Dr. Iva Laginja Profile

Dr. Iva Laginja

Postdoctoral Research Associate at LESIA

SPIE Involvement:

Author

Publications (47)

SPIE Journal Paper | 25 October 2024 Open Access

Open Access

Exoplanet detection techniques for direct imaging dark zone maintenance datasets

Susan Redmond, Laurent Pueyo, Emiel Por, Raphaël Pourcelot, Iva Laginja, Bryony Nickson, Ananya Sahoo, Meiji Nguyen, N. Jeremy Kasdin, Marshall Perrin, Rémi Soummer, Leonid Pogorelyuk

JATIS, Vol. 10, Issue 04, 049003, (October 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.4.049003

KEYWORDS: Planets, Signal to noise ratio, Point spread functions, Exoplanetary science, Stars, Coherence imaging, Telescopes, Electric fields, Coronagraphy, Optical coherence

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Proceedings Article | 23 August 2024 Paper

Paper

A deep reinforcement learning approach to wavefront control for exoplanet imaging

Yann Gutierrez, Johan Mazoyer, Olivier Herscovici-Schiller, Laurent Mugnier, Baptiste Abeloos, Iva Laginja

Proceedings Volume 13092, 130926H (2024) https://doi.org/10.1117/12.3020374

KEYWORDS: Machine learning, Wavefronts, Coronagraphy, Wavefront aberrations, Exoplanets, Signal to noise ratio, Aberration correction, Wavefront errors, Sensors

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Proceedings Article | 23 August 2024 Paper

Paper

Polarization effects on high contrast imaging: measurements on THD2 bench

Pierre Baudoz, Celia Desgrange, Raphaël Galicher, Iva Laginja

Proceedings Volume 13092, 130926L (2024) https://doi.org/10.1117/12.3020010

KEYWORDS: Polarization, Coronagraphy, Mirrors, Reflection, Polarizers, Parabolic mirrors, Astronomical instrumentation, High dynamic range imaging, Exoplanets

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

Mid-order wavefront control for exoplanet imaging: preliminary characterization of the segmented deformable mirror and Zernike wavefront sensor on HiCAT

Benjamin Buralli, Mamadou N'Diaye, Raphaël Pourcelot, Marcel Carbillet, Emiel Por, Iva Laginja, Ludovic Canas, Sarah Steiger, Peter Petrone, Meiji Nguyen, Bryony Nickson, Susan Redmond, Ananya Sahoo, Laurent Pueyo, Marshall Perrin, Rémi Soummer

Proceedings Volume 13092, 1309268 (2024) https://doi.org/10.1117/12.3018900

KEYWORDS: Signal to noise ratio, Wavefront sensors, Wavefront errors, Telescopes, Wavefronts, Deformable mirrors, Mirrors, Actuators, Sensors

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Proceedings Article | 23 August 2024 Presentation + Paper

Presentation + Paper

Prototyping liquid-crystal coronagraphs for exo-Earth imaging

Iva Laginja, David Doelman, Frans Snik, Pierre Baudoz, Felix Bettonvil, Jeroen H. Rietjens, Chris van Dijk, Kristien Peeters, Alexander Eigenraam, Erin Pougheon, Thomas van der Wielen, Marco Esposito, Thomas Wijnen, Mariya Krasteva, Matteo Taccola

Proceedings Volume 13092, 1309227 (2024) https://doi.org/10.1117/12.3016774

KEYWORDS: Coronagraphy, Polarization, Polarization gratings, Liquid crystals, Manufacturing, Diffraction gratings, Polarized light, Exoplanets

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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 Presentation + Paper

Presentation + Paper

Achieved maturation of key component-level technologies to enable large, segmented apertures in an ultra-stable optical architecture

Laura Coyle, Tyler McCracken, Laurent Pueyo, Remi Soummer, Matthew East, Jonathan Arenberg, Bob Hellekson, Todd Lawton, Marcel Bluth, James Tucker, Sang Park, Michael Eisenhower, Benjamin Cromey, Jeremy Shugrue, Joseph Ho, Jake Crouse, Alex Klein, Dustin Putnam, Brian Hicks, Randy Abbott, Bruce Hardy, Ananya Sahoo, Iva Laginja, Sean Brennan, Colin Kingsley, Vincent Tagliamonti, Vera Versteeg, David Stewart, Laurie Hill, Michael Lesczynski, Sze Chaung

