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Using spectral hole-burning-based ultraslow group velocity in a dilute solidmedium, we report enhanced photon echo efficiency three orders of magnitudehigher than that in a nonslow light regime. The enhancement is due toexponentially increased absorption of an optical data pulse owing to theenhanced photon-atom interaction in an ultraslow light regime, whereas echoreabsorption is negligibly small due to group-velocity dependent populationdepletion.

Observations of photon echo enhancement in an ultraslow light regime