Holographic shearing interferometry and its implications for freeform characterization

Demetrious R. Dowdell; Isabella S. Feraca; Thomas G. Brown

doi:10.1117/12.2675532

4 October 2023 Holographic shearing interferometry and its implications for freeform characterization

Demetrious R. Dowdell, Isabella S. Feraca, Thomas G. Brown

Proceedings Volume 12672, Applied Optical Metrology V; 126720S (2023) https://doi.org/10.1117/12.2675532
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Conference Poster

Abstract

This work explores combining the reference sphere and nulling hologram for freeform measurements by using a nulling reflection hologram in a Fizeau geometry. To do this, we combined standard phase shifting with an iterative algorithm to solve for errors in the phase steps, obtained a phase surface, and ultimately fit it to a set of Zernike polynomials. Preliminary results show that we can characterize a surface via Zernike coefficients using in situ holographic exposures followed by a sequence of interferograms using small (<100μm) values of lateral shear.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Demetrious R. Dowdell, Isabella S. Feraca, and Thomas G. Brown "Holographic shearing interferometry and its implications for freeform characterization", Proc. SPIE 12672, Applied Optical Metrology V, 126720S (4 October 2023); https://doi.org/10.1117/12.2675532

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