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By extending the laser-frequency-switching technique to a 100-psec time scale, we have observed for the Na D₁ line the first-order free-induction decay, its inhomogeneous dephasing time T₂*, its interference with the nonlinear free-induction decay, and a 1.8-GHz interference beat of the ground-state hfs. Detailed theoretical predictions of these new coherence effects are faithfully observed.
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DeVoe et al. (1978) studied this question.
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