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A surprise of nonlinear optics of few-cycle waves, such as the disappearance of the phenomenon of high-power radiation self-focusing, is discussed. An expression is derived and analyzed for the conditions under which the concept of a critical power for self-focusing loses its physical meaning due to the dominance of the process of dispersion over diffraction.doi:10.1088/1742-6596/1092/1/012066 fatcat:g5mcwzu6wfaq3fxewddda4rcry