Laboratory testing of a Phase-Induced Amplitude Apodization (PIAA) coronagraph

Details Laboratory testing of a Phase-Induced Amplitude Apodization (PIAA) coronagraph Laboratory testing of a Phase-Induced Amplitude Apodization (PIAA) coronagraph

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spie.8151e...3k&link_type=abstract

Techniques and Instrumentation for Detection of Exoplanets V. Edited by Shaklan, Stuart. Proceedings of the SPIE, Volume 8151,

Computer Science

Performance

Scientific paper

We present high-contrast images from laboratory testing of a Phase Induced Amplitude Apodization (PIAA) coronagraph at NASA's High Contrast Imaging Testbed (HCIT). Using a deformable mirror and wavefront estimation and control algorithms, we create a "dark hole" in the monochromatic point-spread function with an inner working angle of 2.05 fλ/D, with a mean intensity 3.5×10-8. We discuss the contributions to this floor, and the techniques being developed to improve it. We also present simulations that investigate the effect of Lyot stops of various sizes, and conclude that a Lyot stop is necessary for 10-9 performance but that an annular postapodizer is not necessary.

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