Proceedings Volume 13092, 130921K (2024) https://doi.org/10.1117/12.3014539

KEYWORDS: Mirrors, Control systems, Design, Coronagraphy, Sensors, Telescopes, Optical surfaces, Deformation, Simulations, Wavefront errors

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

A parameter scan of dark zone maintenance for high-contrast imaging of exoplanets using theoretical and experimental implementations

Saikrishna Manojkumar, Christine Page, Leonid Pogorelyuk, Susan Redmond, Ajay Gill, Laurent Pueyo, Emiel Por, Iva Laginja, Raphael Pourcelot, Bryony Nickson, Ananya Sahoo, Meiji Nguyen, Rémi Soummer, Marshall Perrin, Bijan Nemati, Kerri Cahoy, Jeremy Kasdin

Proceedings Volume 13092, 1309269 (2024) https://doi.org/10.1117/12.3019008

KEYWORDS: Wavefronts, Wavefront sensors, Coronagraphy, Simulations, Electric fields, Cameras, Space telescopes, Signal to noise ratio, Exoplanets, Stars, Equipment, Imaging systems

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Proceedings Article | 23 August 2024 Presentation + Paper

Presentation + Paper

Simulated performance of energy-resolving detectors towards exoplanet imaging with the Habitable Worlds Observatory

Sarah Steiger, Laurent Pueyo, Emiel Por, Pin Chen, Rémi Soummer, Raphaël Pourcelot, Iva Laginja, Vanessa Bailey

Proceedings Volume 13092, 130921W (2024) https://doi.org/10.1117/12.3020603

KEYWORDS: Electron multiplying charge coupled devices, Sensors, Observatories, Superconductors, Simulations, Coronagraphy

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

ESCAPE project: testing active observing strategies for high-contrast imaging in space on the HiCAT testbed

Alexis Lau, Élodie Choquet, Lisa Altinier, Iva Laginja, Rémi Soummer, Laurent Pueyo, Nicolas Godoy, Arthur Vigan, David Mary

Proceedings Volume 13092, 130926J (2024) https://doi.org/10.1117/12.3019666

KEYWORDS: Coronagraphy, Point spread functions, Wavefronts, Space telescopes, Telescopes

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Proceedings Article | 23 August 2024 Presentation + Paper

Presentation + Paper

Exoplanet detection techniques for direct imaging dark zone maintenance data sets

Susan Redmond, Laurent Pueyo, Emiel Por, Raphaël Pourcelot, Iva Laginja, Bryony Nickson, Ananya Sahoo, Meiji Nguyen, N. Jeremy Kasdin, Marshall Perrin, Rémi Soummer, Leonid Pogorelyuk

Proceedings Volume 13092, 1309224 (2024) https://doi.org/10.1117/12.3015089

KEYWORDS: Planets, Signal to noise ratio, Telescopes, Coherence imaging, Point spread functions, Optical coherence, Histograms, Coronagraphy, Stars, Wavefronts

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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 Poster

Poster

Harvesting lost photons in stellar coronagraphs

Lisa Altinier, Yann Gutierrez, Olivier Absil, Alexis Carlotti, Olivier Herscovici-Schiller, Lucie Leboulleux, Emiel Por, Pierre Baudoz, Alexis Bidot, Kimberly Bott, Bernhard Brandl, Sarah Casewell, Élodie Choquet, Nicolas Cowan, Niyati Desai, David Doelman, Jules Fowler, Timothy Gebhard, Sebastiaan Haffert, Adrien Hours, Roser Juanola-Parramon, Matthew Kenworthy, Elina Kleisioti, Lorenzo König, Mariya Krasteva, Iva Laginja, Rico Landman, Johan Mazoyers, Maxwell Millar-Blanchaer, David Mouillet, Mamadou N'Diaye, Frans Snik, Dirk van Dam, Kyle Van Gorkom, Maaike van Kooten, Sophia Vaughan, Arthur Vigan

