Ultrashort pulse laser ablation of dielectrics


In this research, clear connections have been established between the thresholds and mechanisms of the damage and white-light generation upon femtosecond laser irradiation of wide-bandgap transparent materials such as Corning Willow glass. The experimental results demonstrate co-existence of several ablation mechanisms which can be separated in time. To gain insight into the processes triggered by laser radiation in glass, sophisticated numerical simulations have been performed.

(a) The crater volume as a function of laser fluence for irradiation with one (triangles) and five (squares) pulses. (b) Craters produced by 5 laser pulses at the regimes below (left) and above (right) the breakdown threshold. (c) Schematic illustration of accumulation effects leading to cleaner crater morphology with number of pulses at high laser fluences.