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International Journal of Optics
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2012
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Article
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Fig 7
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Review Article
Interferometry with Vortices
Figure 7
The trajectory of vortex points measured when a quarter wave plate is inserted between the Wollaston prism and rotated (a). The same situation applies but the quarter wave plate is wedge-like. Figure on the right shows part of the whole image.
(a)
(b)