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We describe a phase-retrieval-based imaging method to directly spatiallyresolve the vector lattice distortions in an extended crystalline sample byexplicit coupling of independent Bragg ptychography data sets into thereconstruction process. Our method addresses this multi-peak Bragg ptychography(MPBP) inverse problem by explicit gradient descent optimization of anobjective function based on modeling of the probe-lattice interaction, alongwith corrective steps to address spurious reconstruction artifacts. Robustconvergence of the optimization process is ensured by computing exact gradientswith the automatic differentiation capabilities of high-performance computingsoftware packages. We demonstrate MPBP reconstruction with simulatedptychography data mimicking diffraction from a single crystal membranecontaining heterogeneities that manifest as phase discontinuities in thediffracted wave. We show the superior ability of such an optimization-basedapproach in removing reconstruction artifacts compared to existing phaseretrieval and lattice distortion reconstruction approaches.

Imaging extended single crystal lattice distortion fields with multi-peak Bragg ptychography