Phase Matching, explained via Third Harmonic Generation and Self-Phase Modulation!

Link to my free E-book on the Nonlinear Schrodinger Equation: https://github.com/OleKrarup123/NLSE-primer/blob/main/NLSE_primer.pdf Video series explaining symmetries in nonlinear χ parameters: https://www.youtube.com/watch?v=jBY0LCTtkY4&list=PLbRMhDVUMngfBwyonVP8VIsabtnsV3GVv&index=25 Quick explanation of chi2 tensor symmetry: https://www.youtube.com/watch?v=QkFB9s9yCYY