Multiple-wave lateral shearing interferometry with a liquid-crystal geometric phase grating

Emiel H. Por; Matthew A. Kenworthy; Sebastiaan Y. Haffert; Frans Snik; Yolanda Frensch; Joost Wardenier; Mantas Zilinskas

doi:10.1117/12.2595002

5 August 2021 Multiple-wave lateral shearing interferometry with a liquid-crystal geometric phase grating

Emiel H. Por, Matthew A. Kenworthy, Sebastiaan Y. Haffert, Frans Snik, Yolanda Frensch, Joost Wardenier, Mantas Zilinskas

Author Affiliations +

Proceedings Volume 11820, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems III; 118200J (2021) https://doi.org/10.1117/12.2595002
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

A multiple-wave lateral shearing interferometer extends upon the traditional lateral shearing interferometry by producing multiple sheared copies of the incoming light. By using a special grating instead of a shear plate, it is able to produce fringes in multiple directions at the same time. This makes it possible to do single-shot reconstruction of both phase and amplitude aberrations. Instead of a surface relief grating, we propose to use a patterned half-wave plate manufactured using direct-write techniques that acts as a liquid-crystal geometric phase grating. We demonstrate its wavefront sensing capabilities with laboratory measurements with an ALPAO-97 deformable mirror in monochromatic light. Finally, we present on-sky measurements performed at the William Herschel Telescope, showing broadband operation in unpolarized light.

Conference Presentation

Citation Download Citation

Emiel H. Por, Matthew A. Kenworthy, Sebastiaan Y. Haffert, Frans Snik, Yolanda Frensch, Joost Wardenier, and Mantas Zilinskas "Multiple-wave lateral shearing interferometry with a liquid-crystal geometric phase grating", Proc. SPIE 11820, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems III, 118200J (5 August 2021); https://doi.org/10.1117/12.2595002

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