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Conference on Lasers and Electro-Optics

Spatial and Temporal Magnetometry Using Cold Atoms in Dark Optical Tweezers

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

Published Jan 1, 2009• 0 citations
Publisher

Abstract

We use Faraday spectroscopy of atoms confined to crossed hollow beam tweezers to map magnetic fields over several millimeters with 100 micron resolution. The traps permit several hundred measurements in a single loading cycle.
DOI
10.1364/cleo.2009.jthe98

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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.