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Electromagnetically Induced Transparency (EIT) and Autler-Townes (AT) are twophenomena that could be featured by a variety of three-level atomic systems.The considered phenomena, EIT and AT, are similar "looking" in the sense thatthey both are characterized by a reduction in absorption of a weak field in thepresence of a stronger field. In this paper, we explicitly set the threshold ofseparation between EIT and AT in a unified study of four different three-levelatomic systems. Two resonances are studied and compared in each case. Acomparison of the magnitudes of the resonances reveals two coupling fieldregimes and two categories of three-level systems.

EIT and AT: Two Similar but Distinct Phenomena in Two Categories of Three-Level Atomic Systems