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
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 .
收稿日期: 2015-04-20
出版日期: 2015-10-02
:
85.70.Sq
(Magnetooptical devices)
78.20.Ls
(Magneto-optical effects)
33.57.+c
(Magneto-optical and electro-optical spectra and effects)
[1] Oukhanski N, Stolz R, Zakosarenko V and Meyer H G 2002 Physica C 368 166 The SQUID Handbook (Weinheim: Wiley-VCH)2007 Nat. Phys. 3 227 2010 Appl. Phys. Lett. 97 151110 2002 Phys. Rev. Lett. 89 130801 2002 Science 295 2247 2010 Space Sci. Rev. 152 23 2009 Phys. Rev. Lett. 102 101601 2010 Phys. Rev. Lett. 105 193601 Chinese patent CN104297702A2010 IEEE Trans. Instrum. Meas. 59 372 2012 Opt. Express 20 14201 1961 Phys. Rev. Lett. 6 280 2006 Appl. Phys. Lett. 88 131108 2002 Phys. Rev. A 65 055403 2006 Phys. Rev. A 73 053404 2000 Appl. Phys. Lett. 77 1605 2013 Opt. Express 21 15121 2012 Eur. Phys. J. Appl. Phys. 57 21004 1946 Phys. Rev. 70 460 2013 Phys. Rev. A 88 012508 2009 Chin. Phys. Lett. 26 067805 2009 Phys. Rev. A 80 033420 2012 Chin. Phys. Lett. 29 100701 2004 Appl. Phys. Lett. 85 4804 2012 Chin. Phys. Lett. 29 068501
[1]
.
[2]
.
[3]
.
[4]
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2015, Vol. 32 
