对极紫外区域螺旋波荡器产生的光学涡旋光束的观测。

Observation of an optical vortex beam from a helical undulator in the XUV region.

作者信息

Kaneyasu Tatsuo, Hikosaka Yasumasa, Fujimoto Masaki, Iwayama Hiroshi, Hosaka Masahito, Shigemasa Eiji, Katoh Masahiro

机构信息

Saga Light Source, Tosu 841-0005, Japan.

Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan.

出版信息

J Synchrotron Radiat. 2017 Sep 1;24(Pt 5):934-938. doi: 10.1107/S1600577517009626. Epub 2017 Aug 8.

DOI:10.1107/S1600577517009626

PMID:28862615

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.

摘要

报道了对波长为60纳米的光学涡旋光束的观测，该光束是由螺旋波荡器产生的二次谐波辐射。通过测量来自螺旋波荡器的涡旋光束与来自另一个波荡器的正常光束之间的干涉图样，验证了光学涡旋光束的螺旋波前。尽管由于电子束发射度相对较大，干涉图样略有模糊，但由于涡旋光束的螺旋波前，仍有可能观察到干涉特征。模拟结果很好地再现了实验结果。