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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.
Brian Kern,Olivier Guyon,Amir Give'on,Andreas Kuhnert, andAlbert Niessner
"Laboratory testing of a Phase-Induced Amplitude Apodization (PIAA) coronagraph", Proc. SPIE 8151, Techniques and Instrumentation for Detection of Exoplanets V, 815104 (15 September 2011); https://doi.org/10.1117/12.896467
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Brian Kern, Olivier Guyon, Amir Give'on, Andreas Kuhnert, Albert Niessner, "Laboratory testing of a Phase-Induced Amplitude Apodization (PIAA) coronagraph," Proc. SPIE 8151, Techniques and Instrumentation for Detection of Exoplanets V, 815104 (15 September 2011); https://doi.org/10.1117/12.896467