Eur. Phys. J. D 26, 301-306 (2003)
https://doi.org/10.1140/epjd/e2003-00264-8

Spectra of a weakly driven two-level atom in an off-resonant squeezed vacuum

¹ Department of Mathematics, College of Science, University of Bahrain, P.O. Box 32038, Bahrain
² Department of Physics, University of Arkansas, Fayetteville AR 72701, USA
³ Department of Mathematics, Faculty of Science, Ain Shams University, Cairo, Egypt

Corresponding authors: ^a shoukryhassan@hotmail.com - ^b ajoshi@uark.edu

Received: 14 January 2003
Revised: 9 May 2003
Published online: 26 August 2003

Abstract

We have derived analytical expressions for the absorption-dispersion spectra as well as the steady state fluorescence spectrum of a weakly excited single 2-level atom in a broadband squeezed vacuum. The atomic transition frequency and the central frequency of both the squeezed vacuum field and the driving field are assumed different. The absorption-dispersion and resonance fluorescence spectra are found to be very much dependent on the atomic as well as squeezed vacuum detuning and can lead to the situation of negative group velocities. Also, the resonance fluorescence spectrum is sensitive to the relative phase of squeezed vacuum and the driving field in the presence of finite detuning of the squeezed vacuum field.