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Chinese Optics Letters

Reversible storage of multiple light pulses in the EIT atomic medium

祝曙光, 徐安士, 张瑜, 郭弘, 陈徐宗, 吴德明

Published Jan 1, 2003• 0 citations
OpenAlex

Abstract

In this paper, we first present a full numerical simulation for the trapping and retrieval procedure of eight continuing 1 Guassian pulses (i.e., 11111111) in the electromagnetically induced transparency (EIT)medium. This simulation shows that an EIT medium has the ability to store multiple light pulses in a shape-preserving way. And we also, for the first time, give the formula evaluating the maximum number of pulses that can be stored by an EIT medium at one time. This work reveals a new possible way to the reversible storage of the photonic information.

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In this paper, we first present a full numerical simulation for the trapping and retrieval procedure of eight continuing 1 Guassian pulses (i.e., 11111111) in the electromagnetically induced transparency (EIT)medium. This simulation shows that an EIT medium has the ability to store multiple light pulses in a shape-preserving way. And we also, for the first time, give the formula evaluating the maximum number of pulses that can be stored by an EIT medium at one time. This work reveals a new possible way to the reversible storage of the photonic information.
We investigate the retrieval efficiency of light slowed and/or stored in a medium with electromagnetically-induced transparency (an EIT medium) by numerical simulations based on first principles. Starting from the master equation formulation, we derive the full dynamics of the system and then show how the approximations are applied to reduce the number of dynamical equations. While operating the system as an optical “retarder,” a “reflector,” and a “beam-splitter,” we find that the total retrieval efficiency in the case of the “beam-splitter” operation is lower than that in either of the other two operations. Nevertheless, we find that (1) when an appropriate value of detuning is applied between the two counter-propagating “ read ”-fields, the retrieval efficiency in the latter case can be significantly improved, (2) storing the signal in the form of the atomic spin wave is more advantageous than storing it in the form of a stationary light pulse (SLP), and (3) the retrieval efficiency can be augmented by increasing the strengths of the “ read ”-fields.
We report on a detailed theoretical investigation of optical information storage in an atomic ensemble modeled by a four-level N-type system, in a nonlinear regime of interaction, where one of the writing fields is large enough to saturate the optical transition. We study the optical pulse generated from a medium in condition of electromagnetically induced absorption (EIA) or electromagnetically induced transparency (EIT). We show that in the EIA condition the energy and the maximum intensity of the pulse extracted are much larger than in the EIT condition. When the information is stored in the EIA condition the full width at half maximum (FWHM) of the optical pulse generated is larger than when extracted in the EIT condition. The energy and maximum intensity of the optical pulse generated are found to have the same decay time whether the information was stored in EIA or EIT conditions. Our work demonstrates a higher efficiency in extracting energy in the saturated regime from an atomic memory based on EIA than from one in EIT condition.
We study the modification of a traditional electromagnetically induced transparency (EIT) stored-light technique that includes both EIT and four-wave mixing (FWM) in an ensemble of hot Rb atoms. The standard treatment of light storage involves the coherent and reversible mapping of one photonic mode onto a collective spin coherence. It has been shown that unwanted, competing processes such as four-wave mixing are enhanced by EIT and can significantly modify the signal optical pulse propagation. We present theoretical and experimental evidence to indicate that, while a Stokes field is indeed detected upon retrieval of the signal field, any information originally encoded in a seeded Stokes field is not independently preserved during the storage process. We present a simple model that describes the propagation dynamics of the fields and the impact of FWM on the spin wave.
Electromagnetically induced transparency and light storing are discussed in the case of an atomic medium in a double $\ensuremath{\Lambda}$ configuration. A polariton description of both phenomena is systematically introduced. Analytic expressions are given which allow one to predict the shapes and phases of both the transmitted pulses and the stored and released ones as well as the atomic coherence in the storage stage. A comparison of the numerical solutions of the Maxwell-Bloch equations with the results due to the polariton model proves a strong predictive power of the latter.
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.