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Optics Communications

Optical shocks in resonant media: The role of inhomogeneous broadening

Soodeh Haghgoo, Sergey A. Ponomarenko

Published Sep 15, 2012• 4 citations
Publisher
DOI
10.1016/j.optcom.2012.09.004

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In a recent paper [Gorshkov et al., Phys. Rev. Lett. 98, 123601 (2007)] and in the two preceding papers [Gorshkov et al., this issue, Phys. Rev. A 76, 033804 (2006); 76, 033805 (2006)], we used a universal physical picture to optimize and demonstrate equivalence between a wide range of techniques for storage and retrieval of photon wave packets in homogeneously broadened $\ensuremath{\Lambda}$-type atomic media, including the adiabatic reduction of the photon group velocity, pulse-propagation control via off-resonant Raman techniques, and photon-echo-based techniques. In the present paper, we generalize this treatment to include inhomogeneous broadening. In particular, we consider the case of Doppler-broadened atoms and assume that there is a negligible difference between the Doppler shifts of the two optical transitions. In this situation, we show that, at high enough optical depth, all atoms contribute coherently to the storage process as if the medium were homogeneously broadened. We also discuss the effects of inhomogeneous broadening in solid state samples. In this context, we discuss the advantages and limitations of reversing the inhomogeneous broadening during the storage time, as well as suggest a way for achieving high efficiencies with a nonreversible inhomogeneous profile.
The dynamic nature of the interaction between the electromagnetic field of radiation and a resonantly absorbing medium is manifested as Rabi oscillations and can substantially affect both stationary and transient optical processes. This effect was repeatedly demonstrated for nonstationary transient processes in gaseous media with homogeneously broadened absorption lines. A single approach to the coherent control of the transient processes in the media with essentially inhomogeneous broadening of the absorption line is proposed. The results of the study of the Doppler-broadened molecular transition are presented. The prospects for the study of alternative inhomogeneously broadened media (low-pressure atomic gas and the exciton transitions localized in quantum wells (nanosized semiconductor heterostructures)) are reviewed.