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Chinese Journal of Physics

Axially Phase-Matched Six-Wave Mixing Emissions in Alkali Metal Vapors

Wei‐Tzou Luh

Published Apr 1, 1990• 2 citations
OpenAlex

Abstract

Using the standard formulas of parametric wave-mixing theory, axially phase-matched six-wave mixing emissions in some pure alkali metal vapors and binary mixed vapors have been predicted. It is demonstrated that the wave-mixing emission frequencies in a particular metal vapor can be significantly shifted by the presence of another alkali metal element, the one right below (or above) it in the periodic table.

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Using the standard formulas of parametric wave-mixing theory, axially phase-matched six-wave mixing emissions in some pure alkali metal vapors and binary mixed vapors have been predicted. It is demonstrated that the wave-mixing emission frequencies in a particular metal vapor can be significantly shifted by the presence of another alkali metal element, the one right below (or above) it in the periodic table.
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.