Extended Data Fig. 11. Polarization resolved SHG from hBN.

The rotation of SHG as a function of the polarization rotation of a linearly polarized pump pulse is illustrated here. The intensity of the SHG (normalized) is mapped after passing through a polarizer/Wollaston prism for few-odd-layer hBN patch site 1 in subplot a and patch site 2 in subplot b on a fused silica substrate. The fit function used is Y_fit = A cos (−2θ + φ)², where A is the amplitude of the oscillation and θ is the angle of the incoming pump polarization.