Abstract
We propose a general theoretical scheme to investigate the crossover from electromagnetically induced transparency (EIT) to Autler–Townes splitting (ATS) in open ladder-type atomic and molecular systems with Doppler broadening. We show that when the wavenumber ratio , EIT, ATS, and EIT-ATS crossover exist for both ladder-I and ladder-II systems, where () is the wavenumber of control (probe) field. Furthermore, when is far from , EIT can occur, but ATS is destroyed if the upper state of the ladder-I system is a Rydberg state. In addition, ATS exists but EIT is not possible if the control field used to couple the two lower states of the ladder-II system is a microwave field. The theoretical scheme developed here can be applied to atoms, molecules, and other systems (including molecules, and Rydberg atoms), and the results obtained may have practical applications in optical information processing and transformation.
© 2014 Optical Society of America
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