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Figure 1
Experimental setup for measuring the interference pattern between the optical vortex and reference beams from two helical undulators in the XUV region. The reference beam with zero OAM was produced as the fundamental radiation of the upstream undulator #1, while the optical vortex beam was produced as the second-harmonic radiation of the downstream undulator #2. The photon beams from the undulators were monochromated by a 0.2 m Seya-Namioka monochromator. The intensity profile of the photon beam was measured by scanning a 0.4 mm-diameter pinhole. The throughput beam intensity was measured using a MCP.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 5| September 2017| Pages 934-938
https://doi.org/10.1107/S1600577517009626
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