Dipartimento di Fisica “Ettore Pancini”, Università di Napoli Federico II, Napoli (Italy)
The interaction of ultrashort laser pulses (~ 100 fs) with solid targets is largely exploited both in fundamental research and scientific and technological applications. In particular, laser ablation induced by ultrashort laser pulses is opening up several interesting opportunities in “material processing”. Among the various examples, the direct generation of nanoparticles and the creation of micro- and nano-structured surfaces represent two cases of striking scientific interest which can also lead to diverse important applications.
This presentation will firstly illustrate the basic mechanisms involved in laser ablation triggered by intense, femtosecond laser pulses and the peculiar characteristics of the decomposition processes of the irradiated material occurring at the early stages after the pulse hits the target. Then, the features of the generated blow off of ablated material will be presented addressing the typical characteristics of femtosecond laser produced plasmas and of the generated nanoparticles, and the possibility to elaborate nanoparticles-assembled films. Finally, the glance will be moved to the surface of the target material discussing the formation of micro- and nano-structured surfaces by “direct femtosecond laser surface processing” with gaussian and optical vortex beams.