An improved locally constant field formula for laser-driven pair creation stays accurate at lower laser intensities than the standard version, reaching about 10 percent error at intensity parameter 1.25.
Multi-photon regime of non-linear Breit-Wheeler and Compton processes in short linearly and circularly polarized laser pulses
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abstract
Non-linear Breit-Wheeler $e^+e^-$ pair production and its crossing channel - the non-linear Compton process - in the multi-photon regime are analyzed for linearly and circularly polarized short laser pulses. The contribution of multi-photon processes to total cross sections is determined and we also show that (i) the azimuthal angular distributions of outgoing electrons in these processes differ on a qualitative level, and (ii) they depend on the polarization properties of the pulses. A finite carrier envelope phase (CEP) leads to a non-trivial non-monotonic behavior of the azimuthal angle distributions of the considered processes. That effect can be used for the CEP determination.
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A uniform locally constant field approximation for photon-seeded pair production
An improved locally constant field formula for laser-driven pair creation stays accurate at lower laser intensities than the standard version, reaching about 10 percent error at intensity parameter 1.25.