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Electromagnetically induced transparency in systems with degenerate autoionizing levels in Λ-configuration

Dinh T. B., Leoński W., Perina J., Long V. C.

Optica Applicata

2013

Vol. 43, nr 3

471--484

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). 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 leads to the additional electromagnetically induced transparency (EIT) window appearance. We show that the characteristics 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.

Electromagnetically Induced Transparency

Kowalski K., Cao Long V., Dinh Xuan K., Głódź M., Nguyen Huy B., Szonert J.

Computational Methods in Science and Technology

2010

Vol. spec. iss. (2)

131-145

In the initial part of the paper, the principles of the electromagnetically induced transparency (EIT) in basic three-level schemes are sketched, and some applications of this phenomenon are described. Next a presentation follows of a five-level EIT model of Bloch equations, which was developed to reconstruct multipeak cascade-EIT spectra registered in a sample of cold 85Rb atoms in MOT. The respective experiment is also described. The achieved good agreement between theory and performed experiment is documented and discussed.