Prof. Christophe Collette Profile

Prof. Christophe Collette

at Univ Libre de Bruxelles

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Author

Publications (6)

Proceedings Article | 31 May 2023 Presentation + Paper

Bragg grating manufacturing in planar silica substrates

M. Tunon de Lara, K. Chah, L. Amez-Droz, P. Lambert, C. Collette, C. Caucheteur

Proceedings Volume 12572, 125720X (2023) https://doi.org/10.1117/12.2665471

KEYWORDS: Bragg gratings, Waveguides, Femtosecond phenomena, Silica, Glasses, Femtosecond pulse shaping, Optical fibers, Manufacturing, Refractive index, Objectives

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Proceedings Article | 23 May 2023 Paper

Femtosecond laser micro/nano-machining of silica glass planar substrates for the production of Bragg gratings

M. Tunon de Lara, K. Chah, L. Amez-Droz, P. Lambert, C. Collette, C. Caucheteur

Proceedings Volume 12643, 126433D (2023) https://doi.org/10.1117/12.2678419

KEYWORDS: Bragg gratings, Waveguides, Femtosecond phenomena, Silica, Glasses, Refractive index, Femtosecond pulse shaping, Optical fibers, Optical transmission, Reflection

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Proceedings Article | 25 May 2022 Poster + Paper

Production of optical waveguide in planar glass substrate fabricated with femtoprint

M. Tunon de Lara, K. Chah, L. Amez-Droz, P. Lambert, C. Collette, C. Caucheteur

Proceedings Volume 12142, 121421K (2022) https://doi.org/10.1117/12.2625304

KEYWORDS: Waveguides, Glasses, Refractive index, Femtosecond phenomena, Microscopes, Silica, Etching, Connectors, Optical fibers, Single mode fibers

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SPIE Journal Paper | 11 February 2020

Dynamic stabilization of thin aperture light collector space telescope using active rods

Mohit Verma, Adrien Pece, Sylvain Hellegouarch, Jennifer Watchi, Gilles Durand, Simon Chesné, Christophe Collette

JATIS, Vol. 6, Issue 01, 014002, (February 2020) https://doi.org/10.1117/12.10.1117/1.JATIS.6.1.014002

KEYWORDS: Talc, Mirrors, Space telescopes, Actuators, Telescopes, Segmented mirrors, Solid modeling, Transducers, Control systems, James Webb Space Telescope

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Proceedings Article | 25 September 2017 Open Access

Talc a far-infrared 20m space telescope and the ELICSIR consortium to reach TRL 3

G. Durand, J. Amiaux, M. Sauvage, T. Martens, J. Austin, S. Chesne, C. Collette, J. Pareschi, Y. Penfornis, G. Valsecchi, U. Wittrock

Proceedings Volume 10562, 105623R (2017) https://doi.org/10.1117/12.2296208

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Proceedings Article | 29 July 2016 Paper

A development roadmap for critical technologies needed for TALC: a deployable 20m annular space telescope

Marc Sauvage, Jérome Amiaux, James Austin, Mara Bello, Giovanni Bianucci, Simon Chesné, Oberto Citterio, Christophe Collette, Sébastien Correia, Gilles Durand, Sergio Molinari, Giovanni Pareschi, Yann Penfornis, Giorgia Sironi, Giuseppe Valsecchi, Sven Verpoort, Ulrich Wittrock

Proceedings Volume 9904, 99041L (2016) https://doi.org/10.1117/12.2231867

KEYWORDS: Space telescopes, Mirrors, Telescopes, Active optics, Space telescopes, Telescopes, Active optics, Talc, Carbon, Astronomy, Manufacturing, Nickel, Optics manufacturing

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Astronomy is driven by the quest for higher sensitivity and improved angular resolution in order to detect fainter or smaller objects. The far-infrared to submillimeter domain is a unique probe of the cold and obscured Universe, harboring for instance the precious signatures of key elements such as water. Space observations are mandatory given the blocking effect of our atmosphere. However the methods we have relied on so far to develop increasingly larger telescopes are now reaching a hard limit, with the JWST illustrating this in more than one way (e.g. it will be launched by one of the most powerful rocket, it requires the largest existing facility on Earth to be qualified). With the Thinned Aperture Light Collector (TALC) project, a concept of a deployable 20 m annular telescope, we propose to break out of this deadlock by developing novel technologies for space telescopes, which are disruptive in three aspects: • An innovative deployable mirror whose topology, based on stacking rather than folding, leads to an optimum ratio of collecting area over volume, and creates a telescope with an eight times larger collecting area and three times higher angular resolution compared to JWST from the same pre-deployed volume; • An ultra-light weight segmented primary mirror, based on electrodeposited Nickel, Composite and Honeycomb stacks, built with a replica process to control costs and mitigate the industrial risks; • An active optics control layer based on piezo-electric layers incorporated into the mirror rear shell allowing control of the shape by internal stress rather than by reaction on a structure. We present in this paper the roadmap we have built to bring these three disruptive technologies to technology readiness level 3. We will achieve this goal through design and realization of representative elements: segments of mirrors for optical quality verification, active optics implemented on representative mirror stacks to characterize the shape correction capabilities, and mechanical models for validation of the deployment concept. Accompanying these developments, a strong system activity will ensure that the ultimate goal of having an integrated system can be met, especially in terms of (a) scalability toward a larger structure, and (b) verification philosophy.

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