21 September 2012 End-to-end coronagraphic modeling including a low-order wavefront sensor
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Abstract
To evaluate space-based coronagraphic techniques, end-to-end modeling is necessary to simulate realistic fields containing speckles caused by wavefront errors. Real systems will suffer from pointing errors and thermal and motioninduced mechanical stresses that introduce time-variable wavefront aberrations that can reduce the field contrast. A loworder wavefront sensor (LOWFS) is needed to measure these changes at a sufficiently high rate to maintain the contrast level during observations. We implement here a LOWFS and corresponding low-order wavefront control subsystem (LOWFCS) in end-to-end models of a space-based coronagraph. Our goal is to be able to accurately duplicate the effect of the LOWFS+LOWFCS without explicitly evaluating the end-to-end model at numerous time steps.
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John E. Krist, John T. Trauger, Stephen C. Unwin, Wesley A. Traub, "End-to-end coronagraphic modeling including a low-order wavefront sensor", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 844253 (21 September 2012); doi: 10.1117/12.927143; https://doi.org/10.1117/12.927143
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