Fig. 1. Schematic of M-type five-level atomic system

Fig. 2. Linear dispersion relationship among four components of probe beam. (a) Absorption curves; (b) dispersion curves

Fig. 3. fl(s)(l=1,2,3,4) versus distance s under different initial conditions. (a) α1=-1.24, α2=9, α3=11.2, α4=16.5, γ=0.6468, f1(0)=1.5, f2(0)=3, f3(0)=2.5, f4(0)=0; (b) α1=-7.2, α2=36, α3=56, α4=107, γ=0.7134, f1(0)=4.5, f2(0)=6, f3(0)=8, f4(0)=0

Fig. 4. Four-component intensity of probe field versus propagation time τ/τ0 and propagation distance z/LNL. (a)-(d) Δβ=200, no energy exchange among four components; (e)-(h) Δβ=20, apparent energy exchange among four components