Nonlinear optics Second harmonic generation 9 Harmonic generation 8 Harmonic analysis 6 Mathematical models 6 Photons 6 Optical fibers 5 Feedback 4 Laser optics 4 Light 4 Light propagation 4 Low-frequency fluctuation (LFF) regime 4 Noise-driven excitable systems 4 Nonlinear susceptibilities 4 Optics and Photonics 4 Quantum theory 4 Semiconductor device models 4 Semiconductor lasers 4 article 4 chemistry 4 optics 4 Óptica nolineal 4 Amplification effects 2 Angular momentum operators 2 Anisotropic materials 2 Anomalous dispersion 2 Band structure 2 Bifurcation (mathematics) 2 Bifurcations and chaos 2 Centrosymmetric media 2