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Proceedings Paper

Phase mask coronagraphy: use of a Mach-Zehnder interferometer for achromatic four-quadrant phase masks
Author(s): Alexis Carlotti; Claude Aime; Gilbert Ricort
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Paper Abstract

We propose to use a Mach-Zehnder interferometer to greatly simplify and make achromatic the four quadrants phase mask coronagraph. The interferometer is used to get the achromatic π phase term. Two complementary binary masks of transmission 1 and 0 for quadrants of the same parity are set in the focal plane formed inside the interferometer. There is an equipartition of the energy in the exit aperture images, one being similar to the entrance aperture, the other being coronagraphied. We present preliminary results obtained with a coherent light. The current throughput of the experiment is 25 % only, but we give indications to improve it.

Paper Details

Date Published: 28 July 2008
PDF: 9 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 70133S (28 July 2008); doi: 10.1117/12.786478
Show Author Affiliations
Alexis Carlotti, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
Claude Aime, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
Gilbert Ricort, Univ. de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur (France)


Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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