Spatially multimode Raman scattering: Optical memory and new, direct method for measuring diffusion

Here we present results of measuring spatially multimode collective Raman scattering in warm Rubidium vapors. It is the first to our knowledge generation, storing and retrieval of spatially multimode light in such process. We also suggest a new, direct method of measuring diffusion coefficients by measuring decoherence of collective excitations in the dark.