Beat frequency dependence of the sensitivity for Faraday-rotation based heterodyning fiber laser magnetic field sensor

Nengpeng Hu; Linghao Cheng; Li Yu; Yizhi Liang; Hao Liang; Bai-Ou Guan

doi:10.1117/12.2184222

1 July 2015 Beat frequency dependence of the sensitivity for Faraday-rotation based heterodyning fiber laser magnetic field sensor

Nengpeng Hu, Linghao Cheng, Li Yu, Yizhi Liang, Hao Liang, Bai-Ou Guan

Author Affiliations +

Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 96552X (2015) https://doi.org/10.1117/12.2184222
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of

Abstract

The beat frequency dependence of the sensitivity for a Faraday-rotation based heterodyning fiber laser magnetic field sensor is studied, which shows that lower beat frequency results in higher sensitivity. By lowering the beat frequency to 2 MHz, the maximum sensitivity of about 43 Hz/μT to magnetic field has been achieved for a heterodyning fiber laser inscribed on an Erbium doped fiber. It also shows that the beat frequency is dependent on the polarization of the 980 nm pump. Therefore, dynamical tuning of the sensitivity optically has also been demonstrated by tuning the polarization of the 980 nm pump.

Citation Download Citation

Nengpeng Hu, Linghao Cheng, Li Yu, Yizhi Liang, Hao Liang, and Bai-Ou Guan "Beat frequency dependence of the sensitivity for Faraday-rotation based heterodyning fiber laser magnetic field sensor", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96552X (1 July 2015); https://doi.org/10.1117/12.2184222

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