Observation of an optical vortex beam from a helical undulator in the XUV region |
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| Authors: | Tatsuo Kaneyasu Yasumasa Hikosaka Masaki Fujimoto Hiroshi Iwayama Masahito Hosaka Eiji Shigemasa Masahiro Katoh |
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| Affiliation: | 1. Saga Light Source, Tosu841-0005, Japan;2. Graduate School of Medicine and Pharmaceutical Sciences, University of 3. Toyama, Toyama930-0194, Japan;4. UVSOR Facility, Institute for Molecular Science, Okazaki444-8585, Japan;5. Sokendai (The Graduate University for Advanced Studies), Okazaki444-8585, Japan;6. Synchrotron Radiation Research Center, Nagoya University, Nagoya464-0824, Japan |
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| Abstract: | The observation of an optical vortex beam at 60 nm wavelength, produced as the second‐harmonic radiation from a helical undulator, is reported. The helical wavefront of the optical vortex beam was verified by measuring the interference pattern between the vortex beam from a helical undulator and a normal beam from another undulator. Although the interference patterns were slightly blurred owing to the relatively large electron beam emittance, it was possible to observe the interference features thanks to the helical wavefront of the vortex beam. The experimental results were well reproduced by simulation. |
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| Keywords: | XUV vortex helical undulator radiation interference |
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