Abstract

We investigate the deflection of light by a cold atomic cloud when the light–matter interaction is locally tuned via the Zeeman effect using magnetic field gradients. This “lighthouse” effect is strongest in the single-scattering regime, where deviation of the incident field is largest. For optically dense samples, the deviation is reduced by collective effects, as the increase in linewidth leads to a decrease in magnetic field efficiency.

© 2014 Optical Society of America

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