Fiber optic magnetic field sensor head based on BSO crystal

Georgi L. Diankov; Vladimir L. Tassev; Marin Gospodinov

doi:10.1117/12.262963

27 December 1996 Fiber optic magnetic field sensor head based on BSO crystal

Georgi L. Diankov, Vladimir L. Tassev, Marin Gospodinov

Proceedings Volume 3052, Ninth International School on Quantum Electronics: Lasers--Physics and Applications; (1996) https://doi.org/10.1117/12.262963
Event: Ninth International School on Quantum Electronics: Lasers: Physics and Applications, 1996, Varna, Bulgaria

Abstract

Spectral dependencies of Verdet coefficient (V) of undoped Bi₁₂SiO₂₀ (BSO) and doped with Fe and Cr BSO crystals are studied. It is established that Cr and Fe change V in BSO in the spectral range 440-700 nm. It is found that for doped crystals the Faraday rotation angle is not a single-valued function versus the magnetic filed. The magnetic field scanning causes deep hollows in the light power. This effect is strong at high coherent light and is related to the effectively excitation of Zeeman split electron levels. The same effect is observed for undoped BSO crystal, but below 530 nm. Therefore, it is expedient to use undoped BSO crystal and operate in 600-700 nm spectral range, where light sources are suitable for fiber-optic application. A construction of magnetic field sensor head is presented. The achieved accuracy of this element is 10^-5 T, with a variation of the output signal within 2 percent over the temperature range 10-40 degrees C.

Citation Download Citation

Georgi L. Diankov, Vladimir L. Tassev, and Marin Gospodinov "Fiber optic magnetic field sensor head based on BSO crystal", Proc. SPIE 3052, Ninth International School on Quantum Electronics: Lasers--Physics and Applications, (27 December 1996); https://doi.org/10.1117/12.262963

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