Controllable steep dispersion with gain in a four-level N-scheme with four-wave mixing

Abstract

We present a theoretical analysis of the propagation of light pulses through a medium of four-level atoms, with two strong pump fields and a weak signal field in an N-scheme arrangement. We show that the generation of four-wave mixing has a profound effect on the signal field group velocity and absorption, allowing the signal field propagation to be tuned from superluminal to slow light regimes with amplification.

7 pages, 7 figures

References in corpus (4)

• Light propagation through closed-loop atomic media beyond the multiphoton resonance condition
• Large negative and positive delay of optical pulses in coherently prepared dense Rb vapor with buffer gas
• Light storage in an optically thick atomic ensemble under conditions of electromagnetically induced transparency and four-wave mixing
• Stimulated generation of superluminal light pulses via four-wave mixing

Cited by in corpus (5)

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• Tailorable Dispersion in a Four-Wave Mixing Laser
• Spectral characteristics of a modified inverted-Y system beyond rotating wave approximation