Dr. Axel Potier Profile

Dr. Axel Potier

Postdoctoral Fellow at Univ Bern

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 26 August 2024 Presentation

Active coronagraphy and coherence differential imaging in unpolarized light with the Swiss Wideband Active Testbed for Coronagraphic High-contrast imaging (SWATCHi) 2.0 (Conference Presentation)

Axel Potier, Audrey Baur, Liurong Lin, Ruben Tandon, Jonas Kühn

Proceedings Volume 13100, 131002O (2024) https://doi.org/10.1117/12.3018281

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Proceedings Article | 23 August 2024 Poster + Paper

Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct imaging

Axel Potier, A. J. Eldorado Riggs, Garreth Ruane, Phillip Poon, Matthew Noyes, Greg Allan, Alexander Walter, Camilo Mejia Prada, Raphaël Galicher, Johan Mazoyer, Pierre Baudoz

Proceedings Volume 13092, 130926E (2024) https://doi.org/10.1117/12.3018289

KEYWORDS: Coronagraphy, Exoplanets, Wavefront sensors

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Proceedings Article | 18 July 2024 Presentation + Paper

The programmable liquid-crystal active coronagraphic imager for the DAG telescope (PLACID) instrument: on-site status update ahead of first light

Jonas Kühn, Laurent Jolissaint, Audrey Baur, Liurong Lin, Axel Potier, Ruben Tandon, Derya Öztürk Çetni, Daniele Piazza, Mathias Brändli, Iljadin Manurung, Martin Rieder

Proceedings Volume 13096, 130961M (2024) https://doi.org/10.1117/12.3018830

KEYWORDS: Coronagraphy, Spatial light modulators, Telescopes, Adaptive optics, Exoplanets, Coherence imaging

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Proceedings Article | 18 July 2024 Poster + Paper

Future exoplanet direct imaging instruments: simulating spatial light modulator-based pixelated focal-plane coronagraphy

L. Lin, A. Potier, R. Tandon, J. Kühn

Proceedings Volume 13096, 130963E (2024) https://doi.org/10.1117/12.3018832

KEYWORDS: Spatial light modulators, Coronagraphy, Simulations, Equipment, Telescopes, Wavefront errors, Device simulation, Mirrors, Exoplanets, Coherence imaging

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Proceedings Article | 18 July 2024 Poster + Paper

Discovery space and science with the PLACID stellar coronagraph

Ruben Tandon, Liurong Lin, Axel Potier, Laurent Jolissaint, Audrey Baur, Derya Öztürk Çetni, Jonas Kühn

Proceedings Volume 13096, 130963F (2024) https://doi.org/10.1117/12.3018836

KEYWORDS: Coronagraphy, Equipment, Telescopes, Stars, Adaptive optics, Spatial light modulators, Exoplanets, Binary stars, Imaging systems, Observatories

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Proceedings Article | 18 July 2024 Poster + Paper

Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction

Johan Mazoyer, Charles Goulas, Fabrice Vidal, Isaac Bernardino Dinis, Julien Milli, Michel Tallon, Raphaël Galicher, Olivier Absil, Clémentine Bechet, Anthony Boccaletti, Florian Ferreira, Maud Langlois, Patrice Martinez, Laurent Mugnier, Mamadou N'diaye, Gilles Orban de Xivry, Axel Potier, Isabelle Tallon-Bosc, Arthur Vigan

Proceedings Volume 13096, 130969D (2024) https://doi.org/10.1117/12.3019921

KEYWORDS: Coronagraphy, Wavefront sensors, Adaptive optics

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SPIE Journal Paper | 18 July 2024

Comparative laboratory study of electric field conjugation algorithms

Niyati Desai, Axel Potier, Susan Redmond, Garreth Ruane, Phillip Poon, A. J. Eldorado Riggs, Matthew Noyes, Camilo Mejia Prada

JATIS, Vol. 10, Issue 03, 035001, (July 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.3.035001

KEYWORDS: Coronagraphy, Electric fields, Scalable video coding, Model based design, Wavefront sensors, Cameras, Spiral phase plates, Wavefronts, Design, Space telescopes

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Proceedings Article | 5 October 2023 Presentation + Paper

Experimental comparison of model-free and model-based dark hole algorithms for future space telescopes

Niyati Desai, Axel Potier, Garreth Ruane, Phillip Poon, A. J. Riggs, Matthew Noyes, Camilo Mejia Prada

