Journal
OPTICS LETTERS
Volume 37, Issue 12, Pages 2247-2249Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.37.002247
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- National Institutes of Health Eunice Kennedy Shriver National Institute of Child Health & Human Development [R01HD057965]
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We describe an array of spin-exchange-relaxation-free optical magnetometers designed for detection of fetal magnetocardiography (fMCG). The individual magnetometers are configured with a small volume with intense optical pumping, surrounded by a large pump-free region. Spin-polarized atoms that diffuse out of the optical pumping region precess in the ambient magnetic field and are detected by a probe laser. Four such magnetometers, at the corners of a 7 cm square, are configured for gradiometry by feeding back the output of one magnetometer to a field coil to null uniform magnetic field noise at frequencies up to 200 Hz. We present the first measurements of fMCG signals using an atomic magnetometer. (C) 2012 Optical Society of America
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