FEMTOSECOND LASER SINGLE PULSE AND PULSE TRAINS ABLATION OF COPPER

The formation of nanostructures induced by femtosecond (fs) laser single pulse and pulse trains on copper (Cu) were systematically investigated. We found that the ablation size increases with the increasing of laser pulse number and laser fluence. A relative long interaction time is benefit for the formation of periodic surface structures when the laser fluence is determined. By using femtosecond laser direct writing on the surface of Cu, we obtained the optimum laser parameters to induce optimal ripple structures by using a pulse train. We found that the pulse train is more effective in controlling ripple’s shape and quality compared with single pulse.