Sandwich structure magnetometer with a high sensitivity and signal-to-noise ratio based on an ultrahigh-Q CaF 2 resonator

Whispering gallery mode (WGM) resonators with an ultrahigh quality ( ) 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 cons...

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Bibliographic Details
Published inApplied optics. Optical technology and biomedical optics Vol. 62; no. 3; p. 820
Main Authors Bai, Jiamin, Rong, Jiamin, Xing, Enbo, Ji, Ruipu, Yue, Jun, Li, Li, Liu, Wenyao, Zhou, Yanru, Tang, Jun, Liu, Jun
Format Journal Article
LanguageEnglish
Published United States 20.01.2023
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Summary:Whispering gallery mode (WGM) resonators with an ultrahigh quality ( ) 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 factor of 10 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 at 42 kHz.
ISSN:2155-3165
DOI:10.1364/AO.479580