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Sensors 2016, 16(10), 1691; doi:10.3390/s16101691

A High-Sensitivity Tunable Two-Beam Fiber-Coupled High-Density Magnetometer with Laser Heating

Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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Author to whom correspondence should be addressed.
Academic Editor: Subhas Chandra Mukhopadhyay
Received: 23 June 2016 / Revised: 27 September 2016 / Accepted: 8 October 2016 / Published: 13 October 2016
(This article belongs to the Special Issue Giant Magnetoresistive Sensors)
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Abstract

Atomic magnetometers (AM) are finding many applications in biomagnetism, national security, industry, and science. Fiber-coupled (FC) designs promise to make them compact and flexible for operation. Most FC designs are based on a single-beam configuration or electrical heating. Here, we demonstrate a two-beam FC AM with laser heating that has 5 fT/Hz1/2 sensitivity at low frequency (50 Hz), which is higher than that of other fiber-coupled magnetometers and can be improved to the sub-femtotesla level. This magnetometer is widely tunable from DC to very high frequencies (as high as 100 MHz; the only issue might be the application of a suitable uniform and stable bias field) with a sensitivity under 10 fT/Hz1/2 and can be used for magneto-encephalography (MEG), magneto-cardiography (MCG), underground communication, ultra-low MRI/NMR, NQR detection, and other applications. View Full-Text
Keywords: atomic magnetometers; low-frequency; high sensitivity atomic magnetometers; low-frequency; high sensitivity
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Savukov, I.; Boshier, M.G. A High-Sensitivity Tunable Two-Beam Fiber-Coupled High-Density Magnetometer with Laser Heating. Sensors 2016, 16, 1691.

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