The stabilizing role of the nonlinearly induced diffraction on the critical balance between nonlinearity and linear diffraction at (2+1)D soliton-like beam propagation is studied. It is shown that regarding the static properties of such beams, the nonlinearly induced diffraction predominates over the effects of nonparaxiality and longitudinal field component. The dynamics of these solitary-wave beams is obtained and analyzed numerically in terms of variation of the input power.
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