Abstract

We demonstrate how both normal and anomalous dispersion can be realized concurrently for a pair of weak probes in a doubly driven double-ladder configuration with independent and simultaneous control for group velocities of the pair. We have shown both analytically and numerically that, because of electromagnetically induced transparency and a χ(3)-based gain process, a slow-fast light pair can be realized in the same delay element with group indices ±107 accompanied by gain or relatively small absorption (down to 25%). We also identify parameter regions for realization of concurrent slow-slow and fast-fast light pairs with reduced absorptions.

© 2011 Optical Society of America

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