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Optical Engineering

Crossed-cosine intensity filter for coronagraphy and low-order wavefront sensing
Author(s): François Hénault; Alain Spang
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Paper Abstract

A crossed-cosine spatial filter suitable for Lyot coronagraphy is presented. With respect to other proposed designs, this filter presents the advantage of being usable for low-order wavefront sensing. Wavefront measurement accuracies were simulated numerically and found to be better than λ/10 peak-to-valley and λ/100 root mean square, which is a performance comparable to the best currently available wavefront measuring techniques. The crossed-cosine filter could be integrated into a cascaded coronagraph, either spaceborne or ground-based, of which it would constitute the first stage.

Paper Details

Date Published: 1 July 2009
PDF: 7 pages
Opt. Eng. 48(7) 073608 doi: 10.1117/1.3183944
Published in: Optical Engineering Volume 48, Issue 7
Show Author Affiliations
François Hénault, Observatoire de la Côte d'Azur (France)
Alain Spang, Observatoire de la Côte d'Azur (France)

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