We present experimental evidence that the intensity correlations of light scattered from a cold-atom cloud are sensitive to the presence of small amounts of radiation trapping in an atomic sample of density 6 × 108/cm3, with an optical depth (for a resonant light beam) of 0.4. This density and optical depth are approximately an order of magnitude less than the density and on-resonance optical depth at which effects of multiple scattering in cold-atom clouds have been previously observed [Phys. Rev. Lett. 64, 408 (1990)].
© 2004 Optical Society of America
Ronald Stites, Matthew Beeler, Laura Feeney, Soo Kim, and Samir Bali, "Sensitive measurement of radiation trapping in cold-atom clouds by intensity correlation detection," Opt. Lett. 29, 2713-2715 (2004)