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