  We analytically show how a superposition of beamlets produces terahertz
radiation with greater spatial homogeneity and efficiency compared to
tilted-pulse-fronts generated by diffraction gratings. The advantages are
particularly notable for large pump bandwiths and beam sizes, alluding to
better performance in the presence of cascading effects and higher energy
pumping. A theory of terahertz generation using a superposition of beamlets is
developed. It is shown how such an arrangement produces a distortion free
tilted-pulse-front. Closed form expressions for terahertz spectra and
transients in three spatial dimensions are derived. Conditions for obtaining
performance parity and bounds for optimal parameters are furnished.
