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9 September 2019 Optimization of Lyot coronagraph focal plane masks for improved low-order wavefront sensing
Erkin Sidick, A.J. Eldorado Riggs
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Proceedings Volume 11117, Techniques and Instrumentation for Detection of Exoplanets IX; 111170G (2019) https://doi.org/10.1117/12.2529876
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States
Abstract
The WFIRST Coronagraph uses a Low-Order Wavefront Sensing and Control (LOWFS/C) subsystem to stabilize the stellar wavefront. This is true for the Hybrid Lyot Coronagraph (HLC), the Shaped Pupil Coronagraph (SPC) spectrograph, and the SPC wide field of view modes. For the SPC spectrograph, we have found via modeling and simulations that a focal plane mask (FPM) with an elliptical phase dimple can reduce the LOWFS errors significantly compared to the conventional, circular phase dimple. For HLC designs, we concurrently optimized the FPM parameters and deformable mirror shapes using our open-source software toolbox, the Fast Linearized Coronagraph Optimizer (FALCO). This process resulted in new FPMs with non-uniform central-area phase modulation. We have found in numerical simulations that such FPMs still provide sufficient LOWFS performance. In this paper, we will present the LOWFS performance for several new HLC and SPC FPM designs.
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Erkin Sidick and A.J. Eldorado Riggs "Optimization of Lyot coronagraph focal plane masks for improved low-order wavefront sensing", Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 111170G (9 September 2019); https://doi.org/10.1117/12.2529876
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KEYWORDS
Coronagraphy
Wavefront sensors
Wavefronts
Phase shifts
Exoplanets
Space telescopes
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