Abstract
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
Full Article | PDF ArticleMore Like This
Anthony P. Colombo, Tony R. Carter, Amir Borna, Yuan-Yu Jau, Cort N. Johnson, Amber L. Dagel, and Peter D. D. Schwindt
Opt. Express 24(14) 15403-15416 (2016)
Ricardo Jiménez-Martínez, W. Clark Griffith, Svenja Knappe, John Kitching, and Mark Prouty
J. Opt. Soc. Am. B 29(12) 3398-3403 (2012)
Joonas Iivanainen, Tony R. Carter, Jonathan E. Dhombridge, Timothy S. Read, Kaleb Campbell, Quinn Abate, David M. Ridley, Amir Borna, and Peter D. D. Schwindt
Opt. Express 32(10) 18334-18351 (2024)