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Fast-Responding Nonlinear Phase Shifter Using A Signal-Wave Gain Medium, K. J. Jiang, L. Deng, E. W. Hagley, Marvin G. Payne

Marvin G. Payne

Using a full density matrix formalism we show that for a lifetime broadened four-level scheme with a signal wave gain medium a large nonlinear phase shift can be induced without signal wave slowdown and attenuation. In this system the signal wave acquires a large nonlinear phase shift and travels with superluminal propagation characteristics. This raises the possibility of rapidly responding nonlinear phase shifting and possibly phase gating devices for information science.