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We report on an experimental comparison on critical intensities of nonlinearself-focusing in air with conventional focusing and spatiotemporal focusingschemes. Our results show that the conventional focusing with the focal lenscompletely filled with the incident beam allows for the strongest axialintensity confinement against the self-focusing effect. This is because that inthe high-numerical-aperture condition, the focal spot will have a compact sizewhich results in a high focal intensity. Meanwhile, the Rayleigh length of thefocused beam will be substantially shortened which efficiently postpones theonset of self-focusing.

Spatiotemporal focusing does not always improve axial intensity localization