title: Resolution of the relative phase ambiguity in spectral shearing interferometry of ultrashort pulses.
abstract: 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.
authors.affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK. dane.austin@physics.ox.ac.uk
authors.forename: Dane R
authors.initials: DR
authors.lastname: Austin
authors.forename: Tobias
authors.initials: T
authors.lastname: Witting
authors.forename: Ian A
authors.initials: IA
authors.lastname: Walmsley