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In nonlinear optics, four-wave mixing (FWM) is a typical third-order nonlinear effect widely employed in areas such as all-optical signal processing, wavelength conversion, and the generation of new light sources. When light propagates through a material with Kerr nonlinearity, the nonlinear interaction of multi-frequency optical fields can generate new frequency components, achieving frequency mixing and energy transfer. This case demonstrates an FDTD simulation workflow for four-wave mixing based on a third-order nonlinear material.

In nonlinear optics, the interaction between light and media produces nonlinear polarization. Second-order nonlinear effects are widely used in optical frequency doubling, frequency mixing, and modulation, which play an important role in lasers, frequency conversion and other devices. This example will simulate the generation of second harmonic using second-order nonlinear materials.