Proceedings Volume 12680, 126801T (2023) https://doi.org/10.1117/12.2677410

KEYWORDS: Coronagraphy, Photons, Exoplanets, Stars, Wavefront sensors, Reflection, Pupil aberrations, Large telescopes, Cameras, Calibration

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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 | 6 October 2023 Presentation

Presentation

Broadband performance of the PAPLC coronagraph on the HiCAT testbed

Emiel Por, Raphaël Pourcelot, Ananya Sahoo, Meiji Nguyen, Bryony Nickson, Alex Klein, Peter Petrone, Iva Laginja, Laurent Pueyo, Rémi Soummer

Proceedings Volume 12680, 126801D (2023) https://doi.org/10.1117/12.2677757

KEYWORDS: Coronagraphy, Wavefront sensors, Wavefront aberrations, Telescopes, Spatial frequencies, Observatories, Wavefronts, Pupil aberrations, Point spread functions, Mirrors

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Integrated photonic-based coronagraphic systems for future space telescopes

Niyati Desai, Lorenzo König, Emiel Por, Roser Juanola-Parramon, Ruslan Belikov, Iva Laginja, Olivier Guyon, Laurent Pueyo, Kevin Fogarty, Olivier Absil, Lisa Altinier, Pierre Baudoz, Alexis Bidot, Markus Johannes Bonse, Kimberly Bott, Bernhard Brandl, Alexis Carlotti, Sarah Casewell, Elodie Choquet, Nicolas Cowan, David Doelman, J. Fowler, Timothy Gebhard, Yann Gutierrez, Sebastiaan Haffert, Olivier Herscovici-Schiller, Adrien Hours, Matthew Kenworthy, Elina Kleisioti, Mariya Krasteva, Rico Landman, Lucie Leboulleux, Johan Mazoyer, Maxwell Millar-Blanchaer, David Mouillet, Mamadou N'Diaye, Frans Snik, Dirk van Dam, Kyle van Gorkom, Maaike van Kooten, Sophia Vaughan

Proceedings Volume 12680, 126801S (2023) https://doi.org/10.1117/12.2677210

KEYWORDS: Coronagraphy, Planets, Yield improvement, Space telescopes, Exoplanets, Telescopes, Tolerancing, System integration, Physics, Equipment

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Proceedings Article | 5 October 2023 Paper

Paper

Visible extreme adaptive optics on extremely large telescopes: towards detecting oxygen in Proxima Centauri b and analogs

J. Fowler, Sebastiaan Haffert, Maaike A. M. van Kooten, Rico Landman, Alexis Bidot, Adrien Hours, Mamadou N'Diaye, Olivier Absil, Lisa Altinier, Pierre Baudoz, Ruslan Belikov, Markus Johannes Bonse, Kimberly Bott, Bernhard Brandl, Alexis Carlotti, Sarah Casewell, Elodie Choquet, Nicolas Cowan, Niyati Desai, David Doelman, Kevin Fogarty, Timothy Gebhard, Yann Gutierrez, Olivier Guyon, Olivier Herscovici-Schiller, Roser Juanola-Parramon, Matthew Kenworthy, Elina Kleisioti, Lorenzo König, Mariya Krasteva, Iva Laginja, Lucie Leboulleux, Johan Mazoyer, Maxwell Millar-Blanchaer, David Mouillet, Emiel Por, Laurent Pueyo, Frans Snik, Dirk van Dam, Kyle van Gorkom, Sophia Vaughan

Proceedings Volume 12680, 126801U (2023) https://doi.org/10.1117/12.2677503

KEYWORDS: Wavefront errors, Adaptive optics, Wavefront sensors, Oxygen, Planets, Equipment, Stars, Coronagraphy, Telescopes, Large telescopes

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Differential optical transfer function wavefront sensing and pupil calibration with the HiCAT testbed

Meiji Nguyen, Emiel Por, Ananya Sahoo, Rémi Soummer, Raphaël Pourcelot, Bryony Nickson, Laurent Pueyo, Marshall Perrin, Iva Laginja

