Dr. Arielle Bertrou-Cantou Profile

Dr. Arielle Bertrou-Cantou

at Caltech

SPIE Involvement:

Author

Publications (13)

SPIE Journal Paper | 14 February 2024

Benefits of adding radial phase dimples on scalar coronagraph phase masks

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

JATIS, Vol. 10, Issue 01, 015001, (February 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.1.015001

KEYWORDS: Coronagraphy, Spiral phase plates, Monochromatic aberrations, Wavefront aberrations, Wavefronts, Scalable video coding, Phase shifts, Colorimetry, Wavefront errors, Planets

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Proceedings Article | 5 October 2023 Presentation + Paper

High contrast spectroscopy testbed (HCST): experimental results with an apodized vortex coronagraph

A. Bertrou-Cantou, J. Llop-Sayson, J. Liberman, D. Mawet, J. G. Hagopian, G. Ruane, A. J. Eldorado Riggs, E. Serabyn

Proceedings Volume 12680, 126801B (2023) https://doi.org/10.1117/12.2677902

KEYWORDS: Coronagraphy, Image segmentation, Apodization, Telescopes, Spectroscopy, Point spread functions, Simulations, Diffraction, Design and modelling, Reflection

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Proceedings Article | 5 October 2023 Poster + Paper

Achromatizing scalar vortex coronagraphs with radial phase mask dimples

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

Proceedings Volume 12680, 126802B (2023) https://doi.org/10.1117/12.2677224

KEYWORDS: Coronagraphy, Wavefronts, Phase shifts, Stars, Spiral phase plates, Polarization, Planets

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Proceedings Article | 5 October 2023 Presentation + Paper

Broadband wavefront control with a single mode fiber: 1E-8 raw contrast over 20% bandwidth

Jorge Llop-Sayson, Arielle Bertrou-Cantou, Joshua Liberman, Dimitri Mawet

Proceedings Volume 12680, 126801C (2023) https://doi.org/10.1117/12.2677556

KEYWORDS: Single mode fibers, Coronagraphy, Exoplanets, Spectroscopy

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Proceedings Article | 5 October 2023 Poster + Paper

Implicit electric field conjugation for improved starlight rejection through a single-mode fiber

Joshua Liberman, Jorge Llop-Sayson, Arielle Bertrou-Cantou, Dimitri Mawet, A.J. Eldorado Riggs, Niyati Desai

Proceedings Volume 12680, 126802D (2023) https://doi.org/10.1117/12.2677532

KEYWORDS: Single mode fibers, Electric fields, Wavefronts, Planets, Coronagraphy, Wavefront errors, Actuators, Telescopes, Equipment, Spatial frequencies

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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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Proceedings Article | 30 August 2022 Poster + Paper

The MICADO first light imager for the ELT: overview of the SCAO module at its final design

Yann Clénet, Tristan Buey, Eric Gendron, Sonia Karkar, Fabrice Vidal, Mathieu Cohen, Frédéric Chapron, Arnaud Sevin, Simone Thijs, Sylvestre Taburet, Bruno Borgo, Jean-Michel Huet, Alexandre Blin, Olivier Dupuis, Julien Gaudemard, Florian Ferreira, Jordan Raffard, Fanny Chemla, Vincent Lapeyrère, Vincent Deo, Arielle Bertrou-Cantou, Nicolas Galland, Sylvain Guieu, Eric Meyer, Nicolas Gautherot, Emmanuel Tisserand, Hervé Locatelli, François Meyer, Amal Zidi, Caroline Kulcsár, Henri-François Raynaud, Benoit Sassolas, Laurent Pinard, Christophe Michel, Damien Gratadour, Bertrand Le Ruyet, Roderick Dembet, Manuel Ortiz, Claude Collin, Vartan Arslanyan, Bosko Doncic, Lahoucine Ghouchou, Issan Ibn Taïeb, Pierre Baudoz, Elsa Huby, Gérard Rousset, Sebastian Rabien, Veronika Hörmann, Eckhard Sturm, Richard Davies

Proceedings Volume 12185, 121854S (2022) https://doi.org/10.1117/12.2629856

KEYWORDS: Prototyping, Adaptive optics, Calibration, Real-time computing

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Proceedings Article | 30 August 2022 Poster + Paper

The MICADO first light imager for the ELT: FDR numerical simulations for the SCAO mode

Fabrice Vidal, Nicolas Galland, Arielle Bertrou-Cantou, Eric Gendron, Vincent Deo, Amal Zidi, Florian Ferreira, Arnaud Sevin, Caroline Kulcsár, Henri-François Raynaud, Yann Clénet, Richard Davies

Proceedings Volume 12185, 121855O (2022) https://doi.org/10.1117/12.2629308

KEYWORDS: Actuators, Adaptive optics, Turbulence, Sensors, Modulation, Device simulation, K band, Reflectivity, Image segmentation, Computer simulations

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Proceedings Article | 29 August 2022 Presentation + Paper

Redundant Apodized Pupils (RAP) for high-contrast imagers robust to segmentation-due aberrations and island effect

Lucie Leboulleux, Alexis Carlotti, Mamadou N'Diaye, Faustine Cantalloube, Julien Milli, Arielle Bertrou-Cantou, David Mouillet, Nicolas Pourré, Christophe Vérinaud

