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Definition: the phenomenon that the refractive index of a material can be modified with an electric field
German: elektrooptischer Effekt
The electro-optic effect (or electrooptic effect) is the modification of the refractive index of a medium, caused by an electric field. Only non-centrosymmetric materials (mostly crystals) exhibit the linear electro-optic effect, also called the Pockels effect, where the refractive index change is proportional to the electric field strength (see the article on Pockels effect for more details). Materials exhibiting the Pockels effect are called electro-optic materials.
All centrosymmetric media exhibit only the Kerr electro-optic effect, where the refractive index change is proportional to the square of the electric field strength, and is typically much weaker than for the linear effect.
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