We present experimental evidence for coherent, directional emission from a random gain medium above the threshold for laserlike emission. In particular, we report the first observation (to our knowledge) of a coherent angular backscattering peak above this threshold. A plausible explanation of our findings follows from the assumption that superfluorescent emission occurs in the gain medium above threshold.
© 2000 Optical Society of America
(030.1640) Coherence and statistical optics : Coherence
(140.3460) Lasers and laser optics : Lasers
(290.1350) Scattering : Backscattering
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
Mohamed Shukri and Robert L. Armstrong, "Coherent, Directional, Laserlike Emission from Random Gain Media," Appl. Opt. 39, 4300-4305 (2000)