A relativistic electron beam travelling on an undulating path interacts with a laser and emits light carrying orbital angular momentum. The wavelengths of these bright twisted-light beams can go down to those of hard X-rays.
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Couprie, ME. Twisted light from an electron beam. Nature Phys 9, 531–532 (2013). https://doi.org/10.1038/nphys2742
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DOI: https://doi.org/10.1038/nphys2742
