Polarization correlation in the superfluorescent decay process

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→8S→7P, mediated the nonlinear optical process. We observed 4.2-µm and 456-nm forward directional emissions generated on the 8S→7P and 7P→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.