Abstract
We report a differential phase sensor capable of measuring Faraday rotation in reflection mode with a single measurement and a small field-depth factor. Based on a polarization-maintaining-fiber low- coherence interferometer, the sensor measures phase difference between two decorrelated and oppositely polarized circular states incident on a sample. Sensitivity of the sensor for the Faraday rotation is , allowing applications on small volumes of liquids. The Verdet constants of various liquids, including clear and turbid samples, are measured at .
© 2009 Optical Society of America
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