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Opt Lett. 2010 Jun 15;35(12):1971-3. doi: 10.1364/OL.35.001971.

Resolution of the relative phase ambiguity in spectral shearing interferometry of ultrashort pulses.

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Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK.


We show that multiple-shear spectral shearing interferometry can overcome the relative phase ambiguity of disjoint spectral components that is present in single-shear approaches. By upconverting the unknown pulse with spatially chirped ancillae, we achieve a shear-to-space mapping that can be acquired on an imaging spectrometer. A subset of this continuous range of shears can be chosen for robust and accurate phase retrieval using a multiple-shear algorithm.

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