Abstract
We observe electromagnetically induced transparency (EIT) in a V-system in a thermal rubidium-87 vapour in the hyperfine Paschen-Back regime, realised with a 0.6 T axial magnetic field. In this regime energy levels are no longer degenerate and EIT features from different initial states are distinct, which we show produces a much cleaner feature than without a magnetic field. We compare our results to a model using the time-dependent Lindblad master equation, and having averaged over a distribution of interaction times, see good qualitative agreement for a range of pump Rabi frequencies. Excited state decay into both ground states is shown to play a prominent role in the generation of the transparency feature, which arises mainly due to transfer of population into the ground state not coupled by the probe beam. We use the model to investigate the importance of coherence in this feature, showing that its contribution is more significant at smaller pump Rabi frequencies.
Highlights
Induced transparency (EIT) is an optical phenomenon involving three quantum states coupled by two optical fields
The left panel shows experimental electromagnetically induced transparency (EIT) features with no magnetic field, which shows contributions from several transitions
We see that the EIT feature has contributions from a coherent process, and an incoherent optical pumping process
Summary
Induced transparency (EIT) is an optical phenomenon involving three quantum states coupled by two optical fields (laser beams). V-EIT is the least studied of these because there is no stable dark state [11], as both of the singly coupled states are excited states and can decay to the ground state. V-EIT has been extensively studied [6, 12,13,14,15,16,17,18,19,20,21,22,23,24,25], and provides an interesting testing ground for ascertaining the relative importance of coherent and incoherent mechanisms in the generation of the transparency window [16, 26, 27]
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