Mr. Christian du Jeu Profile

Christian du Jeu

Products & Technology Manager at Thales Seso Sas

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Publications (17)

Proceedings Article | 29 August 2022 Paper

Manufacturing and testing of the large lenses for the SDSS-V wide field corrector

Matthieu Gilles, Cédric Cammarata, Hélène Ducollet, Denis Fappani, Céline Lopez, Sylvain Perrin, Christian du Jeu, Bruno Delaborde, Patrick Robert, Julien Fourez, Stephen Smee, Robert Barkhouser, Aidan Gray

Proceedings Volume 12188, 121880M (2022) https://doi.org/10.1117/12.2627242

KEYWORDS: Lenses, Optics manufacturing, Optical coatings, Telescopes, Mirrors, Aspheric lenses, Spherical lenses, Polishing, Metrology

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Proceedings Article | 11 June 2021 Open Access

Improvement of molecular adhesion for spatial applications at Thales SESO over the past 20 years

Natacha Cocheteau, Christian Du Jeu, Alizee Loarer, Patrick Robert, Mailys Thorigny

Proceedings Volume 11852, 118521N (2021) https://doi.org/10.1117/12.2599287

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Molecular adhesion is a well-known process used on terrestrial optics and other fields. This process consists in joining two surfaces without the use of any adhesive or additional material. Molecular adhesion is a high-precision production process, and assemblies obtained present a dimensional stability due to the absence of mechanical part or glue. In addition, since no adhesive materials are used in this process, the risks of contamination associated with degassing are avoided. Based on this benefits, this process is of particular interest for optical system manufacturing for spatial applications. For over the past 20 years, Thales SESO develop its own process of molecular adhesion. For example among others, it has been applied on the manufacturing of Fabry-Perot interferometers. Such as fused silica Fabry-Perot for ALADIN program in the frame of AEOLUS mission (launched in August 2018) or fused silica/Zerodur® Fabry-Perot for ATLID program. Both interferometer have under vacuum cavity. On the ATLID Fabry-Perot the sealing is also made using molecular adhesion. Back then, the molecular adhesion mechanical strength admissible was around 1 MPa. Then, Thales SESO improve its molecular adhesion process - through lots of collaborations with CNES and other partners – in order to be able to bond more complex designs and increase the mechanical resistance. Today the molecular adhesion mechanical strength admissible has been multiplied by a factor five. Those improvement have been applied in the frame of the Third Generation Meteorological satellite (MTG-IRS) for the manufacturing of corner cubes in accordance with the mechanical and thermal environments of a geostationary orbit coupled with very strict optical performances. Today, several corner cubes have been manufactured, and the strength of adhered bond have been demonstrated in terms of thermal, shock and random solicitations through mechanical qualifications. The major advantage of molecular adhesion for the corner cube application is the stability of the WFE under vacuum – which have been also demonstrated. Here, an overview of the Thales SESO realizations starting from Fabry-Perot first results to the latest results on corner cubes performances as well as the future of molecular adhesion for space applications imagined by Thales SESO.

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Proceedings Article | 11 June 2021 Open Access

Thales SESO silver coatings for space programs

Patrick Robert, Christian Du Jeu, Cédric Cammarata, Mailys Thorigny, Karine Mathieu, Mattieu Tatat, Vincent Costes, Fabrice Champandard, Aurélien Suau, Guillaume Briche, Jean-François Blanc

Proceedings Volume 11852, 118524M (2021) https://doi.org/10.1117/12.2599795

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Proceedings Article | 11 June 2021 Open Access

Alignment and integration off-axis mirrors for space applications

Laure Tourrel, Christian Du Jeu, Patrick Robert, Alizee Loarer, Rupert Feckl, Christoph Bartscher, Gaia Fusco, Thomas Deuschle, Kathrina Weiß, Didier Miras, Daniel Lamarre, Donny Aminou, Pascal Hallibert

Proceedings Volume 11852, 1185230 (2021) https://doi.org/10.1117/12.2599462

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Proceedings Article | 26 August 2020 Paper

Reflective optics for EUV/x-ray sources at Thales SESO: possibilities and perspectives

Luca Peverini, H. Guadalupi, T. Michel, S. Perrin, R. Neviere, Christian du Jeu

Proceedings Volume 11492, 114920H (2020) https://doi.org/10.1117/12.2570604

KEYWORDS: Reflectivity, Imaging systems, Imaging spectroscopy, Metrology, Mirrors, Extreme ultraviolet, Hard x-rays, X-ray optics, X-ray technology, Optical design

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Proceedings Article | 15 November 2019 Presentation + Paper

Definitions of criteria for assessing feasibility and measurability of freeform surfaces

Christian du Jeu, Julien Fourez, Hassan El Handrioui, Matthieu Gilles

Proceedings Volume 11175, 1117510 (2019) https://doi.org/10.1117/12.2536663

KEYWORDS: Polishing, Surface finishing, Optics manufacturing, Computer generated holography, Spherical lenses, Interferometry, Mirrors, Optical testing, Optical spheres, Space mirrors

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Proceedings Article | 12 July 2019 Open Access

High performance large lightweight mirrors fabrication adapted to stress-mirror polishing (SMP) technique

