15 September 2011 Laboratory testing of a Phase-Induced Amplitude Apodization (PIAA) coronagraph
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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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Brian Kern, Brian Kern, Olivier Guyon, Olivier Guyon, Amir Give'on, Amir Give'on, Andreas Kuhnert, Andreas Kuhnert, Albert Niessner, 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); doi: 10.1117/12.896467; https://doi.org/10.1117/12.896467

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