The time evolution of coherent atomic system and probe light in an EIT   medium
  The adiabatic solutions of Maxwell-Bloch equation governing the three-level EIT medium is presented. The time evolution of the density matrix elements of the EIT system and the probe light is thus investigated by using the adiabatic approximation formulation and the slowly varying envelope condition. 
Jian Qi Shen & Zhi Chao Ruan