2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/166128We present a preliminary experimental study of the dependence on optical depth of slow and stored light pulses in Rb vapor. In particular, we characterize the efficiency of slow and stored light as a function of Rb density; pulse duration, delay and storage time; and control field intensity. Experimental results are in good qualitative agreement with theoretical calculations based on a simplified three-level model at moderate densities.9 pages, 6 figures; small modifications (including title) from published versionQuantum Physicstext