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Abstract: 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. [Copyright &y& Elsevier]

Abstract: We present an indepth investigation of certain aspects of the two level on resonant multiphoton approximation to pair production from vacuum in the presence of strong electromagnetic fields. Numerical computations strongly suggest that a viable experimental verification of this approach using modern optical laser technology can be achieved. It is shown that use of higher harmonic within the presently available range of laser intensities can lead to multiphoton processes offering up to 1012 pairs per laser shot. Finally the range of applicability of this approximation is examined from the point of view of admissible values of electric field strength and energy spectrum of the created pairs. [Copyright &y& Elsevier]