Dr. Scott D. Will Profile

Dr. Scott D. Will

Optical Engineer at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 23 August 2024 Presentation + Paper

Presentation + Paper

High-contrast imager for complex aperture telescopes (HiCAT): 11. System-level demonstration of the apodized pupil Lyot coronagraph with a segmented aperture in air

Rémi Soummer, Raphaël Pourcelot, Emiel Por, Sarah Steiger, Iva Laginja, Benjamin Buralli, Susan Redmond, Laurent Pueyo, Marshall Perrin, Marc Ferrari, Jules Fowler, John Hagopian, Mamadou N'Diaye, Meiji Nguyen, Bryony Nickson, Peter Petrone, Ananya Sahoo, Anand Sivaramakrishnan, Scott Will

Proceedings Volume 13092, 130921Z (2024) https://doi.org/10.1117/12.3018037

KEYWORDS: Coronagraphy, Telescopes, Imaging systems, Wavefronts, Phase retrieval, Exoplanets

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We present the final results of the Apodized Pupil Lyot Coronagraph (APLC) on the High-contrast imager for Complex Aperture Telescopes (HiCAT) testbed, under NASA’s Strategic Astrophysics Technology program. The HiCAT testbed was developed over the past decade to enable a system-level demonstration of coronagraphy for exoplanet direct imaging with the future Habitable Wolds Observatory. HiCAT includes an active, segmented telescope simulator, a coronagraph, and metrology systems (Low-order and Mid-Order Zernike Wavefront Sensors, and Phase Retrieval camera). These results correspond to an off-axis (un-obscured) configuration, as was envisioned in the 2020 Decadal Survey Recommendations. Narrowband and broadband dark holes are generated using two continuous deformable mirrors (DM) to control high order wavefront aberrations, and low-order drifts can be further stabilized using the LOWFS loop. The APLC apodizers, manufactured using carbon nanotubes, were optimized for broadband performance and include the calibrated geometric aperture. The objectives of this SAT program were organized in three milestones to reach a system-like level demonstration of segmented-aperture coronagraphy, from static component demonstration to system-level demonstration under both natural and artificial disturbances. HiCAT is, to this date, the only testbed facility able to demonstrate high-contrast coronagraphy with a truly segmented aperture, as is required for the Habitable World Observatory, albeit limited to ambient conditions, corresponding to NASA’s Technology Readiness Level (TRL) 4. Results presented here include 6 × 10⁻⁸ (90% CI) contrast in 9% bandpass in a 360 deg dark hole with inner and outer working angles of 4.4λ/D_pupil and 11λ/D_pupil. Narrowband contrast (3% bandpass) reaches 2.4 × 10⁻⁸ (90% confidence interval). We first explore the open-loop stability of the entire system quantify the baseline testbed performance. Then we present dark hole stabilization using both high-order and low-order loops under both low-order and segment level drifts in narrow and broadband. We compare experimental data with that obtained by the end-to-end HiCAT simulator. We establish that current performance limitations are due to a combination of ambient conditions, detector and deformable mirrors noises (including quantization), and model mismatch.

Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

ExoSpec project: exoplanet spectroscopy technologies for the Habitable Worlds Observatory at NASA’s Goddard Space Flight Center

Michael McElwain, Neil Zimmerman, Bernard Rauscher, Tyler Groff, Avi Mandell, Eleonora Alei, Tyler Baines, Joshua Berrier, Harrison Bradley, Qian Gong, Alex Howe, Roser Juanola-Parramon, Emily Kan, Daniel Kelly, Vincent Kofman, Breann Sitarski, Christopher Stark, Hari Subedi, Geronimo Villanueva, Scott Will

Proceedings Volume 13092, 130925K (2024) https://doi.org/10.1117/12.3020211

KEYWORDS: Exoplanets, Coronagraphy, Deformable mirrors, Iterated function systems, Observatories, Charge-coupled devices, Spectroscopy, Actuators, Equipment, CCD image sensors

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Proceedings Article | 23 August 2024 Paper

Paper

Experimental verification of the parabolic deformable mirror for the ExoSpec project

Hari Subedi, Tyler Groff, Scott Will, Qian Gong, Joshua Berrier, Michael McElwain, Roser Juanola-Parramon

Proceedings Volume 13092, 1309260 (2024) https://doi.org/10.1117/12.3018914

KEYWORDS: Coronagraphy, Wavefronts, Wavefront sensors, Wavefront errors, Optical alignment, Deformable mirrors, Actuators, Optical components, Interferometers, Wavefront aberrations

