The Maxwell-Schrödinger Model for Three-Level Atomic System with Electromagnetic Field

In lasing without inversion, the essential idea is the absorption in cancellation by atomic coherence and interference. Usually this is accomplished in three-level atomic systems. In this work, the interaction of a three-level atom and the external electromagnetic field is discussed by the Maxwell-Schrddinger model. The atom is treated quantum mechanically by the Schrddinger equation, whereas the field is treated classically by the Maxwell's equations. An example is presented to demonstrate the effect of coherent trapping.