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

Slow and fast light propagation inside an optical cavity containing coherent atoms

Haibin Wu, Min Xiao

Published Jan 22, 2009• 0 citations
Publisher

Abstract

By balancing the steep linear and nonlinear dispersions of an intracavity electromagnetically induced transparency medium, the cavity transmission spectra can be significantly modified and controlled. As the cavity input intensity increases, the cavity linewidth changes from far below to above the empty cavity linewidth, corresponding to the photon propagation in the cavity from "subluminal" to "superluminal", respectively. A "white-light cavity" condition has been achieved under certain experimental conditions.

DOI
10.1117/12.816338

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We experimentally demonstrate cavity linewidth control by manipulating dispersion of the intracavity medium. By making use of the dramatic change of Kerr nonlinearity near electromagnetically induced transparency resonance in a three-level atomic system, the cavity transmission linewidth can be greatly modified. As the cavity input intensity increases, the cavity linewidth changes from below to above empty cavity linewidth, corresponding to subluminal and superluminal photon propagation in the cavity, respectively.
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Atomic media inside an optical cavity can significantly alter the spectral response of the cavity. Both theoretical and experimental examinations are made of the cavity transmission with a highly dispersive intracavity multilevel atomic medium. It is found, owing to the reduced absorption and steep dispersion change accompanying electromagnetically induced transparency in such a multi-level atomic medium, that the cavity linewidth can be made much narrower than the empty cavity linewidth. Cavity linewidth narrowing is measured as a function of both the coupling beam power and the atomic density. These experimental results are in good agreement with the theoretical predictions.
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