A different neighborhood: holographic phase-shifting interferometry and global phase-unwrapping using a nearest neighbor criterion

Demetrious R. Dowdell; Thomas G. Brown

doi:10.1117/12.3028262

30 September 2024 A different neighborhood: holographic phase-shifting interferometry and global phase-unwrapping using a nearest neighbor criterion

Demetrious R. Dowdell, Thomas G. Brown

Author Affiliations +

Proceedings Volume 13135, Interferometry and Structured Light 2024; 1313508 (2024) https://doi.org/10.1117/12.3028262
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

To test a surface using a standard interferometer (Twyman-Green, Fizeau, etc.), one must have insight on the phase difference between the reference wavefront and that of the test surface. For optical path differences that exceed one wavelength, it is well known that one must combine phase estimation (modulo 2π) with a suitable phase unwrapping algorithm. We explore these steps in the specific context of holographic shearing interferometry for which the optical path variations for a single surface can vary from small fractions of a wavelength to many wavelengths, depending on the magnitude of the shear. Specifically, we employ phase-shifting interferometry using an iterative technique to solve for uncertainties in each phase step. This is followed by a global phase unwrapping algorithm specifically optimized to identify and correct for discontinuities due to air bubbles in the photopolymer.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Demetrious R. Dowdell and Thomas G. Brown "A different neighborhood: holographic phase-shifting interferometry and global phase-unwrapping using a nearest neighbor criterion", Proc. SPIE 13135, Interferometry and Structured Light 2024, 1313508 (30 September 2024); https://doi.org/10.1117/12.3028262

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