Simultaneous coupling of three hfs components in a cascade scheme of EIT in cold 85Rb atoms

Electromagnetically induced transparency and Autler-Townes effect in a generalized L-system: A five-level model

“…In this phenomenon widely discussed in numerous studies (see, e.g., [1][2][3][4][5][6] and references cited therein), the optical properties of a medium are modified by a strong light-field coupling in such a way that the absorption of a weak incident probe light is suppressed, or the medium becomes even completely transparent to the probe light.…”

“…Three levels and two light fields causing transitions among the levels can build up three basic configurations of Λ-, V-, and cascade-(or ladder-) types. However, as Abi-Salloum points out [7], the EIT-type suppression of absorption in the cascade scheme occurs only with coupling applied in the second (upper) step and, therefore, with probing in the first (lower) step (such is a scheme used e.g., in the work [5]). At the same time, the EIT does not occur at all in the V-scheme.…”

“…For example, in the work [5] we have studied multiple transparency windows in view of their potential applications in slowing down light pulses at various closely lying frequencies. In order to describe the ladder scheme 5S 1/2 (F = 3) → 5P 3/2 (F′ = 3) ↔ 5P 3/2 (F′′ = 4, 3, 2), which has been applied in experiments with cold 85 Rb atoms in a magneto-optical trap (MOT), a model of (at least) five hyperfine-structure (hfs) levels has been necessary.…”

“…1 and in the frame of our model (This state is not dipole-coupled and, regarding to mutual distances among the hfs states of the 5P 3/2 manifold, it is the most isolated from all the other states). As a result, the number of the levels considered in this work is five, similarly to the study [5], though our scheme is different. In the title, we term this scheme of levels and transitions with multiple upper states simultaneously coupled, as a 'generalized Λ-system', to make a distinction from the actual Λ-type case related to the three-level scheme.…”

EIT Four-Level Lambda Scheme of Cold Rubidium Atoms

“…The probe and coupling beams were approximately at 60° and with orthogonal polarizations. In our previous papers [30,31], we have calculated theoretically the EIT spectra using the master equation introduced in [10] for a five-level model approximation. Our theoretical results are in good agreement with the experimental data obtained by Warsaw Group.…”