1 July 2009 Crossed-cosine intensity filter for coronagraphy and low-order wavefront sensing
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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.
© (2009) Society of Photo-Optical Instrumentation Engineers (SPIE)
François Hénault, François Hénault, Alain Spang, Alain Spang, } "Crossed-cosine intensity filter for coronagraphy and low-order wavefront sensing," Optical Engineering 48(7), 073608 (1 July 2009). https://doi.org/10.1117/1.3183944 . Submission:

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