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- Title
Measuring the topological charge of vortex beams by using an annular ellipse aperture.
- Authors
Tao, H.; Liu, Y.; Chen, Z.; Pu, J.
- Abstract
We theoretically and experimentally investigate the Fraunhofer diffraction pattern of a vortex beam passing through an annular ellipse aperture. It is found that the pattern of the far-field diffraction intensity distribution exhibits some dark spots, which become clearer with increasing the value of the ellipticity factor of the annular ellipse aperture. The diffraction phenomenon is more obvious with increasing the value of the ratio of the inner long axis (or short axis) to the outer side of the annular ellipse aperture. The number of the dark spots in the Fraunhofer diffraction intensity distribution is just equal to the topological charge value of the measured optical vortex, and the centre of each dark spot is just a phase-singularity point. Based on this property, we can measure the topological charge of an optical vortex beam.
- Subjects
BEAM optics; FRAUNHOFER lines; DIFFRACTION patterns; OPTICAL measurements; ELLIPSOMETRY; OPTICS; PHYSICS experiments
- Publication
Applied Physics B: Lasers & Optics, 2012, Vol 106, Issue 4, p927
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-012-4911-2