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Proceedings Article | 23 August 2024 Presentation + Paper

Presentation + Paper

How to train your Jacobian: least-squares system identiﬁcation for space-based coronagraphy

Scott Will, Meiji Nguyen, Raphaël Pourcelot, Hari Subedi, Tyler Groff, Rémi Soummer

Proceedings Volume 13092, 1309226 (2024) https://doi.org/10.1117/12.3020344

KEYWORDS: Electric fields, Coronagraphy, System identification, Expectation maximization algorithms, Simulations, Exoplanets, Mathematical optimization, Adaptive control, Wavefront compensation, Wavefront sensors

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SPIE Journal Paper | 4 March 2024 Open Access

Open Access

Implementation of a dark zone maintenance algorithm for speckle drift correction in a high contrast space coronagraph (Erratum)

Susan Redmond, Leonid Pogorelyuk, Laurent Pueyo, Emiel Por, James Noss, Scott Will, Iva Laginja, Keira Brooks, Matthew Maclay, J. Fowler, N. Jeremy Kasdin, Marshall Perrin, Rémi Soummer

JATIS, Vol. 10, Issue 01, 019801, (March 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.1.019801

KEYWORDS: Speckle, Coronagraphy, Space telescopes, Solids

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SPIE Journal Paper | 19 December 2023 Open Access

Open Access

High-order coronagraphic wavefront control with algorithmic differentiation: first experimental demonstration

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

JATIS, Vol. 9, Issue 04, 045004, (December 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.4.045004

KEYWORDS: Coronagraphy, Wavefronts, Actuators, Electric fields, Matrices, Mathematical optimization, Tolerancing, Image segmentation, Nonlinear optimization, Design

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Proceedings Article | 6 October 2023 Presentation

Presentation

High-contrast imager for complex aperture telescopes (HiCAT): 10. Broadband Zernike wavefront sensor under natural and artificial drifts

Raphaël Pourcelot, Emiel Por, Mamadou N'Diaye, Benjamin Buralli, Marcel Carbillet, Kjetil Dohlen, Sylvain Egron, Marc Ferrari, Rachel Fox, Rob Gontrum, Iva Laginja, Meiji Nguyen, Bryony Nickson, Marshall Perrin, Peter Petrone, Laurent Pueyo, Susan Redmond, Ananya Sahoo, Anand Sivaramakrishnan, Hari Subedi, Sam Weinstock, Scott Will, Rémi Soummer, John Hagopian

Proceedings Volume 12680, 126801F (2023) https://doi.org/10.1117/12.2677790

KEYWORDS: Wavefront sensors, Telescopes, Imaging systems, Coronagraphy, Deformable mirrors, Stars, Monochromatic aberrations, Image segmentation, Wavefront aberrations, Observatories

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

High-contrast Jacobian-free wavefront control: simulations, experimental results, and extensions to adaptive control

Scott Will, Tyler Groff, Rémi Soummer, Hari Subedi, Laurent Pueyo, Marshall Perrin, Emiel Por, Neil Zimmerman, Michael McElwain, Christopher Stark, Roser Juanola-Parramon

Proceedings Volume 12680, 126801E (2023) https://doi.org/10.1117/12.2677396

KEYWORDS: Coronagraphy, Actuators, Simulations, Wavefronts, Mathematical optimization, Algorithm development, Matrices, Observatories, Wavefront sensors, Wavefront reconstruction, Exoplanets, Computational imaging

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

First generation parabolic deformable mirror for the ExoSpec project

Hari Subedi, Tyler Groff, Scott Will, Roser Juanola-Parramon

Proceedings Volume 12680, 1268013 (2023) https://doi.org/10.1117/12.2677625

KEYWORDS: Wavefronts, Actuators, Deformable mirrors, Wavefront aberrations, Simulations, Parabolic mirrors, Optical alignment, Coronagraphy, Mirrors, Manufacturing

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SPIE Journal Paper | 9 September 2022

Implementation of a dark zone maintenance algorithm for speckle drift correction in a high contrast space coronagraph

Susan Redmond, Leonid Pogorelyuk, Laurent Pueyo, Emiel Por, James Noss, Scott Will, Iva Laginja, Keira Brooks, Matthew Maclay, J. Fowler, N. Jeremy Kasdin, Marshall Perrin, Rémi Soummer

JATIS, Vol. 8, Issue 03, 035001, (September 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.3.035001

KEYWORDS: Electric fields, Simulations, Histograms, Error analysis, Speckle, Space telescopes, Image segmentation, Humidity, Coronagraphy, Telescopes

