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Two dimensional particle-in-cell simulations characterizing the interactionof ultraintense short pulse lasers in the range 10^{18} \leq I \leq 10^{20}W/cm^{2} with converging target geometries are presented. Seeking to examineintensity amplification in high-power laser systems, where focal spots aretypically non-diffraction limited, we describe key dynamical features as theinjected laser intensity and convergence angle of the target are systematicallyvaried. We find that laser pulses are focused down to a wavelength with thepeak intensity amplified by an order of magnitude beyond its vacuum value, anddevelop a simple model for how the peak location moves back towards theinjection plane over time. This performance is sustained over hundreds offemtoseconds and scales to laser intensities beyond 10^{20} W/cm^{2} at 1 \mu mwavelength.

Focusing of Intense Subpicosecond Laser Pulses in Wedge Targets