Double resonance at inhomogeneously broadened transitions in common-upper-level scheme during the formation of self-induced transparency pulses in the pump channel

The transient double resonance excited in a common-upper-level scheme is studied theoretically in a medium whose spectral inhomogeneity is caused by the Doppler effect. The formation of the 0π, 2π- and 4π-pulses in the pump channel is considered. Studies of the pulse formation dynamics have revealed, in particular, that the exponential gain of a signal pulse is possible only if the pump channel contains at least one 2π-pulse. If there are more than one 2π-pulses in the pump channel, each pump pulse generates its own signal pulse whose characteristics are determined by the parameters of the pump pulse. (nonlinear optical phenomena)