Figure 4

Comprehensive illustration of the χ⁽³⁾ (black dots) and intensity threshold I_th (red dots) for the near-infrared to visible spectral range.

The blue solid curve is adopted from ref. 34 and illustrates the absorption spectrum for a sputtered MoSe₂ thin film. The well comparison between the χ⁽³⁾ data with the absorption curve shows their proportionality.