Electromagnetically-induced transparency, slow light, and negative group velocities in a room temperature vapor of <sup>4</sup>He<sup>∗</sup>

F. Goldfarb; T. Lauprêtre; J. Ruggiero; F. Bretenaker; J. Ghosh; R. Ghosh

doi:10.1016/j.crhy.2009.10.004

Electromagnetically-induced transparency, slow light, and negative group velocities in a room temperature vapor of ⁴He^∗
[Transparence électromagnétiquement induite, lumière lente et vitesses de groupe négatives dans une vapeur de ⁴He^∗ à température ambiante]

F. Goldfarb ¹ ; T. Lauprêtre ¹ ; J. Ruggiero ¹ ; F. Bretenaker ¹ ; J. Ghosh ² ; R. Ghosh ²

¹ Laboratoire Aimé-Cotton, CNRS – Université Paris Sud 11, 91405 Orsay cedex, France
² School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India

Comptes Rendus. Physique, Volume 10 (2009) no. 10, pp. 919-926.

Résumé
Abstract

L'utilisation d'un gaz d'hélium métastable à température ambiante présente un intérêt particulier du fait du rôle des collisions à changement de vitesse. Celles-ci sont nécessaires pour observer des fenêtres EIT très étroites (moins de 10 kHz) dans ce système élargi par effet Doppler et constitué d'états de spins électroniques. Il est bien connu que, bien que le milieu soit alors transparent, la présence de telles résonances est liée à une forte réduction de la vitesse de groupe d'une impulsion sonde. Nous avons observé l'évolution du délai avec l'intensité du laser de pompe et de petits désaccords Raman. Nous avons également montré qu'il était possible d'utiliser des résonances en présence de désaccord optique (profils de Fano) pour observer la transition d'un régime de lumière lente à des vitesses de groupe négatives. Toutes ces mesures sont en bon accord avec un modèle simple utilisant une largeur homogène effective.

⁴He^∗ at room temperature is a particularly interesting system as velocity changing collisions (VCCs) are necessary to observe ultra-narrow (less than 10 kHz) EIT windows for purely electronic spins in the presence of Doppler broadening. Such narrow resonances are known to be linked to a dramatic reduction of the group velocity of a probe pulse, although the medium is transparent. The evolution of the delay is recorded with respect to the coupling beam intensity and to small Raman detunings. We also demonstrate that it is possible to use optically detuned resonances (Fano-like profiles) to see a transition from slow light to negative group velocity. All these measurements are found to be in good agreement with a simple model based on an effective homogeneous linewidth.

Publié le : 2009-12-01

DOI : 10.1016/j.crhy.2009.10.004

Keywords: Metastable helium, EIT, Slow light, Fast light, Fano profiles
Mot clés : Hélium métastable, EIT, Lumière lente, Lumière rapide, Profils de Fano

Affiliations des auteurs :

F. Goldfarb ¹ ; T. Lauprêtre ¹ ; J. Ruggiero ¹ ; F. Bretenaker ¹ ; J. Ghosh ² ; R. Ghosh ²

¹ Laboratoire Aimé-Cotton, CNRS – Université Paris Sud 11, 91405 Orsay cedex, France
² School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India

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     author = {F. Goldfarb and T. Laupr\^etre and J. Ruggiero and F. Bretenaker and J. Ghosh and R. Ghosh},
     title = {Electromagnetically-induced transparency, slow light, and negative group velocities in a room temperature vapor of {\protect\textsuperscript{4}He\protect\textsuperscript{\ensuremath{*}}}},
     journal = {Comptes Rendus. Physique},
     pages = {919--926},
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     year = {2009},
     doi = {10.1016/j.crhy.2009.10.004},
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F. Goldfarb; T. Lauprêtre; J. Ruggiero; F. Bretenaker; J. Ghosh; R. Ghosh. Electromagnetically-induced transparency, slow light, and negative group velocities in a room temperature vapor of ⁴He^∗. Comptes Rendus. Physique, Volume 10 (2009) no. 10, pp. 919-926. doi : 10.1016/j.crhy.2009.10.004. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2009.10.004/

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