title: Lateral shearing interferometry of high-harmonic wavefronts.
abstract: We present a technique for frequency-resolved wavefront characterization of high harmonics based on lateral shearing interferometry. Tilted replicas of the driving laser pulse are produced by a Mach-Zehnder interferometer, producing separate focii in the target. The interference of the resulting harmonics on a flat-field extreme ultraviolet spectrometer yields the spatial phase derivative. A comprehensive set of spatial profiles, resolved by harmonic order, validate the technique and reveal the interplay of single-atom and macroscopic effects.
authors: Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK. dane.austin@icfo.es
authors: Dane R
authors: DR
authors: Austin
authors: Tobias
authors: T
authors: Witting
authors: Christopher A
authors: CA
authors: Arrell
authors: Felix
authors: F
authors: Frank
authors: Adam S
authors: AS
authors: Wyatt
authors: Jon P
authors: JP
authors: Marangos
authors: John W G
authors: JW
authors: Tisch
authors: Ian A
authors: IA
authors: Walmsley