Optimal Control of Pulse Amplification without Inversion

摘要

We apply an optimal control technique (OCT) to design a secondary coupling pulsethat can control the amplification of a given primary optical pulse in a dense media of coherently prepared three level type atoms without population inversion. Effects of pulse absorption, amplification, and reshaping by the medium are incorporated in the OCT. We demonstrate numerically that shape invariant as well as shape distofled amplification without population inversion can be achieved by properly designing the shape of the coupling pulse. The maximum amplification obtainable is shown to be dependent on the initial atomic coherence as well as the upper bound of the coupling pulse intensity. The group velocity of the primary pulse can also be controlled by the coupling pulse.