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 -based gain process, a slow-fast light pair can be realized in the same delay element with group indices accompanied by gain or relatively small absorption (down to ). 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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