Close-Loop Bell–Bloom Magnetometer with Amplitude Modulation
Received Date:
April 19, 2015
Revised Date:
August 23, 2015
Published Date:
August 05, 2015
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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About This Article
Cite this article:
HUANG Hai-Chao, DONG Hai-Feng, HAO Hui-Jie, HU Xu-Yang. Close-Loop Bell–Bloom Magnetometer with Amplitude Modulation[J].
Chin. Phys. Lett. , 2015, 32(9): 098503.
DOI: 10.1088/0256-307X/32/9/098503
HUANG Hai-Chao, DONG Hai-Feng, HAO Hui-Jie, HU Xu-Yang. Close-Loop Bell–Bloom Magnetometer with Amplitude Modulation[J]. Chin. Phys. Lett. , 2015, 32(9): 098503. DOI: 10.1088/0256-307X/32/9/098503