Abstract

In this work, we report on experimentally discerning Autler–Townes splitting (ATS) from electromagnetically induced transparency (EIT). Our findings are based on a $\Xi $ (ladder) transition $5{{\rm{S}}_{1/2}} \to 5{{\rm{P}}_{3/2}} \to 5{{\rm{D}}_{5/2}}$ of $^{87}{\rm{Rb}} $ atoms under different laser detuning combinations. Based on the ratio of power levels of two individual and counter-propagating lasers through a room temperature Rb vapor cell, we experiment on two different categories of $\Xi $ configuration: types I and II. For type I, $5{{\rm{P}}_{3/2}} \to 5{{\rm{D}}_{5/2}}$ transition is strongly driven, and we observe EIT. Type II ($5{{\rm{S}}_{1/2}} \to 5{{\rm{P}}_{3/2}}$ strongly coupled) exhibits pure ATS. Under two different two-photon detuning conditions, ATS and EIT are studied. While ATS becomes stronger near exact two-photon resonance condition, the EIT weakens. This is supported by the analysis of blue light emanating from $5{{\rm{D}}_{5/2}} \to {\rm{6}}{{\rm{P}}_{3/2}} \to 5{{\rm{S}}_{1/2}}$ decay. The complete opposite behavior of these two phenomena at exact two-photon resonance condition can be used to clearly discern EIT from ATS.

© 2019 Optical Society of America

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