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

Abstract : 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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Contributor : William Guerin <>
Submitted on : Tuesday, June 23, 2009 - 10:15:49 AM
Last modification on : Tuesday, December 8, 2020 - 9:48:00 AM
Long-term archiving on: : Wednesday, September 22, 2010 - 1:12:28 PM


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  • HAL Id : hal-00370950, version 2
  • ARXIV : 0903.5190



William Guerin, Nicolas Mercadier, Davide Brivio, Robin Kaiser. Threshold of a random laser based on Raman gain in cold atoms. Optics Express, Optical Society of America - OSA Publishing, 2009, 17 (14), pp.11236. ⟨hal-00370950v2⟩



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