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Encyclopedia of Laser Physics and Technology

Electro-optic Effect

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Definition: the phenomenon that the refractive index of a material can be modified with an electric field

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.

The linear electro-optic effect is exploited in Pockels cells, which can be part of electro-optic modulators, and for electro-optic sampling.

See also: Pockels cells, electro-optic modulators, electro-optic sampling

Categories: nonlinear optics, physical foundations


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Since October 2008, the Encyclopedia of Laser Physics and Technology is also available in the form of a two-volume book. Maybe you would enjoy reading it also in that form! The print version has a carefully designed layout and can be considered a must-have for any institute library, laser research group, or laser company.

You may order the print version via Wiley-VCH.

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