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Patterned liquid-crystal optics for broadband coronagraphy and wavefront sensing
Author(s): David S. Doelman; Frans Snik; Nathaniel Z. Warriner; Michael J. Escuti
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Paper Abstract

The direct-write technology for liquid-crystal patterns allows for manufacturing of extreme geometric phase patterned coronagraphs that are inherently broadband, e.g. the vector Apodizing Phase Plate (vAPP). We present on-sky data of a double-grating vAPP operating from 2-5 μm with a 360-degree dark hole and a decreased leakage term of ∼ 10−4 . We report a new liquid-crystal design used in a grating-vAPP for SCExAO that operates from 1-2.5μm. Furthermore, we present wavelength-selective vAPPs that work at specific wavelength ranges and transmit light unapodized at other wavelengths. Lastly, we present geometric phase patterns for advanced implementations of WFS (e.g. Zernike-type) that are enabled only by this liquid-crystal technology.

Paper Details

Date Published: 1 September 2017
PDF: 12 pages
Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000U (1 September 2017); doi: 10.1117/12.2273406
Show Author Affiliations
David S. Doelman, Leiden Observatory (Netherlands)
Frans Snik, Leiden Observatory (Netherlands)
Nathaniel Z. Warriner, North Carolina State Univ. (United States)
Michael J. Escuti, North Carolina State Univ. (United States)


Published in SPIE Proceedings Vol. 10400:
Techniques and Instrumentation for Detection of Exoplanets VIII
Stuart Shaklan, Editor(s)

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