Authors
Sevda Mamaghani, Konstantinos Falaggis
Published in
Applied optics. Volume 65. Issue 32. Pages 11283-11292. Nov 10, 2026. Epub Oct 13, 2026.
Abstract
In this work, a grating-based dual-angle digital holographic shear interferometry system is presented for generating synthetic wavelengths and extending the measurable height range. A geometric-phase (GP) grating and mirror configuration generates laterally sheared wavefronts at multiple shear orientations, while a polarization camera enables simultaneous phase-shifted intensity acquisition. Measurements are performed at two illumination angles, and the reconstructed complex wavefields are combined to obtain a synthetic phase distribution whose sensitivity is determined by the angular separation between the two measurements. The system was experimentally evaluated using standard step-height artifacts and surface features on both reflective and diffuse samples. Step-height measurements demonstrated the dependence of measurement performance on the selected synthetic wavelength. An analytical uncertainty analysis identified the illumination angle as a significant contributor to the overall measurement uncertainty, emphasizing the importance of system calibration using a standard artifact. Temporal repeatability was also evaluated through repeated measurements. The results demonstrate the capability of grating-based dual-angle digital holographic shear interferometry for quantitative three-dimensional surface reconstruction while maintaining a compact common-path configuration.
PMID:
43008154
Bibliographic data and abstract were imported from PubMed on 11 Nov 2026.
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