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We have observed the ultraslow propagation of matched pulses in nondegeneratefour-wave mixing in a hot atomic vapor. Probe pulses as short as 70 ns can bedelayed by a tunable time of up to 40 ns with little broadening or distortion.During the propagation, a probe pulse is amplified and generates a conjugatepulse which is faster and separates from the probe pulse before getting lockedto it at a fixed delay. The precise timing of this process allows us todetermine the key coefficients of the susceptibility tensor. The presence ofgain in this system makes this system very interesting in the context ofall-optical information processing.Comment: 5 pages, 4 figure

Ultraslow Propagation of Matched Pulses by Four-Wave Mixing in an Atomic Vapor