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Proceedings Paper

A conceptual scheme for cophasing across gaps in segmented pupils with a laser guide star Fizeau interferometer
Author(s): Peter Tuthill
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Paper Abstract

Finding and maintaining an accurate cophasing solution for the large primary mirrors which comprise the coming generation of Extremely Large Telescopes has required a significant technological development effort that is still ongoing. Mirrors based on an assembly of a few large segments, such as the Giant Magellan Telescope (GMT – under construction) and the Large Binocular Telescope (LBT – operational) face a particular challenge: elements must be cophased across a gaps ranging from tens of centimeters to meters. Although it is widely believed that laser guide stars are not useful for this specific application, this paper advances a new concept that challenges this orthodoxy. By projecting a Fizeau interference pattern into the sky, and analyzing the form of the backscattered image, it is shown that at least in principle it is possible to cophase across arbitrary gaps.

Paper Details

Date Published: 19 August 2016
PDF: 7 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99070E (19 August 2016); doi: 10.1117/12.2232385
Show Author Affiliations
Peter Tuthill, The Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 9907:
Optical and Infrared Interferometry and Imaging V
Fabien Malbet; Michelle J. Creech-Eakman; Peter G. Tuthill, Editor(s)

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