Temperature variation of ultraslow light in a cold gas
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abstract
The Maxwell-Bloch equations for a gas of non-interacting bosons initially in thermal equilibrium were solved. An analytic expression was derived for the group velocity of light in a cold gas for two cases: atoms confined in a box and by a harmonic potential. Results show that the variation of the spatial density of atoms with the temperature is the major factor responsible for the temperature dependence of the group velocity.
