Faster light with competing absorption and gain.

@article{Swaim2018FasterLW,
  title={Faster light with competing absorption and gain.},
  author={Jon D. Swaim and Ryan T. Glasser},
  journal={Optics express},
  year={2018},
  volume={26 8},
  pages={
          10643-10648
        }
}
We experimentally investigate the propagation of optical pulses through a fast-light medium with competing absorption and gain. The combination of strong absorption and optical amplification in a potassium-based four-wave mixing process results in pulse peak advancements up to 88% of the input pulse width, more than 35× that which is achievable without competing absorption. We show that the enhancement occurs even when the total gain of the four-wave mixer is unity, thereby rendering the medium… 

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