Abstract

We present an experimental and theoretical investigation of the resonant radiation trapping phenomenon in a magneto-optical trap (MOT) for cesium atoms. We have resonantly excited the 6 2S 1/2( F=4)−6 2P 3/2( F′=5) transition with a probe laser and measured directly its effective radiative lifetime. We compare our experimental data with a model based on an approximate solution of the Holstein equation and with a Monte Carlo simulation of the process. The inadequacy of the standard theory for thermal atomic samples in reproducing the data is pointed out.

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