Dr. Ananya Sahoo Profile

Dr. Ananya Sahoo

Staff Scientist at Space Telescope Science Institute

SPIE Involvement:

Author

Publications (35)

Proceedings Article | 24 August 2024 Poster

Poster

Optimizing NIRCam coronagraphy: performance and science operations

Julien Girard, Mario Gennaro, Armin Rest, Jarron Leisenring, Bryan Hilbert, Alicia Canipe, Martha Boyer, David Golimowski, Tony Sohn, Ananya Sahoo, Ben Sunnquist, Brian Brooks, Anton Koekemoer, Vera Kozhurina-Platais, Justin Pierel, Aarynn Carter, John Stansberry, Marshall Perrin, Laurent Pueyo, William Balmer, Jens Kammerer, Kellen Lawson, Ell Bogat, Jason Wang, Marcia Rieke

Proceedings Volume 13092, 1309251 (2024) https://doi.org/10.1117/12.3020243

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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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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

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

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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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 | 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

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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Proceedings Article | 5 October 2023 Presentation

Presentation

Continued maturation of enabling component-level technologies for large, segmented ultra-stable telescopes

Laura Coyle, John Knight, Laurent Pueyo, Matthew East, Bob Hellekson, Jonathan Arenberg, Marcel Bluth, Sang Park, James Tucker, Brian Hicks, Benjamin Cromey, Jeremy Shugrue, Rémi Soummer, Ananya Sahoo, Sean Brennan, Todd Lawton, Michael Eisenhower

Proceedings Volume 12676, 1267602 (2023) https://doi.org/10.1117/12.2676053

KEYWORDS: Telescopes, Sensors, Analytical research, Actuators, Wavefronts, Simulations, Observatories, Mirror structures, Metrology, Large telescopes

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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 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 | 27 August 2022 Presentation + Paper

Presentation + Paper

Achieved technology maturation of key component-level technologies for ultra-stable optical systems

Laura Coyle, J. Scott Knight, Laurent Pueyo, Matthew East, Robert Hellekson, Marcel Bluth, Sang Park, James Tucker, Brian Hicks, Benjamin Cromey, Ananya Sahoo, Remi Soummer, Sean Brennan, Todd Lawton, Jonathan Arenberg, Michael Eisenhower

Proceedings Volume 12180, 121802K (2022) https://doi.org/10.1117/12.2627057

KEYWORDS: Control systems, Mirrors, Telescopes, Sensors, Coronagraphy, Metrology, Composites, Actuators, Active sensors

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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 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 | 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 | 24 August 2021 Presentation + Paper

Presentation + Paper

Technology maturation of key component-level technologies for ultra-stable optical systems

Laura Coyle, J. Scott Knight, Laurent Pueyo, Matthew East, Robert Hellekson, Marcel Bluth, Sang Park, Brian Hicks, Benjamin Cromey, Ananya Sahoo, Sean Brennan, Todd Lawton, Michael Eisenhower, James Tucker, Jonathan Arenberg

Proceedings Volume 11820, 118200C (2021) https://doi.org/10.1117/12.2594643

KEYWORDS: Mirrors, Sensors, Control systems, Metrology, Coronagraphy, Distortion, Actuators, Composites, Thermal sensing, Observatories

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Proceedings Article | 9 August 2021 Presentation + Paper

Presentation + Paper

Full characterization of the instrumental polarization effects of the spectropolarimetric mode of SCExAO/CHARIS

Joost G. J. 't Hart, Rob G. van Holstein, Steven Bos, Jasper Ruigrok, Frans Snik, Julien Lozi, Olivier Guyon, Tomoyuki Kudo, Jin Zhang, Nemanja Jovanovic, Barnaby Norris, Marc-Antoine Martinod, Tyler D. Groff, Jeffrey Chilcote, Thayne Currie, Motohide Tamura, Sébastien Vievard, Ananya Sahoo, Vincent Deo, Kyohoon Ahn, Frantz Martinache, Jeremy Kasdin

Proceedings Volume 11833, 118330O (2021) https://doi.org/10.1117/12.2602859

KEYWORDS: Polarization, Mirrors, Telescopes, Calibration, Polarimetry, Data modeling, Refractive index, Polarizers, Instrument modeling

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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

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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Proceedings Article | 21 December 2020 Poster + Paper

Poster + Paper

Extremely high-contrast, high spectral resolution spectrometer REACH for the Subaru Telescope

T. Kotani, H. Kawahara, M. Ishizuka, N. Jovanovic, S. Vievard, J. Lozi, A. Sahoo, O. Guyon, K. Yoneta, M. Tamura

Proceedings Volume 11448, 1144878 (2020) https://doi.org/10.1117/12.2561755

KEYWORDS: Spectral resolution, Telescopes, Single mode fibers, Adaptive optics, Speckle, Spectrographs, Atmospheric optics, Infrared telescopes, Coronagraphy, Near infrared

