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We obtain gain of the probe field at multiple frequencies in a closedthree-level V-type system using frequency modulated pump field. There is noassociated population inversion among the atomic states of the probetransition. We describe both the steady-state and transient dynamics of thissystem. Under suitable conditions, the system exhibits large gainsimultaneously at series of frequencies far removed from resonance. Moreover,the system can be tailored to exhibit multiple frequency regimes where theprobe experiences anomalous dispersion accompanied by negligiblegain-absorption over a large bandwidth, a desirable feature for obtainingsuperluminal propagation of pulses with negligible distortion.Comment: 10 pages + 8 figures; To appear in Physical Review

Gain without population inversion in V-type systems driven by a frequency-modulated field