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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 12 — Jun. 15, 2012
  • pp: 2247–2249

Optical magnetometer array for fetal magnetocardiography

Robert Wyllie, Matthew Kauer, Ronald T. Wakai, and Thad G. Walker  »View Author Affiliations

Optics Letters, Vol. 37, Issue 12, pp. 2247-2249 (2012)

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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.

© 2012 Optical Society of America

OCIS Codes
(170.4580) Medical optics and biotechnology : Optical diagnostics for medicine
(280.1415) Remote sensing and sensors : Biological sensing and sensors

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: February 22, 2012
Revised Manuscript: March 27, 2012
Manuscript Accepted: March 28, 2012
Published: June 6, 2012

Virtual Issues
Vol. 7, Iss. 8 Virtual Journal for Biomedical Optics

Robert Wyllie, Matthew Kauer, Ronald T. Wakai, and Thad G. Walker, "Optical magnetometer array for fetal magnetocardiography," Opt. Lett. 37, 2247-2249 (2012)

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