Dr. Pierre Riaud Profile

Dr. Pierre Riaud

Physicist/Optician at Liège Univ

SPIE Involvement:

Author

Publications (19)

Proceedings Article | 13 April 2018 Paper

JWST: A mid-IR coronagraph for imaging extrasolar planets

Anthony Boccaletti, Pierre Riaud, P. Baudoz, J. Baudrand, J. M. Reess, D. Rouan

Proceedings Volume 10568, 1056827 (2018) https://doi.org/10.1117/12.2500102

Read Abstract +

Proceedings Article | 7 September 2016 Paper

Optical design options for hypertelescopes and prototype testing

Erick Bondoux, Sandra Bosio, Rijuparna Chakraborty, Wassila Dali-Ali, Antoine Labeyrie, Bruno Lacamp, Jerome Maillot, Denis Mourard, Paul Nunez, Jordi Pijoan, Rémi Prudhomme, Pierre Riaud, Martine Roussel, Arun Surya, Bernard Tregon, Thomas Houllier, Thierry Lepine, Patrick Rabou, André Rondi, Yves Bresson, David Vernet

Proceedings Volume 9907, 99071J (2016) https://doi.org/10.1117/12.2234434

KEYWORDS: Mirrors, Stars, Space telescopes, Cameras, Telescopes, Optical design, Prototyping, Interferometers, Sensors, Cadmium

Read Abstract +

Proceedings Article | 15 September 2011 Paper

Taking the vector vortex coronagraph to the next level for ground- and space-based exoplanet imaging instruments: review of technology developments in the USA, Japan, and Europe

Dimitri Mawet, Naoshi Murakami, Christian Delacroix, Eugene Serabyn, Olivier Absil, Naoshi Baba, Jacques Baudrand, Anthony Boccaletti, Rick Burruss, Russell Chipman, Pontus Forsberg, Serge Habraken, Shoki Hamaguchi, Charles Hanot, Akitoshi Ise, Mikael Karlsson, Brian Kern, John Krist, Andreas Kuhnert, Marie Levine, Kurt Liewer, Stephen McClain, Scott McEldowney, Bertrand Mennesson, Dwight Moody, Hiroshi Murakami, Albert Niessner, Jun Nishikawa, Nada O'Brien, Kazuhiko Oka, Peggy Park, Pierre Piron, Laurent Pueyo, Pierre Riaud, Moritsugu Sakamoto, Motohide Tamura, John Trauger, David Shemo, Jean Surdej, Nelson Tabirian, Wesley Traub, James Wallace, Kaito Yokochi

Proceedings Volume 8151, 815108 (2011) https://doi.org/10.1117/12.896059

KEYWORDS: Coronagraphy, Polarization, Spiral phase plates, Photonic crystals, Liquid crystals, Polymers, Telescopes, Exoplanets, Space telescopes, Optics manufacturing

Read Abstract +

Proceedings Article | 22 July 2010 Paper

Development of a CELestial Infrared Nuller Experiment (CELINE) for broadband nulling and new single-mode fiber testing

Charles Hanot, Pierre Riaud, Dimitri Mawet, Olivier Absil, Jean Surdej, Serge Habraken

Proceedings Volume 7734, 77342L (2010) https://doi.org/10.1117/12.856843

KEYWORDS: Single mode fibers, Nulling interferometry, Phase shifts, Interferometry, Interferometers, K band, Infrared radiation, Optical filters, Wave plates, Exoplanets

Read Abstract +

Proceedings Article | 22 July 2010 Paper

Development of a statistical reduction method for the Palomar Fiber Nuller

Charles Hanot, Bertrand Mennesson, Eugene Serabyn, Stefan Martin, Kurt Liewer, Frank Loya, Dimitri Mawet, Pierre Riaud, Olivier Absil

Proceedings Volume 7734, 77342S (2010) https://doi.org/10.1117/12.857014

KEYWORDS: Neodymium, Interferometry, Calibration, Nulling interferometry, Error analysis, Stars, Statistical analysis, Sodium, Interferometers, Visibility

Read Abstract +

Proceedings Article | 28 July 2008 Paper

Laboratory characterization of the chessboard achromatic phase shifter

Daniel Rouan, D. Pelat, N. Meilard, Jean-Michel Reess, Fanny Chemla, Pierre Riaud

Proceedings Volume 7013, 70131S (2008) https://doi.org/10.1117/12.787066

KEYWORDS: Planets, Stars, Phase shifts, Mirrors, Etching, Point spread functions, Manufacturing, Binary data, Interferometers, Photoresist materials

Read Abstract +

Proceedings Article | 19 September 2007 Paper

The annular groove phase mask coronagraph: an achromatic optical vortex

Dimitri Mawet, Pierre Riaud, Charles Hanot, Denis Vandormael, Jérôme Loicq, Jacques Baudrand, Jean Surdej, Serge Habraken

