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Coronagraph Design for Exoplanets Exploration

Echoing humanity's intellectual curiosity about extraterrestrial life, NASA's Astro2020 Decadal Survey identifies the search for biosignatures from exoplanets as a top scientific pursuit. A flagship mission aims to utilize infrared/optical/ultraviolet technologies to explore the universe for signs of life. This endeavor necessitates the development of space-borne coronagraphs capable of suppressing stellar light by a factor of 10 billion to reveal faint Earth-like companions.

This presents a formidable computational challenge in optimizing several thousand design parameters that specify finely tailored shapes of optical surfaces/planes, which manipulate optical wavefronts to suppress stellar light. Large telescope mirror structures pose further design challenges due to additional light scattering and mechanical deformations causing optical instabilities.

Collaborating with partners at NASA JPL, our primary objective is to significantly enhance the computational efficiency of telescope-coronagraph system analysis. By designing coronagraph pupil apodization and focal-plane masks for higher starlight suppression and better exoplanet light throughput, we aim to advance the capabilities of future NASA exoplanet missions. Our method-of-moments-based approach enables optimal pupil basis set computation and fast reconstruction, model order reduction for sensitivity analysis, and constrained least squares optimization for focal plane mask design.

> examples

Pupil apodization design — optimal pupil basis modes obtained numerically via method of moments

Pupil apodization design — optimal pupil basis modes obtained numerically via method of moments

Axisymmetric focal plane mask (FPM) design with increasing radii using constrained least squares

Axisymmetric focal plane mask (FPM) design with increasing radii using constrained least squares

Model order reduction based sensitivity analysis of coronagraph pupil aperture

Model order reduction based sensitivity analysis of coronagraph pupil aperture

Fast reconstruction of optimal pupil apodization for telescope coronagraph design

Fast reconstruction of optimal pupil apodization for telescope coronagraph design

Application of MoM in telescope coronagraph pupil and focal plane mask design

Application of MoM in telescope coronagraph pupil and focal plane mask design

> funding_agencies

NASA

> key_publications

  • Telescope coronagraph focal plane mask design using the method of moments and a constrained least squares

    Su Yan, L. Wise, and P. Chen2023 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization, Winnipeg, Canada, June 2023, 2023

  • Fast reconstruction of optimal pupil apodization for telescope coronagraph design based on the method of moments

    Su Yan and P. Chen2023 International Applied Computational Electromagnetics Society (ACES) Symposium, Monterey, CA, USA, Mar. 2023, 2023

  • Application of the method of moments in telescope coronagraph pupil and focal plane mask design (Invited Paper)

    Su Yan, L. Wise, and P. ChenProc. ICEAA-IEEE APWC 2023, Venice, Italy, 2023

  • Optimal pupil basis set for telescope-coronagraph design and perturbation analysis based on the method of moments

    Su Yan, P. Chen, M. I. Wade, and T. L. GillJ. Opt. Soc. Am. A, 2022

  • Model order reduction based sensitivity analysis of coronagraph pupil aperture

    Su Yan, P. Chen, M. I. Wade, T. L. Gill, and J. T. TraugerProc. IEEE Antennas Propag. Symp., Denver, CO, USA, July 2022, 2022

  • Method of moments based coronagraph pupil design for exoplanet exploration

    Su Yan, P. Chen, M. I. Wade, T. L. Gill, and J. T. Trauger2021 International Applied Computational Electromagnetics Society (ACES) Symposium, online, USA, Aug. 2021, 2021