Autler–Townes quadruplet spectroscopy

Abstract

We suggest an atomic scheme of Autler–Townes quadruplet spectroscopy by extending the concepts of Autler–Townes doublet and triplet spectroscopy. The present scheme is analyzed in detail with the help of a state vector approach to calculate its emission spectrum. By applying rotating wave and Weisskopf–Wigner approximations to our proposed scheme, we have successfully attained a simple analytical expression of the spectrum interpreting the basic mechanism involved in the process of quantum interference. All the spectroscopic parameters, like the locations of dark lines and the locations and widths of all the peaks, are presented in analytical form. These analyses provide a better understanding of the phenomenon of the Autler–Townes quadruplet spectrum.