Journal
OPTICS LETTERS
Volume 42, Issue 8, Pages 1516-1519Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.42.001516
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Funding
- National Science Foundation (NSF) [PHY1506321]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1506321] Funding Source: National Science Foundation
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The topological charge of a beam carrying an optical vortex is an important parameter that specifies the amount of orbital angular momentum carried by the beam and the azimuthal order of the beam mode. We present an experimental method to determine the sign and magnitude of the topological charge using a wedged optical flat as a lateral shearing interferometer. When the curvature of the wavefront is adjusted to be planar, the fringe pattern generated by the shearing interferometer consists of two conjoined forks that unambiguously identify the topological charge of the beam. We also investigated the changes in the pattern when the wedged flat is rotated. (C) 2017 Optical Society of America
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