On electromagnetically induced transparency in the degenerate Λ-scheme

Valerii S Zapasskii

Using an experimental work on 'stopped light' as an example, we show how a classical phenomenon of linear optics, the interference of polarized light, can imitate the effect of electromagnetically induced transparency.

Saesun Kim, Alberto M. Marino

Oleg M. Parshkov

We present the results of numerical simulation of the adiabaton emergence process in the lambda scheme of degenerate energy levels with the quantum number of the total angular momentum, J = 0, 2, 1. In the case of linear polarisation of the input highfrequency field and circular polarisation of the input low-frequency field, the energy of the high-frequency component of the adiabaton is shown to focus in two or more pulses: in one of the pulses the field is circularly polarised in a direction opposite to that of the low-frequency input field, whereas in other pulses it is circularly polarised in the same direction as that of the field. This effect is caused by the specific character of electromagnetically induced transparency in the lambda scheme under study and by the trends introduced by self-induced transparency in it.

Ljiljana Stevanović, Nikola Filipović, Vladan Pavlović

Bui Dinh Thuan, W. Leoński, Van Cao Long +1 more

We discuss a Λ-like model of atomic levels involving two autoionizing (AI) states of the same energy. The system is irradiated by two external electromagnetic fields (strong -- driving and weak -- probing ones). For such a system containing degenerate AI levels we derive the analytical formula describing the medium susceptibility. We show that the presence of the second AI level lead to the additional electromagnetically induced transparency (EIT) window appearance. We show that the characteristic of this window can be manipulated by changes of the parameters describing the interactions of AI levels with other ones. This is a new mechanism which leads to additional transparency windows in EIT model, that differs from the mechanism, where a bigger number of Zeeman sublevels is taken into account.

Andrzej Raczyński, M. Rzepecka, Jarosław Zaremba +1 more