Abstract
We report the observation of modulational instability (MI) of a partially
spatially incoherent beam induced by seeding noise through cross-phase modulation.
We show experimentally that a threshold exists for such induced incoherent
MI to occur that depends on the degree of spatial coherence as well as on
the strength of the nonlinearity. Above threshold, the induced MI leads to
the formation of ordered and disordered patterns of incoherent light.
© 2001 Optical Society of America
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