Abstract
We have experimentally and theoretically studied the causes of the transparency spectra of the and transitions of atoms. Although, the two-photon resonance of the transition was not Doppler-free in an Rb vapor, we observed the transparency phenomenon in this transition. The main cause of the transparency of the transition was double-resonance optical pumping (DROP) due to two-step excitation, and that of the transition was DROP and electromagnetically induced transparency due to two-photon coherence. We confirmed the experimental results with theoretical results calculated using the density matrix equations considering all the degenerate magnetic sublevels of both transitions of the atoms.
©2012 Optical Society of America
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