Europhys. Lett.
Volume 69, Number 6, March 2005
Page(s) 938 - 944
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 25 February 2005
Europhys. Lett., 69 (6), pp. 938-944 (2005)
DOI: 10.1209/epl/i2004-10450-8

Slow light amplification in a non-inverted gain medium

F. Caruso1, I. Herrera2, S. Bartalini2 and F. S. Cataliotti1, 2, 3

1  Laboratorio di Informazione Quantistica, Scuola Superiore di Catania via S. Paolo 73, I-95123 Catania, Italy
2  European Laboratory for Non-Linear Spectroscopy (LENS) via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy
3  Dipartimento di Fisica, Università di Catania - via S. Sofia 64, I-95124 Catania, Italy

received 18 October 2004; accepted in final form 26 January 2005
published online 25 February 2005

We investigate the propagation of a coherent probe light pulse through a three-level atomic medium (in the $\Lambda$-configuration) in the presence of a pump laser under the conditions for gain without inversion. When the carrier frequency of the probe pulse and the pump laser are in a Raman configuration, we show that it is possible to amplify a slow propagating pulse. We also analyze the regime in which the probe pulse is slightly detuned from resonance where we observe anomalous light propagation.

42.50.Gy - Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption.
42.25.Bs - Wave propagation, transmission and absorption.
82.53.Kp - Coherent spectroscopy of atoms and molecules.

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