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arXiv · 2105.08006

Self-Focussing of an Intense X-Ray Beam in Vacuum

Roland Sauerbrey·Christian Kohlfürst
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Abstract

The quantum vacuum shows an intensity-dependent nonlinear index of refraction. Consequently, we may consider vacuum as a non-linear medium enabling, at sufficiently high field strengths, a direct interaction of light with light. In this context, we advocate an experiment to measure light-by-light scattering by the means of self-focussing of an x-ray beam in vacuum. Although hard to measure, we argue that for laser beams consisting of highly energetic photons the beams' power distribution carries a distinctive enough signature of self-focussing such that an observation at modern free-electron laser facilities appears possible. Self-focussing also imposes a limit on the most powerful x-ray beams that may propagate in vacuum being on the order of $10$ PW for $10$ keV x-rays.

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Roland Sauerbrey, Christian Kohlfürst. 2021-05-17. Self-Focussing of an Intense X-Ray Beam in Vacuum. https://arxiv.org/abs/2105.08006

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