Abstract

We investigated the polarization properties of superfluorescence (SF) emitted from dense cesium atomic vapor in a cell. The atoms were excited from the $6S$ ground to the $8P$ state using a femtosecond laser pulse. The SF fields generated on the cascaded decay, $8P \to 8S \to 7P$, mediated the nonlinear optical process. We observed 4.2-µm and 456-nm forward directional emissions generated on the $8S \to 7P$ and $7P \to 6S$ transitions, respectively. The polarizations of the two fields were correlated in each laser shot, and their directions fluctuated from shot to shot, reflecting the noise that initiated the 4.2-µm emission.

© 2021 Optical Society of America

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