Non-linear pair production in scattering of photons on ultra-short laser pulses at high energy |
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Authors: | Kirill Tuchin |
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Institution: | 1. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States;2. RIKEN BNL Research Center, Upton, NY 11973-5000, United States |
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Abstract: | We consider scattering of a photon on a short intense laser pulse at high energy. We argue that for ultra-short 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. |
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Keywords: | Non-linear pair production Attosecond lasers Non-linear quantum electrodynamics High energy |
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