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Opt Express. 2010 Mar 15;18(6):5407-12. doi: 10.1364/OE.18.005407.

All-fiber optical magnetic-field sensor based on Faraday rotation in highly terbium-doped fiber.

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Laboratory for Laser Energetics, University of Rochester, 250 East River Rd, Rochester, NY 14623, USA.


An all-fiber optical magnetic field sensor is demonstrated. It consists of a fiber Faraday rotator and a fiber polarizer. The fiber Faraday rotator uses a 2-cm-long section of 56-wt.%-terbium-doped silicate fiber with a Verdet constant of -24.5 rad/(Tm) at 1053 nm. The fiber polarizer is Corning SP1060 single-polarization fiber. The sensor has a sensitivity of 0.49 rad/T and can measure magnetic fields from 0.02 to 3.2 T.

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