Proceedings Volume 12680, 126802H (2023) https://doi.org/10.1117/12.2677756

KEYWORDS: Calibration, Actuators, Optical transfer functions, Cameras, Point spread functions, Phase retrieval, Wavefronts, Pupil aberrations, Fourier transforms, Wavefront aberrations, Segmented mirrors, Wavefront reconstruction, Coronagraphy, Aberration correction

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SPIE Journal Paper | 25 October 2022

Coronagraphic detection of Earth-like planets with large, actively controlled space telescopes

Laurent Pueyo, Roser Juanola-Parramon, Jason Tumlinson, Rémi Soummer, Iva Laginja, Heidi Hammel, C. Mattias Mountain

JATIS, Vol. 8, Issue 04, 049002, (October 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.4.049002

KEYWORDS: Coronagraphy, Telescopes, Wavefront sensors, Wavefronts, Space telescopes, Planets, Stars, James Webb Space Telescope, Mirrors, Exoplanets

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We explore the capabilities of large segmented telescopes with active and adaptive optics, with a particular focus on a system view, which includes use of approaches that are routine for current large ground-based telescopes. Using a physically motivated order-of-magnitude model, we show that continuous control of telescope misalignments using adjustable optics in an exoplanet imaging instrument significantly relaxes stability requirements for the entire observatory. We start with the recent analysis by Nemati et al., (2020, JATIS 6, id. 039002), which asserts that small monolithic mirrors have an engineering advantage over larger segmented mirrors when it comes to obtaining images stable enough for direct exoplanet imaging and characterization, i.e., picometer stability. When we fold these results into our model of closed-loop operations and properly partition engineering challenges by optimizing error budget allocations, we find that even for the most sensitive modes, allowable drifts are actually of the order of nanometer over an hour, well within easily engineered tolerances. While this order-of-magnitude analysis does not include full end-to-end modeling or proper engineering margins, it showcases the importance of considering continuous wavefront sensing and control when discussing the feasibility of future exoplanet missions. We also quantify how large segmented architectures, in spite of appearing more complex at the observatory level, facilitate closed-loop operations due to their large photon collection abilities. We place our work in the context of larger discussions on aperture size that highlight a more fundamental challenge: the deeper uncertainties in performance of an exo-earth characterizing telescope primarily reside in our knowledge of the frequency of exo-earths; the effects of geological age on the resulting atmospheres; and, most importantly, on the likelihood of detectable life arising on such planets. A mission that sets out to establish whether we are alone among the nearby stars must adopt a mission architecture that is resilient against such intrinsic uncertainties: uncertainties that only direct observations can resolve. Large apertures enabled by segmented telescope designs historically have demonstrated such resilience.

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 | 30 August 2022 Poster + Paper

Poster + Paper

Connecting the astronomical testbed community - the CAOTIC project: optimized teaching methods for software version control concepts

Iva Laginja, Pablo Robles, Kevin Barjot, Lucie Leboulleux, Rebecca Jensen-Clem, Keira Brooks, Christopher Moriarty

Proceedings Volume 12185, 121853A (2022) https://doi.org/10.1117/12.2629483

KEYWORDS: Astronomy, Software development, Adaptive optics, Computer programming, Astronomical instrumentation, Control systems, Computer programming languages, Wavefront sensors, Software engineering, Imaging systems

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Proceedings Article | 29 August 2022 Presentation

Presentation

Architecture trades to optimize wavefront stability requirements for exoplanet imaging in space.

Laurent Pueyo, Leonid Pogorelyuk, Iva Laginja, Remi Soummer, Ananya Sahoo, Emiel Por, Kerri Cahoy, Laura Coyle, Scott Knight

Proceedings Volume 12180, 121802J (2022) https://doi.org/10.1117/12.2630757

KEYWORDS: Wavefronts, Coronagraphy, Exoplanets, Wavefront sensors, Observatories, Wave propagation, Spatial frequencies, Photons, Error analysis, Aerospace engineering

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Proceedings Article | 27 August 2022 Poster + Paper