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Poster + Presentation + Paper

On-sky performance and recent results from the Subaru coronagraphic extreme adaptive optics system

Thayne Currie, Olivier Guyon, Julien Lozi, Ananya Sahoo, Sebastien Vievard, Vincent Deo, Jeffrey Chilcote, Tyler Groff, Timothy Brandt, Kellen Lawson, Nour Skaf, Frantz Martinache, N. Jeremy Kasdin

Proceedings Volume 11448, 114487H (2020) https://doi.org/10.1117/12.2576349

KEYWORDS: Adaptive optics, Coronagraphy, Stars, Planets, Exoplanets, Telescopes, Speckle, Polarimetry, Optical spheres, Gemini Planet Imager

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Proceedings Article | 13 December 2020 Presentation

Presentation

On-sky results of focal-plane wavefront sensing and control with the asymmetric pupil vector-apodizing phase plate coronagraph

Steven Bos, Kelsey Miller, Julien Lozi, Olivier Guyon, Vikram Radhakrishnan, Emiel Por, Christoph Keller, David Doelman, Sebastien Vievard, Ananya Sahoo, Vincent Deo, Thayne Currie, Nemanja Jovanovic, Frantz Martinache, Matthew Kenworthy, Frans Snik

Proceedings Volume 11448, 1144818 (2020) https://doi.org/10.1117/12.2562294

KEYWORDS: Wavefront sensors, Coronagraphy, Model-based design, Wavefronts, Point spread functions, Coherence imaging, Exoplanets, Colorimetry, Sensors, Detection and tracking algorithms

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Calibration of the instrumental polarization effects of SCExAO-CHARIS’ spectropolarimetric mode

Rob van Holstein, Steven Bos, Jasper Ruigrok, Julien Lozi, Olivier Guyon, Barnaby Norris, Frans Snik, Jeffrey Chilcote, Thayne Currie, Tyler Groff, Joost 't Hart, Nemanja Jovanovic, Jeremy Kasdin, Tomoyuki Kudo, Frantz Martinache, Ben Mazin, Ananya Sahoo, Motohide Tamura, Sébastien Vievard, Alex Walter, Jin Zhang

Proceedings Volume 11447, 114475B (2020) https://doi.org/10.1117/12.2576188

KEYWORDS: Polarization, Calibration, Telescopes, Polarimetry, Visible radiation, Stars, Spectrographs, Quartz, Prisms, Magnesium fluoride

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Status of the SCExAO instrument: recent technology upgrades and path to a system-level demonstrator for PSI

Julien Lozi, Olivier Guyon, Sébastien Vievard, Ananya Sahoo, Vincent Deo, Nemanja Jovanovic, Barnaby Norris, Marc-Antoine Martinod, Ben Mazin, Alex Walter, Neelay Fruitwala, Sarah Steiger, Kristina Davis, Peter Tuthill, Tomoyuki Kudo, Hajime Kawahara, Takayuki Kotani, Michael Ireland, Theodoros Anagnos, Chrstian Schwab, Nick Cvetojevic, Elsa Huby, Sylvestre Lacour, Kevin Barjot, Tyler Groff, Jeffrey Chilcote, Jeremy Kasdin, Frantz Martinache, Romain Laugier, Mamadou N'Diaye, Justin Knight, Jared Males, Steven Bos, Frans Snik, David Doelman, Kelsey Miller, Eduardo Bendek, Ruslan Belikov, Eugene Pluzhnik, Thayne Currie, Masayuki Kuzuhara, Taichi Uyama, Jun Nishikawa, Naoshi Murakami, Jun Hashimoto, Yosuke Minowa, Christophe Clergeon, Yoshito Ono, Naruhisa Takato, Motohide Tamura, Hideki Takami, Masa Hayashi

Proceedings Volume 11448, 114480N (2020) https://doi.org/10.1117/12.2562832

KEYWORDS: Imaging systems, Telescopes, Infrared sensors, Infrared imaging, Coronagraphy, Wavefront sensors, Sensors, Detection and tracking algorithms, Cameras, Wavefronts

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Constraining orbits and masses of stellar companions with SCExAO imaging and REACH spectroscopy

Ananya Sahoo, Julien Lozi, Sebastien Vievard, Olivier Guyon, Takayuki Kotani, Hajime Kawahara, Nemanja Jovanovic, Vincent Deo, Masato Ishizuka

Proceedings Volume 11448, 1144809 (2020) https://doi.org/10.1117/12.2563133

KEYWORDS: Stars, Imaging systems, Satellite imaging, Satellites, Deformable mirrors, Modulation, Atmospheric optics, Imaging spectroscopy, Velocity measurements, Spectroscopy

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Focal plane wavefront sensing on SUBARU/SCExAO

