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Speckle interferometry is an established optical metrology tool for thecharacterization of rough objects. The raw phase, however, is impaired by thepresence of phase singularities, making the unwrapping procedure ambiguous. Ina Michelson setup, we tailor the spatial coherence of the light source,achieving a physical averaging of independent, mutually incoherent specklefields. In the resulting raw phase, the systematic phase is preserved while thenumber of phase singularities is greatly reduced. Both interferometer arms areaffected by the averaging. The reduction is sufficient to even allow the use ofa standard unwrapping algorithm originally developed for smooth surfaces only.

Reducing phase singularities in speckle interferometry by coherence tailoring