Journal
OPTICS EXPRESS
Volume 24, Issue 14, Pages 15403-15416Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.015403
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Funding
- US Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health (NIH) [R01EB013302]
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We have developed a four-channel optically pumped atomic magnetometer for magnetoencephalography (MEG) that incorporates a passive diffractive optical element (DOE). The DOE allows us to achieve a long, 18-mm gradiometer baseline in a compact footprint on the head. Using gradiometry, the sensitivities of the channels are < 5 fT/Hz(1/2), and the 3-dB bandwidths are approximately 90 Hz, which are both sufficient to perform MEG. Additionally, the channels are highly uniform, which offers the possibility of employing standard MEG post-processing techniques. This module will serve as a building block of an array for magnetic source localization. (C) 2016 Optical Society of America
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