Abstract
Four-wave-mixing phenomena can give rise to coherent Kerr effects when the pump and probe beams overlap in time and space within the sample.1 Since these coherent effects greatly modify the material response at the pulse time scale, they should be fully analyzed if one is willing to extract the relative magnitude of the electronic contribution compared to the fast nonlinearities of nuclear origin. The amplitude of such coherent effects, already widely recognized, depends on the experimental configuration and mainly on the beam frequencies.
© 1994 Optical Society of America
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