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The $6S_{1/2}-5D_{5/2}$ electric quadrupole transition is investigated inCesium vapor at room temperature via nonlinear Doppler-free 6P-6S-5Dthree-level spectroscopy. Frequency-resolved studies of individual E2 hyperfinelines allow one to analyze optical pumping dynamics, polarization selectionrules and line intensities. It opens the way to studies of transfer of lightorbital angular momentum to atoms, and the influence of metamaterials on E2line spectra.

Doppler-free approach to optical pumping dynamics in the $6S_{1/2}- 5D_{5/2}$ electric quadrupole transition of Cesium vapor