We report on experimental observations of coherent backscattering signals from high-gain scattering media in the regime where significant amplification takes place over one transport length. Our samples consist of polymer sheets containing optically pumped dyes as the amplifying medium, with TiO2 nanoparticles providing the scattering. The width of the backscattering cones narrows with increasing amplification, while the enhancement factor remains unchanged.
© 1996 Optical Society of America
Paulo C. de Oliveira, A. E. Perkins, and N. M. Lawandy, "Coherent backscattering from high-gain scattering media," Opt. Lett. 21, 1685-1687 (1996)