Proceedings Volume 12680, 1268015 (2023) https://doi.org/10.1117/12.2677040

KEYWORDS: Coronagraphy, Wavefront sensors, Space telescopes, Planets

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Proceedings Article | 5 October 2023 Poster + Paper

Laboratory demonstration of the triple-grating vector vortex coronagraph

David Doelman, Mireille Ouellet, Axel Potier, Garreth Ruane, Kyle Van Gorkom, Sebastiaan Haffert, Ewan Douglas, Frans Snik

Proceedings Volume 12680, 126802C (2023) https://doi.org/10.1117/12.2677432

KEYWORDS: Coronagraphy, Polarization, Prototyping, Polarization gratings, Diffraction, Liquid crystals, Diffraction gratings

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Proceedings Article | 5 October 2023 Presentation + Paper

Experimental demonstration of spectral linear dark field control at NASA’s high contrast imaging testbeds

Phillip Poon, Axel Potier, Garreth Ruane, Alex Walter, A. J. Eldorado Riggs, Matthew Noyes, Camilo Mejia Prada, Kyohoon Ahn, Olivier Guyon

Proceedings Volume 12680, 126801G (2023) https://doi.org/10.1117/12.2677806

KEYWORDS: Coronagraphy, Calibration, Matrices, Wavefront sensors, Cameras, Actuators, Stars, Wavefronts, Wavefront errors, Singular value decomposition

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SPIE Journal Paper | 24 May 2023 Open Access

Random vibration testing of microelectromechanical deformable mirrors for space-based high-contrast imaging

Axel Potier, Camilo Mejia Prada, Garreth Ruane, Hong Tang, Wesley Baxter, Duncan Liu, A. J. Eldorado Riggs, Phillip K. Poon, Eduardo Bendek, Nick Siegler, Mary Soria, Mark Hetzel, Charlie Lam, Paul Bierden

JATIS, Vol. 9, Issue 02, 029001, (May 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.029001

KEYWORDS: Actuators, Microelectromechanical systems, Vibration, Deformation, Coronagraphy, Connectors, Inspection, Exoplanets, Deformable mirrors, Equipment

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SPIE Journal Paper | 8 April 2023

Laboratory demonstration of the wrapped staircase scalar vortex coronagraph

Niyati Desai, Garreth Ruane, Jorge Llop-Sayson, Arielle Betrou-Cantou, Axel Potier, A.J. Eldorado Riggs, Eugene Serabyn, Dimitri Mawet

JATIS, Vol. 9, Issue 02, 025001, (April 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.025001

KEYWORDS: Scalable video coding, Coronagraphy, Design and modelling, Spiral phase plates, Exoplanets, Wavefronts, Stars, Modal decomposition, Colorimetry, Polarization

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SPIE Journal Paper | 23 September 2022 Open Access

Adaptive optics performance of a simulated coronagraph instrument on a large, segmented space telescope in steady state

Axel Potier, Garreth Ruane, Chris Stark, Pin Chen, Ankur Chopra, Larry Dewell, Roser Juanola-Parramon, Alison Nordt, Laurent Pueyo, David Redding, A J Eldorado Riggs, Dan Sirbu

JATIS, Vol. 8, Issue 03, 035002, (September 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.3.035002

KEYWORDS: Adaptive optics, Coronagraphy, Telescopes, Wavefronts, Stars, Device simulation, Wavefront sensors, Equipment, Optical path differences, Wavefront errors

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Proceedings Article | 30 August 2022 Poster + Paper

Improving VLT/SPHERE without additional hardware: comparing quasi-static correction strategies

Axel Potier, Zahed Wahhaj, Raphael Galicher, Johan Mazoyer, Pierre Baudoz, Gael Chauvin, Garreth Ruane

Proceedings Volume 12185, 1218568 (2022) https://doi.org/10.1117/12.2629926

KEYWORDS: Calibration, Speckle, Coronagraphy, Optical spheres, Modulation, Coherence imaging, Wavefront sensors, Image processing, Adaptive optics, Turbulence

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Proceedings Article | 29 August 2022 Presentation + Paper

Upgrading the high contrast imaging facility SPHERE: science drivers and instrument choices

