Abstract
The linear magnetic birefringence (LMB) in Ce-substituted Y3Fe5O12 crystals grown by the floating zone method and its influence on the characteristics of optical magnetic field sensors were studied. It was found that the measured LMB values of Δn001=-1.2×10-4 and Δn111=-1.7×10-4 in the Ce0.17Y2.83Fe5O12 sample were three times as large as those in YIG. The influence of LMB on the linearity of the magnetic field sensor, which was based on the Faraday effect created by magnetization rotation, was estimated quantitatively from the analytical result obtained by the Jones matrix calculation method. It was found from both calculation and experimental investigations that LMB strongly affects the linearity of the sensor output. It was successfully demonstrated that use of a pair of Ce:YIG crystals was very effective in improving the sensitivity of the sensor output.
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