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We study electromagnetically induced transparency (EIT) in a heated potassiumvapor cell, using a simple optical setup with a single free-running diode laserand an acousto-optic modulator. Despite the fact that the Doppler width iscomparable to the ground state hyperfine splitting, transparency windows withdeeply sub-natural line widths and large group indices are obtained. Alongitudinal magnetic field is used to split the EIT feature and inducemagnetooptical anisotropy. Using the beat note between co-propagating couplingand probe beams, we perform a heterodyne measurement of the circular dichroism(and therefore birefringence) of the EIT medium. The observed spectra revealthat lin-par-lin polarizations lead to greater anisotropy than lin-perp-lin. Asimplified analytical model encompassing sixteen Zeeman states and eighteen\Lamda\ subsytems reproduces the experimental observations.

Coherent control of group index and magneto-optical anisotropy in a multilevel atomic vapor