The Gemini Planet Imager’s performance was limited by speckle noise from post-coronagraph aberrations and internal optical imperfections. As part of the GPI 2.0 calibration unit upgrade, we demonstrate closed loop focal plane wavefront sensing and control techniques to enable higher contrast and smaller inner working angles. We present the experimental results of the classical speckle nulling method on a self-coherent camera, with contrast improvement by up to a factor of 3.2.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Duan Li, William Thompson, Dmitry Savransky, Christian Marois, "Focal plane wavefront control for the Gemini Planet Imager 2.0 calibration system (CAL2)," Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 1268014 (5 October 2023); https://doi.org/10.1117/12.2677478