The Verdet constant is the coefficient relating Faraday rotation to the magnetic flux density path integral. Its SI units are . It depends on material, wavelength and temperature; a sign requires the stated viewing convention.[ref]
Faraday effect. RP Photonics Encyclopedia, Faraday Effect, Rüdiger Paschotta: What is the Faraday Effect? and Verdet Constants of Materials
The name commemorates Émile Verdet. For nonuniform material or temperature, use when the local scalar description remains valid. A single central magnetic field reading cannot generally replace this weighted integral. Strong additional linear birefringence or appreciable circular dichroism requires following the full polarization of an electromagnetic wave, rather than treating the output as merely a rotated line.
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The Verdet constant is a measure of the strength of the optical rotation of a material in response to an applied magnetic field. Specifically, it quantifies the angle of rotation of the polarization plane of light as it passes through a material in the presence of a magnetic field. This phenomenon is known as the Faraday effect, which is observed in certain materials, especially in glasses and crystals that possess a non-reciprocal optical response due to their magneto-optical properties.