Abstract
The evolution of the phase of a weak signal wave copropagating with a strong gate wave in a centrosymmetric medium is studied analytically and numerically for the case when the two waves are involved in a nearly phase-matched third-order process that generates a third wave It is shown that the signal wave collects, in addition to the phase shift that is due to the process, an extra nonlinear phase shift caused by cascading of two third-order nonlinear processes, and The attractive feature of this new type of cross-phase modulation is the fact that one can control its magnitude and sign by changing the wave-vector mismatch of the sum-frequency mixing process and the gate intensity.
© 1999 Optical Society of America
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