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Pré-Publication, Document De Travail Année : 2009

Threshold of a random laser based on Raman gain in cold atoms

Résumé

We address the problem of achieving a random laser with a cloud of cold atoms, in which gain and scattering are provided by the same atoms. In this system, the elastic scattering cross-section is related to the complex atomic polarizability. As a consequence, the random laser threshold is expressed as a function of this polarizability, which can be fully determined by spectroscopic measurements. We apply this idea to experimentally evaluate the threshold of a random laser based on Raman gain between non-degenerate Zeeman states and find a critical optical thickness on the order of 200, which is within reach of state-of-the-art cold-atom experiments.
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Dates et versions

hal-00370950 , version 1 (25-03-2009)
hal-00370950 , version 2 (23-06-2009)

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William Guerin, Nicolas Mercadier, Davide Brivio, Robin Kaiser. Threshold of a random laser based on Raman gain in cold atoms. 2009. ⟨hal-00370950v1⟩
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