Abstract
Second-harmonic generation of light in bulk quadratic non-linear media with intense input beams containing phase dislocations is studied numerically under conditions for TypeI phase-matching. We investigate how, above a threshold light intensity, the input beams self-split along the azimuthal direction into a pattern of separate beams which then form a set of spatial solitons. The mechanism of such a behaviour is the azimuthal modulational instability of the ring-shaped, mutually trapped fundamental and second-harmonic beams containing the phase dislocations.
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Petrov, D.V., Torner, L. Second-harmonic generation by intense beams containing phase dislocations:self-breaking into sets of solitons. Optical and Quantum Electronics 29, 1037–1046 (1997). https://doi.org/10.1023/A:1018502305736
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DOI: https://doi.org/10.1023/A:1018502305736