Figure 6.

Multi-pulse incubation behaviour of copper after a picosecond laser treatment. (a) Squared diameters D² of the ablated areas of copper in dependence on the peak laser fluence F₀ at a different number of pulses per spot N. Solid dots - experimental data points, solid line - fit by Equation (4). (b) Accumulated laser fluence N × F_th(N) versus a number of laser pulses per spot N. Solid dots - experimental data points, solid line - fit by Equation (9). Pulse duration τ = 10 ps, laser wavelength λ = 1064 nm, repetition rate f_p = 100 kHz.