S. Vievard, S. Bos, F. Cassaing, T. Currie, V. Deo, O. Guyon, N. Jovanovic, C. Keller, M. Lamb, C. Lopez, J. Lozi, F. Martinache, K. Miller, A. Montmerle-Bonnefois, L. Mugnier, M. N'Diaye, B. Norris, A. Sahoo, J.-F. Sauvage, N. Skaf, F. Snik, M. Wilby, A. Wong

Proceedings Volume 11448, 114486D (2020) https://doi.org/10.1117/12.2562787

KEYWORDS: Wavefront sensors, Coronagraphy, Adaptive optics, Telescopes, Thermal effects, Exoplanets, Large telescopes, Spatial resolution, Sensors, Domes

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

New NIR spectro-polarimetric modes for the SCExAO instrument

Julien Lozi, Olivier Guyon, Tomoyuki Kudo, Jin Zhang, Nemanja Jovanovic, Barnaby Norris, Marc-Antoine Martinod, Tyler Groff, Jeffrey Chilcote, Motohide Tamura, Steven Bos, Frans Snik, Sébastien Vievard, Ananya Sahoo, Vincent Deo, Frantz Martinache, Jeremy Kasdin

Proceedings Volume 11448, 114487C (2020) https://doi.org/10.1117/12.2562792

KEYWORDS: Near infrared, Polarimetry, Polarization, Planets, Coronagraphy, Iterated function systems, Imaging systems, Image processing, Adaptive optics, Visible radiation

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Validating advanced wavefront control techniques on the SCExAO testbed/instrument

Olivier Guyon, Julien Lozi, Sebastien Vievard, Ruslan Belikov, Eduardo Bendek, Steven Bos, Thayne Currie, Vincent Deo, Michael Fitzgerald, Damien Gratadour, Tyler Groff, Nemanja Jovanovic, Hajime Kawahara, Takayuki Kotani, Tomoyuki Kudo, Coline Lopez, Hatem Ltaief, Jared Males, Frantz Martinache, Marc-Antoine Martinod, Benjamin Mazin, Kelsey Miller, Barnaby Norris, Mamadou Ndiaye, Eugene Pluzhnyk, Ananya Sahoo, Arnaud Sevin, Nour Skaf, Frans Snik, Motohide Tamura, Alison Wong

Proceedings Volume 11448, 114481Z (2020) https://doi.org/10.1117/12.2562723

KEYWORDS: Wavefronts, Adaptive optics, Coronagraphy, Prototyping, Sensor fusion, Cameras, Hardware testing, Multiplexing, Wavefront sensors, Reliability

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Proceedings Article | 20 September 2018 Paper

Paper

Subaru AO188 upgrade phase 1: integration of the new real-time system

Christophe Clergeon, Yosuke Minowa, Olivier Guyon, Yoshito Ono, Etsuko Mieda, Nour Skaf, Hiroshige Yoshida, Yukata Hayano, Takashi Hattori, Kiaina Schubert, Ananya Sahoo, Julien Lozi, Sebastien Vievard

Proceedings Volume 10703, 1070337 (2018) https://doi.org/10.1117/12.2314254

KEYWORDS: Adaptive optics, Avalanche photodetectors, Real-time computing, Electronics, Telescopes, Wavefront sensors, Actuators, Control systems, Human-machine interfaces, Matrices

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Proceedings Article | 13 July 2018 Paper

Paper

SCExAO, an instrument with a dual purpose: perform cutting-edge science and develop new technologies

Julien Lozi, Olivier Guyon, Nemanja Jovanovic, Sean Goebel, Prashant Pathak, Nour Skaf, Ananya Sahoo, Barnaby Norris, Frantz Martinache, Mamadou N'Diaye, Ben Mazin, Alex Walter, Peter Tuthill, Tomoyuki Kudo, Hajime Kawahara, Takayuki Kotani, Michael Ireland, Nick Cvetojevic, Elsa Huby, Sylvestre Lacour, Sébastien Vievard, Tyler Groff, Jeffrey Chilcote, Jeremy Kasdin, Justin Knight, Frans Snik, David Doelman, Yosuke Minowa, Christophe Clergeon, Naruhisa Takato, Motohide Tamura, Thayne Currie, Hideki Takami, Masa Hayashi

Proceedings Volume 10703, 1070359 (2018) https://doi.org/10.1117/12.2314282

KEYWORDS: Cameras, Coronagraphy, Polarization, Near infrared, Speckle, Exoplanets, Wavefronts, Telescopes, Infrared radiation, Polarimetry

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Proceedings Article | 11 July 2018 Paper

Paper

Subaru Coronagraphic Extreme-AO (SCExAO) wavefront control: current status and ongoing developments

Ananya Sahoo, Olivier Guyon, Christophe Clergeon, Nour Skaf, Yosuke Minowa, Julien Lozi, Nemanja Jovanovic, Frantz Martinache

Proceedings Volume 10703, 1070350 (2018) https://doi.org/10.1117/12.2314333

KEYWORDS: Wavefronts, Coronagraphy, Wavefront sensors, Speckle, Adaptive optics, Calibration, Telescopes

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