ガーネット単結晶を用いたリング干渉型光磁界センサ

概要

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A magnetic-field sensor based on reflection-ring interferometry is proposed to achieve a probing scheme with a polarization maintaining fiber (PMF). We used Tb0.19Y0.81Fe5O12 ((TbY)IG) crystals with a striped magnetic domain structure as a Faraday element to enable both parallel and perpendicular fields to the propagating direction of the optical wave to be measured. A linear magnetization curve without hysteresis and a linear Faraday effect were expected to be obtained as the magnetization process of rotation occurred in each striped magnetic domain. This assumption was confirmed in an experiment. Experimental results such as sensitivity and SNR were well explained by this model. The obtained sensor sensitivity was 1.08 × 10-3 %/(A/m), and good linearity of sensor output was obtained over a wide dynamic range between 1 A/m to 104 A/m.