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Raman amplification of a short laser pulse off a long laser beam has beendemonstrated successfully for moderate probe intensities ($\sim 10^{16}$W/cm$^2$) and widths ($\sim 50$ micron). However, truly competitive intensitiescan only be reached if the amplification process is carried out at much higherprobe intensities ($10^{17}-10^{18}$ W/cm$^2$ after amplification) and widths(1-10 mm). In this paper we examine the opportunities and challenges providedby this regime through the first 2-dimensional particle-in-cell simulationsusing wide pulses. A parameter window is identified in which a 10 TW, 600$\mu$m wide, 25 ps long laser pulse can be efficiently amplified to 2 PW peakintensity.

Efficient Raman amplification into the PetaWatt regime