Towards laser based improved experimental schemes for multiphoton e+e−e+e− pair production from vacuum

Numerical estimates for pair production from vacuum in the presence of strong electromagnetic fields are derived, for two experimental schemes: the first concerns a laser based X-FEL and the other imitates the E144 experiment. The approximation adopted in this work is that of two level multiphoton on resonance. Utilizing achievable values of laser beam parameters, an enhanced production efficiency of up to 1011 and 1015 pairs can be obtained, for the two schemes respectively.