Phys. Rev. A 61, 011802(R) (1999) [4 pages]Electromagnetically induced absorption in a four-state system
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. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.61.011802
DOI:
10.1103/PhysRevA.61.011802
PACS:
42.50.Gy
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