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Summary form only given. There has always been a close link in optically nonlinear media between solitons and high power beam break-up, i.e., modulational instability (MI). The classical example are temporal solitons, and the break-up of CW beams into a periodic pattern of pulses in fibers. Similarly for spatial solitons which have a finite spatial extent, very wide beams break up into periodic filaments...
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