Article 1407 A.H.Gevorgyan M.Z. Harutyunyan G. K. Matinyan K. B. Oganesyan Yu. V. Rostovtsev G. Kurizki M. O. Scully Laser Physics Letters 13 046002 (9pp) 2016 http://iopscience.iop.org/journal/1612-202X