Dr. Marie Laslandes Profile

Dr. Marie Laslandes

Research Engineer in Adaptive Optics at ALPAO SAS

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Publications (17)

Proceedings Article | 11 June 2021 Open Access

Towards the spatialization of ALPAO dms

M. Laslandes

Proceedings Volume 11852, 118524J (2021) https://doi.org/10.1117/12.2599663

KEYWORDS: Actuators, Spatial frequencies, Mirrors, Electronics, Deformable mirrors, Reliability, Telescopes, Surface finishing, Space telescopes, Precision calibration

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Proceedings Article | 9 March 2020 Presentation

Extending the field of view with multiconjugate adaptive optics optical coherence tomography (Conference Presentation)

Muhammad Faizan Shirazi, Elisabeth Brunner, Marie Laslandes, Christoph K. Hitzenberger, Michael Pircher

Proceedings Volume 11228, 112280U (2020) https://doi.org/10.1117/12.2547688

KEYWORDS: Adaptive optics optical coherence tomography, Adaptive optics, Imaging systems, Retinal scanning, Eye, Visualization, Cones, Retina, Image resolution, Rods

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Proceedings Article | 14 March 2018 Presentation

Large field of view adaptive optics scanning laser ophthalmoscopy and optical coherence tomography (Conference Presentation)

Marie Laslandes, Matthias Salas, Andreas Wartak, Christoph Hitzenberger, Michael Pircher

Proceedings Volume 10474, 104740H (2018) https://doi.org/10.1117/12.2287120

KEYWORDS: Adaptive optics, Scanning laser ophthalmoscopy, Retinal scanning, Eye, Retina, Scanning laser ophthalmoscopes, Deformable mirrors, Wavefront sensors, Sensors, In vivo imaging

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Proceedings Article | 11 January 2018 Open Access

Active optics: off axis aspherics generation for high contrast imaging

E. Hugot, M. Laslandes, M. Ferrari, S. Vives, S. Moindrot, K. El Hadi, K. Dohlen

Proceedings Volume 10565, 1056553 (2018) https://doi.org/10.1117/12.2309119

KEYWORDS: Polishing, Mirrors, Surface finishing, Actuators, Aspheric lenses, Monochromatic aberrations, Optical spheres, Finite element methods, Active optics, Coronagraphy

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Active Optics methods, based on elasticity theory, allow the aspherisation of optical surfaces by stress polishing but also active aspherisation in situ. Researches in this field will impact the final performance and the final cost of any telescope or instrument. The stress polishing method is well suited for the superpolishing of aspheric components for astronomy. Its principle relies on spherical polishing with a full-sized tool of a warped substrate, which becomes aspherical once unwarped. The main advantage of this technique is the very high optical quality obtained either on form or on high spatial frequency errors. Furthermore, the roughness can be decreased down to a few angstroms, thanks the classical polishing with a large pitch tool, providing a substantial gain on the final scientific performance, for instance on the contrast on coronagraphic images, but also on the polishing time and cost. Stress polishing is based on elasticity theory, and requires an optimised deformation system able to provide the right aspherical form on the optical surface during polishing. The optical quality of the deformation is validated using extensive Finite Element Analysis, allowing an estimation of residuals and an optimisation of the warping harness. We describe here the work realised on stress polishing of toric mirrors for VLT-SPHERE and then our actual work on off axis aspherics (OAA) for the ASPIICS-Proba3 mission for solar coronagraphy. The ASPIICS optical design made by Vives et al is a three mirrors anastigmat including a concave off axis hyperboloid and a convex off axis parabola (OAP). We are developing a prototype in order to demonstrate the feasibility of this type of surface, using a multi-mode warping harness (Lemaitre et al). Furthermore, we present our work on variable OAP, meaning the possibility to adjust the shape of a simple OAP in situ with a minimal number of actuators, typically one actuator per optical mode (Focus, Coma and Astigmatism). Applications for future space telescopes and instrumentation are discussed.

