Thanks for the reply, blue_leaf. So when calculating the NL source polarization, the complex amplitudes of the two fields create four propagation terms (1,1), (1,2), (2,1), (2,2) and four phase matching conditions, while the effective susceptibility can be taken as the common factor when both...
Hi there,
I'm having a little trouble understanding the "distinguishability" of frequencies in the nonlinear electric susceptibility tensor. As far as I understand, if we have a SHG process with two collinear beams of the same polarization and frequency ω, there is only one susceptibility...