Spontaneously generated coherence induced second-order susceptibility in atomic gases
Abstract
Description
The second-order susceptibility which vanishes in the electric-dipole approximation for an atom is induced by the spontaneously generated coherence. The spontaneously generated coherence considered in a lambda-type atomic system causes an indirect coupling between the lower two levels which acts equivalently as a DC-field and therefore makes possible the existence of second-order susceptibility.
5 pages, 2 figures
5 pages, 2 figures