Proceedings Volume 6693, 66931M (2007) https://doi.org/10.1117/12.758406

KEYWORDS: Coronagraphy, Polarization, Polarimetry, Spiral phase plates, Optical vortices, Quantum wells, Manufacturing, Numerical simulations, Speckle, Prototyping

Read Abstract +

Proceedings Article | 19 September 2007 Paper

A new concept of achromatic phase shifter for nulling interferometry

Daniel Rouan, D. Pelat, Marie Ygouf, Jean-Michel Reess, Fanny Chemla, Pierre Riaud

Proceedings Volume 6693, 669316 (2007) https://doi.org/10.1117/12.725855

KEYWORDS: Mirrors, Phase shifts, Planets, Stars, Nulling interferometry, Telescopes, Interferometers, Photons, Manufacturing, Signal to noise ratio

Read Abstract +

Direct detection and characterization of a planet around a star by nulling interferometry, must be efficient in a large wavelength domain in order to detect simultaneously the infrared bio-tracers CO₂, O₃ and H₂O. This condition requires that an achromatic phase shift of π be implemented, with an accuracy sufficient for achieving a deep nulling at all considered wavelengths. Several solutions have been presented. We present here a new concept for designing such an achromatic phase shifter. It is based on two cellular mirrors (alternatively, transparent plates can be used) where cells have thickness which are respectively odd and even multiples of a quarter of the central wavelength. Each cell introduces then a phase shift of (2k + 1)π or of 2kπ, on the fraction of the wave it reflects. Each mirror is introduced in the collimated beam issued from one or the other telescopes. Because of the odd/even distribution, a destructive interference is obviously produced on axis for the central wavelength when recombining the two beams. The trick to obtain a quasi-achromatisation is to distribute the thickness of the cells, so that the nulling is also efficient for a wavelength not too far from the central wavelength. We show that if the thicknesses are distributed according to the Pascal triangle, a fair quasi-achromatism is reached. This effect is the more efficient that the number of cells is large. For instance, with 256 × 256 cells, where phase shift range is between -6π and +6π one shows that the nulling reaches 10^-6 on the wavelength range [0.7λ₀, 1.3λ₀] which corresponds roughly to the DARWIN specification. In a second step, we study the optimum way to distribute the cells in the plane of the pupil. The most important criterion is the isolation of the planet image from the residual image of the star. Several efficient configurations are presented. Finally we consider some practical aspects on a device belonging to the real world and on the bench we are developing. The major interest of this solution is that it allows a compact, simple and fully symmetric design, with essentially no ajustable sub-systems ; extension to multi-telescopes interferometers with phase shift other than π can also be envisioned.

Proceedings Article | 28 June 2006 Paper

Infrared achromatic phase shifters using modulated total internal reflection

Dimitri Mawet, Cédric Lenaerts, Pierre Riaud, Denis Vandormael, Jérome Loicq, David Verstraeten, Karl Fleury, Serge Habraken, Jean Surdej

Proceedings Volume 6268, 62682J (2006) https://doi.org/10.1117/12.671572

KEYWORDS: Phase shifts, Modulation, Interfaces, Diamond, Infrared radiation, Thin films, Reflection, Polarization, Germanium, Zinc

Read Abstract +

Proceedings Article | 27 June 2006 Paper

The 4m international liquid mirror telescope (ILMT)

J. Surdej, O. Absil, P. Bartczak, E. Borra, J.-P. Chisogne, J.-F. Claeskens, B. Collin, M. De Becker, D. Defrère, S. Denis, C. Flebus, O. Garcet, P. Gloesener, C. Jean, P. Lampens, C. Libbrecht, A. Magette, J. Manfroid, D. Mawet, Th. Nakos, N. Ninane, J. Poels, A. Pospieszalska, P. Riaud, P.-G. Sprimont, J.-P. Swings

Proceedings Volume 6267, 626704 (2006) https://doi.org/10.1117/12.671695

KEYWORDS: Telescopes, Charge-coupled devices, Mirrors, Liquids, Galactic astronomy, Sensors, Stars, Astronomy, CCD image sensors, Astronomical telescopes

Read Abstract +

Proceedings Article | 5 October 2005 Paper

The four-quadrant ZOG and annular groove phase mask coronagraphs

Dimitri Mawet, Pierre Riaud, Olivier Absil, Jacques Baudrand, Jean Surdej

Proceedings Volume 5905, 59051N (2005) https://doi.org/10.1117/12.640363

KEYWORDS: Coronagraphy, Spiral phase plates, Phase shifts, Diamond, Diffraction gratings, K band, Birefringence, Optical vortices, Refractive index, Polarization

