Enhancement of electromagnetically induced transparency in room temperature alkali metal vapor |
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Authors: | O S Mishina M Scherman P Lombardi J Ortalo D Felinto A S Sheremet D V Kupriyanov J Laurat E Giacobino |
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Institution: | 1.Laboratoire Kastler Brossel, école Normale Supérieure et CNRS,Université Pierre et Marie Curie-Paris 6,Paris,France;2.European Laboratory for Non-Linear Spectroscopy,University of Florence Sesto-Fiorentino,Firenze,Italia;3.Departamento de Fisica,Universidade Federal de Pernambuco, Cidade Universitria,Recife, PE,Brazil;4.Department of Theoretical Physics,State Polytechnic University,St. Petersburg,Russia |
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Abstract: | Electromagnetically induced transparency (EIT) has led to several quantum optics effects such as lasing without inversion
or squeezed light generation. More recently quantum memories based on EIT have been experimentally implemented in different
systems such as alkali metal atoms. In this system the excited state of the optical transition splits into several sublevels
due to the hyperfine interaction. However, most of the theoretical models used to describe the experimental results are based
on a Λ-system with only one excited state. In this article, we present a theoretical model for the Λ-type interaction of two
light, fields and an atomic system with multiple excited state. In particular we show that if the control and probe fields
are orthogonally circularly polarized the EIT effect in an alkali-metal vapor can almost disappears. We also identify the
reasons of this reduction and propose a method to recover the transparency via velocity selective optical pumping. |
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