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Proceedings Article | 20 November 2017 Open Access

Last results of MADRAS, a space active optics demonstrator

Marie Laslandes, Claire Hourtoule, Emmanuel Hugot, Marc Ferrari, Christophe Devilliers, Arnaud Liotard, Céline Lopez, Frédéric Chazallet

Proceedings Volume 10564, 1056413 (2017) https://doi.org/10.1117/12.2309206

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Proceedings Article | 20 November 2017 Open Access

Space active optics: in flight aberrations correction for the next generation of large space telescopes

M. Laslandes, M. Ferrari, E. Hugot, G. Lemaitre

Proceedings Volume 10565, 105651Z (2017) https://doi.org/10.1117/12.2309120

KEYWORDS: Mirrors, Space telescopes, Astronomical imaging, Actuators, Active optics, Finite element methods, Deformable mirrors, Monochromatic aberrations, Aberration correction, Optical aberrations

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The need for both high quality images and light structures is a constant concern in the conception of space telescopes. In this paper, we present an active optics system as a way to fulfill those two objectives. Indeed, active optics consists in controlling mirrors’ deformations in order to improve the images quality [1]. The two main applications of active optics techniques are the in-situ compensation of phase errors in a wave front by using a corrector deformable mirror [2] and the manufacturing of aspherical mirrors by stress polishing or by in-situ stressing [3]. We will focus here on the wave-front correction. Indeed, the next generation of space telescopes will have lightweight primary mirrors; in consequence, they will be sensitive to the environment variations, inducing optical aberrations in the instrument.

An active optics system is principally composed of a deformable mirror, a wave front sensor, a set of actuators deforming the mirror and control/command electronics. It is used to correct the wave-front errors due to the optical design, the manufacturing imperfections, the large lightweight primary mirrors’ deflection in field gravity, the fixation devices, and the mirrors and structures’ thermal distortions due to the local turbulence [4]. Active optics is based on the elasticity theory [5]; forces and/or load are used to deform a mirror. Like in adaptive optics, actuators can simply be placed under the optical surface [1,2], but other configurations have also been studied: a system’s simplification, inducing a minimization of the number of actuators can be achieved by working on the mirror design [5]. For instance, in the so called Vase form Multimode Deformable Mirror [6], forces are applied on an external ring clamped on the pupil. With this method, there is no local effect due to the application of forces on the mirror’s back face. Furthermore, the number of actuators needed to warp the mirror does not depend on the pupil size; it is a fully scalable configuration.

The insertion of a Vase form Multimode Deformable Mirror on the design of an optical instrument will allow correcting the most common low spatial frequency aberrations. This concept could be applied in a space telescope. A Finite Element Analysis of the developed model has been conducted in order to characterize the system’s behavior and to validate the concept.

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Proceedings Article | 21 February 2017 Presentation + Paper

Optimizing the sampling density of a wave-front sensor in adaptive optics systems: application to scanning laser ophthalmoscopy

Marie Laslandes, Matthias Salas, Christoph Hitzenberger, Michael Pircher

Proceedings Volume 10073, 1007318 (2017) https://doi.org/10.1117/12.2250732

KEYWORDS: Adaptive optics, Sensors, Scanning laser ophthalmoscopy, Retinal scanning, Actuators, Wavefront sensors, Aberration correction, Performance modeling, Eye, In vivo imaging, Deformable mirrors, Control systems, Diffraction

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Proceedings Article | 28 July 2014 Paper

Design, fabrication and testing of active carbon shell mirrors for space telescope applications

John Steeves, Marie Laslandes, Sergio Pellegrino, David Redding, Samuel Case Bradford, James Kent Wallace, Troy Barbee

Proceedings Volume 9151, 915105 (2014) https://doi.org/10.1117/12.2056560

KEYWORDS: Mirrors, Electrodes, Prototyping, Carbon, Space telescopes, Metrology, Actuators, Photovoltaics, Space mirrors, Epoxies

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Proceedings Article | 22 July 2014 Paper

Stress polishing demonstrator for ELT M1 segments and industrialization

Emmanuel Hugot, Anaïs Bernard, Marie Laslandes, Johan Floriot, Thibaut Dufour, Denis Fappani, Jean Marc Combes, Marc Ferrari

Proceedings Volume 9145, 914539 (2014) https://doi.org/10.1117/12.2055867

KEYWORDS: Polishing, Mirrors, Actuators, Optical testing, Optics manufacturing, Finite element methods, Telescopes, Monochromatic aberrations, Zerodur, Optical spheres

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Proceedings Article | 21 July 2014 Paper

Optimization of electrode configuration in surface-parallel actuated deformable mirrors

