Abstract
In the presence of a longitudinal magnetic field , a beam of linearly polarized light incident from a Faraday medium of Verdet constant refracts at its interface with a medium of negligible Verdet constant and emerges as two opposite circularly polarized beams that are separated by a small divergence angle that is proportional to the product . Judicious postselection of the polarization state of the emergent light can be used to amplify the measured value of by several orders of magnitude. This technique makes it possible to optically measure either very small values when is known or small magnetic fields when is known.
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