Poster + Paper

APLC-optimization: an apodized pupil Lyot coronagraph design survey toolkit

Bryony Nickson, Emiel Por, Meiji Nguyen, Rémi Soummer, Iva Laginja, Ananya Sahoo, Laurent Pueyo, Katheryn St. Laurent, Mamadou N’Diaye, Neil Zimmerman, James Noss, Marshall Perrin

Proceedings Volume 12180, 121805K (2022) https://doi.org/10.1117/12.2630686

KEYWORDS: Apodization, Exoplanets, Optical design software, Optimization (mathematics), Design and modelling, Coronagraphy, Telescopes, Tolerancing, Image segmentation, Optical instrument design, Gemini Planet Imager, Point spread functions, Error analysis, Space telescopes, Software development

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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 | 27 August 2022 Presentation + Paper

Presentation + Paper

Dark zone maintenance for future coronagraphic space missions

Susan Redmond, Laurent Pueyo, Leonid Pogorelyuk, Emiel Por, James Noss, Keira Brooks, Iva Laginja, Marshall Perrin, Rémi Soummer, N. Jeremy Kasdin

Proceedings Volume 12180, 121802B (2022) https://doi.org/10.1117/12.2630682

KEYWORDS: Signal to noise ratio, Photons, Coronagraphy, Exoplanets, Electron multiplying charge coupled devices, Wavefronts, Space telescopes, Space operations

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Proceedings Article | 27 August 2022 Paper

Paper

Segment-level thermal sensitivity analysis for exo-Earth imaging

Ananya Sahoo, Iva Laginja, Laurent Pueyo, Rémi Soummer, Laura Coyle, J. Scott Knight, Matthew East

Proceedings Volume 12180, 121805V (2022) https://doi.org/10.1117/12.2630592

KEYWORDS: Wavefronts, Tolerancing, Coronagraphy, Image segmentation, Wavefront sensors, Mirrors, Error analysis, Wavefront aberrations, Wave propagation, Stars

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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 | 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 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

Dark zone maintenance results for segmented aperture wavefront error drift in a high contrast space coronagraph

Susan Redmond, Laurent Pueyo, Leonid Pogorelyuk, Emiel Por, James Noss, Iva Laginja, Keira Brooks, Marshall Perrin, Rémi Soummer, Jeremy Kasdin

Proceedings Volume 11823, 118231K (2021) https://doi.org/10.1117/12.2594647

KEYWORDS: Coronagraphy, Wavefronts, Space telescopes, Planets, Telescopes, Stars, Point spread functions

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Proceedings Article | 6 August 2021 Presentation

Presentation

Fundamental limits of high contrast imaging with continuous WFS&C control in space.

Laurent Pueyo, Leonid Pogorelyuk, Iva Laginja, Remi Soummer, Ananya Sahoo, Laura Coyle, Scott Knight, Kerri Cahoy

Proceedings Volume 11823, 118231I (2021) https://doi.org/10.1117/12.2594955

KEYWORDS: Wavefronts, Wavefront sensors, Observatories, Image segmentation, Wave propagation, Telescopes, Systems modeling, Imaging systems, Coronagraphy, Stars

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We explore the high contrast capabilities of large segmented telescopes with Active and Adaptive Optics, with particular focus on a system view, which includes use of approaches that are routine for current large ground-based telescopes. These approaches include continuous Wavefront Sensing and control (WFS&C), and proper partitioning of engineering challenges by optimizing the error budget allocations. We present a methodology to compute wavefront stability requirements in the presence of temporal variations of the observatory optical errors at all spatial scales: global low order aberrations, segment to segment misalignments and high spatial frequencies. We start by deriving the sensitivity of the starlight suppression of a coronagraph instrument (e.g. the relationship between contrast and wavefront variance) for each family of spatial modes. We then propagate open loop wavefronts variances, alongside with the actual photons carrying the information associated with these misalignments, through diffractive linear wavefront sensor models. We calculate the Fisher information of measurements using those. That quantity is then used in the context of a Cramer-Rao bound to evaluate closed loop residuals, which are then propagated through coronagraph models to yield contrast fundamental limits. Working under the assumption that such WFS&C systems will be limited by the information content bottleneck due to the finite magnitude of a natural guide star, we use results from these calculations to quantify observatory requirements for a variety of exoplanet imaging missions. We highlight the similarities and differences between monolithic and segmented architectures, and show that the often-cited need for picometer stability is no longer required for the latter across the full aperture, but rather within combinations of segments. We also consider both the case of batch and recursive wavefront estimators (that take into account the entire sensing history) and make the case for significantly less challenging observatory requirements when the latter class of algorithms is implemented.

