Wavefront control with algorithmic differentiation on the HiCAT testbed

Scott D. Will; Marshall D. Perrin; Emiel H. Por; James Noss; Ananya Sahoo; Peter Petrone; Iva Laginja; Raphael Pourcelot; Susan M Redmond; Laurent Pueyo; Tyler D. Groff; James R. Fienup; Remi Soummer

doi:10.1117/12.2594283

1 September 2021 Wavefront control with algorithmic differentiation on the HiCAT testbed

Scott D. Will, Marshall D. Perrin, Emiel H. Por, James Noss, Ananya Sahoo, Peter Petrone, Iva Laginja, Raphael Pourcelot, Susan M Redmond, Laurent Pueyo, Tyler D. Groff, James R. Fienup, Remi Soummer

Author Affiliations +

Proceedings Volume 11823, Techniques and Instrumentation for Detection of Exoplanets X; 118230V (2021) https://doi.org/10.1117/12.2594283
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

Future space-based coronagraphs will rely critically on focal-plane wavefront sensing and control with deformable mirrors to reach deep contrast by mitigating optical aberrations in the primary beam path. Until now, most focal-plane wavefront control algorithms have been formulated in terms of Jacobian matrices, which encode the predicted effect of each deformable mirror actuator on the focal-plane electric field. A disadvantage of these methods is that Jacobian matrices can be cumbersome to compute and manipulate, particularly when the number of deformable mirror actuators is large. Recently, we proposed a new class of focal-plane wavefront control algorithms that utilize gradient-based optimization with algorithmic differentiation to compute wavefront control solutions while avoiding the explicit computation and manipulation of Jacobian matrices entirely. In simulations using a coronagraph design for the proposed Large UV/Optical/Infrared Surveyor (LUVOIR), we showed that our approach reduces overall CPU time and memory consumption compared to a Jacobian-based algorithm. Here, we expand on these results by implementing the proposed algorithm on the High Contrast Imager for Complex Aperture Telescopes (HiCAT) testbed at the Space Telescope Science Institute (STScI) and present initial experimental and numerical results.

Conference Presentation

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Scott D. Will, Marshall D. Perrin, Emiel H. Por, James Noss, Ananya Sahoo, Peter Petrone, Iva Laginja, Raphael Pourcelot, Susan M Redmond, Laurent Pueyo, Tyler D. Groff, James R. Fienup, and Remi Soummer "Wavefront control with algorithmic differentiation on the HiCAT testbed", Proc. SPIE 11823, Techniques and Instrumentation for Detection of Exoplanets X, 118230V (1 September 2021); https://doi.org/10.1117/12.2594283

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