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Frontiers in Optics

Magnetometry with High Sampling Rate using Cold Atoms in a Movable Dark Optical Trap

Matthew L. Terraciano, Mark Bashkansky, Fredrik K. Fatemi

Published Jan 1, 2008• 0 citations
Publisher

Abstract

We use Faraday spectroscopy of atoms confined to a crossed hollow beam trap to measure the magnetic field in a 200-micron-diameter spot with kilohertz sampling rate. Magnetic field maps are acquired by dynamic trap scanning.
DOI
10.1364/ls.2008.lwg4

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We demonstrate Faraday spectroscopy with a high duty cycle and sampling rate using atoms confined to a blue-detuned optical trap. Our trap consists of a crossed pair of high-charge-number hollow laser beams, which forms a dark, boxlike potential. We have used this to measure transient magnetic fields in a $500\text{\ensuremath{-}}\ensuremath{\mu}\text{m}$-diameter spot over a 400 ms time window with nearly unit duty cycle at a 500-Hz sampling rate. We use these measurements to quantify and compensate time-varying magnetic fields to $\ensuremath{\approx}10\text{ }$ nT per time sample.