Proceedings Article | 4 August 2021 Presentation

Presentation

Experimental validation of the Phase-Apodized-Pupil Lyot Coronagraph on a segmented telescope pupil

Emiel Por, Remi Soummer, Laurent Pueyo, Iva Laginja

Proceedings Volume 11823, 118230U (2021) https://doi.org/10.1117/12.2594952

KEYWORDS: Coronagraphy, Telescopes, Image segmentation, Cameras, Wavefront sensors, Target acquisition, Phase retrieval, Optical filters, Numerical simulations, Imaging systems

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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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Proceedings Article | 1 August 2021 Presentation

Presentation

LUVOIR A Segment level thermo-mechanical stability requirements

Ananya Sahoo, Iva Laginja, Laurent Pueyo, Remi Soummer, Laura Coyle, J. Scott Knight, Matthew East

Proceedings Volume 11823, 118231N (2021) https://doi.org/10.1117/12.2594636

KEYWORDS: Wavefronts, Wavefront sensors, Wave propagation, Sensors, Observatories, Mirrors, Finite element methods, Reflectivity, Laser metrology, Instrument modeling

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SPIE Journal Paper | 30 March 2021 Open Access

Open Access

Analytical tolerancing of segmented telescope co-phasing for exo-Earth high-contrast imaging

Iva Laginja, Rémi Soummer, Laurent Mugnier, Laurent Pueyo, Jean-François Sauvage, Lucie Leboulleux, Laura Coyle, J. Scott Knight

JATIS, Vol. 7, Issue 01, 015004, (March 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.015004

KEYWORDS: Image segmentation, Coronagraphy, Tolerancing, Telescopes, Statistical analysis, Device simulation, Error analysis, Wavefronts, Observatories, Mirrors

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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 + Paper

Poster + Paper

First error budget of a deployable CubeSat telescope

J.-F. Sauvage, N. Schwartz, S. Vievard, A. Bonnefois, M.-T. Velluet, C. Correia, F. Cassaing, T. Fusco, V. Michau, J.-C. Krapez, M. Ferrari, I. Laginja

Proceedings Volume 11443, 1144330 (2020) https://doi.org/10.1117/12.2561697

KEYWORDS: Telescopes, Image segmentation, Image resolution, Diffraction, Temporal resolution, Spatial resolution, Satellites, Mirrors, Imaging systems, Optical resolution

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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 | 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 | 9 September 2019 Presentation + Paper

Presentation + Paper

Phase-retrieval-based wavefront metrology for high-contrast coronography: 2. Reconstructions through a shaped pupil apodizer

Gregory Brady, Peter Petrone, Iva Laginja, Keira Brooks, Manxuan (Rebecca) Zhang, Mamadou N'Diaye, Christopher Moriarty, John Hagopian, Rémi Soummer

Proceedings Volume 11117, 1111712 (2019) https://doi.org/10.1117/12.2530482

KEYWORDS: Wavefronts, Wavefront metrology, Phase retrieval, Coronagraphy, Manufacturing, Exoplanets, Binary data, Imaging systems, Phase measurement, Deformable mirrors

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

Wavefront error tolerancing for direct imaging of exo-Earths with a large segmented telescope in space

Iva Laginja, Lucie Leboulleux, Laurent Pueyo, Rémi Soummer, Jean-François Sauvage, Laurent Mugnier, Laura Coyle, J. Scott Knight, Kathryn St. Laurent, Emiel Por, James Noss

Proceedings Volume 11117, 1111717 (2019) https://doi.org/10.1117/12.2530300

KEYWORDS: Space telescopes, Wavefronts, Image segmentation, Telescopes, Coronagraphy, Instrument modeling, Planets, Space operations, Wavefront sensors, Computer simulations

