Abstract
Most nonlinear phase shifts are due to the interaction of two photons with the same atom. It was recently shown,1 however, that a large enhancement in the nonlinear phase shift can be achieved at the two-photon level via a mechanism in which two photons interact with a pair of atoms. Since the number of pairs of atoms is proportional to N2A where NA is the number of atoms in the medium, the nonlinear phase shift is proportional to N2A and not NA, as is usually the case.
© 1997 Optical Society of America
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