A. Boccaletti, G. Chauvin, F. Wildi, J. Milli, E. Stadler, E. Diolaiti, R. Gratton, F. Vidal, M. Loupias, M. Langlois, F. Cantalloube, M. N’Diaye, D. Gratadour, F. Ferreira, M. Tallon, J. Mazoyer, D. Segransan, D. Mouillet, J.-L. Beuzit, M. Bonnefoy, R. Galicher, A. Vigan, I. Snellen, M. Feldt, S. Desidera, S. Rousseau, A. Baruffolo, C. Goulas, P. Baudoz, C. Bechet, M. Benisty, A. Bianco, B. Carry, E. Cascone, B. Charnay, E. Choquet, V. Christiaens, F. Cortecchia, V. Di Capprio, A. De Rosa, C. Desgrange, V. D'Orazi, S. Douté, M. Frangiamore, E. Gendron, C. Ginski, E. Huby, C. Keller, C. Kulcsár, R. Landman, S. Lagarde, E. Lagadec, A.-M. Lagrange, M. Lombini, M. Kasper, F. Ménard, Y. Magnard, G. Malaguti, D. Maurel, D. Mesa, G. Morgante, E. Pantin, T. Pichon, A. Potier, P. Rabou, S. Rochat, l. Terenzi, E. Thiébaut, I. Tallon-Bosc, H.-F Raynaud, D. Rouan, A. Sevin, F. Schiavone, L. Schrieber, A. Zanutta

Proceedings Volume 12184, 121841S (2022) https://doi.org/10.1117/12.2630154

KEYWORDS: Optical spheres, Planets, Exoplanets, Astronomy, Astrophysics, Spectral resolution, Adaptive optics, Stars, Wavefront sensors, Coronagraphy

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Proceedings Article | 29 August 2022 Presentation

ExoEarth yield estimates for the LUVOIR-A coronagraph instrument

Roser Juanola-Parramon, Christopher Stark, Neil Zimmerman, Axel Potier, Garreth Ruane

Proceedings Volume 12180, 1218021 (2022) https://doi.org/10.1117/12.2629617

KEYWORDS: Coronagraphy, Wavefronts, Wavefront sensors, Exoplanets, Ultraviolet radiation, UV optics, Telescopes, Stars, Spectrographs, Space operations

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Proceedings Article | 29 August 2022 Poster

Update on the survivability of high-actuator-count MEMS deformable mirror to rocket launch.

Axel Potier, Garreth Ruane, Camilo Mejia Prada, Wesley Baxter, Duncan Liu, Hong Tang, A.J. Eldorado Riggs, Phillip Poon, Eduardo Bendek, Nick Siegler, Mary Soria, Mark Hetzel, Charlie Lam, Paul Bierden

Proceedings Volume 12180, 121805S (2022) https://doi.org/10.1117/12.2629915

KEYWORDS: Microelectromechanical systems, Deformable mirrors, Rockets, Exoplanets, Coronagraphy, Wavefronts, Reliability, Manufacturing, Astrophysics, Astronomy

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Proceedings Article | 27 August 2022 Poster + Paper

Contrast performance of an 8m off-axis, segmented space telescope equipped with an adaptive optics system

Axel Potier, Garreth Ruane, Kiarash Tajdaran, Chris Stark, Pin Chen, Larry Dewell, Roser Juanola-Parramon, Alison Nordt, Laurent Pueyo, A.J. Eldorado Riggs, David Redding, Dan Sirbu

Proceedings Volume 12180, 121805D (2022) https://doi.org/10.1117/12.2629902

KEYWORDS: Coronagraphy, Adaptive optics, Telescopes, Stars, Image segmentation, Wavefront sensors, Space telescopes, Performance modeling, Wavefronts, Mirrors

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Proceedings Article | 3 September 2021 Presentation + Paper

LUVOIR-ECLIPS closed-loop adaptive optics performance and contrast predictions

Axel Potier, Garreth Ruane, Pin Chen, Ankur Chopra, Larry Dewell, Roser Juanola Parramon, Alison Nordt, Laurent Pueyo, David Redding, AJ Eldorado Riggs, Dan Sirbu

Proceedings Volume 11823, 118231L (2021) https://doi.org/10.1117/12.2595116

KEYWORDS: Adaptive optics, Wavefronts, Wavefront sensors, Telescopes, Principal component analysis, Coronagraphy, Exoplanets

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Proceedings Article | 1 September 2021 Presentation + Paper

Environmental testing of high-actuator-count MEMS deformable mirrors for space-based applications

Camilo M. Prada, Duncan Liu, Garreth Ruane, Hong Tang, Axel Potier, Paul Bierden, Charlie Lam

