We present results obtained by sweeping the frequency of a probe laser beam across a hyperfine absorption line of laser-cooled and trapped atoms in a time of the order of the lifetime of the excited state. The method allows observation of coherent transient phenomena in laser spectroscopy. The results can be understood quantitatively on the basis of an analysis describing interference between the probe laser field and an induced polarization of the resonant sample.
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Pietiläinen et al. (1997) studied this question.
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