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Frontiers in Optics

Theory of Intense-Broadband-Pulse Storage and Retrieval

Rodrigo Gutiérrez–Cuevas, Joseph H. Eberly

Published Jan 1, 2016• 0 citations
Publisher

Abstract

We study the storage and retrieval of intense-broadband pulses in hot atomic gases through analytical and numerical solutions. We show how the spin-wave can be manipulated and the storage of multiple pulses can be accommodated.
DOI
10.1364/fio.2016.ff5c.7

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We analyze the storage and retrieval of intense-broadband pulses with the added effects of Doppler broadening and detuning in a ΛΛΛ configuration. We compute analytical solutions via the inverse scattering technique and show how the signal field is transferred to a spin-wave in the atomic medium and later retrieved by the interaction of a control pulse. Due to the intensity of the pulses, the pulse area (as defined for self-induced transparency) plays a key role in the interaction, as it determines the location of the spin wave within the medium. Additionally, we compare our results to non-ideal conditions by considering pulses of finite length and the effect of spontaneous emission.
We consider storage and retrieval of light based on electromagnetically induced transparency in an atomic medium using nonadiabatic switching of a control field. We derive various conditions for writing (and reading) the light information to (and from) the atomic coherence. We obtain an analytical solution for the retrieval of the stored pulse that is in excellent agreement with the full numerical results. We identify the origin of distortion at the output and derive a condition to correct the distortions by manipulating the retrieval process.
We investigate whether it is possible to store and retrieve an intense probe pulse using a medium that can be modeled as a set of atoms with the relevant energy levels in $\ensuremath{\Lambda}$ configuration. We demonstrate that it is indeed possible to store and retrieve the probe pulses that are not necessarily weak. We find that the retrieved pulse remains a replica of the original pulse, although there is overall broadening and loss of the intensity. The loss of intensity can be understood in terms of the dependence of absorption on the intensity of the probe. Our calculations include the dynamics of the control field, which becomes especially important as the intensity of the probe pulse increases. We use the adiabatic theory of Grobe et al. [Phys. Rev. Lett. 73,73,73, 3183 (1994)] to understand our numerical results on the storage and retrieval of light pulses at moderate powers.