AAS 207th Meeting, 8-12 January 2006
Session 110 Space-based Extra-Solar Planets: MOST, SPITZER, KEPLER, MPF
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[110.17] The PIAA Coronagraph: Optical design and Diffraction Effects

E.A. Pluzhnik (Subaru Telescope; Institute of Astronomy of Kharkov University, Ukraine), O. Guyon (Subaru Telescope), S. Ridgway (NOAO), F. Martinache (Cornell Univetsity), R. Woodruff (Lockheed Martin Space Corporation), C. Blain (Subaru Telescope), R. Galicher (Ecole Normale Superieure, Paris)

Properly apodized pupils are suitable for high dynamical range imaging of extrasolar terrestrial planets. Phase-induced amplitude apodization (PIAA) of the telescope pupil (Guyon 2003) combines the advantages of classical pupil apodization with full throughput, no loss of angular resolution and low chromaticity. Diffraction propagation effects can decrease both the achieved contrast and the spectral bandwidth of the coronagraph. We show here how the diffraction effects in the PIAA optics can be corrected by an appropriate optical design. The proposed hybrid coronagraph design preserves the 10-10 PSF contrast at \approx 1.5 \lambda/d required for efficient exoplanet imaging over the whole visible spectrum.

This work was carried out under JPL contract numbers 1254445 and 1257767 for Development of Technologies for the Terrestrial Planet Finder Mission, with the support and hospitality of the National Astronomical Observatory of Japan.

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