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Counter-propagating and suitably polarized light (laser) beams can provideconditions for pair production. Here, we consider in more detail the followingtwo situations: (i) In the homogeneity regions of anti-nodes of linearlypolarized ultra-high intensity laser beams, the Schwinger process isdynamically assisted by a second high-frequency field, e.g. by a XFEL beam.(ii) A high-energy probe photon beam colliding with a superposition ofco-propagating intense laser and XFEL beams gives rise to the laser assistedBreit-Wheeler process. Prospects of such bi-frequent field constellations withrespect to the feasibility of conversion of light into matter are discussed.

Pair production by Schwinger and Breit-Wheeler processes in bi-frequent fields