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The coherent superposition of two-atomic levels induced by coherentpopulation trapping is employed in a standard $\Lambda$ type scheme to form atripod-like system. A weak probe pulse scanning across the system is shown toexperience a crossover from absorption to transparent and then toamplification. Consequently the group velocity of the probe pulse can becontrolled to propagate either as a subluminal, a standard, a superluminal oreven a negative speed. It is shown that the propagation behavior of the lightfield is entirely determined and controlled by the initial states of thecoherent superposition.

Coherent control of light field with electromagnetically induced transparency in a dark state Raman coherent tripod system