Parametric Frequency Conversion of Resonance Radiation in Optically Pumped Rubidium-87 Vapor

Parametric frequency conversion of resonance radiation in an optically pumped atomic vapor has been observed for the first time. Conversion efficiencies of ${10}^{-3\mathrm{}}$ have already been observed in ${\mathrm{Rb}}^{87}$ vapor, and considerably higher conversion efficiencies should be attainable.