Abstract
Nonlinear optics refers to any light-induced change in the optical properties of a material. The most commonly used nonlinear optical effects are of second order: frequency doubling and linear electro-optics. For these second-order nonlinear optical effects, which also include optical sum and difference frequency generation, optical parametric amplification, and in most cases also photorefractive effects, noncentrosymmetry is required. Otherwise they are absent.
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