Incoherent control of electromagnetically induced transparency and   Aulter-Townes splitting
  The absorption and dispersion of probe light is studied in an unified framework of three-level system, with coherent laser driving and incoherent pumping and relaxation. The electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) are studied in details. In the phase diagram of the unified three-level system, there are distinct parameter regimes corresponding to different lineshapes and mechanisms, and the incoherent transition could control the cross-over between EIT and ATS. The incoherent control of the three-level system enables the investigation of various phenomena in quantum optics, and is beneficial for experiments of light-matter interactions. 
Chang-Ling Zou, Yan-Lei Zhang, Liang Jiang, Xu-Bo Zou, Guang-Can Guo
physics.optics quant-ph