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Incoherent averaging of phase singularities in speckle-shearing interferometry

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Mantel,  Klaus
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Nercissian,  Vanusch
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Lindlein,  Norbert
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Mantel, K., Nercissian, V., & Lindlein, N. (2014). Incoherent averaging of phase singularities in speckle-shearing interferometry. OPTICS LETTERS, 39(15), 4510-4513. doi:10.1364/OL.39.004510.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-65CD-F
Abstract
Interferometric speckle techniques are plagued by the omnipresence of phase singularities, impairing the phase unwrapping process. To reduce the number of phase singularities by physical means, an incoherent averaging of multiple speckle fields may be applied. It turns out, however, that the results may strongly deviate from the expected root N behavior. Using speckle-shearing interferometry as an example, we investigate the mechanism behind the reduction of phase singularities, both by calculations and by computer simulations. Key to an understanding of the reduction mechanism during incoherent averaging is the representation of the physical averaging process in terms of certain vector fields associated with each speckle field. (C) 2014 Optical Society of America