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Proceedings Article | 27 August 2022 Presentation + Paper

Presentation + Paper

High-contrast imager for complex aperture telescopes (HiCAT): 8. Dark zone demonstration with simultaneous closed-loop low-order wavefront sensing and control

Rémi Soummer, Emiel Por, Raphaël Pourcelot, Susan Redmond, Iva Laginja, Scott Will, Marshall Perrin, Laurent Pueyo, Ananya Sahoo, Peter Petrone, Keira Brooks, Rachel Fox, Alex Klein, Bryony Nickson, Thomas Comeau, Marc Ferrari, Rob Gontrum, John Hagopian, Lucie Leboulleux, Daniel Leongomez, Joe Lugten, Laurent Mugnier, Mamadou N'Diaye, Meiji Nguyen, James Noss, Jean-François Sauvage, Nathan Scott, Anand Sivaramakrishnan, Hari Subedi, Sam Weinstock

Proceedings Volume 12180, 1218026 (2022) https://doi.org/10.1117/12.2630444

KEYWORDS: Coronagraphy, Wavefronts, Wavefront sensors, Telescopes, Phase retrieval

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Proceedings Article | 1 September 2021 Paper

Paper

Implementation of a broadband focal plane estimator for high-contrast dark zones

Susan Redmond, Laurent Pueyo, Leonid Pogorelyuk, James Noss, Scott Will, Iva Laginja, N. Jeremy Kasdin, Marshall Perrin, Rémi Soummer

Proceedings Volume 11823, 118231Q (2021) https://doi.org/10.1117/12.2594620

KEYWORDS: Image analysis, Exoplanets, Wavefronts, Stars, Spectroscopy

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Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Experimental validation of active control of low-order aberrations with a Zernike sensor through a Lyot coronagraph

Raphaël Pourcelot, Mamadou N'Diaye, Emiel Por, Marshall Perrin, Rémi Soummer, Iva Laginja, Ananya Sahoo, Marcel Carbillet, Greg Brady, Kjetil Dohlen, Matthew Maclay, Evelyn McChesney, James Noss, Pete Petrone, Laurent Pueyo, Arthur Vigan, Scott Will

Proceedings Volume 11823, 118231M (2021) https://doi.org/10.1117/12.2594609

KEYWORDS: Wavefronts, Coronagraphy, Turbulence, Wavefront sensors, Telescopes, Exoplanets

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Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Wavefront control with algorithmic differentiation on the HiCAT testbed

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

Proceedings Volume 11823, 118230V (2021) https://doi.org/10.1117/12.2594283

KEYWORDS: Exoplanets, Space telescopes, Algorithms, Adaptive optics, Control systems, Actuators, Coronagraphy, Wavefronts, Optimization (mathematics), Algorithm development, Point spread functions, Wavefront sensors

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Proceedings Article | 4 August 2021 Presentation

Presentation

High-contrast imager for complex aperture telescopes (HiCAT): 7. Dark zone demonstration with fully segmented aperture coronagraph

Rémi Soummer, Iva Laginja, Scott Will, Marshall Perrin, James Noss, Emiel Por, Susan Redmond, Raphaël Pourcelot, Ananya Sahoo, Peter Petrone, Keira Brooks, Laurent Pueyo, Bryony Nickson, Matt Maclay, Gregory Brady, Thomas Comeau, Julia Fowler, Kelsey Glazer, Rob Gontrum, John Hagopian, Theo Jolivet, Maggie Kautz, Lucie Leboulleux, Evelyn McChesney, Laurent Mugnier, Mamadou N'Diaye, Meiji Nguyen, Heather Olszewski, Leonid Pogorelyuk, Jaret Prothro, Jean-François Sauvage, Nathan Scott, Ron Shiri, Anand Sivaramakrishnan, Hari Subedi, Sam Weinstock, Yinzi Xin, Rebecca Zhang

Proceedings Volume 11823, 118230T (2021) https://doi.org/10.1117/12.2594684

KEYWORDS: Image segmentation, Coronagraphy, Telescopes, Imaging systems, Wavefront sensors, Wavefronts, Deformable mirrors, Ultraviolet telescopes, Ultraviolet radiation, UV optics

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SPIE Journal Paper | 18 February 2021

Jacobian-free coronagraphic wavefront control using nonlinear optimization

Scott Will, Tyler Groff, James Fienup

JATIS, Vol. 7, Issue 01, 019002, (February 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.019002

KEYWORDS: Coronagraphy, Wavefronts, Nonlinear control, Actuators, Optimization (mathematics), Computer simulations, Detection and tracking algorithms, Reverse modeling, Wave propagation, Algorithm development

