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Updated: Jul 17, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Emergence of X-shaped spatiotemporal coherence in optical waves
O Jedrkiewicz1, A Picozzi, M Clerici
1CNISM and Department of Physics and Mathematics, Università dell'Insubria, Via Valleggio 11, 22100 Como, Italy.
Abstract:
Considering the problem of parametric nonlinear interaction, we report the experimental observation of electromagnetic waves characterized by an X-shaped spatiotemporal coherence; i.e., coherence is neither spatial nor temporal, but skewed along specific spatiotemporal trajectories. The application of the usual, purely spatial or temporal, measures of coherence would erroneously lead to the conclusion that the field is fully incoherent. Such hidden coherence has been identified owing to an innovative diagnostic technique based on simultaneous analysis of both the spatial and temporal spectra.
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