Four-state N-atom as a simple theoretical model for electromagnetically induced absorption
A. V. Taichenachev, A. M. Tumaikin, V. I. Yudin
Abstract
A simple theoretical model describing the positive sign of subnatural-width absorption resonances in the recent experiment of Akulshin and co-workers (Phys. Rev. A, 57, 2996 (1998)) is proposed. An analytical expression for the linear response to the weak probe field is found in the low-saturation limit with respect to the control field. It is shown that the positive sign of subnatural resonance is caused by the spontaneous transfer of the light-induced coherence from the excited level to the ground one.
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