Periodic pattern of optical modulation instability (MI)1 results from the interplay between the diffraction and self-focusing effects. This interplay amplifies the noise, carried by the light beam, of certain spatial frequency. If the noise is from a static source (e.g. material defects), the resulted MI patterns are no different in either instantaneous or noninstantaneous media. However, it is not the case if the noise is from a dynamic source (e.g. random light scattering).

© 2002 Optical Society of America

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