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Annual Meeting Optical Society of America

Six-wave mixing generated violet emission in sodium vapor

Chin-Chi Chu, B. J. Pong, Jin-Eong Fan, Tai-Sone Yih

Published Jan 1, 1991• 0 citations
Publisher

Abstract

Three violet emissions at 401.6 nm, 465.7 nm, and 471.4 nm are generated in sodium vapor under 578.7-nm excitation. It is assumed to be a six-wave mixing process including a Raman-Stokes.
DOI
10.1364/oam.1991.wl23

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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.