| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Close-Loop Bell–Bloom Magnetometer with Amplitude Modulation |
| HUANG Hai-Chao, DONG Hai-Feng**, HAO Hui-Jie, HU Xu-Yang |
School of Instrumentation Science and Opto-Electronies Engineering, Beihang University, Beijing 100191
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| Cite this article: |
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HUANG Hai-Chao, DONG Hai-Feng, HAO Hui-Jie et al 2015 Chin. Phys. Lett. 32 098503 |
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Abstract A high sensitive optical amplitude modulation magnetometer is investigated and demonstrated experimentally. We build an experimental platform for the atomic magnetometer and configure it as a Bell–Bloom magnetometer with amplitude modulation of 50% duty cycle square waveform. The open-loop input-output model is deduced from the Bloch equation and is verified experimentally. Instead of locking the frequency by using a voltage control oscillator, we realize a closed loop using the coils to generate a feedback field which avoids the stringent requirement of a high resolution frequency meter and markedly expands the dynamic range as well as the bandwidth. We realize an open loop sensitivity of 0.8 pT/Hz1/2 at 20 Hz using a single light beam, which exceeds that of the state-of-the-art Bell–Bloom magnetometers, and the corresponding closed loop sensitivity is 1.2 pT/Hz1/2.
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Received: 20 April 2015
Published: 02 October 2015
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| PACS: |
85.70.Sq
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(Magnetooptical devices)
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78.20.Ls
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(Magneto-optical effects)
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33.57.+c
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(Magneto-optical and electro-optical spectra and effects)
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