From Event: SPIE Optical Engineering + Applications, 2017
The WFIRST/AFTA 2.4 m space telescope currently under study includes a stellar coronagraph for the imaging and the spectral characterization of extrasolar planets. The coronagraph employs sequential deformable mirrors to compensate for phase and amplitude errors. Using the optical model of an Occulting Mask Coronagraph (OMC) testbed at the Jet Propulsion Laboratory (JPL), we have investigated the sensitivity of a Hybrid Lyot Coronagraph (HLC) broadband contrast performance to DM actuator errors and actuator limits. Considered case include drifts in actuator gains or actuator response curves, paired actuators, as well as the limits imposed by a neighboring-actuator rule. Actual data about the actuator drifts and the knowledge about the paired-actuators obtained in several DM characterization experiments conducted at JPL, as well as the neighboring-actuator rule implemented on the OMC testbed were used in simulations. We obtained good agreement between the model prediction and the testbed measurement in terms of static HLC contrast floor and contrast chromaticity.
Erkin Sidick, Byoung-Joon Seo, Brian Kern, Ilya Poberezhskiy, Bijan Nemati, and John T. Trauger, "Sensitivity of WFIRST coronagraph broadband contrast performance to DM actuator errors," Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 1040006 (Presented at SPIE Optical Engineering + Applications: August 08, 2017; Published: 1 September 2017); https://doi.org/10.1117/12.2274421.
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