Extended Data Fig. 5: Effective non-linearity as function of the bandgap.
From: Origin of strong-field-induced low-order harmonic generation in amorphous quartz
Orange dashed line: the sum of Kerr-type and Brunel nonlinearities are considered. Orange solid line: the contribution of the injection is also taken into account. The region shaded in violet shows the effective order of nonlinearity obtained experimentally for an intensity of 12 TW/cm2 when measurement uncertainties are included. The squares correspond to the bandgap values (that is 7.5, 7.7, and 8.0 eV) chosen to illustrate the robustness of our model versus bandgap variations in Fig. 4 of the main manuscript.
