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

Nathaniel B. Phillips, Irina Novikova, Eugeniy E. Mikhailov, Dmitry Budker, Simon Rochester
2013 Journal of Modern Optics  
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.
doi:10.1080/09500340.2012.733433 fatcat:l77ibmj6s5cebhs32gdsxkhfzy