An atomic transition that has been made transparent by applying an additional electromagnetic field exhibits a rapidly varying refractive index with zero group velocity dispersion at line center. A 10-cm-long Pb vapor cell at an atom density of 7×{}10¹⁵ atoms/cm³ and probed on its 283-nm resonance transition has a calculated optical delay of 83 ns [(c/VG)=250].
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Harris et al. (1992) studied this question.
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