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Journal of Optics B Quantum and Semiclassical Optics

Stopping and storing a light pulse in an ultracold atomic medium

Kaige Wang, Fanglin Peng, Guojian Yang

Published Dec 9, 2002• 13 citations
Publisher

Abstract

We perform a full numerical simulation of the electromagnetically induced transparency model in which a signal field can be stored and retrieved by adiabatically changing the control field. The numerical results imitate the detailed transfer process of a signal pulse between light and matter that corresponds with a recent experiment and the theoretical analysis.

DOI
10.1088/1464-4266/5/1/306

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We perform a full numerical simulation of the electromagnetically induced transparency model in which a signal field can be stored and retrieved by adiabatically changing the control field. The numerical results imitate the detailed transfer process of a signal pulse between light and matter that corresponds with a recent experiment and the theoretical analysis.
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.
Theoretical analysis and a full numerical simulation of the electromagnet ically induced transparency model are performed under detuning conditions for a closed three_level ultracold atomic system in which a signal field can be stored and retrieved. Numerical results confirm the theory that the system can be prep ared in dark states only under resonant conditions between the fields and the a tomic transitions. The signal field is partially stored in the ultracold atomic medium with the increase of detuning and an enhanced negative group velocity of t he physically vanishing signal pulse appears. In the case of a symmetrical detun ing (red or blue detuning), no remarkable changes of the storage process occur.
We experimentally study the controllable generation of a beating signal using stored light pulses based on electromagnetically induced transparency (EIT) in a solid medium. The beating signal relies on an asymmetric procedure of light storage and retrieval. After storing the probe pulse into the spin coherence under the EIT condition, two-color control fields with opposite detunings instead of the initial control field are used to scatter the stored spin coherence. The controllable beating signal is generated due to alternative constructive and destructive interferences in the retrieved signal intensities. The beating of the two-color control fields is mapped into the beating of weak probe fields by using atomic spin coherence. This beating signal will be important in precise atomic spectroscopy and fast quantum limited measurements.