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Interference between electromagnetically induced transparency and N-type resonances in Na vapor

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Abstract

We show theoretically and experimentally that the line shapes observed in ordinary electromagnetically induced transparency (EIT) experiments in sodium atomic vapor can be explained by the superposition of two processes, EIT and N-type resonances (NTR). When the higher frequency side of the Doppler absorption profile is excited, EIT is dominant, whereas, for the lower frequency side, NTR is dominant, and, in between, interference between EIT and NTR takes place. Theoretical simulations, based on a perturbative approach, agreed reasonably well with the experimental observations. The signal behavior concerning ac Stark shifts has also been studied for EIT and NTR; it was found that, although the signal peak always shifts toward the higher frequency in the case of EIT, for NTR, the shift can be nullified by adjusting the power balance of the two incident beams.

© 2015 Optical Society of America

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