Ultraslow pulse propagation in parametric amplifying media

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In a three-level Lambda system, we apply two optical waves (couplingwave and probe wave) satisfying the two-photon resonance condition. We investigate thepulse propagation behaviors such as pulse height, pulse width and pulse delay time underparametric amplification conditions with a strong coupling power. We also investigatethe importance of the sublevel coherence between the two hyperfine levels induced by the two optical waves.