Proposal for generating brilliant x-ray beams carrying orbital angular momentum

被引：143
|
作者：
Sasaki, Shigemi [1 ]
McNulty, Ian [1 ]
机构：
[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 12期
关键词：
D O I：
10.1103/PhysRevLett.100.124801
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We consider use of a variable polarizing undulator for generating brilliant x-ray beams carrying orbital angular momentum. We find that higher harmonics of the radiation correspond to Laguerre-Gaussian modes with azimuthal mode indices l equal to one less than the harmonic number when the undulator is operated to produce circularly polarized light. Beams with nonzero l carry orbital angular momentum quantized in units of lh per photon. When operated to produce linear polarization, the harmonics correspond to Hermite-Gaussian modes. Selection of these modes with conventional monochromator optics opens the door for new research with x-ray synchrotron and free-electron laser sources.
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页数：4
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