields of copper film irradiated by femtosecond lasers are analyzed in this work. The simulation results reveal that the degree of thermomechanical response is much underestimated, especially with higher laser fluence and smaller pulse duration. It is necessary to employ dynamic properties in ultrafast thermoelastic simulation for accuracy.