Proceedings Volume 12188, 121881S (2022) https://doi.org/10.1117/12.2629276

KEYWORDS: Coronagraphy, Point spread functions, Image segmentation, Optical spheres, Telescopes, Surface plasmons, James Webb Space Telescope, Mirrors, Imaging systems, Thirty Meter Telescope

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Proceedings Article | 27 August 2022 Poster + Paper

Topological designs for scalar vortex coronagraphs

Niyati Desai, Jorge Llop-Sayson, Arielle Bertrou-Cantou, Garreth Ruane, A.J. Eldorado Riggs, Eugene Serabyn, Dimtiri Mawet

Proceedings Volume 12180, 121805H (2022) https://doi.org/10.1117/12.2630950

KEYWORDS: Coronagraphy, Spiral phase plates, Exoplanets, Optical vortices

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Proceedings Article | 29 October 2021 Presentation + Paper

High contrast imaging wavefront sensor referencing from coronagraphic images

Nour Skaf, Olivier Guyon, Anthony Boccaletti, Vincent Deo, Julien Lozi, Sebastien Vievard, Thayne Currie, Barnaby Norris, Kyohoon Ahn, Eric Gendron, Fabrice Vidal, Florian Ferreira, Arnaud Sevin, Arielle Bertrou-Cantou

Proceedings Volume 11823, 1182319 (2021) https://doi.org/10.1117/12.2595008

KEYWORDS: Coronagraphy, Adaptive optics, Point spread functions, Wavefronts, Cameras, Image quality, Telescopes, Wavefront sensors, Imaging systems, Computer simulations

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Proceedings Article | 13 December 2020 Presentation + Paper

Petalometry for the ELT: dealing with the wavefront discontinuities induced by the telescope spider

A. Bertrou-Cantou, E. Gendron, G. Rousset, F. Ferreira, A. Sevin, F. Vidal, Y. Clénet, T. Buey, S. Karkar

Proceedings Volume 11448, 1144812 (2020) https://doi.org/10.1117/12.2562091

KEYWORDS: Sensors, Telescopes, Large telescopes, Thermal effects, Mirrors, Atmospheric turbulence, Deformable mirrors, Optical instrument design, Adaptive optics, Turbulence

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Proceedings Article | 13 December 2020 Presentation + Paper

Hard real-time core software of the AO RTC COSMIC platform: architecture and performance

F. Ferreira, A. Sevin, J. Bernard, O. Guyon, A. Bertrou-Cantou, J. Raffard, F. Vidal, E. Gendron, D. Gratadour

Proceedings Volume 11448, 1144815 (2020) https://doi.org/10.1117/12.2561244

KEYWORDS: Real-time computing, Adaptive optics, Computer architecture, Telescopes, Interfaces, Structural health monitoring, Computing systems, Deformable mirrors, Large telescopes, Actuators

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With the upcoming giant class of telescopes, Adaptive Optics (AO) has become more essential than ever before to get access to the full potential offered by those telescopes. The complexity of such AO systems is reaching extreme heights, and disruptive developments will have to be made in order to build them. One of the critical component of a AO system is the Real Time Controller (RTC) which will have to compute the slopes and the Deformable Mirror (DM) commands at high frequency, in a range of 0.5 to several kHz. Since the complexity of the computations involved in the RTC is increasing with the size of the telescope, fulfilling RTC requirements for Extremely Large Telescope (ELT) class is a challenge. As an example, the MICADO SCAO (Single Conjugate Adaptive Optics) system requires around 1 TMAC/s for the RTC to get sufficient performance. This complexity brings the need for High Performance Computing (HPC) techniques and standards, such as the use of hardware accelerator like GPU. On top of that, building a RTC is often project-dependent as the components and the interfaces change from one instrument to an other. The COSMIC platforms aims at developing a common AO RTC platform which is meant to be powerful, modular and available to the AO community. This development is a joint effort between Observatoire de Paris and the Australian National University (ANU) in collaboration with the Subaru Telescope. We focus here on the current status of the core hard real-time component of this platform. The H-RTC pipeline is composed of Business Units (BU): each BU is an independent process in charge of one particular operation, such as Matrix Vector Multiply (MVM) or centroid computation, that can be made on CPU or on GPU. BUs read and write data on Shared Memory (SHM) handled by the CACAO framework. Synchronization between each BU can then be made either by using semaphore or by busy waiting on the GPU to ensure very low jitter. The RTC pipeline can then be controlled through a Python interface. One of the key point of this architecture is that the interfaces of a BU with the various SHM is abstracted, so adding a new BU in the collection of available ones is straight forward. This approach allows a high performance, scalable, modular and configurable RTC pipeline that could fit the needs of any AO system configuration. Performance has been measured on a MICADO SCAO scale RTC pipeline with around 25,000 slopes by 5,000 actuators on a DGX-1 system equipped with 8 Tesla V100 GPUs. The considered pipeline is composed of two BUs : the first one takes an input the raw pyramid WFS image (produced by simulator), applies on it dark and flat references, and then extract the useful pixel from the image. The second BU performs the MVM and the integration of the commands following a classical integrator command law. Synchronization between the BU is made through GPU busy waiting on the BU inputs. Performance obtained shows a mean latency up to 235 μs using 4 GPUs, with a jitter of 4.4 μs rms and a maximum jitter of 30 μs

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