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Advanced Photonics

All-optical control of the group velocity, central frequency and spectral bandwidth of a laser pulse

Emilio Ignesti, Roberto Buffa, Lorenzo Fini, E. Sali, Marco V. Tognetti, Stefano Cavalieri

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We present recent results on different schemes (involving both coherent and incoherent interactions) that allow all-optical control of several properties of a large-spectral-bandwidth (up to 3.3 GHz) laser pulse propagating in an atomic medium.
DOI
10.1364/sl.2011.slmb6

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Coherent interactions of laser light with atomic ensembles allow one to modify dispersive properties of a medium and lead to new optical phenomena. Studies of the controlled light propagation and storing in such media have recently become a dynamically developing field of research motivated both by the fundamental character of the processes and by potential applications. This article briefly reviews basic theoretical approach to the dynamics of the propagation of laser pulses in optically modified media. The method and the physical processes are discussed that allow one to slow down the group velocity of laser pulse to zero (stopping of light), to transfer the state of a light pulse to atomic coherences and to restore the pulse. The interpretation of these phenomena in the formalism of dark-state polaritons is presented. Examples of possible coherent manipulations on a stored light are also discussed.