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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 | 21 August 2018 Paper

Paper

James Webb Space Telescope optical simulation testbed V: wide-field phase retrieval assessment

Iva Laginja, Greg Brady, Rémi Soummer, Sylvain Egron, Christopher Moriarty, Charles-Philippe Lajoie, Aurélie Bonnefois, Vincent Michau, Élodie Choquet, Marc Ferrari, Lucie Leboulleux, Olivier Levecq, Mamadou N'Diaye, Marshall Perrin, Peter Petrone, Laurent Pueyo, Anand Sivaramakrishnan

Proceedings Volume 10698, 106983N (2018) https://doi.org/10.1117/12.2313892

KEYWORDS: Wavefronts, James Webb Space Telescope, Monochromatic aberrations, Point spread functions, Wavefront sensors, Mirrors, Cameras, Space telescopes, Telescopes, Phase retrieval

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Proceedings Article | 21 August 2018 Presentation + Paper

Presentation + Paper

High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront control

Rémi Soummer, Gregory Brady, Keira Brooks, Thomas Comeau, Élodie Choquet, Tom Dillon, Sylvain Egron, Rob Gontrum, John Hagopian, Iva Laginja, Lucie Leboulleux, Marshall Perrin, Peter Petrone, Laurent Pueyo, Johan Mazoyer, Mamadou N'Diaye, A. J. Eldorado Riggs, Ron Shiri, Anand Sivaramakrishnan, Kathryn St. Laurent, Ana-Maria Valenzuela, Neil Zimmerman

Proceedings Volume 10698, 106981O (2018) https://doi.org/10.1117/12.2314110

KEYWORDS: Coronagraphy, Space telescopes, Wavefronts, Telescopes, Metrology, Phase retrieval, Carbon nanotubes

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Segmented telescopes are a possible approach to enable large-aperture space telescopes for the direct imaging and spectroscopy of habitable worlds. However, the increased complexity of their aperture geometry, due to the central obstruction, support structures and segment gaps, makes high-contrast imaging very challenging. The High-contrast imager for Complex Aperture Telescopes (HiCAT) testbed was designed to study and develop solutions for such telescope pupils using wavefront control and coronagraphic starlight suppression. The testbed design has the flexibility to enable studies with increasing complexity for telescope aperture geometries starting with off-axis telescopes, then on-axis telescopes with central obstruction and support structures - e.g. the Wide Field Infrared Survey Telescope (WFIRST) - up to on-axis segmented telescopes, including various concepts for a Large UV, Optical, IR telescope (LUVOIR). In the past year, HiCAT has made significant hardware and software updates in order to accelerate the development of the project. In addition to completely overhauling the software that runs the testbed, we have completed several hardware upgrades, including the second and third deformable mirror, and the first custom Apodized Pupil Lyot Coronagraph (APLC) optimized for the HiCAT aperture, which is similar to one of the possible geometries considered for LUVOIR. The testbed also includes several external metrology features for rapid replacement of parts, and in particular the ability to test multiple apodizers readily, an active tip-tilt control system to compensate for local vibration and air turbulence in the enclosure. On the software and operations side, the software infrastructure enables 24/7 automated experiments that include routine calibration tasks and high-contrast experiments. In this communication we present an overview and status update of the project, both on the hardware and software side, and describe the results obtained with APLC wavefront control.

Proceedings Article | 24 July 2018 Paper

Paper

Phase-retrieval-based wavefront metrology for high contrast coronagraphy

Gregory Brady, Christopher Moriarty, Peter Petrone, Iva Laginja, Keira Brooks, Tom Comeau, Lucie Leboulleux, Rémi Soummer

Proceedings Volume 10698, 106986I (2018) https://doi.org/10.1117/12.2314368

KEYWORDS: Optical metrology, In situ metrology, Wavefront sensors, Wavefront metrology, Wavefront reconstruction, Wavefronts, Phase retrieval, Coronagraphy, Calibration, Mirrors, Deformable mirrors, Telescopes

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Showing 5 of 47 publications

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