Enhanced frequency up-conversion in Rb vapor.
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 (85)Rb 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.
Vernier
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A
SUPA, Dept of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK.
Franke-Arnold
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S
Riis
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E
Arnold
A S
AS
D004867:Equipment Design; D005740:Gases / Q000737:chemistry*; D007834:Lasers; D017785:Photons; D012413:Rubidium / Q000737:chemistry*; D013057:Spectrum Analysis / Q000295:instrumentation*
D005740:Gases; D012413:Rubidium