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Prolific electron-positron pair production is possible at laser intensities approaching 10^24 W cm^-2 at a wavelength of 1. An analysis of electron trajectories and interactions at the nodes (B=0) of two counterpropagating, circularly polarized laser beams shows that a cascade of rays and pairs develops. The geometry is generalized qualitatively to linear polarization and laser beams incident on a solid target.
Bell et al. (Tue,) studied this question.
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