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Observation of Electromagnetically Induced Transparency by a Train of Short Pulses

We report the experimental demonstration of electromagnetically induced transparency in hot rubidium (85Rb) atomic vapour by using an actively mode-locked external cavity diode laser in Littman–Metcalf configuration. We can make opaque resonant transitions transparent to any two optical comb components in the pulse trains which excite atomic coherence in the ground states of 85Rb.