Phase mask coronagraphy: use of a Mach-Zehnder interferometer for achromatic four-quadrant phase masks

Alexis Carlotti; Claude Aime; Gilbert Ricort

doi:10.1117/12.786478

28 July 2008 Phase mask coronagraphy: use of a Mach-Zehnder interferometer for achromatic four-quadrant phase masks

Alexis Carlotti, Claude Aime, Gilbert Ricort

Proceedings Volume 7013, Optical and Infrared Interferometry; 70133S (2008) https://doi.org/10.1117/12.786478
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

Alexis Carlotti, Claude Aime, and Gilbert Ricort "Phase mask coronagraphy: use of a Mach-Zehnder interferometer for achromatic four-quadrant phase masks", Proc. SPIE 7013, Optical and Infrared Interferometry, 70133S (28 July 2008); https://doi.org/10.1117/12.786478

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