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Title: Four-channel optically pumped atomic magnetometer for magnetoencephalography

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/Hz1/2, 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. As a result, this module will serve as a building block of an array for magnetic source localization.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Charles Stark Draper Lab., Cambridge, MA (United States)
Publication Date:
Report Number(s):
SAND-2016-5979J
Journal ID: ISSN 1094-4087; OPEXFF; 642490
Grant/Contract Number:
AC04-94AL85000
Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 24; Journal Issue: 14; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
National Institutes of Health (NIH); USDOE
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; coherent optical effects; diffractive optics; polarimetry; Faraday effect; magneto-optic systems; biological sensing and sensors
OSTI Identifier:
1259900
Alternate Identifier(s):
OSTI ID: 1325716