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When an ultrashort laser pulse is tightly focused to a size approaching itscentral wavelength, the properties of the focused spot diverge from thediffraction limited case. Here we report on this change in behavior of atightly focused Petawatt class laser beam by an F/1 off-axis paraboloid (OAP).Considering the effects of residual aberration, the spatial profile of the nearfield and pointing error, we estimate the deviation in peak intensities of thefocused spot from the ideal case. We verify that the estimated peak intensityvalues are within an acceptable error range of the measured values. With theadded uncertainties in target alignment, we extend the estimation to inferon-target peak intensities of $\geq$ 10$^{22}$ W/cm$^{2}$ for a target at thefocal plane of this F/1 OAP.

Beam Distortion Effects upon focusing an ultrashort Petawatt Laser Pulse to greater than 10$^{22}$ W/cm$^{2}$