Stimulated generation of superluminal light pulses via four-wave mixing.

@article{Glasser2012StimulatedGO,
  title={Stimulated generation of superluminal light pulses via four-wave mixing.},
  author={Ryan T. Glasser and Ulrich Vogl and Paul D. Lett},
  journal={Physical review letters},
  year={2012},
  volume={108 17},
  pages={
          173902
        }
}
We report on the four-wave mixing of superluminal pulses, in which both the injected and generated pulses involved in the process propagate with negative group velocities. Generated pulses with negative group velocities of up to v(g)=-1/880c are demonstrated, corresponding to the generated pulse's peak exiting the 1.7 cm long medium ≈50 ns earlier than if it had propagated at the speed of light in vacuum, c. We also show that in some cases the seeded pulse may propagate with a group velocity… 

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