Spectroscopic observation of the rotational Doppler effect

Abstract

We report on the first spectroscopic observation of the rotational Doppler shift associated with light beams carrying orbital angular momentum. The effect is evidenced as the broadening of a Hanle/EIT coherence resonance on Rb vapor when the two incident Laguerre-Gaussian laser beams have opposite topological charges. The observations closely agree with theoretical predictions.

Submited to Physical Review Letter

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• Rotational Doppler Effect in Magnetic Resonance
• The optical manipulation of matter-wave vortices: An analogue of circular dichroism
• Storing vector-vortex states of light in intra-atomic frequency comb
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