Journal or Book Title
Physics Letters, Section B
We consider scattering of a photon on a short intense laser pulse at high energy. We argue that for ultrashort laser pulses the interaction is coherent over the entire length of the pulse. At low pulse intensity I the total cross section for electron–positron pair production is proportional to I. However, at pulse intensities higher than the characteristic value Is , the total cross section saturates – it becomes proportional to the logarithm of intensity. This non-linear effect is due to multi-photon interactions. We derive the total cross section for pair production at high energies by resuming the multi-photon amplitudes to all orders in intensity. We calculate the saturation intensity Is and show that it is significantly lower than the Schwinger’s critical value. We discuss possible experimental tests.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Tuchin, Kirill, "Non-linear pair production in scattering of photons on ultra-short laser pulses at high energy" (2010). Physics and Astronomy Publications. 142.