Dr. Éric G. Lavastre Profile

Dr. Éric G. Lavastre

Engineer at CEA-Cesta

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Author

Publications (24)

Proceedings Article | 18 June 2024 Presentation

Development of dielectric mirrors by magnetron sputtering for high power laser facilities.

Océane Aubard, Marine Chorel, Eric Lavastre, Bruno Bousquet, Corinne Marcel

Proceedings Volume PC13020, PC130200I (2024) https://doi.org/10.1117/12.3017557

KEYWORDS: Sputter deposition, Magnetrons, Laser damage threshold, Silica, Refractive index, Mixtures, Mirrors, High power lasers, Dielectric mirrors, Plasma

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Proceedings Article | 18 June 2024 Presentation

Comprehensive study of microstructure and chemical composition of all-silica GLAD quarter-waveplate coatings for high power laser

Solène Bertet, Marine Chorel, Eric Lavastre, Sara MacNally, Corinne Marcel, Bruno Gallas, Marcela Mireles

Proceedings Volume PC13020, PC130200K (2024) https://doi.org/10.1117/12.3017015

KEYWORDS: Optical coatings, Laser microstructuring, High power lasers, Chemical composition, Silica, Resistance, Laser induced damage, Oxygen, Matrices, Laser development

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Proceedings Article | 24 November 2023 Poster

Development of mixed materials to improve the laser-induced damage threshold of multilayer dielectric mirrors for petawatt class lasers

Océane Aubard, Marine Chorel, Eric Lavastre, Corinne Marcel

Proceedings Volume PC12726, PC1272615 (2023) https://doi.org/10.1117/12.2685195

KEYWORDS: Laser damage threshold, Multilayers, Dielectric mirrors, Silica, Mirrors, Laser development, Sputter deposition, Spectroscopy, Scanning electron microscopy, Oxygen

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Proceedings Article | 24 November 2023 Presentation + Paper

Influence of the multilayer dielectric design on the laser damage resistance of pulse-compression gratings

Saaxewer Diop, Nicolas Bonod, Marine Chorel, Éric Lavastre, Nadja Roquin, Lilian Heymans, Pierre Brianceau, Laurent Gallais, Laurent Lamaignère

Proceedings Volume 12726, 1272607 (2023) https://doi.org/10.1117/12.2685304

KEYWORDS: Design and modelling, Laser induced damage, Resistance, Dielectrics, Optical gratings, Electric fields, Diffraction gratings, Laser damage threshold, Etching, Diffraction

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Proceedings Article | 4 March 2022 Presentation

Compensation of frequency modulation to amplitude modulation in regenerative amplifier using interference filter

Hadrien Devaine, Sébastien Montant , Eric A. Lavastre, Denis Penninckx, Alain Braud, Elodie Boursier

Proceedings Volume PC11980, PC119800D (2022) https://doi.org/10.1117/12.2607354

KEYWORDS: Interference filters, Amplitude modulation, Frequency modulation, Optical amplifiers, Optical filters, Optical components, Laser scattering, Scattering, Pulsed laser operation, Photodiodes

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Proceedings Article | 12 October 2021 Presentation

Toward a design optimization’s method to increase the laser induced damage threshold of MLD mirrors and gratings used in sub-picosecond regime

Marine Chorel, Florian Tournemenne, Eric Lavastre, Laurent Lamaignère, Saaxewer Diop, Nicolas Bonod

Proceedings Volume 11910, 119100V (2021) https://doi.org/10.1117/12.2600628

KEYWORDS: Mirrors, Laser damage threshold, Optical design, Laser induced damage, Optics manufacturing, Resistance, Refractive index, Pulsed laser operation, Picosecond phenomena, Multilayers

Proceedings Article | 12 September 2021 Presentation

Minimization of electric field intensity in pillars of MLD gratings through the design of the planar dielectric multilayers

Saaxewer Diop, Nicolas Bonod, Laurent Gallais, Marine Chorel, Eric A. Lavastre, Laurent Lamaignère

Proceedings Volume 11872, 1187207 (2021) https://doi.org/10.1117/12.2598972

KEYWORDS: Dielectrics, Optical design, Laser induced damage, Diffraction, Laser damage threshold, Etching, Picosecond phenomena, Optical components, Mirrors, Laser therapeutics