Marie Laslandes, Sergio Pellegrino, John Steeves, Keith Patterson

Proceedings Volume 9148, 914843 (2014) https://doi.org/10.1117/12.2056495

KEYWORDS: Actuators, Mirrors, Electrodes, Wavefronts, Deformable mirrors, Finite element methods, Monochromatic aberrations, Manufacturing, Carbon, Optimization (mathematics)

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SPIE Journal Paper | 30 April 2013 Open Access

Mirror actively deformed and regulated for applications in space: design and performance

Marie Laslandes, Emmanuel Hugot, Marc Ferrari, Claire Hourtoule, Celine Lopez, Frederic Chazallet

OE, Vol. 52, Issue 09, 091803, (April 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.9.091803

KEYWORDS: Mirrors, Actuators, Space telescopes, Space mirrors, Finite element methods, Wavefronts, Telescopes, Active optics, Precision calibration, Disk lasers

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Proceedings Article | 21 September 2012 Paper

Space active optics: performance of a deformable mirror for in-situ wave-front correction in space telescopes

Marie Laslandes, Claire Hourtoule, Emmanuel Hugot, Marc Ferrari, Céline Lopez, Christophe Devilliers, Arnaud Liotard, Frederic Chazallet

Proceedings Volume 8442, 844220 (2012) https://doi.org/10.1117/12.925135

KEYWORDS: Mirrors, Actuators, Space telescopes, Space mirrors, Active optics, Finite element methods, Telescopes, Deformable mirrors, Precision calibration, Astronomical imaging

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Proceedings Article | 13 September 2012 Paper

Active optics: deformation systems compensating for optical aberrations with a minimum number of actuators

Marie Laslandes, Emmanuel Hugot, Marc Ferrari

Proceedings Volume 8450, 84500J (2012) https://doi.org/10.1117/12.925611

KEYWORDS: Actuators, Monochromatic aberrations, Mirrors, Active optics, Finite element methods, Deformable mirrors, Optical aberrations, Space telescopes, Telescopes, Zernike polynomials

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Proceedings Article | 30 September 2011 Paper

Stress polishing of E-ELT segment at LAM: full-scale demonstrator status

Marie Laslandes, Nicolas Rousselet, Marc Ferrari, Emmanuel Hugot, Johan Floriot, Sébastien Vivès, Gérard Lemaitre, Jean François Carré, Marc Cayrel

Proceedings Volume 8169, 816903 (2011) https://doi.org/10.1117/12.896704

KEYWORDS: Polishing, Mirrors, Actuators, Prototyping, Spherical lenses, Telescopes, Ion beam finishing, Optics manufacturing, Monochromatic aberrations, Manufacturing

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Proceedings Article | 22 September 2011 Paper

Space Active Optics: toward optimized correcting mirrors for future large spaceborne observatories

Marie Laslandes, Emmanuel Hugot, Marc Ferrari, Gérard Lemaitre, Arnaud Liotard

Proceedings Volume 8167, 816713 (2011) https://doi.org/10.1117/12.896505

KEYWORDS: Actuators, Mirrors, Space telescopes, Deformable mirrors, Active optics, Finite element methods, Space mirrors, Optical aberrations, Monochromatic aberrations, Precision calibration

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Proceedings Article | 23 July 2010 Paper

In-flight aberrations corrections for large space telescopes using active optics

M. Laslandes, M. Ferrari, E. Hugot, G. Lemaitre

Proceedings Volume 7739, 77393A (2010) https://doi.org/10.1117/12.856015

KEYWORDS: Mirrors, Actuators, Space telescopes, Active optics, Deformable mirrors, Finite element methods, Space mirrors, Optical aberrations, Zernike polynomials, Precision calibration

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Proceedings Article | 19 July 2010 Paper

On the super polishing under stress of aspherical surfaces for exoplanet detection and solar instruments

Emmanuel Hugot, Marc Ferrari, Sébastien Vives, Marie Laslandes, Kacem El Hadi, Sébastien Moindrot, Gérard Lemaitre, Kjetil Dohlen

Proceedings Volume 7739, 77390F (2010) https://doi.org/10.1117/12.855986

KEYWORDS: Polishing, Mirrors, Surface finishing, Aspheric lenses, Optical spheres, Adaptive optics, Finite element methods, Spatial frequencies, Coronagraphy, Optics manufacturing

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Showing 5 of 17 publications

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