Phys. Rev. A 77, 045804 (2008) [3 pages]Fast-responding nonlinear phase shifter using a signal-wave gain mediumReceived 30 October 2007; published 22 April 2008 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. Published by the American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.045804
DOI:
10.1103/PhysRevA.77.045804
PACS:
42.65.Dr, 42.50.Gy
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