OBSERVATION OF TRANSPARENCY AND POPULATION TRAPPING DUE TO ATOMIC COHERENT EFFECTS

The electromagnetically induced transparency in a V-shaped atomic syst em is observed by a spectroscopy technique. The experimental results s how that the absorption coefficient at maximum coherence is reduced by about 72% of the maximum absorption alpha(0), which is the case witho ut the coherent effect. Meanwhile we also observed indirectly populati on trapping in the two excited states, which means that there is no de cay via spontaneous or stimulated emission to the lower state.