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In-situ Raman gain between hyperfine ground states in a potassium magneto-optical trap

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posted on 2023-11-30, 18:34 authored by Graeme Harvie, Adam Butcher, Jon Goldwin
We study optical gain in a gas of cold 39K atoms. The gain is observed during operation of a conventional magneto-optical trap without the need for additional fields. Measurements of transmission spectra from a weak probe show that the gain is due to stimulated Raman scattering between hyperfine ground states. The experimental results are reproduced by a simplified six-level model, which also helps explain why such gain is not observed in similar experiments with rubidium or cesium.

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