Three configurations for EIT: (a) ladder; (b) lambda; and (c) V. The frequencies and correspond to the coupling and probe laser frequencies, respectively.
Energy level diagram for rubidium. The relevant hyperfine levels for and are shown in the expanded view on the right-hand side.
Theoretical curves for the (a) absorption and (b) dispersion of the probe beam. The coupling laser detuning is zero and the Rabi frequency is .
Theoretical absorption spectra for various coupling laser strengths and zero coupling laser detuning.
Apparatus for the ladder-type EIT experiment. Components include grating-feedback diode lasers (DL), quarter-wave plates , linear polarizers (Pol), neutral density filter (NDF), beamsplitter (BS), polarizing beam splitter (PBS), lenses (L), rubidium cells, and photodetectors (PD). The fluorescence detection equipment (optional) includes a interference filter and photomultiplier tube (PMT).
Doppler-broadened absorption peaks with EIT features. The peak on the left [right] originates from the [ ] energy state. Spectra were taking using coupling lasers powers of 12 and .
Fluorescence spectra from the cascade decay. The peak on the left [right] originates from the [ ] energy state. Spectra were taking using coupling laser powers of 12 and .
An expanded view of the hyperfine features of EIT in the absorption spectra (solid) and corresponding fluorescence spectra (dashed) for (a) and (b) . The fluorescence spectra are inverted for clarity. The vertical scale is relative. The resolved peaks in the spectra correspond to the , , and hyperfine levels of the state.
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