= Intrinsic hyperpolarizability
{wiki=Intrinsic_hyperpolarizability}
Intrinsic hyperpolarizability refers to a property of nonlinear optical materials, specifically in the context of their response to external electric fields. It quantifies how the polarization of a material changes in response to the electric field beyond the linear approximation. While the linear response of a medium to an electric field can be described by its linear polarizability, hyperpolarizability is the next level in the series expansion of the polarization with respect to the electric field.
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