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Proceedings Paper

Multiplexed holographic aperture masking with liquid-crystal geometric phase masks
Author(s): D. S. Doelman; P. Tuthill; B. Norris; M. J. Wilby; E. H. Por; C. U. Keller; M. J. Escuti; F. Snik
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Paper Abstract

Sparse Aperture Masking (SAM) allows for high-contrast imaging at small inner working angles, however the performance is limited by the small throughput and the number of baselines. We present the concept and first lab results of Holographic Aperture Masking (HAM) with extreme liquid-crystal geometric phase patterns. We multiplex subapertures using holographic techniques to combine the same subaperture in multiple non-redundant PSFs in combination with a non-interferometric reference spot. This way arbitrary subaperture combinations and PSF configurations can be realized, giving HAM more uv-coverage, better throughput and improved calibration as compared to SAM, at the cost of detector space.

Paper Details

Date Published: 9 July 2018
PDF: 11 pages
Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 107010T (9 July 2018); doi: 10.1117/12.2313547
Show Author Affiliations
D. S. Doelman, Leiden Observatory, Leiden Univ. (Netherlands)
P. Tuthill, Australian Astronomical Observatory (Australia)
B. Norris, Australian Astronomical Observatory (Australia)
The Univ. of Sydney (Australia)
M. J. Wilby, Leiden Observatory, Leiden Univ. (Netherlands)
E. H. Por, Leiden Observatory, Leiden Univ. (Netherlands)
C. U. Keller, Leiden Observatory, Leiden Univ. (Netherlands)
M. J. Escuti, North Carolina State Univ. (United States)
F. Snik, Leiden Observatory, Leiden Univ. (Netherlands)

Published in SPIE Proceedings Vol. 10701:
Optical and Infrared Interferometry and Imaging VI
Michelle J. Creech-Eakman; Peter G. Tuthill; Antoine Mérand, Editor(s)

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