Eur. Phys. J. D (2012) 66: 256
https://doi.org/10.1140/epjd/e2012-30216-0

Regular Article

Stimulated Raman adiabatic passage via bright state in Λ medium of unequal oscillator strengths

¹ Institute for Physical Research, NAS of Armenia, 0203 Ashtarak, Armenia
² Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR CNRS 6303, Université de Bourgogne, 21078 Dijon Cedex, France

^a e-mail: claude.leroy@u-bourgogne.fr

Received: 1 April 2012
Published online: 9 October 2012

Abstract

We consider the population transfer process in a Λ-type atomic medium of unequal oscillator strengths by stimulated Raman adiabatic passage via bright-state (b-STIRAP) taking into account propagation effects. Using both analytic and numerical methods we show that the population transfer efficiency is sensitive to the ratio q_p/q_s of the transition oscillator strengths. We find that the case q_p > q_s is more detrimental for population transfer process as compared to the case where q_p ≤ q_s. For this case it is possible to increase medium dimensions while permitting efficient population transfer. A criterion determining the interaction adiabaticity in the course of propagation process is found. We also show that the mixing parameter characterizing the population transfer propagates superluminally.