Proceedings Volume 11823, 118230M (2021) https://doi.org/10.1117/12.2594263

KEYWORDS: Actuators, Microelectromechanical systems, Deformable mirrors, Oxides, Mirrors, Coronagraphy, Silicon, Etching, Manufacturing, Semiconducting wafers

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Proceedings Article | 1 September 2021 Poster + Paper

Design and commissioning of an in-air coronagraph testbed in the HCIT facility at NASA’s Jet Propulsion Laboratory

Wesley Baxter, Axel Potier, Garreth Ruane, Camilo Mejia Prada

Proceedings Volume 11823, 118231S (2021) https://doi.org/10.1117/12.2601432

KEYWORDS: Coronagraphy, Microelectromechanical systems, Polarization, Exoplanets

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Proceedings Article | 21 August 2018 Paper

Current limitation of the THD2 bench: the scatter issue

A. Potier, P. Baudoz, R. Galicher, F. Patru, S. Thijs

Proceedings Volume 10698, 106986G (2018) https://doi.org/10.1117/12.2313986

KEYWORDS: Bidirectional reflectance transmission function, Scattering, Exoplanets, Coronagraphy

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Proceedings Article | 12 July 2018 Paper

In-lab testing of six-level phase mask coronagraphs onto the high-contrast imaging THD2 bench

Fabien Patru, Pierre Baudoz, Raphaël Galicher, Faouzi Boussaha, Josiane Firminy, Qing Cao, Kai Wang, Lujing Xing, Marion Bonafous, Axel Potier

Proceedings Volume 10703, 107032L (2018) https://doi.org/10.1117/12.2314152

KEYWORDS: Etching, Coronagraphy, Signal attenuation, Manufacturing, Data modeling, Exoplanets, Reactive ion etching, Optical lithography

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While radial velocity and transit techniques are efficient to probe exoplanets with short orbits, the study of long-orbit planets requires direct imaging and coronagraphic techniques. However, the coronagraph must deal with planets that are 10⁴ to 10¹⁰ fainter than their hosting star at a fraction of arcsecond, requiring efficient coronagraphs at short angular separation. Phase masks proved to be a good solution in monochromatic or limited spectral bandwidth but expansion to broadband requires complex phase achromatization. Solutions use photonic crystals, subwavelength grating or liquid crystal polymers but their manufacturing remains complex. An easier solution is to use photolithography and reactive ion etching and to optimize the azimuthal phase distribution like achieved in the six-level phase mask (SLPM) coronagraph (Hou et al. 2014). We present here the laboratory results of two SLPM coronagraphs enabling high-contrast imaging in wide-band. The SLPM is split in six sectors with three different depths producing three levels of optical path difference and yielding to uniform phase shifts of 0, π or 2π at the specified wavelength. Using six sectors instead of four sectors enables to mitigate the chromatic effects of the SLPM compared to the FQPM (Four-Quadrant Phase Mask) while keeping the manufacturing easy. Following theoretical developments achieved by University of Shanghai and based on our previous experience to fabricate FQPM components, we have manufactured SLPM components by reactive ion etching at Paris Observatory and we have tested it onto the THD2 facility at LESIA. The THD2 bench was built to study and compare high-contrast imaging techniques in the context of exoplanet imaging. The bench allows reducing the starlight below a 10⁻⁸ contrast level in visible/near-infrared. In this paper, we show that the SLPM is easy to fabricate at low cost and is easy to implement with a unique focal plane mask and no need of pupil apodization. Detection of a planet can be achieved at small inner working angle down to 1 λ/D. The on-axis attenuation of the best SLPM component reaches 2 × 10⁻⁵ at λ = 800 nm and is better than 10⁻⁴ in intensity over a 10% spectral bandwidth. Along the diagonal transition, we show that the off-axis transmission is attenuated by less than 3% over a 10% bandwidth and will need to be calibrated. Any etching imperfections can affect the SLPM performance, by lowering the on-axis attenuation and by changing the optimal wavelength. Despite few nanometers of uncertainty for etching the depths, we show that this first component can provide a high-contrast attenuation in laboratory

Proceedings Article | 10 July 2018 Presentation + Paper

Optimization and performance of multi-deformable mirror correction on the THD2 bench

Pierre Baudoz, Raphaël Galicher, Axel Potier, Olivier Dupuis, Simone Thijs, Fabien Patru

Proceedings Volume 10706, 107062O (2018) https://doi.org/10.1117/12.2314089

KEYWORDS: Coronagraphy, Mirrors, Deformable mirrors, Actuators, Spatial frequencies, Cameras, Planets

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