We present an experiment in which an ultrashort pulse train propagates resonantly through an optically dense vapor of atomic rubidium. The sequence obtained from a Fabry–Perot interferometer comprises nearly 10 regularly time-delayed and mode-locked pulses. We show that a sequence with phase shift between two successive pulses propagates with important temporal distortion, whereas a sequence with experiences few propagation effects, thus leading for the first time to our knowledge to the possibility of phase control of dispersion effects for an ultrashort pulse train.
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