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Multilayer dielectric gratings (MLDG) are key optical components of Petawatt-class laser that are used to compress short pulses of high intensities. Laser-induced damage can occur on the top area of the components, typically arising in the pillars periodically etched. This phenomenon limits the power yielded by high power laser facilities such as PETAL (PETwatt Aquitaine Laser) laser facility. PETAL is expected to delivery pulses with a wavelength around 1053 nm, an energy around 3 kJ and a pulse duration between 0.5 and 10 ps. Coupled with LMJ (Laser MegaJoule), PETAL aims to study materials in extreme conditions to reproduce the environment in the heart of stars or planets, fusion by inertial confinement, particularly rapid ignition and shock ignition, and nuclear physics for medical proton therapy. In this study, we present a process to improve the laser-induced damage threshold of PETAL pulse-compression gratings in sub-picosecond regime by reducing the electric field intensity in the pillars. PETAL gratings have specific parameters of operation: Transverse Electric polarization, under vacuum, a period equal to 1780 lines per mm and diffraction efficiency higher than 95% for the -1st order. Theoretical designs are calculated with a code developed at the Fresnel Institute. The code solves Fresnel equations by using the differential method, Fast Fourier Factorization (FFF) and S matrix propagation algorithm. As a result, we obtain the distribution of the electric field and diffraction efficiency of any given diffraction order. First, starting with a given MLD mirror, we calculate an etching profile that maximizes the diffraction efficiency at the -1st order by taking into account the manufacturing constraints of future suppliers. Then, we optimize the mirror stack without changing the etching profile. We modify only the first top layers under the grooves. We obtained theoretical designs with the same etching profile and identical diffraction efficiency, associated with different electric field intensity values and expected different laser induced damage thresholds.

Proceedings Article | 16 May 2018 Paper

Laser damage metrology in the sub-ps range for the PETAL facility

Laurent Lamaignère, Martin Sozet, Eric Lavastre, Jérôme Néauport, Nadja Roquin, Laurent Gallais

Proceedings Volume 10713, 107130U (2018) https://doi.org/10.1117/12.2319809

KEYWORDS: Laser induced damage, Mirrors, Laser damage threshold, Laser development, Optical components, Metrology, Laser systems engineering, Optics manufacturing

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Proceedings Article | 23 February 2017 Paper

Laser damage metrology of PETAL optics

Laurent Lamaignère, Martin Sozet, Eric Lavastre, Jérôme Neauport, Nadja Roquin, Laurent Gallais

Proceedings Volume 10084, 100840C (2017) https://doi.org/10.1117/12.2249987

KEYWORDS: Laser induced damage, Resistance, Laser development, Pulsed laser operation, Laser damage threshold, Optical components, Optics manufacturing, Metrology, Mirrors, High power lasers, Laser systems engineering, Beam shaping

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Proceedings Article | 23 November 2015 Paper

Laser damage resistance of optical components in sub-picosecond regime in the infrared

Martin Sozet, Jérôme Néauport, Eric Lavastre, Nadja Roquin, Laurent Gallais, Laurent Lamaignère

Proceedings Volume 9632, 96320N (2015) https://doi.org/10.1117/12.2194286

KEYWORDS: Optical components, Laser induced damage, Resistance, Optical coatings, Pulsed laser operation, Laser optics, Infrared lasers, High power lasers, Manufacturing, Laser damage threshold, Mirrors, Scanning electron microscopy, Digital image correlation, Optics manufacturing, Infrared radiation, Dielectrics

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Proceedings Article | 12 May 2015 Paper

Sub-picosecond laser induced damage test facility for petawatt reflective optical components characterizations

Martin Sozet, Jérôme Néauport, Eric Lavastre, Nadja Roquin, Laurent Gallais, Laurent Lamaignère

Proceedings Volume 9513, 951316 (2015) https://doi.org/10.1117/12.2178734

KEYWORDS: Laser induced damage, Optical components, Dielectrics, Reflectivity, Laser damage threshold, Laser development, Resistance, Optical coatings, High power lasers, Fusion energy

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Proceedings Article | 18 February 2013 Paper

