Fig. 4.

Experimental and theoretical nonlinear optical processes in MoS₂. a SHG and THG intensities as functions of N. b Power dependence of SHG and THG in 1L-MoS₂. c Experimental and theoretical THG/SHG irradiance ratio as a function of P _pump. Different theoretical curves refer to different values of the ultra-violet cutoff k _c (in units of $1\mathrm{∕}{a}_0=\sqrt{3}\mathrm{∕}a,$ where a = 3.16 Å is the lattice constant of 1L-MoS₂ ¹²). Black dashed lines in panels a and b are a guide to the eye. The error bars in c account for experimental uncertainties