Abstract
We studied the polarization spectroscopy of a linearly-polarized optical (probe) field in a multi-Zeeman-sublevel atomic system of the 87Rb D1 line. The polarization spectroscopy signals of the probe light result from the changes in its polarization, which are caused by a left-circularly polarized pumping beam. A theoretical analysis involving multiple Zeeman sublevels is presented and the results are in qualitative agreement with the experimental observations. Based on this phenomenon, we demonstrated a light switch at low light level (∼68 photons per λ2/2π) with a switching efficiency of ∼3%.
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