Figure 3:

Shot-by-shot performance and damage. (a) FHG as a function of the number of consecutive pulses sent to the sample for vertically (blue circles) and horizontally (red crosses) polarized pump. Fit curves are exponentials with decay constants N _V = 7 pulses (R ² = 0.98) and N _H = 49 pulses (R ² = 0.96) for vertically and horizontally polarized pump, respectively. The decay is much faster for the design polarization (V) due to the mechanical structure of the metasurface unit cell. (b) The result of the metasurface irradiation by 100 V-polarized pulses. (c) The result of the metasurface irradiation of 100 H-polarized pulses. The white arrows indicate typical multi-shot damage propagating perpendicular to the polarization of the pump [46].