Update of Laser Mégajoule large optics wavefront performance requirements

Stéphane Mainguy, Jean-Philippe Airiau, Thierry Bart, Vincent Beau, Edouard Bordenave, Stéphane Bouillet, Christian Chappuis, Sandrine Chico, Philippe Cormont, Nathalie Darbois, Jérome Daurios, Vincent Denis, Laure Eupherte, Nathalie Ferriou-Darbois, Servane Fontaine, Gaël Gaborit, Claire Grosset-Grange, Eric Journot, Laurent Lamaignère, Thomas Lanternier, Eric Lavastre, Christophe Leymarié, Louis-André Lompré, Mélanie Mangeant, Cédric Maunier, Jérome Néauport, Etienne Perrot-Minnot, Gérard Razé, Stéphane Reyné, Claude Rouyer, Jean-Michel Sajer, Stéphane Seznec, Daniel Taroux, Sébastien Vermersch, Laurent Le Déroff

Proceedings Volume 8602, 86020G (2013) https://doi.org/10.1117/12.2004148

KEYWORDS: Wavefronts, Wave propagation, Optical components, Optical amplifiers, Laser optics, Mirrors, Numerical simulations, Spatial filters, Crystals, Near field optics

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Proceedings Article | 30 September 2011 Paper

Wavefront instabilities in thin glass mirrors

Stéphane Bouillet, Thomas Lanternier, Eric Lavastre, Christian Chappuis, François Macias

Proceedings Volume 8169, 816914 (2011) https://doi.org/10.1117/12.896773

KEYWORDS: Mirrors, Glasses, Distortion, Monochromatic aberrations, Wavefronts, Polishing, Actuators, Optical components, Wavefront distortions, Spherical lenses

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Proceedings Article | 29 November 2010 Paper

Mixed metal dielectric pulse compression gratings

J. Néauport, N. Bonod, S. Hocquet, S. Palmier, E. Lavastre, N. Baclet, G. Dupuy

Proceedings Volume 7842, 784209 (2010) https://doi.org/10.1117/12.866869

KEYWORDS: Laser damage threshold, Mirrors, Dielectrics, Laser development, Gold, Diffraction gratings, Manufacturing, Metals, Optical design, Silica

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Proceedings Article | 31 December 2009 Paper

Mixed metal dielectric gratings for pulse compression applications

J. Néauport, S. Palmier, N. Bonod, E. Lavastre, N. Baclet, G. Dupuy

Proceedings Volume 7504, 75040R (2009) https://doi.org/10.1117/12.836063

KEYWORDS: Diffraction gratings, Mirrors, Gold, Laser damage threshold, Optical design, Manufacturing, Reflectivity, Silica, Diffraction, Laser development

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Proceedings Article | 24 August 2009 Paper

Effect of the measurement wavelength on a multi-dielectric mirror wavefront

Sophiane Tournois, Stéphane Bouillet, Jérôme Daurios, Eric Lavastre

Proceedings Volume 7405, 74050Y (2009) https://doi.org/10.1117/12.827964

KEYWORDS: Mirrors, Refractive index, Wavefronts, Interferometers, Coating, Interferometry, Thin films, Silica, Optical components, Phase measurement

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Proceedings Article | 25 September 2008 Paper

Investigation of an automated cleaning system for LMJ coating sol-gel process

E. Lavastre, S. Fontaine, R. Bergez, P. Wender, P. Cormont, C. Pellegrini, L. Beaurain, P. Belleville

Proceedings Volume 7102, 710214 (2008) https://doi.org/10.1117/12.797445

KEYWORDS: Sol-gels, Silica, Coating, Glasses, Optical components, Surface finishing, Polishing, Laser optics, Atmospheric optics, Fusion energy

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Proceedings Article | 18 December 2007 Paper

Short pulse laser damage measurements of pulse compression gratings for petawatt laser

Gérard Razé, Jérôme Néauport, Gabriel Dupuy, Matthieu Balas, Gabriel Mennerat, Eric Lavastre

Proceedings Volume 6720, 67200Z (2007) https://doi.org/10.1117/12.752783

KEYWORDS: Laser induced damage, Laser damage threshold, Pulsed laser operation, Mirrors, Diffraction gratings, Laser development, Polarization, Optical benches, Gold, Laser sources

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Proceedings Article | 20 October 2005 Paper

Megajoule laser project and polishing processes for high laser induced damage threshold at 351 nm

J. Néauport, P. Cormont, N. Darbois, A. During, N. Ferriou, E. Lavastre, I. Legoff, D. Leschuitta, C. Maunier, C. Pellegrini, D. Taroux, D. Valla

Proceedings Volume 5965, 59650N (2005) https://doi.org/10.1117/12.633499

KEYWORDS: Silica, Polishing, Optics manufacturing, Laser induced damage, Laser damage threshold, Laser processing, Mirrors, Ultraviolet radiation, Crystals, Manufacturing

