Observation of an optical vortex beam from a helical undulator in the XUV region
Observation of an optical vortex beam from a helical undulator in the XUV region
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DOI：
10.1107/s1600577517009626
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发表时间：
2017-09-01
影响因子：
2.5
通讯作者：
Katoh, Masahiro
中科院分区：
文献类型：
--
作者：
Kaneyasu, Tatsuo;Hikosaka, Yasumasa;Katoh, Masahiro
报道了从螺旋波动器中产生的二次谐波光涡旋光束在60 nm波长上的观测结果。通过测量来自螺旋波动器的涡旋光束与来自另一个波动器的正常光束之间的干涉图，验证了光学涡旋光束的螺旋波前。虽然由于电子束发射度较大，干涉图样略有模糊，但由于涡流束的螺旋波前，可以观察到干涉特征。实验结果通过仿真得到了很好的再现。
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.