Radiation trapping in a dense cold Rydberg gas

  title={Radiation trapping in a dense cold Rydberg gas},
  author={Daniel Paul Sadler and Elizabeth Michelle Bridge and Danielle Boddy and Alistair D. Bounds and Niamh C. Keegan and Graham Lochead and Matthew. P. A Jones and B. Garc{\'i}a Olmos},
Cold atomic gases resonantly excited to Rydberg states can exhibit strong optical nonlinearity at the single photon level. We observe that in such samples radiation trapping leads to an additional mechanism for Rydberg excitation. Conversely we demonstrate that Rydberg excitation provides a novel in situ probe of the spectral, statistical, temporal and spatial properties of the trapped re-scattered light. We also show that absorption can lead to an excitation saturation that mimics the Rydberg… CONTINUE READING