Read Abstract +

Proceedings Article | 25 February 2004 Paper

Thin film approach for pi achromatic phase shifters

Frederic Lemarquis, Pierre Riaud

Proceedings Volume 5250, (2004) https://doi.org/10.1117/12.513404

KEYWORDS: Phase shifts, Reflectivity, Antireflective coatings, Mirrors, Coating, Thin films, Reflection, Planets, Polarization, Stars

Read Abstract +

Proceedings Article | 25 February 2004 Paper

Manufacturing of four-quadrant phase mask for nulling interferometry in the thermal infrared

Frederic Lemarquis, Michel Lequime, Gerard Albrand, Ludovic Escoubas, Jean-Jacques Simon, Jacques Baudrand, Pierre Riaud, Daniel Rouan, Anthony Boccaletti, Pierre Baudoz, Dimitri Mawet

Proceedings Volume 5250, (2004) https://doi.org/10.1117/12.513386

KEYWORDS: Coronagraphy, Manufacturing, Planets, Stars, Mid-IR, James Webb Space Telescope, Ions, Signal attenuation, Visible radiation, Nulling interferometry

Read Abstract +

Proceedings Article | 5 March 2003 Paper

Optical design for the 5-28um NGST infrared imager MIRI

Didier Dubreuil, Alain Abergel, Jacques Baudrand, Slimane Bensammar, Jacky Cretolle, Pascal Dargent, Philippe Galdemard, Jean Gay, Francois Lacombe, Pierre-Olivier Lagage, Laurent Martin, Eric Prieto, Yves Rabbia, Jean-Michel Reess, Pierre Riaud, Daniel Rouan, Sophie Salasca, Alain Simeri, Gillian Wright, J. Mols

Proceedings Volume 4850, (2003) https://doi.org/10.1117/12.461509

KEYWORDS: Mirrors, Imaging systems, Coronagraphy, Optical design, Sensors, Infrared imaging, Calibration, Spectroscopy, Prisms, Mid-IR

Read Abstract +

Proceedings Article | 5 March 2003 Paper

High-contrast coronagraphy with NGST in the mid-IR

Anthony Boccaletti, Pierre Riaud, Daniel Rouan, Jacques Baudrand

Proceedings Volume 4850, (2003) https://doi.org/10.1117/12.461613

KEYWORDS: Planets, Coronagraphy, Stars, Mirrors, Numerical simulations, Mid-IR, Jupiter, Device simulation, Point spread functions, Exoplanets

Read Abstract +

Proceedings Article | 3 March 2003 Paper

Estimated performances of a four-quadrant phase mask coronagraph for planet detection

Daniel Rouan, Anthony Boccaletti, Pierre Riaud, Jacques Baudrand

Proceedings Volume 4860, (2003) https://doi.org/10.1117/12.457655

KEYWORDS: Stars, Planets, Coronagraphy, Jupiter, Exoplanets, Adaptive optics, Space telescopes, Phase shifts, Mid-IR, Telescopes

Read Abstract +

Proceedings Article | 3 March 2003 Paper

Optical designs of snapshot interferometer for coronagraphy

Sophie Gillet, Pierre Riaud, Anthony Boccaletti, Jean Schneider

Proceedings Volume 4860, (2003) https://doi.org/10.1117/12.457654

KEYWORDS: Stars, Planets, Coronagraphy, Interferometers, Clouds, Mirrors, Signal attenuation, Numerical simulations, Electroluminescent displays, Optical design

Read Abstract +

Proceedings Article | 21 February 2003 Paper

VIDA (VLTI imaging with a densified array): a densified pupil combiner proposed for snapshot imaging with the VLTI

Olivier Lardiere, Antoine Labeyrie, Denis Mourard, Pierre Riaud, Luc Arnold, Julien Dejonghe, Sophie Gillet

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459076

KEYWORDS: Astatine, Telescopes, Stars, Coronagraphy, Interferometers, Mirrors, Interferometry, Exoplanets, K band, Cameras

Read Abstract +

Proceedings Article | 21 February 2003 Paper

High angular resolution in 2010-2020: a comparison between possible post-VLT/VLTI instruments

Luc Arnold, Anne-Marie Lagrange, Denis Mourard, Pierre Riaud, Marc Ferrari, Sophie Gillet, Pierre Kern, Laurent Koechlin, Antoine Labeyrie, Olivier Lardiere, Fabien Malbet, Guy Perrin, Gerard Rousset, Michel Tallon

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.458939

KEYWORDS: Space telescopes, Adaptive optics, Telescopes, Interferometry, Spatial resolution, Interferometers, Point spread functions, Aerospace engineering, Imaging arrays, Synthetic apertures

Read Abstract +

Showing 5 of 19 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years