PIAA Coronagraph: the Method Overview

Details PIAA Coronagraph: the Method Overview PIAA Coronagraph: the Method Overview

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.7504p&link_type=abstract

American Astronomical Society, AAS Meeting #208, #75.04

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Scientific paper

To detect planets which are about $10^{10}$ times fainter then their parent stars, almost all light from the star should be eliminated while keeping most of the planet light. The appropriate contrast level can be provided with properly apodized telescope pupils. Unfortunately, classical pupil apodization suffers from low throughput and large inner working angle. A recently proposed (Guyon 2003) alternative to the ``classical'' pupil apodization is to geometrically remap the entrance pupil of the telescope into an apodized pupil (phase-induced amplitude apodization or PIAA). The PIAA technique combines many of the advantages found separately in other coronagraphs: (1) almost 100% throughput for the planet's light, (2) small inner working angle (less then $2\lambda/D$) and (3) exellent achromaticity. It opens the way to fullfill the TPF-C science goals with a 4-m telescope instead of 8-meter telescope with more conventional coronagraphs.

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