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Storage and retrieval of light pulses in 'slow' and 'fast' light

A. M. Akulshin, A. Lezama, Andrei I. Sidorov, McLean, R., Peter Hannaford

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

We have experimentally demonstrated that the storage of light can occur in a coherent atomic medium with an associated negative group velocity. Retrieved optical pulses can only have exponentially decaying slope.

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Storage of light pulses in Rb vapour with bright Zeeman coherences and the associated enhanced absorption and steep negative dispersion is reported. Our experimental observations are qualitatively similar to the well-known proof-of-principle demonstration of light storage (D F Phillips et al 2001 Phys. Rev. Lett. 86 783), but obtained under conditions where electromagnetically induced transparency (EIT) does not exist and the slow-light dark-state polariton model does not apply. Under the present experimental conditions the retrieved pulses obtained in atomic media with dark or bright Zeeman coherences have very similar exponentially decaying slopes which are independent of the shape of the incoming signal pulse. Numerical modelling based on the optical Bloch equations reproduces the essential features of the experimental observations.