We study the Autler-Townes spectrum of a V-type atom coupled to a single-mode, frequency-tunable cavity field at finite termperature, with a pre-selected polarization in the bad cavity limit, and show that, when the mean number of thermal photons N≫1 and the excited sublevel splitting is very large (the same order as the cavity linewidth), the probe gain may occur at either sideband of the doublet, depending on the cavity frequency, due to the cavity-induced interference.
@article{arxiv.quant-ph/0004001,
title = {Interference-induced gain in Autler-Townes doublet of a V-type atom in a cavity},
author = {Peng Zhou and S. Swain and L. You},
journal= {arXiv preprint arXiv:quant-ph/0004001},
year = {2009}
}