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Spectroscopic observation of the rotational Doppler effect

S. Barreiro, J. W. R. Tabosa, H. Failache, A. Lezama

quant-pharXiv:quant-ph/0607184

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.

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