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Proceedings Article | 1 September 2005 Paper

Specific photometer for large coated optics

Gael Gaborit, Eric Lavastre, Isabelle Lebeaux, Jean-Christophe Poncetta

Proceedings Volume 5878, 58781A (2005) https://doi.org/10.1117/12.613900

KEYWORDS: Photometry, Transmittance, Polarizers, Reflectivity, Calibration, Humidity, Integrating spheres, Optical testing, Optical coatings, Prisms

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Proceedings Article | 25 February 2004 Paper

How smooth chemistry allows high-power laser optical coating preparation

Philippe Belleville, Philippe Prene, Claude Bonnin, Laurence Beaurain, Yves Montouillout, Eric Lavastre

Proceedings Volume 5250, (2004) https://doi.org/10.1117/12.513680

KEYWORDS: Optical coatings, Sol-gels, Antireflective coatings, Thin film coatings, Polymers, Refractive index, Silica, Mirrors, Chemistry, High power lasers

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For fifty years, a considerable effort has been and is still being directed to the production of optical coatings using liquid deposition route. Sol-Gel is a chemical process widely used for oxide material preparation. Based on smooth chemistry (low temperature conditions), sol-gel allows nanoparticle and polymeric material synthesis dispersed in appropriate liquid medium. The process investigated at CEA (French Commission for Atomic Energy) is strongly developed to afford coatings onto mineral or metallic substrates using colloidal oxide-based and/or inorganic-organic hybrid materials. Such a chemical process is sufficiently adjustable to develop purpose-built materials and coatings for high power laser optical components, taking into account the high laser damage threshold requirement. Because the CEA megajoule-class pulsed laser is needing 7,000-m² of coated area onto 10,000 large-sized optical components, we have developed to date, several optical coating procedures, each optical thin film being prepared from a specific material and deposition process. First need to fulfil was the antireflective (AR) coating required for transparent optics and used to increase laser light transmission and to suppress damaging residual reflection. The as-developed AR-coatings were made of nanosized particle-containing fragile single layer or abrasion-resistant polymeric-based broadband layer stack. For used on highly-reflective (HR) component, a specific unstressed multilayer coating has been developed and deposited onto deformable adaptative end-cavity mirror substrate. This HR-coating is made of quaterwave stack of colloidal-based low index and hybrid high index thin films. Using such materials, first high ratio polarizing sol-gel coatings have been also produced. Apart optical coating preparation, sol-gel chemistry has been used to develop an hybrid dense protective thin film to enhance durability of oxidation-sensitive silver cavity reflectors. Each coating material preparation and room-temperature deposition process will be described. Because the sol-gel technology offers outstanding technical and economical advantages over the conventional vacuum techniques, this process has been transferred to one of THALES production plant for megajoule-class laser prototype supplying.

Proceedings Article | 25 February 2004 Paper

Large-area sol-gel optical coatings for the Megajoule Laser prototype

Philippe Pegon, Chantal Germain, Yannick Rorato, Philippe Belleville, Eric Lavastre

Proceedings Volume 5250, (2004) https://doi.org/10.1117/12.512982

KEYWORDS: Optical coatings, Sol-gels, Silica, Mirrors, Calibration, Thin film coatings, Polymers, Diffraction gratings, Silicon, Glasses

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Proceedings Article | 9 April 2002 Paper

Laser megajoule 1.06-um mirror production with very high laser damage threshold

B. Pinot, Herve Leplan, Francois Houbre, Eric Lavastre, Jean-Christophe Poncetta, Genevieve Chabassier

Proceedings Volume 4679, (2002) https://doi.org/10.1117/12.461687

KEYWORDS: Mirrors, Laser damage threshold, Laser induced damage, Hafnium, Optical coatings, Wavefronts, Photometry, Reflectivity, Interferometers, Metals

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Proceedings Article | 12 April 2001 Paper

Room-temperature mirror preparation using sol-gel chemistry and laminar-flow coating technique

Philippe Belleville, Claude Bonnin, Eric Lavastre, Philippe Pegon, Yannick Rorato

Proceedings Volume 4347, (2001) https://doi.org/10.1117/12.425016

KEYWORDS: Coating, Sol-gels, Composites, Mirrors, Refractive index, Oxides, Particles, Polymers, Silica, Laser damage threshold

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Showing 5 of 24 publications

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