The ability to domain engineer bulk ferroelectric crystals has translated to engineering nonlinear optical interactions. By periodically inverting the domain structure of a ferroelectric crystal one can optimize for nonlinearity, interaction length, and design wavelength. This capability has led to a wide range of new applications from low-threshold devices to THz generation. The impact of these crystals on the field of nonlinear optics is in its infancy and will continue to have strong impact in the coming years. This talk will cover the underlying nonlinear optics of domain-engineered ferroelectrics, crystal design considerations, comparisons between ferroelectrics, and applications of these crystals to devices.
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