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Proceedings Article | 15 December 2020 Presentation + Paper

Presentation + Paper

Implementation of a dark hole maintenance algorithm for speckle drift in a high contrast space coronagraph

Susan Redmond, N. Jeremy Kasdin, Leonid Pogorelyuk, Remi Soummer, Laurent Pueyo, Marshall Perrin, Matthew Maclay, James Noss, Iva Laginja, Scott Will, Julia Fowler

Proceedings Volume 11443, 114432K (2020) https://doi.org/10.1117/12.2561488

KEYWORDS: Coronagraphy, Speckle, Planets, Wavefronts, Photons, Space telescopes, Adaptive optics, Detection and tracking algorithms, Deformable mirrors, Remote sensing

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Poster + Presentation + Paper

Estimating low-order aberrations through a Lyot coronagraph with a Zernike wavefront sensor for exoplanet imaging

Raphaël Pourcelot, Mamadou N'Diaye, Greg Brady, Marcel Carbillet, Kjetil Dohlen, Julia Fowler, Iva Laginja, Matthew Maclay, James Noss, Marshall Perrin, Pete Petrone, Emiel Por, Jean-François Sauvage, Rémi Soummer, Arthur Vigan, Scott Will

Proceedings Volume 11443, 1144346 (2020) https://doi.org/10.1117/12.2562159

KEYWORDS: Space telescopes, Coronagraphy, Sensors, Telescopes, Stars, Image segmentation, Planets, Wavefronts, Mirrors, Calibration

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Predicting contrast sensitivity to segmented aperture misalignment modes for the HiCAT testbed

Iva Laginja, Rémi Soummer, Laurent Mugnier, Laurent Pueyo, Jean-François Sauvage, Lucie Leboulleux, Laura Coyle, J. Scott Knight, Marshall Perrin, Scott Will, James Noss, Keira Brooks, Julia Fowler

Proceedings Volume 11443, 114433J (2020) https://doi.org/10.1117/12.2560113

KEYWORDS: Image segmentation, Coronagraphy, Contrast sensitivity, Wavefronts, Space telescopes, Telescopes, Tolerancing, Exoplanets, Mirrors, Optical aberrations

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

The LUVOIR Extreme Coronagraph for Living Planetary Systems (ECLIPS) I: searching and characterizing exoplanetary gems

L. Pueyo, C. Stark, R. Juanola-Parramon, N. Zimmerman, M. Bolcar, A. Roberge, G. Arney, G. Ruane, A. Riggs, R. Belikov, D. Sirbu, D. Redding, R. Soummer, I. Laginja, S. Will

Proceedings Volume 11117, 1111703 (2019) https://doi.org/10.1117/12.2530722

KEYWORDS: Coronagraphy, Exoplanets, Astrophysics, Planets, Stars, Imaging systems, Planetary systems, Cameras, Wavefront sensors, Observatories

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Proceedings Article | 9 September 2019 Presentation

Presentation

High-contrast imager for complex aperture telescopes (HiCAT): 6. Two deformable mirror wavefront control (Conference Presentation)

Rémi Soummer, Iva Laginja, Scott Will, Roser Juanola-Parramon, Peter Petrone, Greg Brady, James Noss, Marshall Perrin, Julia Fowler, Heather Kurtz, Kathryn St. Laurent, Kevin Fogarty, Evelyn McChesney, Nathan Scott, Keira Brooks, Thomas Comeau, Marc Ferrari, Rob Gontrum, John Hagopian, Emmanuel Hugot, Lucie Leboulleux, Johan Mazoyer, Laurent Mugnier, Mamadou N'Diaye, Laurent Pueyo, Jean-François Sauvage, Ron Shiri, Anand Sivaramakrishnan, Ana-Maria Valenzuela, Neil Zimmerman

Proceedings Volume 11117, 111171Y (2019) https://doi.org/10.1117/12.2530299

KEYWORDS: Telescopes, Deformable mirrors, Imaging systems, Wavefronts, Wavefront sensors, Coronagraphy, Cameras, Ultraviolet telescopes, Image segmentation, Space telescopes

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

Effects and mitigation of polarization aberrations in LUVOIR coronagraph

Scott Will, James Fienup

Proceedings Volume 11117, 1111710 (2019) https://doi.org/10.1117/12.2525377

KEYWORDS: Coronagraphy, Polarization, Wavefronts, Telescopes, Diffraction, Wavefront aberrations, Wavefront compensation, Adaptive optics

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Showing 5 of 22 publications

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