Figure 3

Frequency spectra of the output field with different values of J as: (a) J = 2π × 8 MHz, (b) J = 2π × 37 MHz, (c) J = 2π × 81 MHz, and (d) J = 2π × 278 MHz. Here the power of the CW control field is P₁ = 37.3 μW, the maximum power of the driving pulse is  mW, and the other parameters are the same as in Fig. 2.