Eur. Phys. J. D 65, 571-579 (2011)
https://doi.org/10.1140/epjd/e2011-20494-3

Regular Article

Controlling the probe-absorption and -dispersion via quantum interference from incoherent pumping field in a four-level lambda-type system

¹ Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran
² Department of Optic and Laser, University of Bonab, Bonab, Iran

^a e-mail: sahrai@tabrizu.ac.ir

Received: 23 August 2011
Received in final form: 19 October 2011
Published online: 1 December 2011

Abstract

Absorptive and dispersive properties of a four-level Λ-type atomic system with two fold lower levels are investigated. The effect of quantum interference induced by incoherent pump and spontaneous emission upon the absorption, dispersion, and group index is them discussed. In addition, the rate of an incoherent pump field and the intensity of coupling field on light propagation is also presented.