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30 August 2019 Optical vortex emitted from free electrons in nature
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Optical vortex possesses helical wave-front and carries orbital angular momentum. This peculiar light has been produced artificially in laboratories and investigated toward various applications. Recently, is was experimentally demonstrated that radiation emitted from relativistic electrons in helical motion possesses helical wave-front. Based on the classical electrodynamics, it was shown that radiation from electrons in circular or helical motion possesses helical phase structure and carries orbital angular momentum. Such electrons should exist in various situations in nature, for example, in magnetospheres around stars or in intense circularly polarized light fields created in explosive phenomena. Therefore, optical vortices (vortex electromagnetic waves) should exist widely in nature and their wavelengths extend to the entire range from radio-waves to gamma-rays.
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Masahiro Katoh "Optical vortex emitted from free electrons in nature", Proc. SPIE 11099, Light in Nature VII, 1109903 (30 August 2019);

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