Mr. Nicolas Levraud Profile

Nicolas Levraud

at Observatoire de Paris-Meudon

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Author

Publications (10)

Proceedings Article | 3 September 2024 Presentation + Paper

Properties of petal mode and its measurement in an adaptive optic closed loop

Nicolas Levraud, Mahawa Cisse, Vincent Chambouleyron, Jean-François Sauvage, Benoît Neichel, Thierry Fusco

Proceedings Volume 13097, 130972E (2024) https://doi.org/10.1117/12.3020124

KEYWORDS: Modulation, Spatial filtering, Adaptive optics, Telescopes, Discontinuities, Sensors, Modulation frequency, Atmospheric turbulence, Tunable filters, Mirrors

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Proceedings Article | 27 August 2024 Presentation + Paper

Description of the non-linear behaviour of Fourier filtering wavefront sensor using matrix formalism: the specific matrix

Mahawa Cisse, Olivier Fauvarque, Vincent Chambouleyron, Nicolas Levraud, Charlotte Bond, Benoit Neichel, Jean-François Sauvage, Thierry Fusco

Proceedings Volume 13097, 130970W (2024) https://doi.org/10.1117/12.3019046

KEYWORDS: Matrices, Wavefronts, Wavefront sensors, Calibration, Adaptive optics, Phase measurement, Modulation, Phase shift keying, Tunable filters, Phase reconstruction

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Proceedings Article | 30 August 2022 Presentation + Paper

Optimizing Fourier-filtering WFS to reach sensitivity close to the fundamental limit

V. Chambouleyron, O. Fauvarque, C. Plantet, J.-F. Sauvage, N. Levraud, M. Cissé, B. Neichel, T. Fusco

Proceedings Volume 12185, 121852T (2022) https://doi.org/10.1117/12.2629452

KEYWORDS: Sensors, Point spread functions, Adaptive optics, Optimization (mathematics), Spatial frequencies, Wavefront sensors, Photodetectors, Wavefronts, Telescopes, Optical filters

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Proceedings Article | 30 August 2022 Poster + Paper

Adapting the pyramid wavefront sensor for pupil fragmentation of the ELT class telescopes

Nicolas Levraud, Vincent Chambouleyron, Olivier Fauvarque, Mahawa Cisse, Jean-François Sauvage, Benoît Neichel, Charlotte Bond, Enrico Pinna, Simone Esposito, Noah Schwartz, Thierry Fusco

Proceedings Volume 12185, 1218559 (2022) https://doi.org/10.1117/12.2629861

KEYWORDS: Adaptive optics, Modulation, Turbulence, Sensors, Wavefront sensors, Telescopes, Wavefronts, Spatial filters, Device simulation, Phase measurement

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Proceedings Article | 30 August 2022 Presentation + Paper

HARMONI at ELT: wavefront control in SCAO mode

Charlotte Bond, Jean-François Sauvage, Noah Schwartz, Nicolas Levraud, Vincent Chambouleyron, Carlos Correia, Thierry Fusco, Benoit Neichel

Proceedings Volume 12185, 121851B (2022) https://doi.org/10.1117/12.2627713

KEYWORDS: Adaptive optics, Wavefronts, Point spread functions, Modulation, Actuators, Wavefront sensors, Telescopes, Calibration

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Proceedings Article | 30 August 2022 Presentation + Paper

The phase-shifted Zernike wave-front sensor

Mahawa Cisse, Vincent Chambouleyron, Olivier Fauvarque, Charlotte Bond, Nicolas Levraud, Jean-François Sauvage, Benoit Neichel, Thierry Fusco

Proceedings Volume 12185, 121850X (2022) https://doi.org/10.1117/12.2628885

KEYWORDS: Sensors, Adaptive optics, Telescopes, Phase measurement, Error analysis, Phase shifts, Large telescopes

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Proceedings Article | 29 August 2022 Presentation

HARMONI at ELT: impact of low wind effect on SCAO mode performance

Jean François Sauvage, Charlotte Bond, Thierry Fusco, Benoit Neichel, Noah Schwartz, Carlos Correia, Vincent Chambouleyron, Nicolas Levraud, Kjetil Dohlen, Kacem El Hadi, Mahawa Cisse, Niranjan Thatte, Fraser Clarke, David Le Mignant, Jérôme Amiaux

Proceedings Volume 12185, 1218519 (2022) https://doi.org/10.1117/12.2627698

KEYWORDS: Adaptive optics, Telescopes, Mirrors, Diffraction, Wind energy, Tomography, Spectrographs, Spatial resolution, Point spread functions, Photons

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Proceedings Article | 29 August 2022 Presentation

Super-resolution wavefront reconstruction in adaptive-optics with pyramid sensors

Carlos Correia, Jean-François Sauvage, Sylvain Oberti, Benoît Neichel, Thierry Fusco, Charlotte Bond, Vincent Chambouleyron, Nicolas Levraud, Noah Schwartz, Markus Feldt, Thomas Bertram

Proceedings Volume 12185, 121850J (2022) https://doi.org/10.1117/12.2632753

KEYWORDS: Super resolution, Sensors, Wavefront reconstruction, Lawrencium, Wavefront sensors, Systems modeling, Signal processing, Optical simulations, Optical design, Diffraction

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Proceedings Article | 29 August 2022 Poster

First light for PAPYRUS, the pyramid based adaptive optics system at LAM/OHP

Vincent Chambouleyron, Idir Boudjema, Romain Fétick, Eduard Muslimov, Felipe Pedreros Bustos, Nicolas Levraud, Esther Soria Hernandez, Amandine Caillat, Jérôme Schmitt, Jean-François Sauvage, Benoît Neichel, Thierry Fusco, Mahawa Cissé, Maxime Massa, François Leroux, Fabrice Madec, Sonia Karkar, Kacem El-Hadi, Alexis Lau, Romain Lhoussaine

Proceedings Volume 12185, 121856T (2022) https://doi.org/10.1117/12.2629444

KEYWORDS: Adaptive optics, Wavefront sensors, Telescopes, Infrared sensors, Heart, Glasses, Electron multiplying charge coupled devices, Deformable mirrors, Control systems, Cameras

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Proceedings Article | 24 September 2021 Presentation + Paper

Current status of PAPYRUS: the pyramid based adaptive optics system at LAM/OHP

E. Muslimov, N. Levraud, V. Chambouleyron, I. Boudjema, A. Lau, A. Caillat, F. Pedreros, G. Otten, K. El Hadi, K. Joaquina, M. Maxime, M. El Morsy, O. Beltramo-Martin, R. Fétick, Z. Ke, J-F. Sauvage, B. Neichel, T. Fusco, J. Schmitt, A. Le Van Suu, J. Charton, A. Schimpf, B. Martin, F. Dintrono, S. Esposito, E. Pina

Proceedings Volume 11876, 118760H (2021) https://doi.org/10.1117/12.2597170

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Showing 5 of 10 publications

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