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Applied Physics Letters

Efficient ir image up-conversion in two-photon resonantly pumped Cs vapor

E. A. Stappaerts, Stephen E. Harris, J. F. Young

Published Nov 15, 1976• 21 citations
Publisher

Abstract

Resonant two-photon pumping in the Cs 6s2S-7s2S transition has been used for 2.9 μm to 4550 Å image up-conversion. A power conversion efficiency of 20% with 1000 resolvable spots was achieved using a pump power of 8 kW. The pumping laser, Nd : lanthanum berylate, has a natural two-photon coincidence with the Cs 6s2S-7s2S transition.
DOI
10.1063/1.88895

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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.