Figure 6
From: Ultrashort pulse laser ablation of dielectrics: Thresholds, mechanisms, role of breakdown
Modeling results on the temporal dynamics of glass excitation and heating.
(a) Temporal evolution of the electron density on the surface of a fused silica sample for two laser fluences. The simulated fluences of 4 and 5 J/cm2 correspond to the average laser fluences, 2 and 2.5 J/cm2 respectively. (b) The electron and lattice temperature dynamics for the same laser fluences as in (a). At 4 J/cm2, the lattice remains relatively cold, below the annealing point. At 5 J/cm2, the lattice is heated above the melting temperature of 2006 K. (c) The spatial profiles of the free-electron density at time moments of 100 fs after the laser pulse maximum. (d) Dynamic change in the laser intensity of the beam entering the sample after its partial reflection from the laser-excited surface layer, (1 − R(t)) × I0(t) where I0(t) and R(t)) are respectively the incident laser intensity (black solid line) and the time-dependent reflection coeffisient. All data are presented for peak laser fluences.