S. Lemared, M. Ferrari, T. Dufour, C. Du Jeu, E. Hugot, G. Lemaitre

Proceedings Volume 11180, 111806T (2019) https://doi.org/10.1117/12.2536164

KEYWORDS: Polishing, Lightweight mirrors, Mirrors, Surface finishing, Optics manufacturing, Zernike polynomials, Active optics, Spherical lenses, Fabrication, Space mirrors

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Proceedings Article | 12 July 2019 Open Access

Shock and vibration tests of space light-weighted corner cubes manufactured with adhesion process

N. Cocheteau, C. du Jeu, M. Voisin, A. Maurel-Pantel, F. Lebon, S. Begoc

Proceedings Volume 11180, 111808B (2019) https://doi.org/10.1117/12.2536218

KEYWORDS: Mirrors, Manufacturing, Interferometers, Resistance, Satellites, Interfaces, Silica, Meteorological satellites, Polishing, Optics manufacturing

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Proceedings Article | 12 July 2019 Open Access

Active optics for next generation of space observation instruments

T. Viard, J. -F. Blanc, C. Devilliers, F. Champandard, B. Bailly, F. Falzon, J. -B. Ghibaudo, D. Sucher, G. Briche, V. Costes, C. Du Jeu

Proceedings Volume 11180, 1118008 (2019) https://doi.org/10.1117/12.2535927

KEYWORDS: Telescopes, Mirrors, Active optics, Thermal effects, Aerospace engineering, Deformable mirrors, Algorithm development, Optical alignment, Space mirrors, Phase retrieval

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Proceedings Article | 21 November 2017 Open Access

Computer assisted aspherical polishing: advantages and limits

Christian du Jeu

Proceedings Volume 10569, 105691J (2017) https://doi.org/10.1117/12.2307927

KEYWORDS: Polishing, Research management, Wavefronts, Surface finishing, Metrology

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Proceedings Article | 21 November 2017 Open Access

Manufacturing and control of the aspherical mirrors for the telescope of the satellite Pleiades

Hélène Ducollet, Christian du Jeu, Jean-Jacques Fermé

Proceedings Volume 10566, 105662J (2017) https://doi.org/10.1117/12.2308266

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Proceedings Article | 20 November 2017 Open Access

Development of the Laser Retroreflector Array (LRA) for SARAL

Vincent Costes, Karine Gasc, Pierre Sengenes, Corinne Salcedo, Stéphan Imperiali, Christian du Jeu

Proceedings Volume 10565, 105652K (2017) https://doi.org/10.1117/12.2309261

KEYWORDS: Laser development, Point spread functions, Ocean optics, Optics manufacturing, Retroreflectors, Satellites, Thermal modeling, Astronomical imaging, Reflectors, Optical fabrication

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Proceedings Article | 17 November 2017 Open Access

New design and new challenge for space large ultralightweight and stable Zerodur mirror for future high resolution observation instruments

C. Devilliers, C. Du Jeu, V. Costes, A. Suau, N. Girault, L. Cornillon

Proceedings Volume 10563, 105631I (2017) https://doi.org/10.1117/12.2304187

KEYWORDS: Mirrors, Space telescopes, Space mirrors, Telescopes, Adaptive optics, Deformable mirrors, Aerospace engineering, Polishing, Zerodur, Astronomical imaging

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Proceedings Article | 26 August 2010 Paper

Design and development of the Laser Retroreflector Array (LRA) for SARAL

Vincent Costes, Karine Gasc, Pierre Sengenes, Corinne Salcedo, Stephan Imperiali, Bernard Passier, Christian Du Jeu, Laurent Escarrat

Proceedings Volume 7813, 78130I (2010) https://doi.org/10.1117/12.863537

KEYWORDS: Laser development, Retroreflectors, Remote sensing, Systems engineering, Current controlled current source, Satellites, Reflectors, Manufacturing, Thermal modeling, Optimization (mathematics)

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Proceedings Article | 24 September 2004 Paper

Criterion to appreciate difficulties of aspherical polishing

Christian du Jeu

Proceedings Volume 5494, (2004) https://doi.org/10.1117/12.551420

KEYWORDS: Polishing, Surface finishing, Manufacturing, Mirrors, Optics manufacturing, Off axis mirrors, Lenses, Optical spheres, Spatial frequencies, Optical resolution

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Proceedings Article | 12 December 2003 Paper

Comparison of sintered-SiC and C/SiC mirror behavior at cryogenic temperatures

Andrea Novi, Giuseppe Mondello, Christophe Devilliers, Aldo Caso, Matthias Krodel, Mauro Ghigo, Christian duJeu

Proceedings Volume 5179, (2003) https://doi.org/10.1117/12.507261

KEYWORDS: Mirrors, Silicon carbide, Polishing, Cladding, Cryogenics, Optics manufacturing, Manufacturing, Optical coatings, Reflectivity, Silicon

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Proceedings Article | 17 December 1992 Paper

LIRA: a transportable Rayleigh lidar system

Michel Detaille, Christian du Jeu, Patrick Robert

Proceedings Volume 1714, (1992) https://doi.org/10.1117/12.138531

KEYWORDS: LIDAR, Atmospheric laser remote sensing, Temperature metrology, Rayleigh scattering, Knowledge management, Atmospheric physics, Remote sensing, Temporal resolution, Transmitters, Telescopes

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Showing 5 of 17 publications

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