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We investigate the decay time of a cavity containing strong dispersion achieved through EIT in 4He∗ with linear polarizations. The photon lifetime is shown to be governed by the group velocity of light.
4 He ∗ at room temperature is a particularly interesting system as velocity changing collisions (VCCs) are necessary to observe ultra-narrow (less than 10 kHz) EIT windows for purely electronic spins in the presence of Doppler broadening. Such narrow resonances are known to be linked to a dramatic reduction of the group velocity of a probe pulse, although the medium is transparent. The...
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