High Contrast Imaging With Phase-induced Amplitude Apodization (PIAA)

Details High Contrast Imaging With Phase-induced Amplitude Apodization (PIAA) High Contrast Imaging With Phase-induced Amplitude Apodization (PIAA)

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915515g&link_type=abstract

American Astronomical Society, AAS Meeting #219, #155.15

Physics

Optics

Scientific paper

The Phase Induced Amplitude Apodization (PIAA) concept uses aspheric optics to apodize a telescope beam for high contrast imaging. The lossless apodization, achieved through geometrical redistribution of the light (beam shaping) allows designs of high performance coronagraphs, ideally suited for direct imaging of exoplanets similar to Earth around nearby stars. The PIAA coronagraph concept has evolved since its original formulation to mitigate manufacturing challenges and improve performance. This is illustrated by the recently developed PIAACMC concept, which can offer sub-lambda/D inner working angle with PIAA optics that are relatively easy to manufacture. We will review the current status of PIAA technology, and show how new designs can allow high science return with small and moderately sized telescopes.
Our group is currently aiming at demonstrating PIAA coronagraphy in the laboratory to 1e-9 raw contrast at 2 lambda/D separation, first in monochromatic light, and then in 10% wide broadband light. Recent results from the High Contrast Imaging Testbed (HCIT) at NASA JPL and the PIAA testbed at NASA Ames will be presented. In parallel with this effort, we are developing and testing new designs with reduced inner working angle. One such system has been recently deployed on the Subaru Telescope as part of the Subaru Coronagraphic Extreme-AO (SCExAO) instrument, and is the first PIAA system used for science observations.

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