Nonlinear optics
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Nonlinear optics is a branch of optics that studies the case when optical properties of matter depend on the intensity of the input light. Nonlinear phenomena become relevant only when the input light
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Polarization density
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In classical electromagnetism, polarization density is the vector field that expresses the volumetric density of permanent or induced electric dipole moments in a dielectric material. When a dielectri
Nonlinear optics
…the electromagnetic field of light larger than 108 V/m (and thus comparable to the atomic electric field of ~1011 V/m) is required. In this case, the polarization density P responds non-linearly to the electric field E of light. In order to obtain an electromagnetic field that is sufficiently intense, laser sources must…
Above: an elementary volume dV = dV1+ dV2 (bounded by the element of area dA) so small, that the dipole enclosed by it can be thought as that produce by two elementary opposite charges. Below, a planar view (click in the image to enlarge).