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Fiber-optic polarimetric DC magnetometer utilizing a composite metallic glass resonator

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1 Author(s)
Mermelstein, M. ; Geo-Centers, Inc., Newton Center, MA, USA

A fiber-optic polarimetric dc magnetometer has been constructed from 50 m of high birefringence optical fiber. Magnetic fields are detected by the magnetostrictive response of a composite thin-shell resonator consisting of an acrylic tube, unannealed metallic glass ribbon, and a 20-m coil of high birefringence fiber. Quadrature is maintained with the phase tracking technique and optical common-mode rejection is utilized for noise reduction. The rms magnetometer noise corresponds to a minimum detectable magnetic field of 2.6 γ in the dc to 1-Hz bandwidth.

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Lightwave Technology, Journal of  (Volume:4 ,  Issue: 9 )