Fig. 2

(Color online) a, b are the dispersion and absorption of the probe field in terms of its detuning for a large number of coupling photons (\(n_{2} = 50,100,150\)); c, d are the dispersion and absorption of the probe field for a small number of coupling photons (\(n_{2} = 0,1,2,3,4,5\)). They are plotted versus detuning of probe field \(\Delta_{1}\) where other parameters are \(\gamma_{1} = 0.1,\gamma_{2} = 0.1,\gamma_{3} = 0.001,n_{1} = 1,\Delta_{2} = 0,g_{1} = g_{2} = 1\)