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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Optimization of slow and stored light in atomic vapor

Irina V. Novikova, Alexey Vyacheslavovich Gorshkov, David F. Phillips, Yanhong Xiao, Mason Klein, Ronald Lee Walsworth

Published Feb 8, 2007• 6 citations
Publisher

Abstract

We present a preliminary experimental study of optimized slow and stored light pulses in Rb vapor cells. We study the effciency of light storage as a function of pulse duration, storage time, retrieval field intensity, etc. We demonstrate a procedure based on time reversal for the optimization of the effciency for storage of light in atomic ensembles suggested in a recent theoretical paper [A.V. Gorshkov et al., e-print archive quant-ph/0604037 (2006)]. Experimental results are in a good qualitative agreement with theoretical calculations based on a simplified three-level model.

DOI
10.1117/12.716400

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We study procedures for the optimization of efficiency of light storage and retrieval based on the dynamic form of electromagnetically induced transparency in hot Rb vapor. We present a detailed analysis of two recently demonstrated optimization protocols: a time-reversal-based iteration procedure, which finds the optimal input signal pulse shape for any given control field, and a procedure based on the calculation of an optimal control field for any given signal pulse shape. We verify that the two procedures are mutually consistent and that they both independently achieve the maximum memory efficiency for any given optical depth. We observe good agreement with theoretical predictions for moderate optical depths (<25)(<25)(<25), while at higher optical depths the experimental efficiency falls below the theoretically predicted values. We identify possible effects responsible for this reduction in memory efficiency.