Enhanced frequency up-conversion in Rb vapor

A. Vernier, S. Franke-Arnold, E. Riis, A. S. Arnold

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We demonstrate highly efficient generation of coherent 420 nm light via up-conversion of near-infrared lasers in a hot rubidium vapor cell. By optimizing pump polarizations and frequencies we achieve a single-pass conversion efficiency of 260% per Watt, significantly higher than in previous experiments. A full exploration of the coherent light generation and fluorescence as a function of both pump frequencies reveals that coherent blue light is generated close to Rb-85 two-photon resonances, as predicted by theory, but at high vapor pressure is suppressed in spectral regions that do not support phase matching or exhibit single-photon Kerr refraction. Favorable scaling of our current 1 mW blue beam power with additional pump power is predicted.

Original languageEnglish
Pages (from-to)17020-17026
Number of pages7
JournalOptics Express
Issue number16
Publication statusPublished - 2 Aug 2010


  • electromagnetically induced transparency
  • 2-photon spectroscopy
  • diode-laser
  • rubidium
  • coherent
  • cesium
  • atoms

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