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Advanced Photonics

Decay Time in a Cavity in Slow or Fast Light Regime

T. Lauprêtre, Rupamanjari Ghosh, Sylvain Schwartz, Fabienne Goldfarb, Fabien Bretenaker

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We measure the photon lifetime in a cavity containing 4He* creating slow or fast light. This lifetime is shown to depend on the group velocity of light. Ultimate performances of fast light gyros are discussed.
DOI
10.1364/sl.2011.slwa3

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We investigate experimentally the lifetime of the photons in a cavity containing a medium exhibiting strong positive dispersion. This intracavity positive dispersion is provided by a metastable helium gas at room temperature in the electromagnetically induced transparency (EIT) regime, in which light propagates at a group velocity of the order of 10000 m/s. The results definitely prove that the lifetime of the cavity photons is governed by the group velocity of light in the cavity, and not its phase velocity.