Suppression of Reabsorption via Modulation of Light
Anthony R. Gorges, Ansel J. Foxley, David M. French, Christopher M. Ryan, Jacob L. Roberts
Abstract
Reabsorption, the multiple scattering of spontaneously emitted photons in optically thick gases, is a major limitation to efficient optical pumping and laser cooling in ultracold gases. We report mitigation of reabsorption using spatial and frequency modulation of laser light illuminating such gases. We developed a semi-classical model that successfully describes the reabsorption process when frequency-modulated light is present. It was necessary to extend the treatment in the model beyond a simple two-atom picture in order to reproduce our experimental results.
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