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Acta Optica Sinica

The stimulated radiations based on FWMF by dipole forbidden two-photon resonance and hybrid excitation-energy transfer in potassium vapor

Lei Qin

Published Jan 1, 1991• 0 citations
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Abstract

In this paper we report the experimental results of generating stimulated radiation 4F-3D based on Hybrid exciting-energy transfer in K2-K system and four wave mixing frequency (FWMF) by dipole forbidden two-photon resonance in K atomic vapor.

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Acta Optica Sinica•Jan 1, 1993•1 citation
We study the generation of radiation at the 5P3/2‐4S1/2 transition of potassium vapor under excitation of the 4S1/2‐6S1/2 two‐photon resonance. The model consists of the coupled Maxwell‐Bloch equations for a four‐level configuration of Potassium atom including states 4S, 4P, 5P and 6S, which is numerically solved. Previous experimental studies have shown the emission of Parametric Four‐Wave Mixing (PFWM) radiation near the 5P3/2‐4S1/2 transition at low vapor pressures (P<1014 atoms/cm3) which is also shown in the case of the model studied.
We report the results of experimental investigation of radiations amplification in stimulated four-wave parametric mixing in potassium vapor using two cells holding active medium (generator-amplifier system). Under the two-photon excitation on 4S→6S transition, the gain of parametrically generated violet radiation on 5P→4S transitions is caused by the amplification of infrared radiation on 6S→5P transitions due to optically pumped stimulated emission process. The optimum conditions for seed radiations amplification are found. For these conditions we realized, for the first time, an image conversion from infrared region of spectrum (3.66 µ) to violet (0.4 µ) with quantum efficiency of conversion over 100% (“brightness intensification”).