1 September 2017 The low-order wavefront control system for the PICTURE-C mission: preliminary testbed results from the Shack-Hartmann sensor
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Abstract
The Planetary Imaging Concept Testbed Using a Recoverable Experiment - Coronagraph (PICTURE-C) mission will directly image debris disks and exozodiacal dust around three nearby stars from a high-altitude balloon using a vector vortex coronagraph. We present experimental results of the PICTURE-C low-order wavefront control (LOWFC) system utilizing a Shack-Hartmann (SH) sensor in an instrument testbed. The SH sensor drives both the alignment of the telescope secondary mirror using a 6-axis Hexapod and a surface parallel array deformable mirror to remove residual low-order aberrations. The sensor design and actuator calibration methods are discussed and the preliminary LOWFC closed-loop performance is shown to stabilize a reference wavefront to an RMS error of 0.30 ± 0.29 nm.
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Glenn A. Howe, Glenn A. Howe, Christopher B. Mendillo, Christopher B. Mendillo, Kuravi Hewawasam, Kuravi Hewawasam, Jason Martel, Jason Martel, Susanna C. Finn, Susanna C. Finn, Timothy A. Cook, Timothy A. Cook, Supriya Chakrabarti, Supriya Chakrabarti, } "The low-order wavefront control system for the PICTURE-C mission: preliminary testbed results from the Shack-Hartmann sensor", Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104001Z (1 September 2017); doi: 10.1117/12.2274122; https://doi.org/10.1117/12.2274122
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