Six-Wave Mixing Near-Infrared Emissions in Rubidium Vapor

Yao-Ju Chan；Wei-Tzou Luh

Chinese Journal of Physics

33卷3期（1995 / 06 / 01）

247 - 261

英文

During two-photon excitation studies of rubidium vapor, in addition to Rb near-infrared atomic transitions, we have observed several stimulated near-infrared emissions. For the 5S-5D two-photon allowed excitation we observed emissions near 1.325, 1.369, 1.373, 1.477, 1.533 and 1.537 pm, and for the Rb 5S-7s two-photon allowed excitation we observed emissions near 1.330, 1.395, 1.432, 1.484, 1.564 and 1.613 pm. The eight emissions, near 1.325, 1.330, 1.369, 1.395, 1.477, 1.484, 1.533 and 1.564 pm are interpreted as axially phase-matched six-wave mixing emissions, while the other four emissions, near 1.373, 1.432, 1.537 and 1.613 pm, are interpreted as angle phasematched six-wave mixing emissions. Temperature (or number density)-dependent evclution curves of some of the above six-wave mixing emissions have also been measured. The results reveal that different mixing processes occur at different rubidium number densities.