Apodized Apertures Using a Mach-Zehnder Interferometer. Laboratory Results

Details Apodized Apertures Using a Mach-Zehnder Interferometer. Laboratory Results Apodized Apertures Using a Mach-Zehnder Interferometer. Laboratory Results

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confq..24c&link_type=abstract

Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s

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A Mach-Zehnder interferometer can be used to obtain an apodized aperture for stellar coronagraphic applications. The image of the telescope entrance aperture is formed inside the two arms of the interferometer and additional opposite phase screens are placed there. Two complementary beams leave the Mach-Zehnder, corresponding to an apodized and an anti-apodized virtual apertures. We aim to use adequate phase screens to obtain apodizations in the form of prolate spheroidal functions. To date, we have obtained a one-dimensional cos(x) apodization by tilting the mirrors of the interferometer and a circular symmetric cos(x^2+y^2) apodization using as phase screens a divergent and a convergent lens of opposite powers. This method presents several advantages. No light is lost in the process of apodization. The chromatic effect induced by the interferometric process may be used to compensate for the chromaticity of coronagraphs. We will present at the conference the laboratory results obtained in monochromatic and white lights, that are in excellent agreement with theoretical predictions.

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