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Collapse of a Gaussian beam in self-focusing Kerr media arrested by nonlinearlosses may lead to the spontaneous formation of a quasi-stationary nonlinearunbalanced Bessel beam with finite energy, which can propagate withoutsignificant distortion over tens of diffraction lengths, and without peakintensity attenuation while the beam power is drastically diminishing.

Nonlinear unbalanced Bessel beams in the collapse of Gaussian beams arrested by nonlinear losses