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Abstract
Whispering gallery mode (WGM) resonators with an ultrahigh quality ($Q$) factor provide an extremely high resolution for high-precision sensing. However, it is difficult to use them directly in magnetic sensors because of the transparency to the magnetic field. In this paper, a sandwich structure consisting of a neodymium iron boron magnet and calcium fluoride resonator with a $Q$ factor of ${{10}^9}$ is proposed. The experimental results show that, compared with the conventional magnetometer, the signal-to-noise ratio of the optical WGM magnetometer reaches 62 dB, with the direct current sensitivity of 42.59 MHz/mT and the AC sensitivity of ${794}\;{\rm pT}\;{{\rm Hz}^{- 1/2}}$ at 42 kHz.
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