Incoherent soliton, or in a more general perspective, self-trapped incoherent wave- packets, are a new direction into which soliton physics is evolving. Until 1995, all soliton experiments in nature employed a coherent “pulse”, i.e., the phases are correlated across the beam. However, pulses (localized wave- packets) do not necessarily need to be coherent. For example, one can focus into a spot a beam from a natural source such as the sun or an incandescent light bulb. Can such a beam self-trap in a nonlinear medium and form a soliton?
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